Transition-Metal-Doped RuIr Bifunctional Nanocrystals for Overall Water Splitting in Acidic Environments

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review

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Detail(s)

Original languageEnglish
Article number1900510
Journal / PublicationAdvanced Materials
Volume31
Issue number17
Publication statusPublished - 25 Apr 2019
Externally publishedYes

Abstract

The establishment of electrocatalysts with bifunctionality for efficient oxygen evolution reaction (OER) and hydrogen evolution reaction (HER) in acidic environments is necessary for the development of proton exchange membrane (PEM) water electrolyzers for the production of clean hydrogen fuel. RuIr alloy is considered to be a promising electrocatalyst because of its favorable OER performance and potential for HER. Here, the design of a bifunctional electrocatalyst with greatly boosted water-splitting performance from doping RuIr alloy nanocrystals with transition metals that modify electronic structure and binding strength of reaction intermediates is reported. Significantly, Co-RuIr results in small overpotentials of 235 mV for OER and 14 mV for HER (@ 10 mA cm <sup>−2</sup> current density) in 0.1 m HClO <sub>4</sub> media. Therefore a cell voltage of just 1.52 V is needed for overall water splitting to produce hydrogen and oxygen. More importantly, for a series of M-RuIr (M = Co, Ni, Fe), the catalytic activity dependence at fundamental level on the chemical/valence states is used to establish a novel composition-activity relationship. This permits new design principles for bifunctional electrocatalysts. © 2019 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim

Research Area(s)

  • acidic environment, bifunctional electrocatalysis, composition-activity relationship, overall water splitting, transition metal doping

Bibliographic Note

Publication details (e.g. title, author(s), publication statuses and dates) are captured on an “AS IS” and “AS AVAILABLE” basis at the time of record harvesting from the data source. Suggestions for further amendments or supplementary information can be sent to [email protected].

Citation Format(s)

Transition-Metal-Doped RuIr Bifunctional Nanocrystals for Overall Water Splitting in Acidic Environments. / Shan, Jieqiong; Ling, Tao; Davey, Kenneth et al.
In: Advanced Materials, Vol. 31, No. 17, 1900510, 25.04.2019.

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review