Zero-Gap Bipolar Membrane Electrolyzer for Carbon DioxideReduction Using Acid-Tolerant Molecular Electrocatalysts



Siritanaratkul, Bhavin, Forster, Mark, Greenwell, Francesca, Sharma, Preetam K, Yu, Eileen H and Cowan, Alexander J
(2022) Zero-Gap Bipolar Membrane Electrolyzer for Carbon DioxideReduction Using Acid-Tolerant Molecular Electrocatalysts. JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, 144 (17). pp. 7551-7556.

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Abstract

The scaling-up of electrochemical CO<sub>2</sub> reduction requires circumventing the CO<sub>2</sub> loss as carbonates under alkaline conditions. Zero-gap cell configurations with a reverse-bias bipolar membrane (BPM) represent a possible solution, but the catalyst layer in direct contact with the acidic environment of a BPM usually leads to H<sub>2</sub> evolution dominating. Here we show that using acid-tolerant Ni molecular electrocatalysts selective (>60%) CO<sub>2</sub> reduction can be achieved in a zero-gap BPM device using a pure water and CO<sub>2</sub> feed. At a higher current density (100 mA cm<sup>-2</sup>), CO selectivity decreases, but was still >30%, due to reversible product inhibition. This study demonstrates the importance of developing acid-tolerant catalysts for use in large-scale CO<sub>2</sub> reduction devices.

Item Type: Article
Uncontrolled Keywords: 40 Engineering, 34 Chemical Sciences, 4018 Nanotechnology
Divisions: Faculty of Science and Engineering > School of Physical Sciences
Depositing User: Symplectic Admin
Date Deposited: 21 Apr 2022 07:58
Last Modified: 20 Jun 2024 16:59
DOI: 10.1021/jacs.1c13024
Related URLs:
URI: https://livrepository.liverpool.ac.uk/id/eprint/3153471