格式化
材料科学
法拉第效率
电化学
扫描透射电子显微镜
催化作用
光电子学
纳米技术
透射电子显微镜
化学
电极
物理化学
生物化学
作者
Lili Han,Xianyun Peng,Hsiao‐Tsu Wang,Pengfei Ou,Yuying Mi,Chih‐Wen Pao,Jigang Zhou,Jian Wang,Xijun Liu,Way‐Faung Pong,Jun Song,Zhang Lin,Jun Luo,Huolin L. Xin
标识
DOI:10.1073/pnas.2207326119
摘要
Electrochemical conversion of CO2 into formate is a promising strategy for mitigating the energy and environmental crisis, but simultaneously achieving high selectivity and activity of electrocatalysts remains challenging. Here, we report low-dimensional SnO2 quantum dots chemically coupled with ultrathin Ti3C2Tx MXene nanosheets (SnO2/MXene) that boost the CO2 conversion. The coupling structure is well visualized and verified by high-resolution electron tomography together with nanoscale scanning transmission X-ray microscopy and ptychography imaging. The catalyst achieves a large partial current density of -57.8 mA cm-2 and high Faradaic efficiency of 94% for formate formation. Additionally, the SnO2/MXene cathode shows excellent Zn-CO2 battery performance, with a maximum power density of 4.28 mW cm-2, an open-circuit voltage of 0.83 V, and superior rechargeability of 60 h. In situ X-ray absorption spectroscopy analysis and first-principles calculations reveal that this remarkable performance is attributed to the unique and stable structure of the SnO2/MXene, which can significantly reduce the reaction energy of CO2 hydrogenation to formate by increasing the surface coverage of adsorbed hydrogen.
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