Facile preparation of hierarchical Ni@Mn-doped NiO hybrids for efficient and durable oxygen evolution reaction  

作　　者：Yi Liu Liang Bai Qiqi Jia Peitong Li Yao Yan Ningkai Yuan Xiaodong Hao 

机构地区：[1]School of Materials Science and Engineering,Shaanxi Key Laboratory of Green Preparation and Functionalization for Inorganic Materials,Institute of Frontier Science and Technology Transfer,Shaanxi University of Science and Technology,Xi'an 710021,China [2]Materials Institute of Atomic and Molecular Science,Shaanxi University of Science and Technology,Xi'an 710021,China

出　　处：《Chinese Chemical Letters》2023年第5期381-384,共4页中国化学快报（英文版）

基　　金：supported by National Natural Science Foundation of China(Nos.51602184 and 21902096);Natural Science Foundation of Shaanxi Province(Nos.2020JM-505 and 2020JM502);the Academic Talent Introduction Program of SUST(No.134080056)。

摘　　要：Exploring highly efficient and non-noble-metal-based electrocatalysts for oxygen evolution reaction(OER)is of great importance not only for water splitting but also for rechargeable metal-air batteries and fuel cells.Herein,we describe a simple strategy to prepare hierarchical Ni@Mn-doped Ni O hybrids using flower-like Ni-Mn layered double hydroxides(Ni Mn-LDHs)as a precursor.After calcination at 400℃for an hour under N_(2)atmosphere,the flower-like Ni Mn-LDHs transform to porous microspheres consisting of nanoparticles,in which Ni cores are encapsulated by Mn-doped NiO shells(denoted as Ni@MnNi O-400).Benefiting to this unique porous,core-shell structures and element doping,the as-prepared Ni@Mn-NiO-400 hybrid shows a low overpotential of 178 mV at the current density of 10 mA/cm^(2)and Tafel slope of 52.7 m V/dec in 1 mol/L KOH solution.More significantly,the Ni@Mn-Ni O-400 hybrid also demonstrates superior stability of 98.6%after 50 h continuously testing,much higher than pristine Ni MnLDHs and commercial IrO_(2)catalyst.In addition,theoretical simulation shows that Ni core and Mn doping greatly affect the electronic states and electronic structure of Ni O.As a result,Ni@Mn-doped Ni O hybrid possesses an optimal adsorption activity towards oxygen species than Ni O and undoped Ni@Ni O hybrid.Considering the compositional and structural flexibility of LDHs,this work may offer a simple method to prepare other non-noble metal-based electrocatalysts for OER.

关 键 词：Core-shell structure OER ELECTROCATALYSIS Water splitting First principle calculation 

分 类 号：TQ426[化学工程]