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Issue 21, 2018
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An overall water-splitting polyoxometalate catalyst for the electromicrobial conversion of CO2 in neutral water

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Abstract

Electromicrobial conversion of carbon dioxide is a promising alternative to the direct transfer of CO2 into biomass by using bacteria that consume hydrogen and CO2 for living. The efficiency of such a hybrid system strongly depends on the electrocatalyst used for hydrogen production. Here we evidence that a mixed noble metal free Co/Cu-containing polyoxometalate/Carbon Cloth (Cu6Co7/CC) hybrid possesses excellent activity as a water splitting pre-electrocatalyst at neutral pH, with Hydrogen Evolution Reaction (HER) and Oxygen Evolution Reaction (OER) overpotentials of 390 mV and 500 mV at 10 mA cm−2 and Tafel slopes of 96 mV dec−1 and 147 mV dec−1, respectively. The nature of the catalysts involved for both the oxidation and reduction processes has been investigated. The long-term activity of the electrodes is also demonstrated. A negligible amount of H2O2 is produced during the electrolysis process. CO2 fixation with wild-type R. eutropha and the biocompatible Cu6Co7/CC precatalyst as both anode and cathode materials has been tested. The hydrogen produced on the cathode is consumed by the bacteria for living and growth with more than 50% of input electrical energy transferred into biomass. The solar-to-biomass efficiency ηSCE can reach 9.9 ± 0.5% in a 6-day experiment, almost 10 times higher than those of natural plants, showing the high performance of this Cu6Co7/CC/R. eutropha system.

Graphical abstract: An overall water-splitting polyoxometalate catalyst for the electromicrobial conversion of CO2 in neutral water

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Publication details

The article was received on 28 Feb 2018, accepted on 20 Apr 2018 and first published on 14 May 2018


Article type: Paper
DOI: 10.1039/C8TA01902A
Citation: J. Mater. Chem. A, 2018,6, 9915-9921
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    An overall water-splitting polyoxometalate catalyst for the electromicrobial conversion of CO2 in neutral water

    M. Wang, W. Zhong, S. Zhang, R. Liu, J. Xing and G. Zhang, J. Mater. Chem. A, 2018, 6, 9915
    DOI: 10.1039/C8TA01902A

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