4.8 Article

Coupling CO2 reduction with CH3OH oxidation for efficient electrosynthesis of formate on hierarchical bifunctional CuSn alloy

期刊

NANO ENERGY
卷 98, 期 -, 页码 -

出版社

ELSEVIER
DOI: 10.1016/j.nanoen.2022.107277

关键词

Electrocatalysis; CO (2 )reduction; CH (3) OH oxidation; Formate production; CuSn alloy

资金

  1. National Key Research and Development Program of China [2017YFA0700104]
  2. National Natural Science Foundation of China [21905204, 21931007, 21790052, 21903060]
  3. 111 Project of China [D17003]

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A hierarchical bifunctional CuSn alloy electrocatalyst is developed for efficient production of formate through the simultaneous cathodic CO2RR and anodic MOR reactions, achieving a record-high production rate with nearly 100% selectivity. The coupling of CO2RR with MOR requires a lower electricity input compared to CO2RR coupled with conventional oxygen evolution reaction, making it a promising avenue for electrosynthesis.
It is a promising avenue for electrosynthesis of a single chemical at both cathode and anode, via concurrent CO2 reduction reaction (CO2RR) coupled with energy-efficient and value-added organic oxidation reaction, while present electrocatalysts suffer low production rate. Herein, for the first time, we report a hierarchical bifunctional CuSn alloy electrocatalyst for efficient production of a single formate via simultaneous cathodic CO2RR and anodic methanol oxidation reaction (MOR), achieving a record-high formate production rate of 3313 mu mol h(-1) cm(-2), with nearly 100% formate selectivity. Moreover, coupling CO2RR with MOR requires an electricity input of only 2.61 kWh kg(formate)(-1) , in contrast to the 4.46 kWh kg(formate)(-1)required for CO2RR coupled with conventional oxygen evolution reaction. DFT calculation results reveal that the calculated limiting potential for formate production is lower than those for CO and H-2 production on CuSn alloy, leading to the high selectivity for formate production.

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