High activity and stability in Ni_(2)P/(Co,Ni)OOH heterointerface with a multiple-hierarchy structure for alkaline hydrogen evolution reaction

作     者：LiLi Zhang Zongpeng Wang Jitang Zhang Zhiping Lin Qinghua Zhang Wenwu Zhong Guangfeng Wu LiLi Zhang;Zongpeng Wang;Jitang Zhang;Zhiping Lin;Qinghua Zhang;Wenwu Zhong;Guangfeng Wu

作者机构：College of Material Science and EngineeringChangchun University of TechnologyChangchun 130051China Zhejiang Provincial Key Laboratory for Cutting ToolsTaizhou UniversityJiaojiang 318000China Institution of PhysicsChinese Academic of ScienceBeijing 100190China 

出 版 物：《Nano Research》 (纳米研究（英文版）)

年 卷 期：2023年第16卷第5期

页      面：6552-6559页

核心收录：

学科分类：07[理学] 070304[理学-物理化学(含∶化学物理)] 0805[工学-材料科学与工程（可授工学、理学学位）] 0703[理学-化学] 0702[理学-物理学] 

基　　金：the Major Research plan of the National Natural Science Foundation of China(No.92163115) the National Natural Science Foundation(No.52072255) the Science Fund for Distinguished Young Scholars of Zhejiang Province(No.LR22E020003) the Natural Science Foundation of Zhejiang Province(Nos.LY21E020001 and LTY20E020001). 

主　　题：hydrogen evolution reaction Ni_(2)P/(Co,Ni)OOH heterointerface hierarchy 

摘      要：The fabrication of heterointerface materials with hierarchical morphologies more than two levels is a challenging yet promising approach to achieve optimal electrocatalyst for hydrogen evolution reaction(HER).Here,using a facile two-step method,we are able to prepare the Ni_(2)P/(Co,Ni)OOH heterointerface with a three-level hierarchy morphology.The multiple levels of hierarchy structures not only offer considerable area for active sites loading,but also facilitate the substance transportation,both beneficial for HER.Meanwhile,the strong charge transfer at the Ni_(2)P/(Co,Ni)OOH heterointerface eliminates the spin asymmetry and achieves the thermos-neutral adsorption of active H species.Moreover,the resulted Coulomb attraction stacks the two materials firmly,facilitating the stability.Density functional theory(DFT)and in-situ Raman measurements reveal the sufficient Ni atoms acting as the active sites.With these merits,the Ni_(2)P/(Co,Ni)OOH exhibits much better HER activity than the separate Ni_(2)P or(Co,Ni)OOH,affording a current density of 100 mA/cm^(2)at an overpotential of 169 mV and a Tafel slope of 41 mV/dec,when tested in alkaline electrolyte.This work provides inspiration for optimizing the intrinsic HER activity utilizing multiple-level hierarchy structures.