Lookup NU author(s): Dr Stevin Pramana
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The potential of water (photo)electrolysis technology to provide hydrogen as a fuel on a large scale depends on how viable electrocatalysts for the water oxidation reaction (WOR) and the hydrogen evolution reaction (HER) are and whether they can be constructed from elements which are abundant in the Earth's crust. Here we show that ternary sulfides of cobalt-tungsten and nickel-tungsten (MWSx where M is Co or Ni) are efficient and robust electrocatalysts for the HER in water over a wide pH range. These novel ternary sulfides were readily grown on a conducting electrode surface by employing a scalable electrodeposition process from aqueous solutions of [M(WS4) 2]2-. In terms of HER activity, the MWSx catalysts represent attractive alternatives to platinum. Moreover, we show that the HER activity is governed by the nature of the metal M within M-S-W heterobimetallic sulfide centres, located in the WS2-like layered structure of MWSx. Our work provides structural and mechanistic keys to understand how HER activity is promoted in previously described nickel and cobalt-doped molybdenum and tungsten sulfide materials. © 2013 The Royal Society of Chemistry.
Author(s): Tran PD, Chiam SY, Boix PP, Ren Y, Pramana SS, Fize J, Artero V, Barber J
Publication type: Article
Publication status: Published
Journal: Energy and Environmental Science
Print publication date: 01/08/2013
Online publication date: 11/06/2013
ISSN (print): 1754-5692
ISSN (electronic): 1754-5706
Publisher: Royal Society of Chemistry
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