Trifunctional robust electrocatalysts based on 3D Fe/N-doped carbon nanocubes encapsulating Co4N nanoparticles for efficient battery-powered water electrolyzers  

作　　者：Hyung Wook Choi Hongdae Lee Jun Lu Seok Bin Kwon Dong In Jeong Beum Jin Park Jiwon Kim Bong Kyun Kang Gun Jang Dae Ho Yoon Ho Seok Park 

机构地区：[1]SKKU Advanced Institute of Nano Technology(SAINT),Sungkyunkwan University,Suwon-si,Gyeonggi-do,Republic of Korea [2]School of Chemical Engineering,Sungkyunkwan University,Suwon-si,Gyeonggi-do,Republic of Korea [3]School of Advanced Materials Science and Engineering,Sungkyunkwan University,Suwon-si,Gyeonggi-do,Republic of Korea [4]Department of Electronic Materials,Devices,and Equipment Engineering,Soonchunhyang University,Asan City,Chungnam,Republic of Korea [5]SKKU Institute of Energy Science and Technology(SIEST),Sungkyunkwan University,Suwon-si,Gyeonggi-do,Republic of Korea [6]Department of Health Sciences and Technology,Samsung Advanced Institute for Health Sciences and Technology(SAIHST),Sungkyunkwan University,Suwon,Republic of Korea

出　　处：《Carbon Energy》2024年第6期124-139,共16页碳能源（英文）

基　　金：National Research Foundation of Korea,Grant/Award Numbers:NRF-2020R1A3B2079803,2021R1A2C2007804。

摘　　要：Herein,we have designed a highly active and robust trifunctional electrocatalyst derived from Prussian blue analogs,where Co_(4)N nanoparticles are encapsulated by Fe embedded in N-doped carbon nanocubes to synthesize hierarchically structured Co_(4)N@Fe/N-C for rechargeable zinc-air batteries and overall water-splitting electrolyzers.As confirmed by theoretical and experimental results,the high intrinsic oxygen reduction reaction,oxygen evolution reaction,and hydrogen evolution reaction activities of Co_(4)N@Fe/N-C were attributed to the formation of the heterointerface and the modulated local electronic structure.Moreover,Co_(4)N@Fe/N-C induced improvement in these trifunctional electrocatalytic activities owing to the hierarchical hollow nanocube structure,uniform distribution of Co_(4)N,and conductive encapsulation by Fe/N-C.Thus,the rechargeable zinc-air battery with Co_(4)N@Fe/N-C delivers a high specific capacity of 789.9 mAh g^(-1) and stable voltage profiles over 500 cycles.Furthermore,the overall water electrolyzer with Co_(4)N@Fe/N-C achieved better durability and rate performance than that with the Pt/C and IrO2 catalysts,delivering a high Faradaic efficiency of 96.4%.Along with the great potential of the integrated water electrolyzer powered by a zinc-air battery for practical applications,therefore,the mechanistic understanding and active site identification provide valuable insights into the rational design of advanced multifunctional electrocatalysts for energy storage and conversion.

关 键 词：battery-powered electrolyzers hierarchical structure Prussian blue analog trifunctional electrocatalyst zinc-air battery 

分 类 号：O646[理学—物理化学] TM91[理学—化学]