贵金属铂（Pt）的高成本、低储量使得寻求非Pt的染料敏化太阳能电池(DSSC)对电极材料引起科研工作者的广泛关注。然而，由于对Co基氧化还原电对在对电极表面的非均相催化过程的理解尚不成熟，目前高效筛选非Pt对电极材料仍是一大挑战。本项目将以申请人以往在对电极材料催化机理及表面微结构调控等方面的研究成果为基础，致力于解决基于Co基电解质的DSSC的关键科学问题，并实现以下几个目标：可控合成具有特定晶面和表面原子构型的氧化物、硫化物等新型对电极材料；阐明对电极材料的表面几何结构、电子结构与其电催化性能及DSSC光电性能之间的构效关系；揭示对电极材料表面催化的关键步骤及其机理，建立非Pt对电极材料的理论筛选策略；基于上述成果，开发出一批高性能、低成本的非Pt对电极材料，推进染料敏化太阳能电池这一光伏器件的产业化进程。

Developing non-Pt based counter electrode materials for dye-sensitized solar cells(DSSC) has attracted great research interest due to the low abundance and high cost of Pt. However, on current stage, it is till an open challenge to screen potential counter electrode materials efficiently because of the limited understanding of the heterogeneous catalytic behaviours of Co-based redox mediators on the surface of counter electrodes. Based on our preliminary results of mechanistic study on the catalytic reactions of redox couples and micro-structure optimization for counter electrodes, this project will concentrated on the critical scientific issues in DSSC containing cobalt(II/III) electrolyte.In this project,we will synthesize novel counter electrode materials such as metal oxides or metal sulfides with unique crystal facets and surface atomic configurations. Furthermore, the project will explore the relationship between the surface geometrical and electrical structures and catalytic bahaviours, which largely determine the device performance. More importantly, this project will reveal the key steps of surface catalysis of redox mediators and develop a general principle for screening Pt-free alternative counter electrode materials, which can promote the commercialization of this emerging photovoltaic technique.