Enhancing the activity of FeNi bimetallic electrocatalysts on overall water splitting by Nd_(2)O_(3)-induced FeNi lattice contraction  

作　　者：Jiajia Li Yunong Qin Tianyu Tan Qiancheng Zhu Bo Ouyang Erjun Kan Wenming Zhang 

机构地区：[1]Province-Ministry Co-construction Collaborative Innovation Center of Hebei Photovoltaic Technology,College of Physics Science and Technology,Hebei University,Baoding 071002,Hebei,China [2]MIIT Key Laboratory of Semiconductor Microstructure and Quantum Sensing,Nanjing University of Science and Technology,Nanjing 210094,Jiangsu,China

出　　处：《Journal of Energy Chemistry》2023年第12期42-50,I0003,共10页能源化学（英文版）

基　　金：supported by the National Natural Science Foundation of China (NSFC) (52171206, 51762013);the Key Project of Hebei Natural Science Foundation (E20202201030);the BeijingTianjin-Hebei Collaborative Innovation Community Construction Project (21344301D);The Second Batch of Young Talent of Hebei Province (70280016160250, 70280011808);the Key Fund in Hebei Province Department of Education China (ZD2021014);The Central Government Guide Local Funding Projects for Scientific and Technological Development (216Z4404G, 206Z4402G);the Interdisciplinary Research Program of Natural Science of Hebei University (DXK202107);the China Postdoctoral Science Foundation (No. 2021M701718)。

摘　　要：The development of high-efficiency and cost-effective bifunctional electrocatalysts for overall water splitting remains a formidable challenge.Herein,FeNi-Nd_(2)O_(3) nanoparticles anchored on N-doped carbon nanotubes(FeNi-Nd_(2)O_(3)/NCN) are designed for highly effective overall water splitting via a facile two-step hydrothermal approach.The synthetic FeNi-Nd_(2)O_(3) hetero-trimers(Fe 2p-Ni 2p-Nd 3d orbital coupling)on NCN achieve excellent oxygen evolution reaction(OER) and hydrogen evolution reaction(HER) activities with overpotentials of 270 and 120 mV at 10 mA cm^(-2) in 1 M KOH solution.Moreover,a small voltage of 1.52 V at 10 mA cm^(-2) is achieved when FeNi-Nd_(2)O_(3)/NCN is assessed as bifunctional catalyst for overall water splitting,which is superior to the typically integrated Pt/C and RuO_(2) counterparts(1.54 V at 10 mA cm^(-2)).The related characterizations including X-ray absorption fine structure(XAFS)spectroscopy show that the remarkably improved activity is originated from Nd_(2)O_(3)-induced FeNi bimetallic lattice contraction.Furthermore,density functional theory(DFT) calculations indicate that the lattice contraction reduces binding energies of intermediates by downshifting the position of FeNi bimetallic d-band center relative to the Fermi level to optimize catalytic performance.Therefore,the Nd_(2)O_(3)-induced FeNi bimetallic lattice contraction may provide a new perspective for designing and synthesizing innovative catalytic systems.

关 键 词：Bifunctional catalyst FeNi-Nd_(2)O_(3)hetero-trimers Lattice contraction Overall water splitting 

分 类 号：TQ116.2[化学工程—无机化工] TQ426