A Highly Effective, Stable Oxygen Evolution Catalyst Derived from Transition Metal Selenides and Phosphides

Recently, transition metal chalcogenides and phosphides have been increasingly reported as efficient and stable oxygen evolution reaction (OER) catalysts in alkaline medium, despite the fact that they are thermodynamically unstable under highly oxidative potentials. Here the active forms of these ma...

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Bibliographic Details
Published in:Particle & particle systems characterization 2018-08, Vol.35 (8), p.n/a
Main Authors: Bose, Ranjith, Jothi, Vasanth Rajendiran, Velusamy, Dhinesh Babu, Arunkumar, Paulraj, Yi, Sung Chul
Format: Article
Language:English
Subjects:
active species
alkaline medium
Catalysis
Catalysts
Chalcogenides
Chemical synthesis
Deactivation
Electrolysis
hybrid catalyst
Hydroxides
long‐term stability
oxygen evolution reaction
Oxygen evolution reactions
Phosphides
Selenides
Slope stability
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Summary:Recently, transition metal chalcogenides and phosphides have been increasingly reported as efficient and stable oxygen evolution reaction (OER) catalysts in alkaline medium, despite the fact that they are thermodynamically unstable under highly oxidative potentials. Here the active forms of these materials are elucidated by synthesizing a hybrid catalyst, which has a metal chalcogenide in the form of CoSe2 and metal phosphide in the form of CoP—CoSe2|CoP. Both CoSe2 and CoP in the as‐prepared catalyst are completely transformed into their respective oxyhydroxides and hydroxides, which are, in fact, the true OER‐active species in alkaline medium and not the selenide and phosphide themselves. The derived oxides from the hybrid catalyst deliver an excellent OER activity by reaching a current density of 10 mA cm−2 at a low overpotential of 240 mV (vs reversible hydrogen electrode (RHE)) and a Tafel slope of 46.6 mV dec−1. The stability of the derived oxyhydroxide/hydroxide catalyst shows no appreciable deactivation during 120 h of continuous electrolysis, displaying an extraordinary operational stability. In alkaline environments, Transition metal chalcogenides are unstable during oxygen evolution reaction and after an extended duration of oxidation even Transition metal phosphides are uncertain to exist. The derived oxyhydroxides and hydroxides from the Transition metal chalcogenides and phosphides act as the true oxygen evolution reaction active species.
ISSN:0934-0866
1521-4117
DOI:10.1002/ppsc.201800135