نتایج جستجو برای: electrocatalyst

تعداد نتایج: 2235  

Journal: :Nanoscale 2014
Paul C Jennings Hristiyan A Aleksandrov Konstantin M Neyman Roy L Johnston

Density functional theory calculations are performed on 38 and 79 metal atom truncated octahedron clusters to study oxygen dissociation as a model for the initial stage of the oxygen reduction reaction. Pure platinum and alloyed platinum-titanium core-shell systems are investigated. It is found that barrierless oxygen dissociation occurs on the (111) facet of the pure platinum clusters. A barri...

2017
Mohammad Shamsuddin Ahmed Young-Bae Kim

3D and porous reduced graphene oxide (rGO) catalysts have been prepared with sp3-hybridized 1,4-diaminobutane (sp3-DABu, rGO-sp3-rGO) and sp2-hybridized 1,4-diaminobenzene (sp2-DABe, rGO-sp2-rGO) through a covalent amidation and have employed as a metal-free electrocatalyst for oxygen reduction reaction (ORR) in alkaline media. Both compounds have used as a junction between functionalized rGO l...

Journal: :Analytical chemistry 2013
Stephen E Fosdick Sean P Berglund C Buddie Mullins Richard M Crooks

Here we report simultaneous screening of bimetallic electrocatalyst candidates for the oxygen reduction reaction (ORR) using bipolar electrochemistry. The analysis is carried out by dispensing different bimetallic precursor compositions onto the cathodic poles of an array of bipolar electrodes (BPEs) and then heating them in a reducing atmosphere to yield the catalyst candidates. Because BPEs d...

Journal: :Chemical Society reviews 2016
Janina Willkomm Katherine L Orchard Anna Reynal Ernest Pastor James R Durrant Erwin Reisner

The development of synthetic systems for the conversion of solar energy into chemical fuels is a research goal that continues to attract growing interest owing to its potential to provide renewable and storable energy in the form of a 'solar fuel'. Dye-sensitised photocatalysis (DSP) with molecular catalysts is a relatively new approach to convert sunlight into a fuel such as H2 and is based on...

2016
Shi-Jie Yuan Xiao-Hu Dai

Developing efficient, low-cost, and stable carbon-based catalysts for oxygen reduction reaction (ORR) to replace the expensive platinum-based electrocatalysts remains a major challenge that hamper the practical application of fuel cells. Here, we report that N, Fe, and S co-doped nanoporous carbon material, derived via a facile one-step pyrolysis of sewage sludge, the major byproduct of wastewa...

2014
Agnieszka Martyla Maciej Kopczyk Piotr Marciniak Robert Przekop

BACKGROUND Electro-oxidation of methanol in acidic solution was investigated on a Pt/SnO2 based electrocatalyst obtained by the sol-gel method. Pt/SnO2 systems were prepared by one pot synthesis using a sol-gel method and tin (IV) acetate as a precursor of SnO2 and water solution of hexachloroplatinum acid as a source of metallic phase. RESULTS The described method, thanks to its simplicity a...

Journal: :Nature communications 2014
Thandavarayan Maiyalagan Karalee A Jarvis Soosairaj Therese Paulo J Ferreira Arumugam Manthiram

Development of efficient, affordable electrocatalysts for the oxygen evolution reaction and the oxygen reduction reaction is critical for rechargeable metal-air batteries. Here we present lithium cobalt oxide, synthesized at 400 °C (designated as LT-LiCoO2) that adopts a lithiated spinel structure, as an inexpensive, efficient electrocatalyst for the oxygen evolution reaction. The catalytic act...

2017
Shichuan Chen Zhixiong Kang Xiaodong Zhang Junfeng Xie Hui Wang Wei Shao XuSheng Zheng Wensheng Yan Bicai Pan Yi Xie

Identification of active sites in an electrocatalyst is essential for understanding of the mechanism of electrocatalytic water splitting. To be one of the most active oxygen evolution reaction catalysts in alkaline media, Ni-Fe based compounds have attracted tremendous attention, while the role of Ni and Fe sites played has still come under debate. Herein, by taking the pyrrhotite Fe7S8 nanoshe...

Journal: :Science China. Materials 2022

The design of highly active and stable catalysts for the oxygen evolution reaction (OER) in acidic media has become an attractive research area development energy conversion storage technologies. However, progress this been limited by poor understanding dynamic structure under realistic OER conditions. Here, atomic Co-doped nanoporous RuO2 electrocatalyst, which exhibited excellent activity sta...

2011
Yu Bao Jixia Song Yan Mao Dongxue Han Fan Yang Li Niu Ari Ivaska

Graphene oxide-templated polyaniline (GO-PAN) microsheets were prepared via oxidation polymerization of aniline with graphene oxide (GO) as template. By applying this approach, irregularly shaped GO-PAN microsheets were obtained which was revealed by scanning electron microscopy (SEM). Cyclic voltammetry (CV) and differential pulse voltammetry (DPV) measurements demonstrated that the resulted G...

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