While dye-sensitized metal oxides are good candidates as H 2 evolution photocatalysts for solar-driven Z-scheme water splitting, their solar-to-hydrogen (STH) energy conversion efficiencies remain low because of uncontrolled charge recombination reactions. Here, we show that modification of Ru dye–sensitized, Pt-intercalated HCa 2 Nb 3 O 10 nanosheets ( Ru /Pt/HCa 2 Nb 3 O 10 ) with both amorphous Al 2 O 3 and poly(styrenesulfonate) (PSS) improves the STH efficiency of Z-scheme overall water splitting by a factor of ~100, when the nanosheets are used in combination with a WO 3 -based O 2 evolution photocatalyst and an I 3 − /I − redox mediator, relative to an analogous system that uses unmodified Ru /Pt/HCa 2 Nb 3 O 10 . By using the optimized photocatalyst, PSS/ Ru /Al 2 O 3 /Pt/HCa 2 Nb 3 O 10 , a maximum STH of 0.12% and an apparent quantum yield of 4.1% at 420 nm were obtained, by far the highest among dye-sensitized water splitting systems and comparable to conventional semiconductor-based suspended particulate photocatalyst systems.

中文翻译：

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表面改性的染料敏化铌酸盐纳米片可实现高效的太阳能驱动 Z 方案，用于整体水分解

虽然染料敏化金属氧化物是很好的候选者，如 H2用于太阳能驱动的 Z 型水分解的进化光催化剂，由于不受控制的电荷重组反应，它们的太阳能-氢 (STH) 能量转换效率仍然很低。在这里，我们展示了 Ru 染料敏化的 Pt 插层 HCa 的改性2铌3○10纳米片 ( Ru /Pt/HCa2铌3○10) 与非晶铝2○3当纳米片与 WO 结合使用时，聚（苯乙烯磺酸盐）（PSS）将 Z 方案整体水分解的 STH 效率提高了约 100 倍3基于 O2进化光催化剂和I3 -/我-氧化还原介体，相对于使用未修饰的 Ru/Pt/HCa 的类似系统2铌3○10. 通过使用优化的光催化剂 PSS/ Ru /Al2○3/铂/HCa2铌3○10，在 420 nm 处获得了 0.12% 的最大 STH 和 4.1% 的表观量子产率，这是迄今为止染料敏化水分解系统中最高的，并且可与传统的基于半导体的悬浮颗粒光催化剂系统相媲美。