Photosensitizing ruthenium(II)–dye multilayers: photoinduced charge separation and back electron transfer suppression,Sustainable Energy & Fuels

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Photosensitizing ruthenium(II)–dye multilayers: photoinduced charge separation and back electron transfer suppression
Sustainable Energy & Fuels ( IF 5.0 ) Pub Date : 2020-04-23 , DOI: 10.1039/d0se00151a
Nobutaka Yoshimura _{1,

2,

3,

4,

5} , Atsushi Kobayashi _{1,

2,

3,

4,

5} , Wataru Genno _{5,

6,

7,

8} , Takashi Okubo _{5,

6,

7,

8} , Masaki Yoshida _{1,

2,

3,

4,

5} , Masako Kato _{1,

2,

3,

4,

5}

Affiliation

Photocatalytic H₂ evolution activity of three types of Ru(II)-photosensitizer(PS)-multilayered Pt-cocatalyst loaded TiO₂ nanoparticles, RuCP²@Pt–TiO₂, RuCP²–Zr–RuP⁶@Pt–TiO₂, and RuCP²–Zr–RuP⁴–Zr–RuP⁶@Pt–TiO₂ were investigated in the presence of the redox-reversible iodide electron donor aqueous solution. The apparent quantum yield (AQY) significantly improved by about 40 times by increasing the number of Ru(II)–PS layers and decreasing the loading amount of Pt cocatalyst on the surface of TiO₂ nanoparticles. The zeta potential measurement suggests that the Zr⁴⁺ cations between the PS-layers acted as the iodide capturing sites to promote the electron donation. Photocurrent–voltage characteristics of the Ru(II)–PS-multilayered photoelectrodes RuCP²@TiO₂–ITO, RuCP²–Zr–RuP⁶@TiO₂–ITO, and RuCP²–Zr–RuP⁴–Zr–RuP⁶@TiO₂–ITO in aqueous I⁻/I₃⁻ electrolyte solution revealed that the thicker Ru(II)–PS-layer with the Zr⁴⁺ cations contributes not only to suppressing the back electron transfer from Pt–TiO₂ surface to the oxidized iodine species but also to enhancing the photoinduced electron injection.

中文翻译：

光敏钌（II）-染料多层：光致电荷分离和反向电子转移抑制

光催化ħ ₂三种类型的Ru的进化活性（II）-photosensitizer（PS）-multilayered Pt的助催化剂负载的TiO _2个纳米颗粒，RuCP ² @铂的TiO ₂，RuCP ² -Zr- RUP ⁶ @铂的TiO ₂，和在氧化还原可逆碘化物电子供体水溶液的存在下研究了RuCP ² -Zr- RuP ⁴ -Zr - RuP ⁶ @ Pt-TiO ₂。通过增加Ru（II）-PS层并减少TiO ₂纳米颗粒表面上Pt助催化剂的负载量。ζ电势测量表明，PS层之间的Zr ⁴⁺阳离子充当碘化物捕获位点，以促进电子捐赠。Ru（II）-PS多层光电极RuCP ² @TiO ₂ –ITO，RuCP ² –Zr– RuP ⁶ @TiO ₂ –ITO和RuCP ² –Zr– RuP ⁴ –Zr– RuP ⁶ @的光电流-电压特性的TiO ₂ -ITO在含水我^- / I₃^-电解质溶液，发现该厚的Ru（ II）-PS-层与Zr的⁴⁺阳离子不仅有助于抑制选自Pt-TIO背面电子转移₂表面到氧化碘物质还能提高光诱导电子注入。

更新日期：2020-06-30

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