Janus electronic state of supported iridium nanoclusters for sustainable alkaline water electrolysis

Yaoda Liu, Lei Li, Li Wang, Na Li, Xiaoxu Zhao, Ya Chen, Thangavel Sakthivel and Zhengfei Dai ()
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Yaoda Liu: Xi’an Jiaotong University
Lei Li: Xi’an Jiaotong University
Li Wang: Central South University
Na Li: Central South University
Xiaoxu Zhao: Peking University
Ya Chen: Xi’an Jiaotong University
Thangavel Sakthivel: Kumoh National Institute of Technology
Zhengfei Dai: Xi’an Jiaotong University

Nature Communications, 2024, vol. 15, issue 1, 1-11

Abstract: Abstract Metal-support electronic interactions play crucial roles in triggering the hydrogen spillover (HSo) to boost hydrogen evolution reaction (HER). It requires the supported metal of electron-rich state to facilitate the proton adsorption/spillover. However, this electron-rich metal state contradicts the traditional metal→support electron transfer protocol and is not compatible with the electron-donating oxygen evolution reaction (OER), especially in proton-poor alkaline conditions. Here we profile an Ir/NiPS3 support structure to study the Ir electronic states and performances in HSo/OER-integrated alkaline water electrolysis. The supported Ir is evidenced with Janus electron-rich and electron-poor states at the tip and interface regions to respectively facilitate the HSo and OER processes. Resultantly, the water electrolysis (WE) is efficiently implemented with 1.51 V at 10 mA cm–2 for 1000 h in 1 M KOH and 1.44 V in urea-KOH electrolyte. This research clarifies the Janus electronic state as fundamental in rationalizing efficient metal-support WE catalysts.

Date: 2024
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DOI: 10.1038/s41467-024-47045-6

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