Keggin-type polyoxometalate/thiospinel octahedron heterostructures for photoelectronic devices,Inorganic Chemistry Frontiers

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Keggin-type polyoxometalate/thiospinel octahedron heterostructures for photoelectronic devices
Inorganic Chemistry Frontiers ( IF 6.1 ) Pub Date : 2020-05-22 , DOI: 10.1039/d0qi00371a
Peng He _{1,

2,

3,

4,

5} , Xiaohong Li _{1,

2,

3,

4,

5} , Ting Wang _{1,

2,

3,

4,

5} , Weichao Chen _{1,

2,

3,

4,

5} , Hong Zhang _{1,

2,

3,

4,

5} , Weilin Chen _{1,

2,

3,

4,

5}

Affiliation

All-inorganic heterostructures have attracted intense interest for new energy and environmental applications recently, especially in photoelectronic devices. Herein, we firstly obtain a novel CoIn₂S₄ thiospinel octahedron through a simple one-step hydrothermal synthesis method. On this basis we further propose a strategy to prepare all-inorganic heterostructures (NH₄)₄Co^II[Co^IIW₁₂O₄₀]·20H₂O/CoIn₂S₄ (CoW₁₂-n/CoIn₂S₄, where n represents the molar number of CoW₁₂) through doping Keggin-type polyoxometalates (POMs). The addition of POMs can alleviate the cross-growth of the CoIn₂S₄ octahedron and increase the specific surface area and the number of exposed active sites of the heterostructures. What's more, we investigate the electrocatalytic triiodide reduction properties of the heterostructures. Electrochemical measurements show that POM contents have an obvious influence on the catalytic activity of this heterostructure catalyst. The CoW₁₂-0.3/CoIn₂S₄ heterostructures present the best catalytic performance and the lowest charge transfer resistance. Consequently, the dye-sensitized solar cells (DSSCs) with CoW₁₂-0.3/CoIn₂S₄ heterostructures as a counter electrode (CE) show the highest photovoltaic conversion efficiency (PCE) of up to 6.79%, superior to that of the Pt CE (5.83%). This work not only provides an approach for designing composites for efficient electrocatalytic triiodide reduction, but also represents a further step towards the application of all-inorganic heterostructures in photoelectronic devices.

中文翻译：

光电器件的Keggin型多金属氧酸盐/硫代松油八面体异质结构

全无机异质结构最近对新能源和环境应用引起了极大的兴趣，特别是在光电器件中。在这里，我们首先通过简单的一步水热合成方法获得了一种新型的CoIn ₂ S ₄硫代松油八面体。在此基础上，我们进一步提出了制备全无机异质结构（NH ₄）₄ Co ^II [Co ^II W ₁₂ O ₄₀ ]·20H ₂ O / CoIn ₂ S ₄（CoW ₁₂ - n / CoIn ₂ S ₄，ñ表示通过掺杂Keggin型多金属氧酸盐（POM）的CoW ₁₂的摩尔数。POM的添加可以减轻CoIn ₂ S ₄八面体的交叉生长，并增加比表面积和异质结构暴露的活性位点的数量。此外，我们研究了异质结构的电催化三碘化物还原性能。电化学测量表明，POM含量对该异质结构催化剂的催化活性有明显影响。CoW ₁₂ -0.3 / CoIn ₂ S ₄异质结构表现出最佳的催化性能和最低的电荷转移阻力。因此，具有CoW ₁₂ -0.3 / CoIn ₂ S ₄异质结构作为对电极（CE）的染料敏化太阳能电池（DSSC ）显示最高的光电转换效率（PCE）高达6.79％，优于Pt CE（5.83％）。这项工作不仅提供了一种设计复合物以有效还原三碘化物的方法，而且代表了将全无机异质结构应用于光电器件的又一步。

更新日期：2020-07-14

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