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General π-electron-assisted strategy for single-atom (Ir, Pt, Ru, Pd, Fe, and Ni) electrocatalysts with bi-functional active sites toward highly efficient water splitting

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posted on 2024-11-16, 02:27 authored by Weihong LaiWeihong Lai, Li-Fu Zhang, Wei-Bo Hua, Sylvio Indris, Zichao Yan, Zhe Hu, Binwei Zhang, Yani Liu, Li Wang, Min Liu, Rong Liu, Yunxiao WangYunxiao Wang, Jiazhao WangJiazhao Wang, Zhenpeng Hu, Hua LiuHua Liu, Shulei Chou, Shi DouShi Dou
Both the hydrogen evolution reaction (HER) and the oxygen evolution reaction (OER) are crucial to water splitting, but require alternative active sites. Now, a general pelectron- assisted strategy to anchor single-atom sites (M=Ir, Pt, Ru, Pd, Fe, Ni) on a heterogeneous support is reported. The Matoms can simultaneously anchor on two distinct domains of the hybrid support, four-fold N/C atoms (M@NC), and centers of Co octahedra (M@Co), which are expected to serve as bifunctional electrocatalysts towards the HER and the OER. The Ir catalyst exhibits the best water-splitting performance, showing a low applied potential of 1.603V to achieve 10 mAcm@2 in 1.0m KOH solution with cycling over 5 h. DFT calculations indicate that the Ir@Co (Ir) sites can accelerate the OER, while the Ir@NC3 sites are responsible for the enhanced HER, clarifying the unprecedented performance of this bifunctional catalyst towards full water splitting.

Funding

Development of novel composite anode materials combined with new binders for high energy, high power and long life lithium-ion batteries

Australian Research Council

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Room-temperature sodium-sulphur batteries

Australian Research Council

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A 200 keV Analytical Transmission Electron Microscope

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History

Citation

Lai, W., Zhang, L., Hua, W., Indris, S., Yan, Z., Hu, Z., Zhang, B., Liu, Y., Wang, L., Liu, M., Liu, R., Wang, Y., Wang, J., Hu, Z., Liu, H., Chou, S. & Dou, S. (2019). General p-Electron-Assisted Strategy for Ir, Pt, Ru, Pd, Fe, Ni Single- Atom Electrocatalysts with Bifunctional Active Sites for Highly Efficient Water Splitting. Angewandte Chemie-international Edition, 58 (34), 11868-11873.

Journal title

Angewandte Chemie - International Edition

Volume

58

Issue

34

Pagination

11868-11873

Language

English

RIS ID

137938

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