Engineered porous Ni2P-nanoparticle/Ni2P-nanosheet arrays via the Kirkendall effect and Ostwald ripening towards efficient overall water splitting  

作　　者：Yutai Wu Hui Wang Shan Ji Bruno G.Pollet Xuyun Wang Rongfang Wang 

机构地区：[1]State Key Laboratory Base for Eco-Chemical Engineering,College of Chemical Engineering,Qingdao University of Science and Technology,Qingdao,266042,China [2]College of Biological,Chemical Science and Chemical Engineering,Jiaxing University,Jiaxing,314001,China [3]Department of Energy and Process Engineering,Faculty of Engineering,Norwegian University of Science and Technology(NTNU),NO-7491,Trondheim,Norway

出　　处：《Nano Research》2020年第8期2098-2105,共8页纳米研究（英文版）

基　　金：The authors would like to thank the National Natural Science Foundation of China(Nos.51661008 and 21766032);Key Technology Research and Development Program of Shandong(No.2019GGX103029)for financially supporting this work.

摘　　要：Transitional metal phosphides with array-like structure grown on conductive support materials are promising bifunctional catalysts for the oxygen evolution reaction(OER)and hydrogen evolution reaction(HER).In this study,a method was developed to synthesize directly porous Ni2P nanosheet arrays and Ni2P nanoparticles onto nickel foam via a hydrothermal reaction followed by a phosphorization process.Mechanistic studies revealed that the allomorphs of Ni2P nanosheets and Ni2P nanoparticles in the array-like structure were formed via the Kirkendall effect and Ostwald ripening.A fully functional water electrolyzer containing Ni2P as electrodes for the OER and HER exhibited promising activity and stability.At 10 mA·cm^−2,a Ni2P cell voltage of 1.63 V was obtained,which was only 0.05 V smaller than that found for Pt/C/NF||RuO2/NF cell.The enhanced electrocatalytic performance resulted from the favorable porosity of the Ni2P arrays and the synergistic effect between Ni2P nanosheets and Ni2P nanoparticles.

关 键 词：Ni2P catalysts ARRAYS overall water splitting Kirkendall effect Ostwald ripening 

分 类 号：O64[理学—物理化学] TB383[理学—化学]