Tomer Zidki - Profile on Academia.edu (original) (raw)
Papers by Tomer Zidki
Can ultraviolet-assisted advanced reduction processes effectively destroy per- and polyfluoroalkyl substances in real water matrices?
Current Opinion in Chemical Engineering, Nov 30, 2023
Angewandte Chemie, Nov 15, 2018
The nature of H-atoms adsorbed on M°-nanoparticles is of major importance in many catalyzed reduc... more The nature of H-atoms adsorbed on M°-nanoparticles is of major importance in many catalyzed reduction processes. Using isotope labeling, we determined that hydrogen evolution from transient {(M°-NP)-Hn} n-proceeds mainly via the Heyrovsky mechanism when n is large (i.e., the hydrogens behave as hydrides) but mainly via the Tafel mechanism when n is small (i.e., the hydrogens behave as atoms). Additionally, the relative contributions of the two mechanisms differ considerably when M = Au & Ag. The results are analogous to those recently reported for the M°-NPcatalyzed de-halogenation processes. Scheme 1. A simplified schematic of reactions (3)-(5)
New insights into HER catalysis: the effect of nano-silica support on catalysis by silver nanoparticles
Physical Chemistry Chemical Physics, 2020
Nano-silica support affects the activity of silver nanoparticles towards the hydrogen evolution r... more Nano-silica support affects the activity of silver nanoparticles towards the hydrogen evolution reaction by (CH3)2COH˙ radicals.
Angewandte Chemie, Nov 15, 2018
The nature of H-atoms adsorbed on M°-nanoparticles is of major importance in many catalyzed reduc... more The nature of H-atoms adsorbed on M°-nanoparticles is of major importance in many catalyzed reduction processes. Using isotope labeling, we determined that hydrogen evolution from transient {(M°-NP)-Hn} nproceeds mainly via the Heyrovsky mechanism when n is large (i.e., the hydrogens behave as hydrides) but mainly via the Tafel mechanism when n is small (i.e., the hydrogens behave as atoms). Additionally, the relative contributions of the two mechanisms differ considerably when M = Au & Ag. The results are analogous to those recently reported for the M°-NPcatalyzed de-halogenation processes. Scheme 1. A simplified schematic of reactions (3)-(5)
Materials Research Bulletin, Jun 1, 2020
Due to size-dependent catalytic selectivity, the size and special morphology are of great importa... more Due to size-dependent catalytic selectivity, the size and special morphology are of great importance to applications of TiO 2 . The synthesis method of size and morphology control has been in need of innovation. In this study, TiO 2 nanoparticles(TiO 2 -NPs) with well-defined morphology and homogenous size were synthesized using a novel method, in which bamboo substrate, dielectrophoresis (DEP) technology and a sol-gel process were combined(substrate/ DEP/ sol-gel). Powder X-ray diffraction (XRD) and scanning electron microscopy (SEM) techniques were used to characterize the TiO 2 -NPs. Further study showed that, with this combined method, the size and the uniformity of TiO 2 -NPs can be controlled by changing the voltage of DEP. The number and arrangement of TiO 2 nanorods can be controlled by changing the voltage. Substrate/ DEP/ sol-gel proved to be an efficient way to form special morphologies of TiO 2 -NPs. A visible-light catalytic activity experiment showed that among three preparation methods, the substrate/ DEP/ solgel method made TiO 2 -NPs with the highest catalytic activity for degradation of methyl orange. TiO 2 -NPs produced by the DEP/ sol-gel process presented higher catalytic activity than TiO 2 -NPs produced by only a sol-gel process.
Research Square (Research Square), Sep 6, 2022
Among methods employed for carbon capture, electroreduction of CO 2 offers not only reducing CO 2... more Among methods employed for carbon capture, electroreduction of CO 2 offers not only reducing CO 2 levels but also the possibility of recycling it into commodity chemicals. However, the most e cient catalysts for this reaction are precious metals. In order to achieve cost-effective processes, other elements should be used. Transition-metal atoms coordinated in metal-organic frameworks (MOFs) exhibit high performance as electrocatalysts. However, the isolating nature of MOFs limits their utilization as electrocatalysts. In this study, we have grown MOF nanoparticles inside hierarchically meso-porous carbon instead of mixing the MOFs with conducting carbons. The incorporated MOF nanoparticles show improved properties than MOFs mixed with carbon, proving the strong electronic interactions in the composites. The encapsulated MOF nanoparticles demonstrate high electric conductivity while preserving their original crystallinity. When used as electrodes in CO 2 electroreduction, the MOFs provide high electroactive coverage of 155 nmol cm - 2 . Moreover, in CO 2 saturated electrolyte, the composites exhibit excellent electrochemical performance, including a small onset potential (-0.31 V vs. RHE) and large reduction currents (-18 mA• cm - 2 at -1.0 V), considerably higher than usually reported for MOFbased beyond CO electroreduction. Importantly, the composite is able to produce valuable hydrogenated chemical commodities, including formic acid.
Electrocatalytic and Photoelectrocatalytic Methanol Oxidation by Cobalt Carbonate
ACS applied energy materials, Sep 26, 2022
Green Synthesis of M 0 Nanoparticles (M=Pd, Pt, and Ru) for Electrocatalytic Hydrogen Evolution
Israel Journal of Chemistry, Feb 26, 2020
In recent years the demand for green synthesis and green energy has increased immensely. Herein M... more In recent years the demand for green synthesis and green energy has increased immensely. Herein M0 nanoparticles were synthesized using a metal precursor and NaHCO3 under hydrothermal conditions without using any reducing agent. The nanoparticles were characterized using powder X‐ray diffraction (PXRD), scanning electron microscopy (SEM), and energy dispersive X‐ray analysis (EDX). Surprisingly, it found that the Pt and Pd nanoparticles contain a high concentration of carbon. The presence of carbon is also evident from the attenuated transmission resonance infra‐red (ATRIR) spectroscopy. Moreover, acetic acid was detected as a byproduct of the hydrothermal reaction. NaHCO3 can be considered as the dissolution of CO2 in a mildly alkaline solution. Thus, during the reaction, CO2 was converted to carbonaceous material, which can be considered as a fixation of CO2. The synthesized nanoparticles are also efficient catalysts for the electrocatalytic hydrogen evolution reaction (HER). It was found that Ru nanoparticles exhibit the highest activity among the three catalysts studied.
Electrochemical Active MOF Nanoparticles/Carbon Composite for the Electroreduction of CO2 into Valuable Chemicals
Meeting abstracts, Oct 19, 2021
On the Remarkable Performance of Silver‐based Alloy Nanoparticles in 4‐Nitrophenol Catalytic Reduction
Chemcatchem, Aug 5, 2020
Elimination of nitro groups from the toxic aromatic nitro compounds is of great environmental imp... more Elimination of nitro groups from the toxic aromatic nitro compounds is of great environmental importance. A catalytic study of the 4‐nitrophenol reduction on the surface of metallic and alloy nanoparticles is presented. The silver‐based catalysts, with low amounts of platinum (10 % Pt), exhibit excellent catalytic activity without an induction‐time, which fulfills both the performance and cost requirements for the catalytic reduction of 4‐nitrophenol to 4‐aminophenol in the presence of NaBH4. The apparent rate constant of 59×10−3 s−1 and an extremely high activity parameter value of 13,600 s−1 g−1 are reported for the first time. This mechanistic study suggests that hydrides are the active species for 4‐nitrophenol reduction, and that the composition of the alloy can affect the reactivity and competition with the hydrogen evolution reaction. Our work opens future possibilities for the optimal design of efficient and low‐cost catalysts for redox processes and neutralization of organic pollutants.
Journal of Coordination Chemistry, Jul 3, 2018
Stored electrons on Au and Ag nanoparticles (NPs) have been found to catalyze various reduction p... more Stored electrons on Au and Ag nanoparticles (NPs) have been found to catalyze various reduction processes initiated by ionizing irradiation or light illumination in which the NPs act as "nanoelectrodes". In the present study, we explored the effect of charging colloidal gold and silver NPs on their reaction with methyl radicals, ÁCH 3. The results show that charging the colloidal metal NPs by excess of electrons, (NP) nÀ , affected their reaction mechanism with methyl radicals and resulted in different product composition in comparison to the analogous reactions with uncharged particles. These results should be considered in photo(electro)catalytic processes when alkyl radicals are formed near the catalyst surface.
Manganese Carbonate (Mn2(CO3)3) as an Efficient, Stable Heterogeneous Electrocatalyst for the Oxygen Evolution Reaction
ACS applied energy materials, Nov 7, 2022
Silica Support Affects the Catalytic Hydrogen Evolution by Silver
European Journal of Inorganic Chemistry, Jul 28, 2021
Silica supported silver nanoparticles, SiO2‐Ag0‐NPs, catalyze the hydrolysis of BH4−. A compariso... more Silica supported silver nanoparticles, SiO2‐Ag0‐NPs, catalyze the hydrolysis of BH4−. A comparison of the isotopic composition of the hydrogen formed in the hydrolysis of BD4− points out that the contribution of hydrides, the Heyrovsky mechanism, rather than that of hydrogen atoms, the Tafel mechanism, to the hydrogen evolution is considerably larger for the SiO2‐Ag0‐NPs catalyzed process than for the Ag0‐NPs catalyzed process. This indicates some electron transfer from the SiO2 to the silver that increases the negative charge on the Ag0‐NPs.
Anchoring MoS2 on an ethanol-etched Prussian blue analog for enhanced electrocatalytic efficiency for the oxygen evolution reaction
Materials Chemistry Frontiers
Ethanol–water etched Prussian blue analog nanocages decorated with molybdenum disulfide nanoflowe... more Ethanol–water etched Prussian blue analog nanocages decorated with molybdenum disulfide nanoflowers exhibit remarkable electrocatalytic activity toward the OER. The catalyst delivers an excellent OER activity with an overpotential of only 260 mV to obtain a current density of 10 mA cm−2.
Radiation Physics and Chemistry, Jul 1, 2016
Silica supported silver NPs are efficient catalysts for dimerization of methyl radicals. Bare sil... more Silica supported silver NPs are efficient catalysts for dimerization of methyl radicals. Bare silica is inert towards the interaction with methyl radicals. Ethanol adsorbed on the SiO 2 surface changes the reaction path with ÁCH 3. Adsorbed ethanol on the well-known Stöber silica prevents its precipitation.
Electrochemical degradation of per- and poly-fluoroalkyl substances in the presence of natural organic matter
Separation and Purification Technology
Compositing redox-rich Co–Co@Ni–Fe PBA nanocubes into cauliflower-like conducting polypyrrole as an electrode material in supercapacitors
Materials Chemistry Frontiers
Supercapacitors (SCs) coupled with redox materials have been extensively investigated to maximize... more Supercapacitors (SCs) coupled with redox materials have been extensively investigated to maximize the energy density of SCs.
Catalysts
Sulfur and nitrogen oxides (SOX/NOX) are the primary air toxic gas pollutants emitted during fuel... more Sulfur and nitrogen oxides (SOX/NOX) are the primary air toxic gas pollutants emitted during fuel combustion, causing health and environmental concerns. Therefore, their emission in flue gases is strictly regulated. The existing technologies used to decrease SOX/NOX content are flue gas desulfurization, which necessitates high capital and operating costs, and selective catalytic reduction, which, in addition to these costs, requires expensive catalysts and high operating temperatures (350–400 °C). New wet scrubbing processes use O3 or H2O2 oxidants to produce (NH4)2SO4 and NH4NO3 fertilizers upon ammonia injection. However, these oxidants are expensive, corrosive, and hazardous. SiO2/Co(OH)2 nanocomposites are presented here as potential catalysts for SOX/NOX oxidation in wet scrubber reactors to scrub these toxic gases using atmospheric oxygen as the oxidant at relatively low temperatures of 60–90 °C. Several silica-cobalt-oxide-based nanocomposites were synthesized as potential ca...
Enhancing the catalytic OER performance of MoS2 via Fe and Co doping
Nanoscale
Co-doping MoS2 nanosheets with Fe and Co atoms induces electronic and structural modifications th... more Co-doping MoS2 nanosheets with Fe and Co atoms induces electronic and structural modifications that enhance the sluggish OER activity of the MoS2 catalyst.
Manganese Carbonate (Mn2(CO3)3) as an Efficient, Stable Heterogeneous Electrocatalyst for the Oxygen Evolution Reaction
Can ultraviolet-assisted advanced reduction processes effectively destroy per- and polyfluoroalkyl substances in real water matrices?
Current Opinion in Chemical Engineering, Nov 30, 2023
Angewandte Chemie, Nov 15, 2018
The nature of H-atoms adsorbed on M°-nanoparticles is of major importance in many catalyzed reduc... more The nature of H-atoms adsorbed on M°-nanoparticles is of major importance in many catalyzed reduction processes. Using isotope labeling, we determined that hydrogen evolution from transient {(M°-NP)-Hn} n-proceeds mainly via the Heyrovsky mechanism when n is large (i.e., the hydrogens behave as hydrides) but mainly via the Tafel mechanism when n is small (i.e., the hydrogens behave as atoms). Additionally, the relative contributions of the two mechanisms differ considerably when M = Au & Ag. The results are analogous to those recently reported for the M°-NPcatalyzed de-halogenation processes. Scheme 1. A simplified schematic of reactions (3)-(5)
New insights into HER catalysis: the effect of nano-silica support on catalysis by silver nanoparticles
Physical Chemistry Chemical Physics, 2020
Nano-silica support affects the activity of silver nanoparticles towards the hydrogen evolution r... more Nano-silica support affects the activity of silver nanoparticles towards the hydrogen evolution reaction by (CH3)2COH˙ radicals.
Angewandte Chemie, Nov 15, 2018
The nature of H-atoms adsorbed on M°-nanoparticles is of major importance in many catalyzed reduc... more The nature of H-atoms adsorbed on M°-nanoparticles is of major importance in many catalyzed reduction processes. Using isotope labeling, we determined that hydrogen evolution from transient {(M°-NP)-Hn} nproceeds mainly via the Heyrovsky mechanism when n is large (i.e., the hydrogens behave as hydrides) but mainly via the Tafel mechanism when n is small (i.e., the hydrogens behave as atoms). Additionally, the relative contributions of the two mechanisms differ considerably when M = Au & Ag. The results are analogous to those recently reported for the M°-NPcatalyzed de-halogenation processes. Scheme 1. A simplified schematic of reactions (3)-(5)
Materials Research Bulletin, Jun 1, 2020
Due to size-dependent catalytic selectivity, the size and special morphology are of great importa... more Due to size-dependent catalytic selectivity, the size and special morphology are of great importance to applications of TiO 2 . The synthesis method of size and morphology control has been in need of innovation. In this study, TiO 2 nanoparticles(TiO 2 -NPs) with well-defined morphology and homogenous size were synthesized using a novel method, in which bamboo substrate, dielectrophoresis (DEP) technology and a sol-gel process were combined(substrate/ DEP/ sol-gel). Powder X-ray diffraction (XRD) and scanning electron microscopy (SEM) techniques were used to characterize the TiO 2 -NPs. Further study showed that, with this combined method, the size and the uniformity of TiO 2 -NPs can be controlled by changing the voltage of DEP. The number and arrangement of TiO 2 nanorods can be controlled by changing the voltage. Substrate/ DEP/ sol-gel proved to be an efficient way to form special morphologies of TiO 2 -NPs. A visible-light catalytic activity experiment showed that among three preparation methods, the substrate/ DEP/ solgel method made TiO 2 -NPs with the highest catalytic activity for degradation of methyl orange. TiO 2 -NPs produced by the DEP/ sol-gel process presented higher catalytic activity than TiO 2 -NPs produced by only a sol-gel process.
Research Square (Research Square), Sep 6, 2022
Among methods employed for carbon capture, electroreduction of CO 2 offers not only reducing CO 2... more Among methods employed for carbon capture, electroreduction of CO 2 offers not only reducing CO 2 levels but also the possibility of recycling it into commodity chemicals. However, the most e cient catalysts for this reaction are precious metals. In order to achieve cost-effective processes, other elements should be used. Transition-metal atoms coordinated in metal-organic frameworks (MOFs) exhibit high performance as electrocatalysts. However, the isolating nature of MOFs limits their utilization as electrocatalysts. In this study, we have grown MOF nanoparticles inside hierarchically meso-porous carbon instead of mixing the MOFs with conducting carbons. The incorporated MOF nanoparticles show improved properties than MOFs mixed with carbon, proving the strong electronic interactions in the composites. The encapsulated MOF nanoparticles demonstrate high electric conductivity while preserving their original crystallinity. When used as electrodes in CO 2 electroreduction, the MOFs provide high electroactive coverage of 155 nmol cm - 2 . Moreover, in CO 2 saturated electrolyte, the composites exhibit excellent electrochemical performance, including a small onset potential (-0.31 V vs. RHE) and large reduction currents (-18 mA• cm - 2 at -1.0 V), considerably higher than usually reported for MOFbased beyond CO electroreduction. Importantly, the composite is able to produce valuable hydrogenated chemical commodities, including formic acid.
Electrocatalytic and Photoelectrocatalytic Methanol Oxidation by Cobalt Carbonate
ACS applied energy materials, Sep 26, 2022
Green Synthesis of M 0 Nanoparticles (M=Pd, Pt, and Ru) for Electrocatalytic Hydrogen Evolution
Israel Journal of Chemistry, Feb 26, 2020
In recent years the demand for green synthesis and green energy has increased immensely. Herein M... more In recent years the demand for green synthesis and green energy has increased immensely. Herein M0 nanoparticles were synthesized using a metal precursor and NaHCO3 under hydrothermal conditions without using any reducing agent. The nanoparticles were characterized using powder X‐ray diffraction (PXRD), scanning electron microscopy (SEM), and energy dispersive X‐ray analysis (EDX). Surprisingly, it found that the Pt and Pd nanoparticles contain a high concentration of carbon. The presence of carbon is also evident from the attenuated transmission resonance infra‐red (ATRIR) spectroscopy. Moreover, acetic acid was detected as a byproduct of the hydrothermal reaction. NaHCO3 can be considered as the dissolution of CO2 in a mildly alkaline solution. Thus, during the reaction, CO2 was converted to carbonaceous material, which can be considered as a fixation of CO2. The synthesized nanoparticles are also efficient catalysts for the electrocatalytic hydrogen evolution reaction (HER). It was found that Ru nanoparticles exhibit the highest activity among the three catalysts studied.
Electrochemical Active MOF Nanoparticles/Carbon Composite for the Electroreduction of CO2 into Valuable Chemicals
Meeting abstracts, Oct 19, 2021
On the Remarkable Performance of Silver‐based Alloy Nanoparticles in 4‐Nitrophenol Catalytic Reduction
Chemcatchem, Aug 5, 2020
Elimination of nitro groups from the toxic aromatic nitro compounds is of great environmental imp... more Elimination of nitro groups from the toxic aromatic nitro compounds is of great environmental importance. A catalytic study of the 4‐nitrophenol reduction on the surface of metallic and alloy nanoparticles is presented. The silver‐based catalysts, with low amounts of platinum (10 % Pt), exhibit excellent catalytic activity without an induction‐time, which fulfills both the performance and cost requirements for the catalytic reduction of 4‐nitrophenol to 4‐aminophenol in the presence of NaBH4. The apparent rate constant of 59×10−3 s−1 and an extremely high activity parameter value of 13,600 s−1 g−1 are reported for the first time. This mechanistic study suggests that hydrides are the active species for 4‐nitrophenol reduction, and that the composition of the alloy can affect the reactivity and competition with the hydrogen evolution reaction. Our work opens future possibilities for the optimal design of efficient and low‐cost catalysts for redox processes and neutralization of organic pollutants.
Journal of Coordination Chemistry, Jul 3, 2018
Stored electrons on Au and Ag nanoparticles (NPs) have been found to catalyze various reduction p... more Stored electrons on Au and Ag nanoparticles (NPs) have been found to catalyze various reduction processes initiated by ionizing irradiation or light illumination in which the NPs act as "nanoelectrodes". In the present study, we explored the effect of charging colloidal gold and silver NPs on their reaction with methyl radicals, ÁCH 3. The results show that charging the colloidal metal NPs by excess of electrons, (NP) nÀ , affected their reaction mechanism with methyl radicals and resulted in different product composition in comparison to the analogous reactions with uncharged particles. These results should be considered in photo(electro)catalytic processes when alkyl radicals are formed near the catalyst surface.
Manganese Carbonate (Mn2(CO3)3) as an Efficient, Stable Heterogeneous Electrocatalyst for the Oxygen Evolution Reaction
ACS applied energy materials, Nov 7, 2022
Silica Support Affects the Catalytic Hydrogen Evolution by Silver
European Journal of Inorganic Chemistry, Jul 28, 2021
Silica supported silver nanoparticles, SiO2‐Ag0‐NPs, catalyze the hydrolysis of BH4−. A compariso... more Silica supported silver nanoparticles, SiO2‐Ag0‐NPs, catalyze the hydrolysis of BH4−. A comparison of the isotopic composition of the hydrogen formed in the hydrolysis of BD4− points out that the contribution of hydrides, the Heyrovsky mechanism, rather than that of hydrogen atoms, the Tafel mechanism, to the hydrogen evolution is considerably larger for the SiO2‐Ag0‐NPs catalyzed process than for the Ag0‐NPs catalyzed process. This indicates some electron transfer from the SiO2 to the silver that increases the negative charge on the Ag0‐NPs.
Anchoring MoS2 on an ethanol-etched Prussian blue analog for enhanced electrocatalytic efficiency for the oxygen evolution reaction
Materials Chemistry Frontiers
Ethanol–water etched Prussian blue analog nanocages decorated with molybdenum disulfide nanoflowe... more Ethanol–water etched Prussian blue analog nanocages decorated with molybdenum disulfide nanoflowers exhibit remarkable electrocatalytic activity toward the OER. The catalyst delivers an excellent OER activity with an overpotential of only 260 mV to obtain a current density of 10 mA cm−2.
Radiation Physics and Chemistry, Jul 1, 2016
Silica supported silver NPs are efficient catalysts for dimerization of methyl radicals. Bare sil... more Silica supported silver NPs are efficient catalysts for dimerization of methyl radicals. Bare silica is inert towards the interaction with methyl radicals. Ethanol adsorbed on the SiO 2 surface changes the reaction path with ÁCH 3. Adsorbed ethanol on the well-known Stöber silica prevents its precipitation.
Electrochemical degradation of per- and poly-fluoroalkyl substances in the presence of natural organic matter
Separation and Purification Technology
Compositing redox-rich Co–Co@Ni–Fe PBA nanocubes into cauliflower-like conducting polypyrrole as an electrode material in supercapacitors
Materials Chemistry Frontiers
Supercapacitors (SCs) coupled with redox materials have been extensively investigated to maximize... more Supercapacitors (SCs) coupled with redox materials have been extensively investigated to maximize the energy density of SCs.
Catalysts
Sulfur and nitrogen oxides (SOX/NOX) are the primary air toxic gas pollutants emitted during fuel... more Sulfur and nitrogen oxides (SOX/NOX) are the primary air toxic gas pollutants emitted during fuel combustion, causing health and environmental concerns. Therefore, their emission in flue gases is strictly regulated. The existing technologies used to decrease SOX/NOX content are flue gas desulfurization, which necessitates high capital and operating costs, and selective catalytic reduction, which, in addition to these costs, requires expensive catalysts and high operating temperatures (350–400 °C). New wet scrubbing processes use O3 or H2O2 oxidants to produce (NH4)2SO4 and NH4NO3 fertilizers upon ammonia injection. However, these oxidants are expensive, corrosive, and hazardous. SiO2/Co(OH)2 nanocomposites are presented here as potential catalysts for SOX/NOX oxidation in wet scrubber reactors to scrub these toxic gases using atmospheric oxygen as the oxidant at relatively low temperatures of 60–90 °C. Several silica-cobalt-oxide-based nanocomposites were synthesized as potential ca...
Enhancing the catalytic OER performance of MoS2 via Fe and Co doping
Nanoscale
Co-doping MoS2 nanosheets with Fe and Co atoms induces electronic and structural modifications th... more Co-doping MoS2 nanosheets with Fe and Co atoms induces electronic and structural modifications that enhance the sluggish OER activity of the MoS2 catalyst.
Manganese Carbonate (Mn2(CO3)3) as an Efficient, Stable Heterogeneous Electrocatalyst for the Oxygen Evolution Reaction