Regensburg 2025 – scientific programme
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KFM: Fachverband Kristalline Festkörper und deren Mikrostruktur
KFM 13: Holistic Structural and Safety Assessment of Lithium-ion and Post-Lithium Cells and their Materials (Experimental Characterisation and Safety Testing)
KFM 13.7: Talk
Wednesday, March 19, 2025, 16:30–16:45, H9
A Solar Battolyzer Approach: On-Demand Hydrogen Production and Energy Storage in a 2D Niobium-Tungstate Material — Yang Wang1, •Yu-Te Chan2, Takayoshi OshimaViola1, Viola Duppel1, Sebastian Bette1, Kathrin Küster1, Andreas Gouder1, Christoph Scheurer2, 3, and Bettina Lotsch1, 4 — 1Max Planck Institute for Solid State Research, Stuttgart — 2Fritz-Haber-Institut der MPG, Berlin — 3IEK-9 Forschungszentrum, Jülich — 4Ludwig-Maximilians-Universität, Munich
In the quest to overcome the limitations of solar intermittency, materials that can simultaneously capture and store solar energy offer promising avenues for clean energy solutions. Here, we introduce the 2D niobium-tungstate TBA+NbWO6− as a novel solution capable of harnessing light energy and storing it either for direct grid integration or as fuel through on-demand hydrogen production. This dual-functionality is central to the emerging concept of "battolyzers," devices that combine battery and electrolyzer capabilities to provide both energy storage and fuel generation. Exposure to light triggers ion intercalation and stable polaron formation within the material, reducing resistance and allowing electron storage for extended durations. Introducing Pt as the catalyst allows the stored electrons to be released to generate hydrogen, demonstrating the material’s capability for efficient, on-demand solar energy conversion. Our findings on optoionic processes in NbWO6 lay the groundwork for future solar battolyzers, bridging solar energy storage and hydrogen fuel generation in a single system. [1] Y. Wang et al., J. Am. Chem. Soc. 146, 25467 (2024)
Keywords: solar battery; battolyzers