Electrodeposition of Cobalt Nickel Hydroxide Composite as a High-Efficiency Catalyst for Hydrogen Evolution Reactions
It is challenging but imperative to develop highly efficient, low-cost and environmentally friendly electrocatalysts to produce H2 fuel through water splitting. In order to improve the electrochemical performance of Co-base catalyst for hydrogen evolution reaction (HER), nanoporous cobalt nickel hyd...
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Published in | Journal of the Electrochemical Society Vol. 164; no. 9; pp. H587 - H592 |
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Main Authors | , , , |
Format | Journal Article |
Language | English |
Published |
The Electrochemical Society
01.01.2017
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Online Access | Get full text |
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Summary: | It is challenging but imperative to develop highly efficient, low-cost and environmentally friendly electrocatalysts to produce H2 fuel through water splitting. In order to improve the electrochemical performance of Co-base catalyst for hydrogen evolution reaction (HER), nanoporous cobalt nickel hydroxide (CoNi) composites were fabricated on the 3D nickel foam (NF) by a cyclic voltammetry method. With a doping of nickel hydroxide, the electrocatalytic activity of the catalysts was significantly enhanced. As-prepared optimal CoNi/NF electrode is able to deliver a current density of 10 mA/cm2 with an overpotential (η) of only 77 mV, which is much lower than of Co/NF electrode (185.5 mV) and Ni/NF electrode (189 mV), and shows exceeding stability and durability. The CoNi/NF catalyst also displays extraordinary performance at high current densities (e.g., 200 mA/cm2 at η = 204 mV), and is comparable to the best Co-based HER electrocatalysts reported to date. The high active surface areas (about 14 times higher than the bare NF), high surface wettability and low charge-transfer resistance of CoNi/NF catalyst, together with effective mass transport offered by the 3D nanoporous structure, all contribute to the extraordinary synergistic HER performance. |
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Bibliography: | 0761709JES |
ISSN: | 0013-4651 1945-7111 |
DOI: | 10.1149/2.0761709jes |