Effect of lattice strain on the electro-catalytic activity of IrO2 for water splitting

Wei Sun; Zhiqiang Wang; Waqas Qamar Zaman; Zhenhua Zhou; Limei Cao; Xue-Qing Gong; Ji Yang

doi:10.1039/c7cc09580e

Effect of lattice strain on the electro-catalytic activity of IrO₂ for water splitting

Chem Commun (Camb). 2018 Jan 23;54(8):996-999. doi: 10.1039/c7cc09580e.

Authors

Wei Sun¹, Zhiqiang Wang, Waqas Qamar Zaman, Zhenhua Zhou, Limei Cao, Xue-Qing Gong, Ji Yang

Affiliation

¹ State Environmental Protection Key Laboratory of Environmental Risk Assessment and Control on Chemical Processes, School of Resources and Environmental Engineering, East China University of Science and Technology, 130 Meilong Road, Shanghai 200237, P. R. China. yangji@ecust.edu.cn.

PMID: 29322156
DOI: 10.1039/c7cc09580e

Abstract

The lattice strain of IrO₂ plays a critical role in determining its OER activity. The Ir-O bond length change in IrO₆ coordination induces lattice strain. Increasing the annealing temperature results in a stretching strain along the c axis and a compressive strain on the a and b axes, leading to a larger c/a ratio. Enhancing the lattice strain decreases the c/a ratio, which is beneficial for improving OER activity.