期刊
NANO-MICRO LETTERS
卷 14, 期 1, 页码 -出版社
SHANGHAI JIAO TONG UNIV PRESS
DOI: 10.1007/s40820-022-00953-y
关键词
Formate pair-electrolysis; Electrochemical CO2 reduction; Formaldehyde oxidation reaction; Membrane electrode assembly; Flow cell
资金
- National Key R&D Program of China [2020YFA0710000]
- National Natural Science Foundation of China [22122901, 21902047]
- Provincial Natural Science Foundation of Hunan [2020JJ5045, 2021JJ20024, 2021RC3054]
- Shenzhen Science and Technology Program [JCYJ20210324140610028]
A new electrochemical system combining cathodic CO2RR with anodic FOR was developed for formate electrosynthesis at ultra-low voltage, showing promising potential for high FE and low energy consumption in value-added chemicals synthesis.
Formate can be synthesized electrochemically by CO2 reduction reaction (CO2RR) or formaldehyde oxidation reaction (FOR). The CO2RR approach suffers from kinetic-sluggish oxygen evolution reaction at the anode. To this end, an electrochemical system combining cathodic CO2RR with anodic FOR was developed, which enables the formate electrosynthesis at ultra-low voltage. Cathodic CO2RR employing the BiOCl electrode in H-cell exhibited formate Faradaic efficiency (FE) higher than 90% within a wide potential range from - 0.48 to - 1.32 V-RHE. In flow cell, the current density of 100 mA cm(-2) was achieved at - 0.67 V-RHE. The anodic FOR using the Cu2O electrode displayed a low onset potential of - 0.13 V-RHE and nearly 100% formate and H-2 selectivity from 0.05 to 0.35 V-RHE. The CO2RR and FOR were constructed in a flow cell through membrane electrode assembly for the electrosynthesis of formate, where the CO2RR//FOR delivered an enhanced current density of 100 mA cm(-2) at 0.86 V. This work provides a promising pair-electrosynthesis of value-added chemicals with high FE and low energy consumption.
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