文献类型：期刊文献

英文题名：Nis-Nis2 Heterostructure For Efficient Electrocatalytic Overall Urea Splitting

作者：Wei, Hehe[4]; Huang, Zixun[1]; Su, Yanyan[1]; Xie, Yusheng[1]; Li, Zhiwang[1]; Zhang, Rongbin[1]; Zhao, Zepeng[1]; Wu, Fengchi[3]; Ou, Gang[1,2]

机构：[1] College of Chemistry and Materials Science, Jinan University, Guangzhou, 511443, China; [2] Institute of Advanced Materials and Technology, Guangzhou Panyu Polytechnic, Guangzhou, 511483, China; [3] School of Innovation and Entrepreneurship, Guangdong Polytechnic Normal University, Guangzhou, 510665, China; [4] Key Laboratory for Advanced Materials, Center for Computational Chemistry, Research Institute of Industrial Catalysis, East China University of Science and Technology, 130 Meilong Road, Shanghai, 200237, China

年份：2023

外文期刊名：SSRN

收录：EI(收录号：20230141915)

语种：英文

外文关键词：Electrocatalysts - Hydrogen - Interface states - Metabolism - Sulfur compounds

摘要：Heterogeneous catalysts possess many advantages over single-phase catalysts. However, how to tune the heterogeneous interface state and density in heterostructures to optimize their electrocatalytic performance is still a challenge. Here, we propose a method for the preparation of NiS-NiS2 heterostructure by vulcanization of nickel foam at high temperature，which can effectively tune the weight ratio of NiS to NiS2 in heterostructure and their corresponding electrocatalytic urea oxidation reaction (UOR), hydrogen evolution reaction (HER) and overall urea splitting performance. The electrocatalytic activity show a trend of volcano curve with the increase of the ratio of NiS to NiS2, and the best electrocatalytic activity was obtained at the ratio of 6.74, in which the potentials at current density of 10 mA cm-2 of UOR, HER and overall urea splitting are 1.26 V, -49.5 mV and 1.32 V versus reversible hydrogen electrode (vs. RHE), and the Tafel slopes are 33.7, 74.1 and 98.5 mV ??dec-1, respectively. Furthermore, it also demonstrates excellent electrocatalytic stability. This work provides an effective way to tune the interfacial structure of heterogeneous electrocatalysts while significantly improving their electrocatalytic performance, which is beneficial to the development of efficient heterostructure and expand their applications. ? 2023, The Authors. All rights reserved.