Metal‐Organic‐Framework‐Derived Bismuth Nanosheets for Electrochemical and Solar‐Driven Electrochemical CO 2 Reduction to Formate

Electrochemical CO 2 reduction is a promising way to achieve CO 2 fixation and energy storage. However, it is a challenge to develop the potential electrocatalysts with excellent performance and selectivity. Herein, bismuth nanosheet arrays (Bi/CC‐17) are prepared through an in situ electrochemical transformation strategy by use of Bi‐based metal organic frameworks (MOFs) as the precursors, which are then attached on carbon cloth. The as‐synthesized Bi/CC‐17 nanosheet arrays achieve considerable partial current density of 45 mA cm −2 and remarkably high faradic efficiency of 98 % at the potential of −1.1 V versus RHE for the conversion of CO 2 to formate, outperforming most previously reported electrocatalysts. In particular, the solar‐driven In 2 O 3 /In 2 S 3 ∥Bi two‐electrode system with a In 2 O 3 /In 2 S 3 ‐based photoanode and typical Bi‐based cathode achieves high faradaic efficiencies of ≥90 % for HCOOH formation, from −0.6 to −1.6 V versus the counter electrode (vs. CE). This work paves an avenue to develop MOF‐derived electrocatalysts for sustainable conversion of CO 2 into valuable chemicals.