气候变化领域集成服务门户(CCPortal): Simultaneous interfacial chemistry and inner Helmholtz plane regulation for superior alkaline hydrogen evolution

CCPortal

DOI	10.1039/d0ee02020f
	Simultaneous interfacial chemistry and inner Helmholtz plane regulation for superior alkaline hydrogen evolution
	Zhang B.; Zhang L.; Tan Q.; Wang J.; Liu J.; Wan H.; Miao L.; Jiang J.
发表日期	2020
ISSN	17545692
起始页码	3007
结束页码	3013
卷号	13 期号:9
英文摘要	Developing highly efficient and durable alkaline hydrogen evolution reaction (HER) electrocatalysts composed of earth-abundant materials is crucial for large-scale electrochemical hydrogen production. Herein, interfacial chemistry engineering is employed to decouple the restriction of both water discharge and hydrogen adsorption free energy. And low valence state Niδ+ (δ < 1) is proposed as an efficient water-dissociation promoter based on our dual-descriptor method. Moreover, metallic and intrinsic HER-active Ni is introduced and a highly conductive edge-enriched Ni0.2Mo0.8N/Ni hybrid electrocatalyst is constructed. DFT calculations and microkinetics analysis demonstrate that the Ni site and Ni0.2Mo0.8N site have favorable hydroxyl and hydrogen species adsorption energetics, respectively, which can cooperate synergistically towards alkaline hydrogen evolution. The resulting electrocatalyst shows excellent HER electrocatalytic performance with an overpotential of about 70 mV at 300 mA cm-2 and a Tafel slope of 33 mV dec-1. It also offers outstanding operational stability at large current densities up to 200 mA cm-2. Further theoretical calculations suggest a tip-enhanced-like local electric field around the topmost Ni nanoparticles, leading to increased K-ion concentration in the inner Helmholtz plane. The HER kinetics and surface reactant density can be simultaneously improved by this hierarchical Ni0.2Mo0.8N/Ni electrocatalyst. This study might open up new avenues of reasonable design of hierarchical structures for superior electrocatalysts. This journal is © The Royal Society of Chemistry.
英文关键词	Alkalinity; Design for testability; Electric discharges; Electrocatalysts; Free energy; Hydrogen evolution reaction; Hydrogen production; Nickel; Adsorption energetics; Earth-abundant materials; Electrocatalytic performance; Hierarchical structures; Large current density; Local electric field; Operational stability; Theoretical calculations; Gas adsorption; alkalinity; concentration (composition); crystal structure; electrochemistry; Helmholtz equation; hydrogen
语种	英语
来源期刊	Energy & Environmental Science
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/189555
作者单位	School of Optical and Electronic Information, Huazhong University of Science and Technology, Wuhan, 430074, China; Hubei Key Laboratory of Ferro and Piezoelectric Materials and Devices, Faculty of Physics and Electronic Science, Hubei University, Wuhan, 430062, China
推荐引用方式 GB/T 7714	Zhang B.,Zhang L.,Tan Q.,et al. Simultaneous interfacial chemistry and inner Helmholtz plane regulation for superior alkaline hydrogen evolution[J],2020,13(9).
APA	Zhang B..,Zhang L..,Tan Q..,Wang J..,Liu J..,...&Jiang J..(2020).Simultaneous interfacial chemistry and inner Helmholtz plane regulation for superior alkaline hydrogen evolution.Energy & Environmental Science,13(9).
MLA	Zhang B.,et al."Simultaneous interfacial chemistry and inner Helmholtz plane regulation for superior alkaline hydrogen evolution".Energy & Environmental Science 13.9(2020).