法拉第效率
催化作用
电化学
膜
材料科学
化学工程
阴极
多孔性
吉布斯自由能
碳纤维
电流密度
金属
兴奋剂
纳米技术
无机化学
化学
电极
物理化学
有机化学
热力学
物理
工程类
复合数
量子力学
复合材料
冶金
生物化学
光电子学
作者
Hengpan Yang,Yu Wu,Qing Lin,Liangdong Fan,Xiang Chai,Qianling Zhang,Jianhong Liu,Chuanxin He,Zhiqun Lin
标识
DOI:10.1002/anie.201809255
摘要
Abstract A facile route to scalable production of N and S co‐doped, hierarchically porous carbon nanofiber (NSHCF) membranes (ca. 400 cm 2 membrane in a single process) is reported. As‐synthesized NSHCF membranes are flexible and free‐standing, allowing their direct use as cathodes for efficient electrochemical CO 2 reduction reaction (CO 2 RR). Notably, CO with 94 % Faradaic efficiency and −103 mA cm −2 current density are readily achieved with only about 1.2 mg catalyst loading, which are among the best results ever obtained by metal‐free CO 2 RR catalysts. On the basis of control experiments and DFT calculations, such outstanding CO Faradaic efficiency can be attributed to the co‐doped pyridinic N and carbon‐bonded S atoms, which effectively decrease the Gibbs free energy of key *COOH intermediate. Furthermore, hierarchically porous structures of NSHCF membranes impart a much higher density of accessible active sites for CO 2 RR, leading to the ultra‐high current density.
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