Self- supported high-entropy alloy electrocatalyst for highly efficient H2 evolution in acid condition
Developing non-precious catalysts as Pt substitutes for electrochemical hydrogen evolution reaction (HER) with superior stability in acidic electrolyte is of critical importance for large-scale, low-cost hydrogen production from water. Herein, we report a CoCrFeNiAl high-entropy alloy (HEA) electroc...
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doaj-9855e4d219034e6992af0c226077717f2020-11-25T03:06:07ZengElsevierJournal of Materiomics2352-84782020-12-0164736742Self- supported high-entropy alloy electrocatalyst for highly efficient H2 evolution in acid conditionPeiyan Ma0Mingming Zhao1Long Zhang2Heng Wang3Junfeng Gu4Yuchen Sun5Wei Ji6Zhengyi Fu7School of Chemistry, Chemical Engineering and Life science, Wuhan University of Technology, Wuhan City, Hubei Province, PR ChinaSchool of Chemistry, Chemical Engineering and Life science, Wuhan University of Technology, Wuhan City, Hubei Province, PR ChinaSchool of Chemistry, Chemical Engineering and Life science, Wuhan University of Technology, Wuhan City, Hubei Province, PR ChinaEngineering Research Center of Environmental Materials and Membrane Technology, School of Materials Science and Engineering, Wuhan Institute of Technology, Wuhan City, Hubei Province, PR ChinaState Key Lab of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan City, Hubei Province, PR ChinaState Key Lab of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan City, Hubei Province, PR ChinaState Key Lab of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan City, Hubei Province, PR China; Corresponding author.State Key Lab of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan City, Hubei Province, PR China; Corresponding author.Developing non-precious catalysts as Pt substitutes for electrochemical hydrogen evolution reaction (HER) with superior stability in acidic electrolyte is of critical importance for large-scale, low-cost hydrogen production from water. Herein, we report a CoCrFeNiAl high-entropy alloy (HEA) electrocatalyst with self-supported structure synthesized by mechanical alloying and spark plasma sintering (SPS) consolidation. The HEA after HF treatment and in situ electrochemical activation for 4000 cycles of cyclic voltammetry (HF-HEAa2) presents favourable activity with overpotential of 73 mV to reach a current density of 10 mA cm−2 and a Tafel slope of 39.7 mV dec−1. The alloy effect of Al/Cr with Co/Fe/Ni at atomic level, high-temperature crystallization, as well as consolidation by SPS endow CoCrFeNiAl HEA with high stability in 0.5 M H2SO4 solution. The superior performance of HF-HEAa2 is related with the presence of metal hydroxides/oxides groups on HEA.http://www.sciencedirect.com/science/article/pii/S2352847820301544High-entropy alloyHydrogen evolution reactionElectrocatalystsAcidic electrolyteStability |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Peiyan Ma Mingming Zhao Long Zhang Heng Wang Junfeng Gu Yuchen Sun Wei Ji Zhengyi Fu |
spellingShingle |
Peiyan Ma Mingming Zhao Long Zhang Heng Wang Junfeng Gu Yuchen Sun Wei Ji Zhengyi Fu Self- supported high-entropy alloy electrocatalyst for highly efficient H2 evolution in acid condition Journal of Materiomics High-entropy alloy Hydrogen evolution reaction Electrocatalysts Acidic electrolyte Stability |
author_facet |
Peiyan Ma Mingming Zhao Long Zhang Heng Wang Junfeng Gu Yuchen Sun Wei Ji Zhengyi Fu |
author_sort |
Peiyan Ma |
title |
Self- supported high-entropy alloy electrocatalyst for highly efficient H2 evolution in acid condition |
title_short |
Self- supported high-entropy alloy electrocatalyst for highly efficient H2 evolution in acid condition |
title_full |
Self- supported high-entropy alloy electrocatalyst for highly efficient H2 evolution in acid condition |
title_fullStr |
Self- supported high-entropy alloy electrocatalyst for highly efficient H2 evolution in acid condition |
title_full_unstemmed |
Self- supported high-entropy alloy electrocatalyst for highly efficient H2 evolution in acid condition |
title_sort |
self- supported high-entropy alloy electrocatalyst for highly efficient h2 evolution in acid condition |
publisher |
Elsevier |
series |
Journal of Materiomics |
issn |
2352-8478 |
publishDate |
2020-12-01 |
description |
Developing non-precious catalysts as Pt substitutes for electrochemical hydrogen evolution reaction (HER) with superior stability in acidic electrolyte is of critical importance for large-scale, low-cost hydrogen production from water. Herein, we report a CoCrFeNiAl high-entropy alloy (HEA) electrocatalyst with self-supported structure synthesized by mechanical alloying and spark plasma sintering (SPS) consolidation. The HEA after HF treatment and in situ electrochemical activation for 4000 cycles of cyclic voltammetry (HF-HEAa2) presents favourable activity with overpotential of 73 mV to reach a current density of 10 mA cm−2 and a Tafel slope of 39.7 mV dec−1. The alloy effect of Al/Cr with Co/Fe/Ni at atomic level, high-temperature crystallization, as well as consolidation by SPS endow CoCrFeNiAl HEA with high stability in 0.5 M H2SO4 solution. The superior performance of HF-HEAa2 is related with the presence of metal hydroxides/oxides groups on HEA. |
topic |
High-entropy alloy Hydrogen evolution reaction Electrocatalysts Acidic electrolyte Stability |
url |
http://www.sciencedirect.com/science/article/pii/S2352847820301544 |
work_keys_str_mv |
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