Promoting catalysis activity with optimizable self-generated Co-Fe alloy nanoparticles for efficient CO_(2)electrolysis performance upgrade  

作　　者：Kun Zhang Dong Zhang Yao Wang Yihang Li Cong Ren Mingyue Ding Tong Liu 

机构地区：[1]Key Laboratory of Hydraulic Machinery Transients(Wuhan University),Ministry of Education,School of Power and Mechanical Engineering,The Institute of Technological Sciences,Wuhan University,Wuhan 430072,China [2]Key Laboratory of Green Chemical Process of Ministry of Education,Hubei Key Laboratory of Novel Reactor and Green Chemical Technology,School of Chemical Engineering and Pharmacy,Wuhan Institute of Technology,Wuhan 430205,China [3]Interdisciplinary Research Center of Smart Sensors,Academy of Advanced Interdisciplinary Research,Xidian University,Xi’an 710071,China [4]Department of Applied Chemistry,School of Advanced Materials and Nanotechnology,Xidian University,Xi’an 710071,China

出　　处：《Nano Research》2023年第8期10992-10999,共8页纳米研究（英文版）

基　　金：supported by the National Natural Science Foundation of China(No.U21A20317);the National Key Research and Development Program of China(No.2022YFA1504701);the Fundamental Research Funds for the Central Universities(No.2042022gf0002);the start-up research funds from Wuhan Institute of Technology(No.K202201);Guangdong Basic and Applied Basic Research Foundation(No.2023A1515010429).

摘　　要：Stable and flexible metal nanoparticles(NPs)with regeneration ability are critical for long-term operation of solid oxide electrolysis cells(SOECs).Herein,a novel perovskite electrode with stoichiometric Pr_(0.4)Sr_(0.6)Co_(0.125)Fe_(0.75)Mo_(0.125)O_(3)−δ(PSFCM)is synthesized and studied,which undergoes multiple redox cycles to validate its structural stability and NPs reversibility.The Co-Fe alloy has exsolved from the parent bulk under reducing atmosphere,and is capable of reincorporation into the parent oxide after re-oxidation treatment.During the redox process,we successfully manipulate the size and population density of the exsolved NPs,and find that the average particle size significantly reduces but the population density increases correspondingly.The electrode polarization resistance of the symmetric cell remains stable for 450 h,and even activates after the redox cycling,which may be attributed to the higher quantity and larger specific surface area of the regenerated Co-Fe alloy NPs.Moreover,the electrochemical performance towards carbon dioxide reduction reaction(CO_(2)RR)is evaluated,and the CO_(2)electrolyzer consisting of CoFe@PSCFM-Ce_(0.8)Sm_(0.2)O_(1.9)(SDC)dual-phase electrode exhibits an excellent current density of 1.42 A·cm^(−2)at 1.6 V,which reaches 1.7 times higher than 0.83 A·cm^(−2)for the pristine PSCFM electrode.Overall,with this flexible and reversible high-performance SOEC cathode material,new options and perspectives are provided for the efficient and durable CO_(2)electrolysis.

关 键 词：redox stability in situ exsolution REGENERATION carbon dioxide reduction reaction PEROVSKITE 

分 类 号：TB383[一般工业技术—材料科学与工程]