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Papers by Muhammad Abdelhamid

Research paper thumbnail of Advanced and Emerging Negative Electrodes for Li-Ion Capacitors: Pragmatism vs. Performance

Energies, 2021

Li-ion capacitors (LICs) are designed to achieve high power and energy densities using a carbon-b... more Li-ion capacitors (LICs) are designed to achieve high power and energy densities using a carbon-based material as a positive electrode coupled with a negative electrode often adopted from Li-ion batteries. However, such adoption cannot be direct and requires additional materials optimization. Furthermore, for the desired device’s performance, a proper design of the electrodes is necessary to balance the different charge storage mechanisms. The negative electrode with an intercalation or alloying active material must provide the high rate performance and long-term cycling ability necessary for LIC functionality—a primary challenge for the design of these energy-storage devices. In addition, the search for new active materials must also consider the need for environmentally friendly chemistry and the sustainable availability of key elements. With these factors in mind, this review evaluates advanced and emerging materials used as high-rate anodes in LICs from the perspective of their ...

Research paper thumbnail of Charge storage mechanism of α-MnO2 in protic and aprotic ionic liquid electrolytes

Journal of Power Sources, 2020

 Users may download and print one copy of any publication from the public portal for the purpose... more  Users may download and print one copy of any publication from the public portal for the purpose of private study or research.  You may not further distribute the material or use it for any profit-making activity or commercial gain  You may freely distribute the URL identifying the publication in the public portal If you believe that this document breaches copyright please contact us providing details, and we will remove access to the work immediately and investigate your claim.

Research paper thumbnail of Water-in-Bisalt Electrolyte with Record Salt Concentration and Widened Electrochemical Stability Window

The Journal of Physical Chemistry Letters, 2019

Research paper thumbnail of Concept and electrochemical mechanism of an Al metal anode ‒ organic cathode battery

Energy Storage Materials, 2019

Research paper thumbnail of A free-standing reduced graphene oxide aerogel as supporting electrode in a fluorine-free Li2S8 catholyte Li-S battery

Journal of Power Sources, 2019

• New synthetic route for free-standing reduced graphene oxide aerogel. • Semi-liquid Li-S cells ... more • New synthetic route for free-standing reduced graphene oxide aerogel. • Semi-liquid Li-S cells designed through fluorine-free electrolyte medium. • Reduced graphene oxide aerogel stabilizing Li-S cells cyclability and capacity retention.

Research paper thumbnail of Solvent-free lithium and sodium containing electrolytes based on pseudo-delocalized anions

Chemical Communications, 2018

Synthesis and characterisation of super-cooled solvent-free liquid electrolytes for Li and Na bat... more Synthesis and characterisation of super-cooled solvent-free liquid electrolytes for Li and Na batteries.

Research paper thumbnail of On the Feasibility of Sodium Metal as Pseudo-Reference Electrode in Solid State Electrochemical Cells

ChemElectroChem, 2017

A setup of a sodium metal anode vs. a solid polymer electrolyte (SPE) comprising poly(ethylene ox... more A setup of a sodium metal anode vs. a solid polymer electrolyte (SPE) comprising poly(ethylene oxide) (PEO) and sodium bis(trifluoromethanesulfonyl)imide (NaTFSI) has been evaluated in detail for the feasibility to use sodium metal as a pseudoreference electrode (pseudo-RE). To evaluate the stability and reproducibility, we monitored the half-wave potential (E1/2) of added decamethylferrocene (Me10Fc) and the stability of the interface by electrochemical impedance spectroscopy (EIS). The sodium/SPE interface resistance (RNa/SPE) increases with time, up to 2.8 kΩ cm-2 , and causes the E1/2 of the Me10Fc +/reference redox couple to drift up to 15 mV during 88 hours. Moreover, the sodium potential is very irreproducible, even initially after cell assembling the values can differ by 60 mV, likely due to extreme sensitivity of the metal surface even to an "inert and dry" glove box environment. Indeed, freshly cut sodium readily reacts with water, forming NaOH, and adsorbs impurities that can be present even in a glove box atmosphere. The oxidation layer and the amount of adsorbed impurities increase with the exposure to the glove box atmosphere, as revealed by ATR-FTIR spectroscopy. Altogether, this calls for attention when evaluating any battery materials in half-cell configurations using sodium metal as the pseudo-RE.

Research paper thumbnail of Storing energy in plastics: a review on conducting polymers & their role in electrochemical energy storage

RSC Advances, 2015

This review article on conducting polymers discusses the background & theory behind their conduct... more This review article on conducting polymers discusses the background & theory behind their conductivity, the methods to nano-engineer special morphologies & recent contributions to the field of energy (e.g.supercapacitors, batteries and fuel cells).

Research paper thumbnail of Advanced and Emerging Negative Electrodes for Li-Ion Capacitors: Pragmatism vs. Performance

Energies, 2021

Li-ion capacitors (LICs) are designed to achieve high power and energy densities using a carbon-b... more Li-ion capacitors (LICs) are designed to achieve high power and energy densities using a carbon-based material as a positive electrode coupled with a negative electrode often adopted from Li-ion batteries. However, such adoption cannot be direct and requires additional materials optimization. Furthermore, for the desired device’s performance, a proper design of the electrodes is necessary to balance the different charge storage mechanisms. The negative electrode with an intercalation or alloying active material must provide the high rate performance and long-term cycling ability necessary for LIC functionality—a primary challenge for the design of these energy-storage devices. In addition, the search for new active materials must also consider the need for environmentally friendly chemistry and the sustainable availability of key elements. With these factors in mind, this review evaluates advanced and emerging materials used as high-rate anodes in LICs from the perspective of their ...

Research paper thumbnail of Charge storage mechanism of α-MnO2 in protic and aprotic ionic liquid electrolytes

Journal of Power Sources, 2020

 Users may download and print one copy of any publication from the public portal for the purpose... more  Users may download and print one copy of any publication from the public portal for the purpose of private study or research.  You may not further distribute the material or use it for any profit-making activity or commercial gain  You may freely distribute the URL identifying the publication in the public portal If you believe that this document breaches copyright please contact us providing details, and we will remove access to the work immediately and investigate your claim.

Research paper thumbnail of Water-in-Bisalt Electrolyte with Record Salt Concentration and Widened Electrochemical Stability Window

The Journal of Physical Chemistry Letters, 2019

Research paper thumbnail of Concept and electrochemical mechanism of an Al metal anode ‒ organic cathode battery

Energy Storage Materials, 2019

Research paper thumbnail of A free-standing reduced graphene oxide aerogel as supporting electrode in a fluorine-free Li2S8 catholyte Li-S battery

Journal of Power Sources, 2019

• New synthetic route for free-standing reduced graphene oxide aerogel. • Semi-liquid Li-S cells ... more • New synthetic route for free-standing reduced graphene oxide aerogel. • Semi-liquid Li-S cells designed through fluorine-free electrolyte medium. • Reduced graphene oxide aerogel stabilizing Li-S cells cyclability and capacity retention.

Research paper thumbnail of Solvent-free lithium and sodium containing electrolytes based on pseudo-delocalized anions

Chemical Communications, 2018

Synthesis and characterisation of super-cooled solvent-free liquid electrolytes for Li and Na bat... more Synthesis and characterisation of super-cooled solvent-free liquid electrolytes for Li and Na batteries.

Research paper thumbnail of On the Feasibility of Sodium Metal as Pseudo-Reference Electrode in Solid State Electrochemical Cells

ChemElectroChem, 2017

A setup of a sodium metal anode vs. a solid polymer electrolyte (SPE) comprising poly(ethylene ox... more A setup of a sodium metal anode vs. a solid polymer electrolyte (SPE) comprising poly(ethylene oxide) (PEO) and sodium bis(trifluoromethanesulfonyl)imide (NaTFSI) has been evaluated in detail for the feasibility to use sodium metal as a pseudoreference electrode (pseudo-RE). To evaluate the stability and reproducibility, we monitored the half-wave potential (E1/2) of added decamethylferrocene (Me10Fc) and the stability of the interface by electrochemical impedance spectroscopy (EIS). The sodium/SPE interface resistance (RNa/SPE) increases with time, up to 2.8 kΩ cm-2 , and causes the E1/2 of the Me10Fc +/reference redox couple to drift up to 15 mV during 88 hours. Moreover, the sodium potential is very irreproducible, even initially after cell assembling the values can differ by 60 mV, likely due to extreme sensitivity of the metal surface even to an "inert and dry" glove box environment. Indeed, freshly cut sodium readily reacts with water, forming NaOH, and adsorbs impurities that can be present even in a glove box atmosphere. The oxidation layer and the amount of adsorbed impurities increase with the exposure to the glove box atmosphere, as revealed by ATR-FTIR spectroscopy. Altogether, this calls for attention when evaluating any battery materials in half-cell configurations using sodium metal as the pseudo-RE.

Research paper thumbnail of Storing energy in plastics: a review on conducting polymers & their role in electrochemical energy storage

RSC Advances, 2015

This review article on conducting polymers discusses the background & theory behind their conduct... more This review article on conducting polymers discusses the background & theory behind their conductivity, the methods to nano-engineer special morphologies & recent contributions to the field of energy (e.g.supercapacitors, batteries and fuel cells).