Use of the transition-metal single atomsupported by carbon is an innovative technique that enhances the electrocatalytic behavior of the oxygen reduction reaction(ORR)for Zn-air batteries(ZABs).Yet,building such catal...Use of the transition-metal single atomsupported by carbon is an innovative technique that enhances the electrocatalytic behavior of the oxygen reduction reaction(ORR)for Zn-air batteries(ZABs).Yet,building such catalysts with stable and efficient electron/mass transport pathways,as well as high catalytic activity and stability remains a critical challenge.Here,we develop a hierarchically porous biomass carbon to anchor atomically dispersed Co atoms,simultaneously addressing the active sites’emergence and stability,and electron/mass transit.The optimum catalyst achieves fabulous electrocatalytic behavior with a half-wave potential of 0.82 V for ORR.More impressively,the ZAB with its well-tailored catalyst exhibits extraordinary combined performance,including a high zenith power density of 139.89mW·cm^(−2),outstanding specific capacity,and remarkable rate durability.This rational design strategy can be applied to create high-efficiency and inexpensive electrocatalysts for sustainable energy conversion and storage devices.展开更多
基金This research was made possible by the financial support by the National Natural Science Foundation of Shandong,China(grant nos.ZR2020JQ21 and ZR2021ZD24)the National Natural Science Foundation of China(grant nos.51873231 and 22138013)the Taishan Scholar Project of Shandong,China(grant no.tsqn201909062).
文摘Use of the transition-metal single atomsupported by carbon is an innovative technique that enhances the electrocatalytic behavior of the oxygen reduction reaction(ORR)for Zn-air batteries(ZABs).Yet,building such catalysts with stable and efficient electron/mass transport pathways,as well as high catalytic activity and stability remains a critical challenge.Here,we develop a hierarchically porous biomass carbon to anchor atomically dispersed Co atoms,simultaneously addressing the active sites’emergence and stability,and electron/mass transit.The optimum catalyst achieves fabulous electrocatalytic behavior with a half-wave potential of 0.82 V for ORR.More impressively,the ZAB with its well-tailored catalyst exhibits extraordinary combined performance,including a high zenith power density of 139.89mW·cm^(−2),outstanding specific capacity,and remarkable rate durability.This rational design strategy can be applied to create high-efficiency and inexpensive electrocatalysts for sustainable energy conversion and storage devices.
