Wu Wenzhuo, Niu Chunyao, Tian Qingyong, Liu Wei, Niu Guowei, Zheng Xiaoli, Li Chong, Jia Yu, Wei Cong, Xu Qun
College of Materials Science and Engineering, Zhengzhou University, Zhengzhou 450052, China.
Chem Commun (Camb). 2020 Dec 4;56(93):14701-14704. doi: 10.1039/d0cc05888b. Epub 2020 Nov 10.
Cost-effective and durable electrocatalysts for the alkaline hydrogen evolution reaction (HER) are urgently required. The slow HER kinetics suppressed by water dissociation hinder the application of catalysts in alkaline media. Herein, we constructed an amorphous heterostructure that combined amorphous-MoO (A-MoO) and MoS by in situ oxidizing amorphization of S-vacancy MoS. The optimal A-MoO/MoS catalyst exhibited a competitive HER overpotential of -146 mV at η = -10 mA cm. DFT calculations indicate that A-MoO can reduce the energy barriers of water dissociation and H formation, and the heterointerfaces can facilitate charge transfer.
迫切需要用于碱性析氢反应（HER）的具有成本效益且耐用的电催化剂。水离解抑制的缓慢HER动力学阻碍了催化剂在碱性介质中的应用。在此，我们通过对硫空位MoS进行原位氧化非晶化构建了一种由非晶态MoO（A-MoO）和MoS组成的非晶异质结构。最佳的A-MoO/MoS催化剂在η = -10 mA cm时表现出-146 mV的竞争性HER过电位。密度泛函理论计算表明，A-MoO可以降低水离解和H形成的能垒，并且异质界面可以促进电荷转移。
