Developing new technology to utilize solar power as alter-native energy is imperative to meet the challenge of fossil fuel consumption and consequently environmental con-tamination.Photocatalytic overall water splitting is regarded as an ideal reaction for realizing solar-to-chemical energy conversion.Up to date,many particle-suspension systems have been studied on a laboratory-scale with inorganic semiconductors including metal oxides,(oxy)nitrides,and oxysulfides under ultra-violet (UV) light irradiation [1].