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首页> 外文期刊>Chemistry: A European journal >Well-Dispersed CoS Nanoparticles on a Functionalized Graphene Nanosheet Surface: A Counter Electrode of Dye-Sensitized Solar Cells
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Well-Dispersed CoS Nanoparticles on a Functionalized Graphene Nanosheet Surface: A Counter Electrode of Dye-Sensitized Solar Cells

机译：功能化石墨烯纳米片表面上分散良好的CoS纳米颗粒：染料敏化太阳能电池的反电极

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摘要

With a facile electrophoretic deposition and chemical bath process, CoS nanoparticles have been uniformly dispersed on the surface of the functionalized graphene nanosheets (FGNS). The composite was employed as a counter electrode of dye-sensitized solar cells (DSSCs), which yielded a power conversion efficiency of 5.54 %. It is found that this efficiency is higher than those of DSSCs based on the non-uniform CoS nanoparticles on FGNS (4.45%) and built on the naked CoS nanoparticles (4.79 %). The achieved efficiency of our cost-effective DSSC is also comparable to that of noble metal Pt-based DSSC (5.90 %). Our studies have revealed that both the exceptional electrical conductivity of the FGNS and the excellent catalytic activity of the CoS nanoparticles improve the conversion efficiency of the uniformly FGNS-CoS composite counter electrode. The electrochemical impedance spectra, cyclic voltammetry, and Tafel polarization have evidenced the best catalytic activity and the fastest electron transport. Additionally, the dispersion condition of CoS nanoparticles on FGNS plays an important role for catalytic reduction of I_3~-.
机译：通过简便的电泳沉积和化学浴工艺，CoS纳米颗粒已经均匀地分散在功能化石墨烯纳米片（FGNS）的表面上。该复合材料用作染料敏化太阳能电池（DSSC）的对电极，其功率转换效率为5.54％。发现该效率高于基于FGNS上不均匀CoS纳米颗粒的DSSC的效率（4.45％）和基于裸CoS纳米颗粒的DSSC的效率（4.79％）。我们具有成本效益的DSSC所达到的效率也可与贵金属Pt基DSSC相比（5.90％）。我们的研究表明，FGNS的出色电导率和CoS纳米颗粒的出色催化活性均提高了均匀FGNS-CoS复合对电极的转化效率。电化学阻抗谱，循环伏安法和Tafel极化证明了最佳的催化活性和最快的电子传输。此外，CoS纳米颗粒在FGNS上的分散条件对于I_3〜-的催化还原起着重要作用。

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