气候变化领域集成服务门户(CCPortal): Exceptional performance of hierarchical Ni-Fe oxyhydroxide@NiFe alloy nanowire array electrocatalysts for large current density water splitting

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DOI	10.1039/c9ee02388g
	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.
发表日期	2020
ISSN	17545692
起始页码	86
结束页码	95
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.
英文关键词	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
语种	英语
来源期刊	Energy & Environmental Science
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/189760
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
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).
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 & Environmental Science,13(1).
MLA	Liang C.,et al."Exceptional performance of hierarchical Ni-Fe oxyhydroxide@NiFe alloy nanowire array electrocatalysts for large current density water splitting".Energy & Environmental Science 13.1(2020).