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Research Article

Supporting IrOx nanosheets on hollow TiO2 for highly efficient acidic water splitting

Ge Yu§, Ruilong Li§, Yanmin Hu, Xingen Lin, Ze Lin, Dongyang Wu, Gongming Wang( ), Xun Hong( )
Center of Advanced Nanocatalysis (CAN), Department of Applied Chemistry, University of Science and Technology of China, Hefei 230026, China

§ Ge Yu and Ruilong Li contributed equally to this work.

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Graphical Abstract

Amorphous IrOx nanosheets were embedded on the hollow TiO2 spheres, which demonstrated excellent performance in acidic electrolytic water splitting with cell voltage as low as 1.485 V at 10 mA·cm−2 and stability for 200 h.

Abstract

The efficiency of proton exchange membrane water electrolysis (PEM-WE) for hydrogen production is heavily dependent on the noble metal iridium-based catalysts. However, the scarcity of iridium limits the large-scale application of PEM-WE. To address this issue, it is promising to select an appropriate support because it not only enhances the utilization efficiency of noble metals but also improves mass transport under high current. Herein, we supported amorphous IrOx nanosheets onto the hollow TiO2 sphere (denoted as IrOx), which demonstrated excellent performance in acidic electrolytic water splitting. Specifically, the annealed IrOx catalyst at 150 °C in air exhibited a mass activity of 1347.5 A·gIr−1, which is much higher than that of commercial IrO2 of 12.33 A·gIr−1 at the overpotential of 300 mV for oxygen evolution reaction (OER). Meanwhile, the annealed IrOx exhibited good stability for 600 h operating at 10 mA·cm−2. Moreover, when using IrOx and annealed IrOx catalysts for water splitting, a cell voltage as low as 1.485 V can be achieved at 10 mA·cm−2. The cell can continuously operate for 200 h with negligible degradation of performance.

Keywords

oxygen evolution reactionhydrogen evolution reactionamorphous IrOxhollow TiO2proton exchange membrane water electrolysis

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Nano Research
Volume 17 Issue 8,
August 2024
Pages 6903-6909
DOI: 10.1007/s12274-024-6681-7
Cite this article:
Yu G, Li R, Hu Y, et al. Supporting IrOx nanosheets on hollow TiO2 for highly efficient acidic water splitting. Nano Research, 2024, 17(8): 6903-6909. https://doi.org/10.1007/s12274-024-6681-7
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Received: 11 March 2024
Revised: 01 April 2024
Accepted: 02 April 2024
Published: 16 May 2024
© Tsinghua University Press 2024
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