文献类型：期刊文献

英文题名：Operando High-Valence Cr-Modified NiFe Hydroxides for Water Oxidation

作者：Wang, Ming Hua[1];Lou, Zhen Xin[1];Wu, Xuefeng[1];Liu, Yuanwei[1];Zhao, Jia Yue[1];Sun, Kai Zhi[1];Li, Wen Xin[2];Chen, Jiacheng[3];Yuan, Hai Yang[1];Zhu, Minghui[3];Dai, Sheng[4,5];Liu, Peng Fei[1];Yang, Hua Gui[1]

机构：[1]East China Univ Sci & Technol, Sch Mat Sci & Engn, Key Lab Ultrafine Mat, Minist Educ,Shanghai Engn Res Ctr Hierarch Nanoma, Shanghai 200237, Peoples R China;[2]Shihezi Univ, Key Lab Green Proc Chem Engn Xinjiang Bingtuan, Key Lab Mat Oriented Chem Engn Xinjiang Uygur Aut, Sch Chem & Chem Engn,Engn Res Ctr Mat Oriented Ch, Xinjiang 832003, Peoples R China;[3]East China Univ Sci & Technol, Sch Chem Engn, State Key Lab Chem Engn, Shanghai 200237, Peoples R China;[4]East China Univ Sci & Technol, Key Lab Adv Mat, Inst Fine Chem, Sch Chem & Mol Engn, Shanghai 200237, Peoples R China;[5]East China Univ Sci & Technol, Feringa Nobel Prize Scientist Joint Res Ctr, Inst Fine Chem, Sch Chem & Mol Engn, Shanghai 200237, Peoples R China

年份：2022

卷号：18

期号：19

外文期刊名：SMALL

收录：;EI(收录号：20221511936628);WOS:【SCI-EXPANDED(收录号:WOS:000778966200001)】；

基金：This work was financially supported by National Natural Science Funds for Distinguished Young Scholars (51725201), International (Regional) Cooperation and Exchange Projects of the National Natural Science Foundation of China (51920105003), Innovation Program of Shanghai Municipal Education Commission (E00014), the Science and Technology Commission of Shanghai Municipality (21DZ1207101, 19YF1411600), the National Natural Science Foundation of China (51902105, 21902048), the Fundamental Research Funds for the Central Universities, National Postdoctoral Program for Innovative Talents (BX20190113), and Shanghai Engineering Research Center of Hierarchical Nanomaterials (18DZ2252400). Additional support was provided by the Feringa Nobel Prize Scientist Joint Research Center. The authors also thank the Frontiers Science Center for Materiobiology and Dynamic Chemistry, and crew of BL14W1 beamline at the Shanghai Synchrotron Radiation Facility (SSRF) and 1W1B beamline at the Beijing Synchrotron Radiation Facility (BSRF) for the constructive assistance in the XAFS measurements and data analysis.

语种：英文

外文关键词：anion exchange membrane; multimetal (oxy)hydroxides; operando high-valence dopants; oxygen evolution reaction

摘要：High-valence metal-doped multimetal (oxy)hydroxides outperform noble metal electrocatalysts for the oxygen evolution reaction (OER) owing to the modified energetics between 3d metals and high-valence dopants. However, the rational design of sufficient and subtle modulators is still challenging. With a multimetal layered double hydroxide (LDH) as the OER catalyst, this study introduces a series of operando high-valence dopants (Cr, Ru, Ce, and V), which can restrict the 3+ valence states in the LDH template to prevent phase separation and operando transfer to the >3+ valence states for sufficient electronic interaction during the OER process. Through density functional theory simulations, ultrathin Cr-doped NiFe (NiFeCr) LDH is synthesized with strong electronic interaction between Cr dopants and NiFe bimetallic sites, evidenced by X-ray absorption spectroscopy. The resulting NiFeCr-LDH catalyzes the OER with ultralow overpotentials of 189 and 284 mV, obtaining current densities of 10 and 1000 mA cm(-2), respectively. Further, a NiFeCr-LDH anode is coupled in the anion exchange membrane electrolyzers to promote alkaline water splitting and CO2-to-CO electrolysis, which achieves low full cell voltages at high current densities.