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Oxygen-Fate Accounting in GaN-Derived Solar Water Conversion
Zhaosong Wu1,2, Ding Wang1,2, Liang Qiu1,2
1Key Laboratory for Power Machinery and Engineering of Ministry of Education, Research Center for Renewable Synthetic Fuel, School of Mechanical Engineering, Shanghai Jiao Tong University, Shanghai, China.
Abstract:
Solar water splitting should be evaluated by its oxygen-side products as well as hydrogen evolution. GaN/InGaN systems provide established examples of overall water splitting, while H2/H2O2 coproduction, accompanied by O2 formation, has been reported for Pd-modified GaN nanowires in alkaline seawater. We examine how light absorption, charge transport, and local heating in GaN-derived structures affect oxygen-product formation and peroxide stability. Full-spectrum utilization is assessed through the distinct contributions of carriers and heat. This Perspective connects hydrogen production with oxygen-product identification, oxygen-source tracing, and peroxide stability. Product balances and measurements of carrier and thermal effects provide a basis for evaluating GaN-derived material design.
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