Low-temperature molten salt synthesis of MoS2@CoS2 heterostructures for efficient hydrogen evolution reaction
Low-temperature molten salt synthesis of MoS2@CoS2 heterostructures for efficient hydrogen evolution reaction
复制标题
低温熔盐合成MoS2@CoS2异质结构以实现高效析氢反应
DOI：
10.1039/d0cc01726d
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发表时间：
2020-05-21
影响因子：
4.9
通讯作者：
Huang, Wei
中科院分区：
文献类型：
--
作者：
He, Song;Du, Hongfang;Huang, Wei
以低成本熔融KSCN为反应介质和硫源，发展了一种制备MoS_2@CoS_2异质结构电催化剂的通用低温熔盐方法。这种富含缺陷结构的电催化剂对析氢反应(HER)具有很高的效率，在HER电流密度为10 mA cm(-2)时，过电位为96 mV，Tafel斜率为60 mV dec(-1)，并具有良好的耐久性。密度泛函理论(DFT)计算表明，异质结构的最佳吸氢自由能(G(H*))接近于零，这是HER性能优异的原因。
A versatile low-temperature molten salt approach has been developed for fabricating a MoS2@CoS2 heterostructure electrocatalyst, where low-cost molten KSCN serves as both the reaction medium and sulfur source. The as-obtained electrocatalyst with a defect-rich structure is highly efficient for the hydrogen evolution reaction (HER), delivering a low overpotential of 96 mV at an HER current density of 10 mA cm(-2), a small Tafel slope of 60 mV dec(-1), and outstanding durability. Density functional theory (DFT) calculations suggest that the heterostructures present an optimized Gibbs free energy of hydrogen adsorption (Delta G(H*)) close to zero, which is responsible for the excellent HER performance.