CoS2 needle arrays induced a local pseudo-acidic environment for alkaline hydrogen evolution

被引：58

作者：

Chen, Guozhu ^{[1
]}

Li, HuangJingWei ^{[1
]}

Zhou, Yajiao ^{[1
]}

Cai, Chao ^{[1
]}

Liu, Kang ^{[1
]}

Hu, Junhua ^{[2
]}

Li, Hongmei ^{[1
]}

Fu, Junwei ^{[1
]}

Liu, Min ^{[1
]}

机构：

[1] Cent South Univ, Sch Phys & Elect, Changsha 410083, Peoples R China

[2] Zhengzhou Univ, Sch Mat Sci & Engn, Zhengzhou 450002, Peoples R China

来源：

NANOSCALE | 2021年 / 13卷 / 32期

关键词：

BIFUNCTIONAL ELECTROCATALYST; OXYGEN REDUCTION; DOPED CARBON; EFFICIENT; NANOPARTICLES; CO9S8; OXIDE;

D O I：

10.1039/d1nr03221f

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

The alkaline electrocatalytic hydrogen evolution reaction (HER) is a potential way to realize industrial hydrogen production. However, the sluggish process of H2O dissociation, as well as the accumulation of OH- around the active sites, seriously limit the alkaline HER performance. In this work, we developed a unique CoS2 needle array grown on a carbon cloth (NAs@C) electrode as an alkaline HER catalyst. Finite-element simulations revealed that CoS2 needle arrays (NAs) induce stronger local electric field (LEF) than CoS2 disordered needles (DNs). This LEF can greatly repel the local OH- around the active sites, and then promote the forward H2O dissociation process. The local pH changes of the electrode surface confirmed the lower OH- concentration and stronger local pseudo-acidic environment of NAs@C compared to those of DNs@C. As a result, the NAs@C catalyst exhibited a low HER overpotential of 121 mV at a current density of 10 mA cm(-2) in 1 M KOH, with the Tafel slope of 59.87 mV dec(-1). This work provides a new insight into nanoneedle arrays for the alkaline HER by electric field-promoted H2O dissociation.

引用

页码：13604 / 13609

页数：7

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