Issue 29, 2023

A porous carbon membrane with abundant intrinsic carbon defects as an integrated gas-diffusion electrode for CO2 electroreduction

Abstract

A highly defective, self-supported porous carbon membrane (HDPCM) electrode is developed via CO2-assisted thermal etching of carbonized wood. The as-fabricated HDPCM is heteroatom-free and features abundant intrinsic carbon defects with enhanced CO2 adsorption and activation capability, and thus exhibits high efficiency for electrocatalytic CO2-to-CO conversion with a faradaic efficiency (FECO) of 81.1% and a partial current density (jCO) of −3.88 mA cm−2 at −0.66 V versus reversible hydrogen electrode (RHE). Notably, after hydrophobic treatment, the HDPCM can be directly used as an integrated gas-diffusion electrode (GDE) in the flow cell, further delivering a much enhanced and relatively stable jCO (−50 mA cm−2 at −0.76 V vs. RHE). This work not only contributes to an effective strategy for creating intrinsic defects on carbon-based electrocatalysts but also provides a new insight into the development of integrated metal-free carbon-based GDEs for large-scale CO2 electroreduction.

Graphical abstract: A porous carbon membrane with abundant intrinsic carbon defects as an integrated gas-diffusion electrode for CO2 electroreduction

Supplementary files

Article information

Article type
Communication
Submitted
26 May 2023
Accepted
01 Jul 2023
First published
03 Jul 2023

J. Mater. Chem. A, 2023,11, 15643-15650

A porous carbon membrane with abundant intrinsic carbon defects as an integrated gas-diffusion electrode for CO2 electroreduction

S. Min, H. Chang, H. Tao and F. Wang, J. Mater. Chem. A, 2023, 11, 15643 DOI: 10.1039/D3TA03109H

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