DOI | 10.1039/c9ee02388g
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| Exceptional performance of hierarchical Ni-Fe oxyhydroxide@NiFe alloy nanowire array electrocatalysts for large current density water splitting |
| Liang C.; Zou P.; Nairan A.; Zhang Y.; Liu J.; Liu K.; Hu S.; Kang F.; Fan H.J.; Yang C.
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发表日期 | 2020
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ISSN | 1754-5692
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起始页码 | 86
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结束页码 | 95
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卷号 | 13期号:1 |
英文摘要 | Water electrolysis represents a promising sustainable hydrogen production technology. However, in practical application which requires extremely large current densities (>500 mA cm-2), the oxygen evolution reaction (OER) becomes unstable and kinetically sluggish, which is a major hurdle to large-scale hydrogen production. Herein, we report an exceptionally active and binder-free NiFe nanowire array based OER electrode that allows durable water splitting at current densities up to 1000 mA cm-2 up to 120 hours. Specifically, NiFe oxyhydroxide (shell)-anchored NiFe alloy nanowire (core) arrays are prepared via a magnetic-field-assisted chemical deposition method. The ultrathin (1-5 nm) and amorphous NiFe oxyhydroxide is in situ formed on the NiFe alloy nanowire surface, which is identified as an intrinsically highly active phase for the OER. Additionally, the fine geometry of the hierarchical electrode can substantially improve charge and mass (reactants and oxygen bubbles) transfer. In an alkaline electrolyte, this OER electrode can yield current densities of 500 and 1000 mA cm-2 stably over 120 hours at overpotentials of only 248 mV and 258 mV respectively, which are dramatically lower than any recently reported overpotentials. Notably, the integrated alkaline electrolyzer (with pure Ni nanowires as HER electrode) is demonstrated to reach the current density of 1000 mA cm-2 with super low voltage of 1.76 V, outperforming the state-of-the-art industrial catalysts. Our result may represent a critical step towards an industrial electrolyzer for large-scale hydrogen production by water splitting. © 2020 The Royal Society of Chemistry. |
语种 | 英语
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scopus关键词 | Alkalinity; Binary alloys; Current density; Electrocatalysts; Electrodes; Electrolytes; Electrolytic cells; Hydrogen production; Iron compounds; Nanowires; Nickel alloys; Nickel compounds; Oxygen; Alkaline electrolytes; Chemical deposition method; Hydrogen production technology; Industrial catalyst; Large current density; Large scale hydrogen production; Oxygen evolution reaction; Water electrolysis; Iron alloys; alloy; array; catalyst; chemical reaction; electrical method; hydrogen; hydroxide; performance assessment |
来源期刊 | Energy and Environmental Science
(IF:33.25[JCR-2018],32.826[5-Year]) |
文献类型 | 期刊论文
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条目标识符 | http://gcip.llas.ac.cn/handle/2XKMVOVA/162622
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作者单位 | Division of Energy and Environment, Shenzhen International Graduate School, Tsinghua University, Shenzhen, 518055, China; School of Physical and Mathematical Sciences, Nanyang Technological University, 21 Nanyang Link637371, Singapore
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推荐引用方式 GB/T 7714 |
Liang C.,Zou P.,Nairan A.,et al. Exceptional performance of hierarchical Ni-Fe oxyhydroxide@NiFe alloy nanowire array electrocatalysts for large current density water splitting[J],2020,13(1).
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APA |
Liang C..,Zou P..,Nairan A..,Zhang Y..,Liu J..,...&Yang C..(2020).Exceptional performance of hierarchical Ni-Fe oxyhydroxide@NiFe alloy nanowire array electrocatalysts for large current density water splitting.Energy and Environmental Science,13(1).
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MLA |
Liang C.,et al."Exceptional performance of hierarchical Ni-Fe oxyhydroxide@NiFe alloy nanowire array electrocatalysts for large current density water splitting".Energy and Environmental Science 13.1(2020).
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