Formation of open ruthenium branched structures with highly exposed active sites for oxygen evolution reaction electrocatalysis

Sa Xiao; Yuhan Xie; Agus R. Poerwoprajitno; Lucy Gloag; Qinyu Li; Soshan Cheong; Zeno R. Ramadhan; Ingemar Persson; Yoshiki Soda; Dale L. Huber; Liming Dai; J. Justin Gooding; Richard D. Tilley

doi:10.1039/D5SC01861G

Formation of open ruthenium branched structures with highly exposed active sites for oxygen evolution reaction electrocatalysis†

Sa Xiao,

^a Yuhan Xie,^a Agus R. Poerwoprajitno,

^b Lucy Gloag,^c Qinyu Li,

^a Soshan Cheong,

^d Zeno R. Ramadhan,

^a Ingemar Persson,^a Yoshiki Soda,^a Dale L. Huber,

^b Liming Dai,

^e J. Justin Gooding

*^af and Richard D. Tilley

*^adf

Author affiliations

* Corresponding authors

^a School of Chemistry, The University of New South Wales, Sydney, NSW 2052, Australia
E-mail: justin.gooding@unsw.edu.au, r.tilley@unsw.edu.au

^b Center for Integrated Nanotechnologies, Sandia National Laboratories, Albuquerque, NM 87185, USA

^c Research School of Chemistry, The Australian National University, Canberra, ACT 2601, Australia

^d Mark Wainwright Analytical Centre, The University of New South Wales, Sydney, NSW, Australia

^e School of Chemical Engineering, The University of New South Wales, Sydney, NSW, Australia

^f Australian Centre for NanoMedicine, The University of New South Wales, Sydney, NSW, Australia

Abstract

The formation of exposed active sites that have high activity and stability for oxygen evolution reaction (OER) catalysis is a significant opportunity for improving water electrolysers. Low-index facets surface Ru can achieve both high activity and stability for OER. Here, we present a new catalyst design where low-index faceted Ru branches are grown off the corners of Pt nanocubes, forming open Ru branched nanoparticles. This open branched structure, exposing low-index facets on its length-tunable branch, enables a high electrochemically active surface area (ECSA), achieving high activity and stability for OER. This design strategy and synthetic control provide a principle for achieving high-performance OER nanocatalysts.

Chemical Science

Formation of open ruthenium branched structures with highly exposed active sites for oxygen evolution reaction electrocatalysis†

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