Direct Ice Splitting into H<sub>2</sub> and O<sub>2</sub> Enabled by High Ionic Conductivity

The molecular splitting of H<sub>2</sub>O is fundamentally significant in energy conversion and storage. While liquid water splitting has achieved scientific and engineering success, the decomposition of solid-state ice has yet to be realized. Here we demonstrate that ice can be directly split at temperatures as low as -40 °C. We show that ice can serve as a high-performance solid electrolyte for proton and hydroxide conduction, with proton mobility estimated to be 1-2 orders of magnitude higher than in liquid water. As a result, ice splitting is achieved at a voltage of 2.18 V at 10 mA cm<sup>-2</sup>, with an energy efficiency of approximately 70% at -10 °C. By using ice as a solid electrolyte, ice splitting circumvents the issue of hydrogen crossover, which is inherent in water splitting. These findings introduce new pathways for energy conversion and storage through ice at sub-0 °C temperatures and further provide new insights for the understanding of the electrochemical process in ice.

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Publication Details

Journal
Journal of the American Chemical Society
Published
2025-05-23
DOI
https://doi.org/10.1021/jacs.5c01779
Citations
1
Primary Topic
Gas Sensing Nanomaterials and Sensors
Type
article
Field-Weighted Citation Impact
0.73

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Direct Ice Splitting into H2 and O2 Enabled by High Ionic Conductivity

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Direct Ice Splitting into H2 and O2 Enabled by High Ionic Conductivity

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article en
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Abstract

The molecular splitting of H<sub>2</sub>O is fundamentally significant in energy conversion and storage. While liquid water splitting has achieved scientific and engineering success, the decomposition of solid-state ice has yet to be realized. Here we demonstrate that ice can be directly split at temperatures as low as -40 °C. We show that ice can serve as a high-performance solid electrolyte for proton and hydroxide conduction, with proton mobility estimated to be 1-2 orders of magnitude higher than in liquid water. As a result, ice splitting is achieved at a voltage of 2.18 V at 10 mA cm<sup>-2</sup>, with an energy efficiency of approximately 70% at -10 °C. By using ice as a solid electrolyte, ice splitting circumvents the issue of hydrogen crossover, which is inherent in water splitting. These findings introduce new pathways for energy conversion and storage through ice at sub-0 °C temperatures and further provide new insights for the understanding of the electrochemical process in ice.

Journal of the American Chemical SocietyVol. 147(27)
Beijing University of Posts and Telecommunications (CN), Jinan University (CN), Chinese Academy of Sciences (CN), Peking University (CN), Beijing National Laboratory for Molecular Sciences (CN), FZU ‒ Institute of Physics of the Academy of Sciences of the Czech Republic (CZ), Division of Materials Science and Engineering (AU), Institute of Physics (CN), Tsinghua University (CN)
National Natural Science Foundation of China
Openalex Percentile: Top 28%
Gas Sensing Nanomaterials and Sensors
0.73
DOISourceOpenAlex
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