石墨烯负载单原子钴催化剂的制备及其电催化二氧化碳还原反应性能

CoN₄ active sites in a graphene matrix for the highly efficient electrocatalysis of CO₂ reduction

摘要: 设计高选择性、稳定和低成本的催化剂将二氧化碳电化学转化为高附加值的碳产品以缓解二氧化碳排放和能源危机仍是一个挑战。通过将单原子CoN₄活性位点嵌入石墨烯基体中得到了一种强健和高效的CO₂还原电催化剂。结果表明，这些高度分散的CoN₄位点具有出色的CO₂还原活性，在电压为−0.76 V (vs. RHE)，过电位为0.65 V时，CO法拉第效率达~95%。同时，该催化剂具有优异的稳定性。本工作为设计高效CO₂还原电催化剂奠定了基础。

Abstract: Developing highly selective, economical and stable catalysts for the electrochemical conversion of CO₂ into value-added carbon products to mitigate both CO₂ emission and the energy crisis is challenging. We report an efficient and robust electrocatalyst for the CO₂ reduction reaction (CO₂RR) by embedding CoN₄ active sites in a graphene matrix. These highly dispersed CoN₄ sites show an extraordinary CO₂RR activity, with a high CO Faradaic efficiency of nearly 95% at −0.76 V (vs. RHE) and remarkable durability. The corresponding overpotential is 0.65 V. Our finding could pave the way for the design at the atomic scale of highly efficient electrocatalysts for the CO₂RR.