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Hierarchical Fe-doped Ni3Se4 ultrathin nanosheets as an efficient electrocatalyst for oxygen evolution reaction†
Nanoscale ( IF 5.8 ) Pub Date : 2018-02-06 00:00:00 , DOI: 10.1039/c8nr00426a
Jing Du 1, 2, 3, 4, 5 , Zehua Zou 1, 2, 3, 4, 5 , Chen Liu 4, 5, 6, 7 , Cailing Xu 1, 2, 3, 4, 5
Affiliation  

Developing highly efficient oxygen evolution reaction (OER) electrocatalysts is critical to the cost-effective generation of clean fuels. Transition-metal selenides have been proposed to be OER catalyst alternatives to noble metal based catalysts, but generally exhibit limited electrocatalytic activity. We here report hierarchical Fe-doped Ni3Se4 ((Ni,Fe)3Se4) ultrathin nanosheets as an efficient electrocatalyst for OER in alkaline electrolytes. The preparation involves a solvothermal synthesis and a topotactic conversion process. The prepared hierarchical (Ni,Fe)3Se4 ultrathin nanosheets show abundant and accessible catalytically active sites, facile charge transfer and a high specific surface area. Relative to the Ni3Se4 nanosheets, the as-prepared (Ni,Fe)3Se4 ultrathin nanosheets show a higher current density and a lower Tafel slope towards the OER. Remarkably, hierarchical (Ni,Fe)3Se4 ultrathin nanosheets supported on Ni foam exhibit an electrocatalytic OER with a current density of 10 mA cm−2 at a low overpotential of 225 mV and a small Tafel slope of about 41 mV dec−1. This study establishes (Ni,Fe)3Se4 ultrathin nanosheets as an efficient electrocatalyst for the OER that can be used in the fields of metal–air batteries and water splitting for hydrogen production.

中文翻译:

分层铁掺杂的Ni 3 Se 4超薄纳米片作为氧释放反应的有效电催化剂

开发高效的氧气析出反应(OER)电催化剂对于经济高效地生产清洁燃料至关重要。已经提出过渡金属硒化物是基于贵金属的催化剂的OER催化剂替代物,但是通常表现出有限的电催化活性。我们在这里报告分层铁掺杂的Ni 3 Se 4((Ni,Fe)3 Se 4)超薄纳米片,作为碱性电解质中OER的有效电催化剂。该制备涉及溶剂热合成和全能转化过程。制备的分层(Ni,Fe)3 Se 4超薄纳米片显示出丰富且可访问的催化活性位点,便捷的电荷转移和高比表面积。相对于Ni 3 Se 4纳米片,所制备的(Ni,Fe)3 Se 4超薄纳米片显示出更高的电流密度和更低的朝向OER的Tafel斜率。值得注意的是,负载在镍泡沫上的分级(Ni,Fe)3 Se 4超薄纳米片表现出电催化OER,其电流密度为10 mA cm -2,低过电势为225 mV,Tafel斜率小,约为41 mV dec -1。本研究建立(Ni,Fe)3 Se 4 超薄纳米片是OER的有效电催化剂,可用于金属-空气电池和制氢的水分解领域。
更新日期:2018-02-06
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