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Amorphous MoO2 with a porous nanostructure as a highly efficient electrocatalyst for overall water splitting

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Abstract

Designing an economical, superior activity, excellent stability, and earth-rich catalysts is of crucial significance in the progress of electrochemical water splitting and still remains huge challenge to overcome. In this work, amorphous MoO2 with a porous nanostructure as a novel bifunctional electrocatalyst has been prepared by the hydrothermal method. This nanostructure has excellent HER/OER properties, in which the amorphous and porous states have a large number of vacancies and active sites exposed to the electrolyte. The as-prepared sample has been researched in detail via X-ray diffraction (XRD) and transmission electron microscopy (TEM). Electrochemical experiments show that when the current density reaches − 10 mA cm−2, the as-prepared samples need an overpotential of only about − 0.930 V (vs. RHE) in 1 M H2SO4 and − 0.777 V (vs. RHE) in 1 M KOH for HER, respectively. Furthermore, MoO2 exhibits an extremely overpotential of 2.414 V (vs. RHE) at 10 mA cm−2 in 1 M KOH for OER. It is believed that the amorphous and porous nanostructure remains a promising and efficient hydrolytic electrocatalyst.

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All data generated or analysed during this study are included in this published article (and its supplementary information files).

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Acknowledgements

This work was supported by the Grants from National Natural Science Foundation of China (No. 11504312), Excellent Youth Foundation of Hubei Province (Grant No. 2019CFA083), Provincial Natural Science Foundation of Hunan (No. 2016JJ2132, 2021JJ30298), the Science and Technology Program of Hunan Province, China (Grant No. 2019TP1014), as well as the Program for Changjiang Scholars and Innovative Research Team in University (IRT_17R91).

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JT contributed to the experiment, processed the data and wrote the paper. The data analysis was performed and the grammar was modified by SL, YL and HQ, GL, ZZ and LL conducted the experiment and discussed the results. CL and XQ proposed the study conception and design. ZW is responsible for part of the experimental data, data discussion and grammar revision.

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Correspondence to Chang Li or Xiang Qi.

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Tao, J., Liu, S., Liao, Y. et al. Amorphous MoO2 with a porous nanostructure as a highly efficient electrocatalyst for overall water splitting. Appl. Phys. A 128, 618 (2022). https://doi.org/10.1007/s00339-022-05734-3

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