过电位
纳米片
材料科学
催化作用
过渡金属
层状双氢氧化物
单层
金属
离解(化学)
化学工程
无机化学
金属氢氧化物
纳米技术
分解水
氢氧化物
电化学
电极
物理化学
化学
冶金
有机化学
光催化
工程类
作者
Zhengju Zhu,Huajie Yin,Chun‐Ting He,Mohammad Al‐Mamun,Porun Liu,Lixue Jiang,Yong Zhao,Yun Wang,Hua Gui Yang,Zhiyong Tang,Dan Wang,Xiaoming Chen,Huijun Zhao
标识
DOI:10.1002/adma.201801171
摘要
Abstract The vast majority of the reported hydrogen evolution reaction (HER) electrocatalysts perform poorly under alkaline conditions due to the sluggish water dissociation kinetics. Herein, a hybridization catalyst construction concept is presented to dramatically enhance the alkaline HER activities of catalysts based on 2D transition metal dichalcogenides (TMDs) (MoS 2 and WS 2 ). A series of ultrathin 2D‐hybrids are synthesized via facile controllable growth of 3d metal (Ni, Co, Fe, Mn) hydroxides on the monolayer 2D‐TMD nanosheets. The resultant Ni(OH) 2 and Co(OH) 2 hybridized ultrathin MoS 2 and WS 2 nanosheet catalysts exhibit significantly enhanced alkaline HER activity and stability compared to their bare counterparts. The 2D‐MoS 2 /Co(OH) 2 hybrid achieves an extremely low overpotential of ≈128 mV at 10 mA cm −2 in 1 m KOH. The combined theoretical and experimental studies confirm that the formation of the heterostructured boundaries by suitable hybridization of the TMD and 3d metal hydroxides is responsible for the improved alkaline HER activities because of the enhanced water dissociation step and lowers the corresponding kinetic energy barrier by the hybridized 3d metal hydroxides.
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