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CoOx(OH)y/C nanocomposites in situ derived from Na4Co3(PO4)2P2O7 as sustainable electrocatalysts for water splitting

Abstract

Great interest in the creation of efficient and stable bifunctional electrodes for electrocatalytic water splitting is due to the rapid growth of demand for sustainable and renewable energy sources. Here, we present an original electrode design strategy which can be successfully used as for oxygen evolution reaction (OER) and for hydrogen evolution reaction (HER). This strategy is based on the direct formation of active catalytic material onto electrode surface during the electrolysis process. In our case, cobalt hydroxides (β-Co(OH)2 and CoO(OH) for HER and OER, respectively) in carbon matrix are the result of chemical and electrochemical transformation of various (glass, glass-ceramic and polycrystalline) forms of Na4Co3(PO4)2P2O7 during electrolysis process in 1M NaOH solution. Obtained CoOx(OH)y/C composites demonstrate remarkable stable-in-time (more than 50 hours) bifunctional catalytic activity with value of overall water splitting potential close to 1.8 V at current density of 10 mA·cm-2 (the range of overpotentials for OER and HER is 346-365 and 326-369 mV, respectively). These electrodes have shown the ability to overall inversion of OER and HER processes with total overpotential of 0.6 V in the cell. This remarkable feature of CoO(OH) ↔ Co(OH)2 inversion in the carbon matrix points out to additional possibilities in creation of bifunctional electrodes for long-life water splitting cells.

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Publication details

The article was received on 04 Sep 2018, accepted on 04 Oct 2018 and first published on 09 Oct 2018


Article type: Paper
DOI: 10.1039/C8DT03593H
Citation: Dalton Trans., 2018, Accepted Manuscript
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    CoOx(OH)y/C nanocomposites in situ derived from Na4Co3(PO4)2P2O7 as sustainable electrocatalysts for water splitting

    I. V. Odynets, N. Yu. Strutynska, J. Li, W. Han, I. Zatovsky and N. I. Klyui, Dalton Trans., 2018, Accepted Manuscript , DOI: 10.1039/C8DT03593H

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