The study investigated the synergistic effects of rGO and Pt over TiO₂ for the HER via artificial photosynthesis under UVB and visible light irradiation. The introduction of glycerol and industrial wastewater to the system as sacrificial reductants signifies that the major reaction pathway is photocatalytic partial water splitting. The material characterizations revealed successful heterojunction formation and provided insight into chemistry behind the activity of the photocatalysts. Amongst various combinations of rGO on TiO₂, 1GNT exhibited an HER yield five times that of bare TiO₂ under UVB light. Addition of Pt led to the formation of a strong Schottky barrier at the heterojunction and consequently boosted HER performance. 1P0.5 GT presented the highest of 28.5 mmol g⁻¹ h⁻¹ with glycerol and 9.6 mmol g⁻¹ h⁻¹ with wastewater under UVB light respectively. For both binary and ternary photocatalysts, the HER performances dwindled under visible light irradiation, accentuating the insufficient activation of the TiO₂. In addition, 1PT outperformed all the other photocatalysts thereby elucidating the impression that rGO and Pt does not work well together in enhancing HER despite quenching the exciton recombination rate of TiO₂ significantly. The role of pH in the synthesis and the experiments has been discussed. Finally, the underlying mechanisms in the photodeposition and photoreformation have been proposed.

该研究通过UVB和可见光照射下的人工光合作用研究了rGO和Pt在TiO ₂上对HER的协同作用。将甘油和工业废水作为牺牲性还原剂引入系统，表明主要的反应途径是光催化部分水分解。材料表征揭示了成功的异质结形成，并提供了对光催化剂活性背后的化学的认识。在rGO在TiO ₂上的各种组合中，1GNT的HER产率是裸TiO _2的五倍。在UVB光下。Pt的添加导致在异质结处形成强大的肖特基势垒，从而提高了HER性能。在UVB光下，甘油的1P0.5 GT和废水的最高分别为28.5 mmol g ^-1  h ^-1和9.6 mmol g ^-1  h ^-1。对于二元和三元光催化剂，在可见光照射下HER性能降低，从而加剧了TiO _2的活化不足。此外，1PT的性能优于所有其他光催化剂，从而阐明了rGO和Pt尽管增强了TiO ₂的激子复合速率，但在增强HER方面不能很好地协同工作的印象。显着。讨论了pH在合成和实验中的作用。最后，提出了光沉积和光重组的潜在机理。