Electrocatalyst Research Papers - Academia.edu (original) (raw)

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- Engineering, Electrochemistry, Cyclic Voltammetry, Fuel Cell

Electrochemical water splitting is one of the promising ways to enhance energy with less outflow. In this regard different electrocatalysts have been reported for Oxygen evolution reaction (OER) to get alternative of noble metal based electrocatalysts. In this work, we have introduced Cadmium-oxide/Cobalt-oxide (CdO/Co3O4) nanocomposite by co-precipitation chemical strategy with impressive OER performance in alkaline medium. Almost 310 mV overpotential value is required to achieve 10 mA/cm2 current density with Tafel slope value of 62 mV/Dec. The as synthesized nanocomposite has stability of 6h as its longer electrochemical performance.

- by IJOEST Journal
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- Electrochemistry, Cobalt Oxide, Electrocatalyst, Oxygen evolution reaction

Hydrogen production in the microfluidic alkaline membraneless electrolyzer (μAME) marks a new paradigm in sustainable energy technology. One challenge in this field is implementing a bifunctional catalyst to catalyze hydrogen evolution reaction and oxygen evolution reaction using methods compatible with microfabrication techniques. Herein, the scalable synthesis, micropatterning, and performance of a nickel nitride (Ni 3 N/Ni) bifunctional catalyst are demonstrated. Microfabrication is used to pattern Ni microelectrodes, and nitridation and N− H grafting of the electrodeswhich also act as the catalystsare achieved by ammonia plasma. These electrodes are incorporated into the μAME device, and the electrolyte flow rate is optimized to maximize gas product separation. The μAME is operated in a twoelectrode configuration exhibiting a current density of 263.73 mA cm −2 at 2.5 V and a stable 6 h operation for overall water splitting. The μAME performance efficiency is 99.86%, with a current density of 150 mA cm −2. Gas chromatography of the electrolysis products revealed no gas cross-over across the electrodes. Volumetric collection efficiencies of 97.72% for H 2 and 96.14% for O 2 are obtained. The performance of the μAME is comparable to a membrane-based electrolyzer operating under stringent conditions of high temperature (60−80°C) and extreme electrolyte pH (30−40 wt % KOH).

- by Pawan Kumar
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- Electrochemistry, Electrocatalysis, Microfabrication, Water Splitting
- by Amitabha De
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- Engineering, Conducting Polymer, Physical sciences, Energy Storage
- by Wenbin Hu
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- Review, Ammonia, Electro-oxidation, Electrocatalyst
- by Kingtsai Jeng
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- Environmental Engineering, Chemical Engineering, Carbon Nanotubes, Carbon Nanotube
- by Suddhasatwa Basu
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- Engineering, Hydrogen Energy, CHEMICAL SCIENCES, Direct Ethanol Fuel Cell
- by Alex A Volinsky
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- Engineering, Hydrogen Energy, CHEMICAL SCIENCES, Electrocatalyst
- by Yining Zhang
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- Engineering, Fuel Cell, CHEMICAL SCIENCES, Water Electrolysis
- by Yongfu Tang
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- Engineering, Transmission Electron Microscopy, Cyclic Voltammetry, Proton Exchange Membrane Fuel Cells
- by Paweł Ślepski and +1
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- Engineering, Materials Engineering, Civil Engineering, Analytical Chemistry
- by Nilesh Mahale
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- Analytical Chemistry, Electroanalytical Chemistry, Microwave Irradiation, Water Electrolysis
- by Maryam Borghei
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- Engineering, Hydrogen Energy, CHEMICAL SCIENCES, Electrocatalyst
- by Antonio Sáez
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- Engineering, Kinetics, Electrocatalysis, Fuel Cell
- by Ratna Balgis
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- Engineering, CHEMICAL SCIENCES, Electrocatalyst, Power Sources
- by Tae-Whan Hong
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- Engineering, Materials Science, Carbon Nanotube, Cyclic Voltammetry
- by Lorenzo Stievano
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- Engineering, X ray absorption spectroscopy, Metal Organic Frameworks, Physical sciences
- by Kingtsai Jeng
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- Engineering, Performance, Carbon Nanotube, Electrocatalysis
- by weixiang chen
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- Engineering, Nanoparticle, Performance, Transmission Electron Microscopy
- by Claudia Yañez
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- Engineering, Environmental Engineering, Materials Engineering, Chemical Engineering
- by Yongfu Tang
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- Engineering, Carbon, Morphology, Transmission Electron Microscopy
- by An-Ya Lo
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- Materials Engineering, Chemical Engineering, Microstructure, Carbon
- by Sandrine Berthon-Fabry
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- Engineering, Chemical Engineering, Materials Science, Chemistry
- by Juan Gautier
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- Engineering, Materials Science, Chemistry, Copper

Pure iron metal target was sputtered onto carbon nanotube grown on carbon paper to fabricate iron-based catalysts for the oxygen reduction reaction (ORR). The carbon nanotube-supported Fe-based catalysts have active sites which are... more

- by Tae-Whan Hong
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- Engineering, Materials Science, Carbon Nanotube, Cyclic Voltammetry
- by Prof. Jagadeesh Bhattarai
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- XRD, Electrocatalyst
- by weixiang chen
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- Engineering, Nanoparticle, Performance, Transmission Electron Microscopy
- by Fengqiang Sun
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- Engineering, Morphology, Transmission Electron Microscopy, Cyclic Voltammetry

Nickel–cobalt oxalate (Ni2.5Co5C2O4–nH2O) based block-like nanostructure has been introduced as superior electrocatalyst compared to nickel–cobalt oxide (NiCo2O4) for alkaline water oxidation.

- by Sourav Ghosh
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- Catalysis, Cobalt, Nickel, Electrocatalyst

Molybdenum carbide (Mo2C)-based electrocatalysts were prepared using two different carbon supports, commercial carbon nanotubes (CNTs) and synthesised carbon xerogel (CXG), to be studied from the point of view of both capacitive and electrocatalytic properties. Cation type (K+ or Na+) in the alkaline electrolyte solution did not affect the rate of formation of the electrical double layer at a low scan rate of 10 mV s−1. Conversely, the different mobility of these cations through the electrolyte was found to be crucial for the rate of double-layer formation at higher scan rates. Molybdenum carbide supported on carbon xerogel (Mo2C/CXG) showed ca. 3 times higher double-layer capacity amounting to 75 mF cm−2 compared to molybdenum carbide supported on carbon nanotubes (Mo2C/CNT) with a value of 23 mF cm−2 due to having more than double the surface area size. The electrocatalytic properties of carbon-supported molybdenum carbides for the oxygen reduction reaction in alkaline media were ...

- by Diogo Santos
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- Catalysis, Nanomaterials, Oxygen Reduction Reaction, Electrocatalyst

Spinel-type binary transition metal oxides of copper and manganese with composition CuxMn3−xO4 (with x=1.0; 1.1; 1.2; 1.3 and 1.4) were prepared in powder forms by thermal decomposition of nitrate precursors at different temperatures. Their structural properties have been examined by X-ray powder diffraction (XRD), oxidation power and X-ray Photoelectron Spectroscopy (XPS) measurements. To study the effects of solid state properties

- by Juan Gautier
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- Engineering, Materials Science, Chemistry, Copper
- by Goeran Lindbergh
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- Engineering, Inorganic Chemistry, Performance, Transmission Electron Microscopy
- by Snezana Gojkovic
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- Engineering, Carbon, Nanoparticle, Cyclic Voltammetry
- by Pawel Wagner
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- Engineering, Scanning Electron Microscopy, Morphology, Conducting Polymers
- by Parasuraman Selvam
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- Multidisciplinary, Electrocatalyst
- by Tianyan You
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- Analytical Chemistry, Electrospinning, Nanoparticles, Electroanalysis
- by Ravindra Nath Singh
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- Engineering, Nanocomposites, Hydrogen Energy, CHEMICAL SCIENCES

The paper reports an application of CO stripping-voltammetry as a diagnostic tool for the determination of surface composition of various PtRu nanoparticles (NPs). A series of electrochemical experiments on different systems, including monometallic Pt and Ru, a commercially available PtRu alloy, Ru@Pt (Ru NPs covered by a Pt shell), and their physical mixtures verified that the surface of the Ru@Pt particles does not contain significant amounts of ruthenium. A large cathodic shift (200 mV) of the main CO stripping peak of the Ru@Pt with respect to that of Pt was observed, consistent with what has been found at other catalysts with a Pt skin but of a different architecture. An additional small separate stripping peak at a potential corresponding to the oxidation of adsorbed CO at Pt/C is interpreted as being due to either separate Pt particles in the catalyst or thick Pt shells at a minor fraction of the Ru@Pt particles. Since the method probes the whole sample it will be useful for assessment of catalyst homogeneity.► Synthesis of nanoparticles in which a thin shell of one metal covers a core of another. ► The shell metal has its ability to electrooxidise CO changed by the core. ► This change in electrocatalytic activity can be used to asess the structure of the particles.

Pt-based electrocatalysts were prepared on different carbon supports which are multiwall carbon nanotubes (MWCNTs), Vulcan XC 72R (VXR) and black pearl 2000 (BP2000) using a supercritical carbon dioxide (scCO2) deposition technique. These catalysts were characterized by using X-ray diffraction (XRD), high-resolution transmission electron microscopy (HRTEM) and cyclic voltammetry (CV). XRD and HRTEM results demonstrated that the scCO2 deposition technique enables a high surface area metal phase to be deposited, with the size of the Pt particles ranging from 1 to 2 nm. The electrochemical surface areas (ESAs) of the prepared electrocatalysts were compared to the surface areas of commercial ETEK Pt/C (10 wt% Pt) and Tanaka Pt/C (46.5 wt% Pt) catalysts. The CV data indicate that the ESAs of the prepared Pt/VXR and Pt/MWCNT catalysts are about three times larger than that of the commercial ETEK catalyst for similar (10 wt% Pt) loadings. Oxygen reduction activity was investigated by hydrodynamic voltammetry. From the slope of Koutecky–Levich plots, the average number of electrons transferred in the oxygen reduction reaction (ORR) was 3.5, 3.6 and 3.7 for Pt/BP2000, Pt/VXR and Pt/MWCNT, correspondingly, which indicated almost complete reduction of oxygen to water.

- by Ayse Bayrakceken and +3
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- Engineering, Carbon, Carbon Nanotubes, Carbon Nanotube
- by Maritza Paez
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- Engineering, Environmental Engineering, Materials Engineering, Chemical Engineering
- by Mamun Jamal and +1
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- Engineering, Analytical Chemistry, Scanning Electron Microscopy, Ionic Liquid
- by E. Ticianelli
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- Engineering, CHEMICAL SCIENCES, Electrocatalyst, Power Sources
- by Didem ÇAKMAK
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- Materials Engineering, Electrochemistry, Cyclic Voltammetry, Polymers
- by Fatma Kandemirli
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- Engineering, Materials Science, Catalysis, Nanoparticle
- by yansheng wang
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- Engineering, Materials Science, Catalysis, Transmission Electron Microscopy

Introduction The electrolysis of water has been at the forefront of catalysis research for over a decade and has gained tremendous attention since the introduction of metal-air cells and photoelectrochemical (PEC) water splitting devices that bridge the gap between carbon-based fuels and alternative energy resources.1 However, these substantial advancements are still very expensive and inefficient to implement due in part to the non-spontaneous nature of the oxygen evolution reaction (OER). The OER is energy intensive; therefore, developing ways of reducing the overpotential and increasing the current throughput with catalytic materials is required.1,2 The OER is a very complex mechanism that consists of various adsorption interactions at the electrode-electrolyte interface.2 Therefore, efficient catalytic electrodes have a high active surface area for adsorbing intermediates, are stable in the electrolytic medium for long periods of time, and are good at electron transfer processes...

- by Mary Lou Lindstrom
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- Materials Science, Catalysis, Electrocatalyst
- by P. Haldar
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- Engineering, Corrosion, Proton Exchange Membrane Fuel Cells, Physical sciences
- by Parasuraman Selvam
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- Multidisciplinary, Electrocatalyst
- by Kevin Huang
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- Engineering, Comparative Study, Drying, Current Density