Corresponding Author

Zuofeng Chen(zfchen@tongji.edu.cn)


Tin (Sn)-based materials have emerged as promising electrocatalysts for selective reduction of CO2 to formate, but their overall performances are still limited by electrode structures which govern the accessibility to active sites, the electron transfer kinetics, and the catalytic stability. In this study, the heterostructured Sn/SnO2 nanoparticles dispersed by N-doped carbon layer networks (Sn/SnO2@NC) were synthesized by a melt-recrystallization method taking the low melting point of Sn (m.p. 232oC). The N-doped carbon layer networks derived from polydopamine could attract more electrons on the electrocatalyst, serve as conductive agents and protect the ultrafine nanoparticles from agglomeration and dissolution. The Sn/SnO2@NC electrode exhibited the greatly enhanced performance for CO2 reduction to formate in CO2-saturated 0.5 mol·L-1 aqueous NaHCO3 solution, showing a selectivity of 83% at only -0.9 V vs. RHE with a sustained current density of 17 mA·cm-2 for extended periods. By coupling the catalytic electrode with a commercially available RuO2 catalyst as the anode, the long-term CO2/H2O splitting has been achieved. Furthermore, a rechargeable aqueous Zn-CO2 battery with Sn/SnO2@NC as the cathode and Zn foil as the anode was constructed. It could output electric energy with an open circuit voltage of 1.35 V and a peak power density of 0.9 mW·cm-2.

Graphical Abstract


CO2 electrochemical reduction, carbon layer networks, Sn/SnO2, formate, Zn-CO2 batteries

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