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Photoelectrochemical devices based on III–V semiconductors have high performance potential but their cost and stability inhibit their wide application. Kang et al. make printed assemblies of GaAs-based photoelectrodes with separate optical and reactive interfaces, demonstrating water-splitting efficiency up to 13.1%.
Solar water-splitting efficiency can be enhanced by careful bandgap selection in multi-junction semiconductor structures. Young et al. demonstrate a route that allows independent bandgap tuning of each junction in an immersed water-splitting device, enabling a solar-to-hydrogen efficiency of over 16%.
Solar hydrogen production through photocatalytic water splitting requires active and stable co-catalysts to replace platinum. Here, the authors use DFT to identify Ti3C2 nanoparticles as potential co-catalysts, and assess their photocatalytic hydrogen production activity.
Theoretical limiting efficiencies play a critical role in determining technological viability and expectations for device prototypes. Here, the authors present a unified framework for photoelectrochemical device performance through which previous limiting efficiencies can be understood and contextualized.