GaN:ZnO光アノードの界面最適化による電荷分離・注入促進と太陽光水酸化効率の向上
Photoelectrochemical water splitting is a promising route for converting solar energy into molecular hydrogen as a storable fuel. This study focused on improving the performance of GaN:ZnO photoanodes by addressing two key limiting factors: charge separation within the bulk material and charge injection at the electrode–electrolyte interface. Moisture-assisted nitridation combined with HCl acid treatment was applied to reduce recombination centers at internal interfaces within the GaN:ZnO solid solution particles. Additionally, a multimetal phosphide cocatalyst (NiCoFeP) was introduced at the photoanode surface to facilitate water oxidation and lower the overpotential for charge injection. The combined optimizations yielded a photocurrent density of 3.9 mA/cm² at 1.23 V versus the reversible hydrogen electrode and a solar-to-hydrogen conversion efficiency exceeding 1%, representing a notable benchmark for this class of photoanode materials.
Moisture-assisted nitridation and HCl acid treatment suppress recombination centers at internal GaN:ZnO interfaces, while the NiCoFeP multimetal phosphide cocatalyst reduces the overpotential at the photoanode–electrolyte interface, collectively enhancing charge separation and injection for water oxidation.
The delivery route is not clearly identifiable from this paper. For hydrogen intake, inhalation is the most efficient route; inhalation, however, carries explosion risk (empirical LFL of 10%; high-concentration devices are not recommended).
See also:
https://h2-papers.org/en/papers/28832111