Remarkably Enhanced Lattice Oxygen Participation in Perovskites to Boost Oxygen Evolution Reaction

Author:

Singh Aditya Narayan1ORCID,Hajibabaei Amir2ORCID,Diorizky Muhammad Hanif3,Ba Qiankai3,Nam Kyung-Wan14ORCID

Affiliation:

1. Department of Energy and Materials Engineering, Dongguk University, Seoul 04620, Republic of Korea

2. Yusuf Hamied Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge CB2 1EW, UK

3. Center for Superfunctional Materials, Department of Chemistry, Ulsan National Institute of Science and Technology (UNIST), 50, UNIST-gil, Ulsan 44919, Republic of Korea

4. Center for Next Generation Energy and Electronic Materials, Dongguk University, Seoul 04620, Republic of Korea

Abstract

Enhancing the participation of the lattice oxygen mechanism (LOM) in several perovskites to significantly boost the oxygen evolution reaction (OER) is daunting. With the rapid decline in fossil fuels, energy research is turning toward water splitting to produce usable hydrogen by significantly reducing overpotential for other half-cells’ OER. Recent studies have shown that in addition to the conventional adsorbate evolution mechanism (AEM), participation of LOM can overcome their prevalent scaling relationship limitations. Here, we report the acid treatment strategy and bypass the cation/anion doping strategy to significantly enhance LOM participation. Our perovskite demonstrated a current density of 10 mA cm−2 at an overpotential of 380 mV and a low Tafel slope (65 mV dec−1) much lower than IrO2 (73 mV dec−1). We propose that the presence of nitric acid-induced defects regulates the electronic structure and thereby lowers oxygen binding energy, allowing enhanced LOM participation to boost OER significantly.

Funder

National Research Foundation of Korea

Publisher

MDPI AG

Subject

General Materials Science,General Chemical Engineering

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