Practical operating flexibility of a bifunctional freestanding membrane for efficient anion exchange membrane water electrolysis across all current ranges  

作　　者：Hong-Jin Son Jeemin Hwang Min Young Choi Seung Hee Park Jae Hyuk Jang Byungchan Han Sung Hoon Ahn 

机构地区：[1]Department of Bio-Chemical Engineering,Chosun University,Gwangju,Republic of Korea [2]Fuel Cell Research and Demonstration Center,Hydrogen Energy Research Division,Korea Institute of Energy Research(KIER),Buan-gun,Jeollabuk-do,Republic of Korea [3]Department of Chemical and Biomolecular Engineering,Yonsei University,Seoul,Republic of Korea [4]Center for Research Equipment,Korea Basic Science Institute,Daejeon,Republic of Korea

出　　处：《Carbon Energy》2024年第9期306-324,共19页碳能源（英文）

基　　金：This research was supported by the“Regional Innovation Strategy(RIS)”through the National Research Foundation of Korea(NRF)funded by the Ministry of Education(MOE)(2021RIS-002);This work was supported by an NRF grant funded by the Ministry of Science,ICT,and Future Planning(No.NRF-2018R1C1B6005009,NRF-2021R1C1C1012676,and 2009-0082580).

摘　　要：This study explores a symmetric configuration approach in anion exchange membrane(AEM)water electrolysis,focusing on overcoming adaptability challenges in dynamic conditions.Here,a rapid and mild synthesis technique for fabricating fibrous membrane-type catalyst electrodes is developed.Our method leverages the contrasting oxidation states between the sulfur-doped NiFe(OH)_(2) shell and the metallic Ni core,as revealed by electron energy loss spectroscopy.Theoretical evaluations confirm that the S–NiFe(OH)_(2) active sites optimize free energy for alkaline water electrolysis intermediates.This technique bypasses traditional energy-intensive processes,achieving superior bifunctional activity beyond current benchmarks.The symmetric AEM water electrolyzer demonstrates a current density of 2 A cm^(-2) at 1.78 V at 60℃ in 1 M KOH electrolyte and also sustains ampere-scale water electrolysis below 2.0 V for 140 h even in ambient conditions.These results highlight the system's operational flexibility and structural stability,marking a significant advance-ment in AEM water electrolysis technology.

关 键 词：AEM water electrolysis fibrous membrane iR correction free operational stability symmetric configuration 

分 类 号：O64[理学—物理化学]