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The p‐Orbital Delocalization of Main‐Group Metals to Boost CO 2 Electroreduction
Author(s) -
He Sisi,
Ni Fenglou,
Ji Yujin,
Wang Lie,
Wen Yunzhou,
Bai Haipeng,
Liu Gejun,
Zhang Ye,
Li Youyong,
Zhang Bo,
Peng Huisheng
Publication year - 2018
Publication title -
angewandte chemie
Language(s) - English
Resource type - Journals
eISSN - 1521-3757
pISSN - 0044-8249
DOI - 10.1002/ange.201810538
Subject(s) - formate , catalysis , delocalized electron , chemistry , adsorption , inorganic chemistry , materials science , photochemistry , organic chemistry
Enhancing the p‐orbital delocalization of a Bi catalyst (termed as POD‐Bi) via layer coupling of the short inter‐layer Bi−Bi bond facilitates the adsorption of intermediate *OCHO of CO 2 and thus boosts the CO 2 reduction reaction (CO 2 RR) rate to formate. X‐ray absorption fine spectroscopy shows that the POD‐Bi catalyst has a shortened inter‐layer bond after the catalysts are electrochemically reduced in situ from original BiOCl nanosheets. The catalyst on a glassy carbon electrode exhibits a record current density of 57 mA cm −2 (twice the state‐of‐the‐art catalyst) at −1.16 V vs. RHE with an excellent formate Faradic efficiency (FE) of 95 %. The catalyst has a record half‐cell formate power conversion efficiency of 79 % at a current density of 100 mA cm −2 with 93 % formate FE when applied in a flow‐cell system. The highest rate of the CO 2 RR production reported (391 mg h −1 cm 2 ) was achieved at a current density of 500 mA cm −2 with formate FE of 91 % at high CO 2 pressure.