Fabrication of nanoporous Ni and NiO via a dealloying strategy for water oxidation catalysis

作     者：Xiangrong Ren Yiyue Zhai Qi Zhou Junqing Yan Shengzhong Liu Xiangrong Ren;Yiyue Zhai;Qi Zhou;Junqing Yan;Shengzhong Liu

作者机构：Key Laboratory of Applied Surface and Colloid ChemistryMinistry of EducationShaanxi Engineering Lab for Advanced Energy TechnologySchool of Materials Science and EngineeringShaanxi Normal UniversityXi'an 710119ShaanxiChina State Key Laboratory of Advanced Processing and Recycling of Nonferrous MetalsLanzhou University of TechnologyLanzhou 730050GansuChina Materials Science and Engineering CollegeLanzhou University of TechnologyLanzhou 730050GansuChina 

出 版 物：《Journal of Energy Chemistry》 (能源化学（英文版）)

年 卷 期：2020年第29卷第11期

页      面：125-134页

核心收录：

学科分类：081705[工学-工业催化] 07[理学] 070205[理学-凝聚态物理] 08[工学] 0817[工学-化学工程与技术] 080501[工学-材料物理与化学] 0805[工学-材料科学与工程（可授工学、理学学位）] 0702[理学-物理学] 

基　　金：the funding support from the National Natural Science Foundation of China(No.51661018) the support from National Key Research Program of China(2017YFA0204800,2016YFA0202403) Natural Science Foundation of China(No.21603136) the National Science Basic Research Plan in Shaanxi Province of China(2017JM2007) the Changjiang Scholar and Innovative Research Team(IRT_14R33) The 111 Project(B14041) 

主　　题：Rapid solidification Dealloying Nanoporous Ni Electrocatalyst OER 

摘      要：Nickel oxides and(oxy)hydroxides are promising replacements for noble-metal-based catalysts owing to their high activity and good long-term stability for the oxygen evolution reaction(OER). Herein, we developed nanoporous Ni by a method of combined rapid solidification and chemical dealloying. Subsequently,nanoporous Ni O was obtained via heating treatment, the macropore and skeleton sizes of the NiO originated from Ni10Al90 alloy are 100–300 nm and 80–200 nm, respectively. Benefiting from the multi-stage nanoporous structure and high specific surface area, the nanoporous NiO demonstrates an outstanding OER, reaching 20 mA cm-2 at an overpotential of 356 mV in 1 M KOH. The corresponding Tafel slope and apparent activation energy are measured to be 76.73 mV dec-1 and 29.0 kJ mol-1, respectively. Moreover,kinetic analysis indicates that the Ni O catalyst shows pseudocapacitive characteristics, and the improved current is attributed to the high-rate pseudocapacitive behavior that efficiently maintains increased nickel redox cycling to accelerate the reaction rates. After 1000 cycles of voltammetry, the overpotential of the NiO decreases by 22 mV(j = 10 mA cm-2), exhibiting excellent stability and durability.