Defective wood-based chainmail electrocatalysts boost performances of seawater-medium Zn-air batteries  

作　　者：Zhonghao Chen Hongjiao Chen Teng Li Xing Tian Kewei Zhang Yijun Miao Changlei Xia Liping Cai Bin Hui Chaoji Chen 

机构地区：[1]State Key Laboratory of Bio-Fibers and Eco-Textiles,Shandong Collaborative Innovation Center of Marine Biobased Fiber and Ecological Textile,Institute of Marine Biobased Materials,School of Materials Science and Engineering,Qingdao University,Qingdao 266071,Shandong,China [2]College of Materials Science and Engineering,Nanjing Forestry University,Nanjing 210037,Jiangsu,China [3]Hubei Biomass-Resource Chemistry and Environmental Biotechnology Key Laboratory,Hubei Provincial Engineering Research Center of Emerging Functional Coating Materials,School of Resource and Environmental Sciences,Wuhan University,Wuhan 430079,Hubei,China

出　　处：《Journal of Energy Chemistry》2025年第3期134-143,共10页能源化学(英文版)

基　　金：financial support by the Excellent Youth Foundation of Shandong Province(No.ZR2022YQ22);National Natural Science Foundation of China(No.32101451);Youth Innovation Team Project of Shandong Province(No.2022KJ303)。

摘　　要：A high-activity and stable bifunctional oxygen reduction reaction(ORR)and oxygen evolution reaction(OER)electrocatalyst is critical for seawater-based Zn-air batteries(ZABs).Herein,we report a wood-derived chainmail electrocatalyst containing defective nitrogen-doped carbon nanotubes encapsulating cobalt nanoparticles(Co@D-NCNT/CW)to enhance the ORR/OER activity and stability in seawater medium.During the preparation process,the introduction and removal of Zn increased the defect sites and pyridine N content in the carbon material,modulating charge distribution and influencing the adsorption and activation processes.The highly ordered open channels in Co@D-NCNT/CW promoted mass transfer of reactants and accelerated gas diffusion.The resultant chainmail electrocatalyst exhibited impressive bifunctional ORR and OER activities with an ultra-low gap of 0.67 V in sea water-based alkaline electrolyte.The Co@D-NCNT/CW-assembled seawater-based rechargeable liquid ZABs demonstrated a maximum power density of 245.3 mW cm^(-2)and a long-term cycling performance over 500 h.The seawater-based all-solid-state ZABs achieved the maximum power density of 48.2 mW cm^(-2)and stabilized over 30 h.Density functional theory revealed that the presence of defects and pyridine nitrogen in Co@D-NCNT/CW modulated the electronic structure of Co,optimizing the binding affinity of the Co sites with intermediates and weakening Cl^(-)adsorption.This work provides a new approach to preparing high-activity and stable ORR/OER electrocatalyst utilizing wood nanostructures,boosting the development of seawater-based ZABs.

关 键 词：Wood nanostructures Chainmail electrocatalyst Defects Bifunctional oxygen reduction/evolution reactions Zn-air battery 

分 类 号：TM911.4[电气工程—电力电子与电力传动] TM911.41