The solar cell samples were provided by the team of A. Hessler-Wyser (EPFL, Switzerland). The hydrogen storage samples were provided by the team of G. Schmitz (Uni Stuttgart, Germany). The authors acknowledge funding from the Luxembourg National Research Fund (FNR) by the grants C18/MS/12661114 (MEMPHIS) and INTER/MERA/20/13992061 (INTERBATT).
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