Abstract
Hydrogen production through water electrolysis is of considerable interest for converting the intermittent electricity generated by renewable energy sources into storable chemical energy, but the typical water electrolysis process requires a high working voltage (>1.23 V) and produces oxygen at the anode in addition to hydrogen at the cathode. Here we report a hydrogen production system that combines anodic and cathodic H2 production from low-potential aldehyde oxidation and the hydrogen evolution reaction, respectively, at a low voltage of ~0.1 V. Unlike conventional aldehyde electrooxidation, in which the hydrogen atom of the aldehyde group is oxidized into H2O at high potentials, the low-potential aldehyde oxidation enables the hydrogen atom to recombine into H2 gas. The assembled electrolyser requires an electricity input of only ~0.35 kWh per m3 of H2, in contrast to the ~5 kWh per m3 of H2 required for conventional water electrolysis. This study provides a promising avenue for the safe, efficient and scalable production of high-purity hydrogen.

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Data availability
The data that support the findings of this study are included in the published article and its Supplementary Information. All other data are available from the authors upon reasonable request. Source data are provided with this paper.
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Acknowledgements
This work is supported by the National Key R&D Program of China (grant nos. 2021YFA1500900 (S.W.)), the National Natural Science Foundation of China (grants nos. 21902047 (Y.Z.), 21825201 (S.W.) and U19A2017 (S.W.)) and the Provincial Natural Science Foundation of Hunan (grants nos. 2016TP1009 (S.W.) and 2020JJ5045 (S.W.)).
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Contributions
S.W. and X.-Z.F. conceived the project. T.W. and L.T. carried out most of the experiments and co-wrote the manuscript. X.Z. and Y.L. performed the theoretical calculations. C.C., W.C., S.D. and Y.Z. performed partial characterization of the materials. B.Z., D.W., P.L., C.X., W.L., Y.W., R.C. and Y.Z. participated in data analysis. X.D. provided some important and constructive suggestions to this work. All authors discussed the results and commented on the manuscript.
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Supplementary Information
Supplementary Figs. 1–30, Discussion, Table 1 and Videos 1 and 2.
Supplementary Video 1
Control experiment of low-potential furfural oxidation using Ag/carbon cloth as the electrode.
Supplementary Video 2
Typical experiment for determining volumes of H2 produced from the anode and cathode of the bipolar hydrogen production system.
Supplementary Data 1
Computational data.
Supplementary Data 2
Statistical source data for Supplementary figures.
Source data
Source Data Fig. 2
Statistical source data.
Source Data Fig. 3
Statistical source data.
Source Data Fig. 4
Statistical source data.
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Wang, T., Tao, L., Zhu, X. et al. Combined anodic and cathodic hydrogen production from aldehyde oxidation and hydrogen evolution reaction. Nat Catal 5, 66–73 (2022). https://doi.org/10.1038/s41929-021-00721-y
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DOI: https://doi.org/10.1038/s41929-021-00721-y
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