Nanoporous Cobalt-Selenide as High-Performance Bifunctional Electrocatalyst towards Oxygen Evolution and Hydrazine Oxidation
Nanoporous Cobalt-Selenide as High-Performance Bifunctional Electrocatalyst towards Oxygen Evolution and Hydrazine Oxidation
复制标题
纳米多孔硒化钴作为高性能双功能电催化剂，用于析氧和肼氧化
DOI：
10.1149/1945-7111/abb4ad
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发表时间：
2020-01-10
影响因子：
3.9
通讯作者：
Xing, Pengfei
中科院分区：
文献类型：
--
作者：
Feng, Zhongbao;Gao, Bo;Xing, Pengfei
放氧反应(OER)的迟缓动力学抑制了水的分解，这可能导致整体水电解的高过电位。然而，开发高效的OER电催化剂，用低理论电势的联氨氧化反应(HZOR)取代OER是一种有效的策略。本文采用一步电沉积法制备了一种具有纳米孔结构的双功能CoSe-3催化剂。与COSE-2和COSE-4催化剂相比，COSE-3催化剂表现出了优异的催化性能和对OER的稳定性，相对于RHE的低过电势为254 mV，达到了10 mA cm(-2)和高的耐久性(100 mA cm(-2)下16h)。COSE-3对HZOR表现出优异的性能，在0.4V对RHE的电流密度为278 mA cm(-2)，并且具有很高的稳定性(在200 mA cm(-2)下24小时)。特别是揭示了双功能COSE-3电催化剂催化性能显著提高的机理。这可能与其均匀分布的纳米孔结构、过量的Se含量导致的高电导率、较大的ECSA以及CoSe-3的纳米孔结构导致的超疏空气表面有关。
Water splitting is inhibited by the sluggish kinetics of oxygen evolution reaction (OER), which can lead to a high overpotential for overall water electrolysis. Nevertheless, it is an effective strategy to explore high efficient OER electrocatalyst and replace OER with hydrazine oxidation reaction (HzOR) of low theoretical potential. Herein, we report a bifunctional CoSe-3 catalyst with nanoporous structure via one-step electrodeposition. In comparison with CoSe-2 and CoSe-4, CoSe-3 catalyst shows outstanding catalytic performance and stability towards OER with a low overpotenial of 254 mV vs RHE to achieve 10 mA cm(-2)and a high durability (16 h at 100 mA cm(-2)). CoSe-3 further shows excellent performance towards HzOR with an enomous current density of 278 mA cm(-2)at 0.4 V vs RHE and a high stability (24 h at 200 mA cm(-2)). Specially, the mechanism reason of the remarkably enhanced catalytic performance of bifunctional CoSe-3 electrocatalyst was revealed. This can be associated with its uniformly distributed nanoporous structure, high conductivity induced by the excess of Se content, large ECSA and its superaerophobic surface caused by nanoporous structure of CoSe-3.