首页|Single-atom Co-N4 catalytic sites anchored on N-doped ordered mesoporous carbon for excellent Zn-air batteries
Single-atom Co-N4 catalytic sites anchored on N-doped ordered mesoporous carbon for excellent Zn-air batteries
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Developing efficient transition metal-nitrogen-carbon(TM-N-C)catalysts with abundant accessible active sites has been in the limelight in recent years due to their exceptional application potential in Zn-air bat-teries(ZABs).Herein,we report the simple and environmentally-friendly fabrication of a single-atom Co electrocatalyst,Co-SA/N-C900,via in-suit pyrolysis of the co-precursor containing sucrose,dicyandiamide,and Co salts.The Co single atoms coordinated with adjacent N atoms are anchored on the doped ordered mesoporous carbon,generating the atomic Co-N4 moiety.Co-SA/N-C900 displays high oxygen reduction reaction(ORR)activity with an onset potential of 0.96 V and a half-wave potential of 0.87 V.Notably,the liquid ZAB with Co-SA/N-C900 catalyst exhibits exceptional discharge specific capacity of 706.38 mAh g-1,peak power density of 191.11 mW cm-2,and excellent stability at high current densities up to 100 mA cm-2,surpassing commercial Pt/C.According to the density functional theory(DFT)study,the C0-N4 moi-ety with graphitic N dopants can decrease the rate-determining step(RDS)energy barrier and thus accel-erate the ORR process.This study offers experimental and theoretical guidelines for the rational design of TM-N-C catalysts for practical implementation with notable ORR activity for application in ZABs.
Single-atom electrocatalystCo-N4 active sitesOxygen reduction reactionZn-air batteryDFT study
Na Li、Le Li、Jiawei Xia、Muhammad Arif、Shilong Zhou、Fengxiang Yin、Guangyu He、Haiqun Chen
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Key Laboratory of Advanced Catalytic Materials and Technology,Advanced Catalysis and Green Manufacturing Collaborative Innovation Center,Changzhou University,Changzhou 213164,China
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