Waste to wealth:Defect-rich Ni-incorporated spent LiFePO_(4)for efficient oxygen evolution reaction

作     者：Baihua Cui Chang Liu Jinfeng Zhang Jijun Lu Siliang Liu Fangshuai Chen Wei Zhou Guoyu Qian Zhi Wang Yida Deng Yanan Chen Wenbin Hu 崔柏桦;刘畅;张金凤;陆继军;刘丝靓;陈方帅;周伟;钱国余;王志;邓意达;陈亚楠;胡文彬

作者机构：Joint School of National University of Singapore and Tianjin UniversityInternational Campus of Tianjin UniversityFuzhou 350207China School of Materials Science and EngineeringTianjin UniversityTianjin 300372China Key Laboratory of Green Process and EngineeringNational Engineering Laboratory for Hydrometallurgical Cleaner Production TechnologyInstitute of Process EngineeringChinese Academy of SciencesBeijing 100190China School of ScienceTianjin UniversityTianjin 300072China 

出 版 物：《Science China Materials》 (中国科学（材料科学（英文版）)

年 卷 期：2021年第64卷第11期

页      面：2710-2718页

核心收录：

学科分类：0808[工学-电气工程] 081705[工学-工业催化] 08[工学] 0817[工学-化学工程与技术] 

基　　金：the National Natural Science Foundation of China(91963113) 

主　　题：functional conversion spent cathode LiFePO4 oxygen evolution reaction DFT calculation 

摘      要：The development of efficient strategies to recycle lithium-ion battery(LIB)electrode materials is an important yet challenging goal for the sustainable management of battery *** work reports a facile and economically efficient method to convert spent cathode material,LiFePO_(4),into a high-performance NiFe oxy/hydroxide catalyst for the oxygen evolution reaction(OER).Herein,Ni-LiFePO_(4)is synthesized via the wetness impregnation method and further evolves into defect-rich NiFe oxy/hydroxide nanosheets during the *** introduction of the Ni promoter together with in situ evolution strengthens the electronic interactions among the metal sites and creates an abundance of ***,the evolved Ni-LiFePO_(4)delivers a low overpotential of 285 mV at 10 mA cm-^(2)and a small Tafel slope of 45 mV dec^(-1),outperforming pristine LiFePO_(4)and is even superior to the benchmark catalyst RuO_(2).Density functional theory(DFT)calculations reveal that the introduction of Ni effectively activates Fe sites by optimizing the free energy of the*OOH intermediate and that the abundance of oxygen defects facilitates the oxygen desorption step,synergistically enhancing the OER performance of LiFePO_(4).As a green and versatile method,this is a new opportunity for the scalable fabrication of excellent electrocatalysts based on spent cathode materials.