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Main Title: Detecting structural transformation of cobalt phosphonate to active bifunctional catalysts for electrochemical water-splitting
Author(s): Indra, Arindam
Menezes, Prashanth W.
Zaharieva, Ivelina
Dau, Holger
Drieß, Matthias
Type: Article
Language Code: en
Abstract: In recent years, several cobalt-based catalysts have been developed for water splitting because of their promising activity, stability and structural motifs. Here, we report that cobalt phosphonate represents a novel class of bifunctional single-source precursors for highly efficient alkaline electrochemical O2 evolution (OER) and H2 evolution reaction (HER). Inspired by its favorable catalytic OER and HER activity, an overall water-splitting device has been constructed from this precursor, showing very low cell voltage (1.62 V @ 10 mA cm−2) and excellent long-term stability. Depending on the applied oxidation and reduction potential on cobalt phosphonate, two distinct modified structures at the anode and cathode have been uncovered employing the quasi in situ X-ray absorption spectroscopy and ex situ methods. During OER, the phosphonate precursor reorganized itself to layered CoOx(OH)y structure with defects and disorders, while the contribution of the metallic Co along with Co3O4 spinel and Co(OH)2 is evident to drive the HER. The presented work demonstrates the advantage of using the ‘all-in-one’ precursor approach to realize bifunctional water-splitting electrocatalysts through the evolution of different species with self-supporting interfacial structural features at the anode and cathode during electrochemical water splitting.
Issue Date: 7-Jan-2020
Date Available: 22-Apr-2020
DDC Class: 540 Chemie und zugeordnete Wissenschaften
Subject(s): catalysts
cobalt phosphonate
overall water-splitting device
alkaline media
O2 evolution reaction
H2 evolution reaction
Sponsor/Funder: TU Berlin, Open-Access-Mittel - 2020
DFG, 390540038, EXC 2008: UniSysCat
Journal Title: Journal of Materials Chemistry A
Publisher: RSC Publishing
Publisher Place: London
Volume: 8
Publisher DOI: 10.1039/C9TA09775A
Page Start: 2637
Page End: 2643
EISSN: 2050-7496
ISSN: 2050-7488
Appears in Collections:FG Metallorganische Chemie und Anorganische Materialien » Publications

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