双功能
材料科学
磁黄铁矿
兴奋剂
分解水
化学工程
纳米技术
冶金
硫化物
催化作用
光电子学
有机化学
化学
光催化
工程类
作者
Yixian Wu,Zeshuo Meng,Xueqing Fang,Yaxin Li,Jinyu Bao,Chenxu Zhang,Yanan Wang,Hongwei Tian,Weitao Zheng
标识
DOI:10.1016/j.ceramint.2021.06.061
摘要
The development of low-price and highly efficient catalysts for hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) has always been challenging with regard to water splitting. Pyrrhotite Fe 7 S 8 has become a research hotspot due to its abundant reserves, high electrical conductivity and excellent catalytic activity. In general, introducing metal heteroatoms into transition metal sulfides (TMSs) can effectively enhance the activity and stability of TMSs. Herein, Co-doped pyrrhotite Fe 7 S 8 nanosheets were obtained by a straightforward two-step method consisting of hydrothermal treatment followed by subsequent heat treatment. Results from XPS analysis and contact angle measurements showed that doping optimized the chemical environment around iron atoms and enhanced the adsorption of water molecules on the surface of Fe 7 S 8 , thereby greatly improving the electrocatalytic efficiency of water electrolysis. Compared with other counterparts, Co 0 · 95 Fe 6 · 05 S 8 exhibited superior OER activity with an overpotential of 311 mV at a current density of 10 mA cm − 2 , and higher performance towards HER with an overpotential of 284 mV at 10 mA cm − 2 in alkaline solution. In sum, Co 0 · 95 Fe 6 · 05 S 8 is promising as a bifunctional catalyst for water splitting under alkaline conditions.
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