MoS_2协同过渡金属Co增强催化产氢性能

Synergistic Function between Cobalt and MoS_2 for Electrocatalytic Hydrogen Evaluation

当今社会,能源危机与环境污染问题亟需解决,清洁环保且具有高能量密度的氢能被视为理想的能量载体。电催化分解水是一种有效且可持续的制氢方法。廉价且高效MoS_2作为极具前景的产氢催化剂被广泛研究,其在酸性溶液中的催化效率已通过多种工艺优化,然而其在碱性溶液中催化性能并没有得到有效提升。首先通过水热法合成了多孔的MoS_2纳米片,然后提供了一种廉价便捷的电镀法,成功在MoS_2表面复合Co等金属纳米颗粒,优化了MoS_2在碱性溶液中的催化效率。实验表明Co-MoS_2在1 mol/L KOH中,在10 mA·cm^(-2)的电流密度下过电势仅为186 mV,Tafel斜率为81 mV·dev^(-1),大幅优于纯MoS_2的催化性能,且表现出较好的稳定性。同时,Co-MoS_2也表现出更好的催化析氧性能,在10 mA·cm^(-2)的电流密度下过电势由460降至360 mV,这意味着Co-MoS_2可进一步用于催化全水解反应。

Nowadays, the energy crisis and environmental problems are increasingly severe, and it's urgent to find a renewable clean energy source.With its high energy density and environmentally friendly advantages, hydrogen is regarded as an ideal energy carrier.One of the scalable and sustainable method, hydrogen evolution reaction, meets the future energy demands.As a promising hydrogen evolution catalysis, MoS2 has been widely studied, several methods has largely improved its function in acid electrolytes, however, its function in alkaline electrolytes hasn't been effectively promoted yet.In this article, the porous 2D MoS2 is synthesized by hydrothermal method, then a low-cost simple electroplating method for Matel-MoS2 nanocomposites fabrication is provided.Experiments reveal that Co-MoS2 has a superior catalytic performance with small Tafel slope (81 mV·dev^-1) and long term of stability.In 1 mol/L KOH, the overpotiential is as low as 186 mV at a current density of 10 mA·cm^-2 .Also, Co-MoS2 performs better oxygen evolution reaction property, the overpotiential is declined to 360, compared with 460 mV of the pristine MoS2, which means Co-MoS2 is prospecting for efficient whole cell water splitting reaction.