Nitrogen and sulfur dual-doped chitin-derived carbon/graphene composites as effective metal-free electrocatalysts for dye sensitized solar cells
Nitrogen and sulfur dual-doped chitin-derived carbon/graphene composites as effective metal-free electrocatalysts for dye sensitized solar cells
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氮和硫双掺杂甲壳素衍生的碳/石墨烯复合材料作为染料敏化太阳能电池的有效无金属电催化剂
DOI：
10.1016/j.apsusc.2018.02.071
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发表时间：
2018-05-31
影响因子：
6.7
通讯作者：
Feng, Jiwen
中科院分区：
文献类型：
--
作者：
Di, Yi;Xiao, Zhanhai;Feng, Jiwen
染料敏化太阳能电池（DSSC）的光伏性能很大程度上受到其对电极（CE）材料的电催化能力的影响。为了获得经济且高性能的电催化剂，通过在退火过程中原位掺硫的方法制备了N/S双掺杂甲壳素衍生碳材料SCCh，与原始甲壳素衍生碳基体CCh相比，产生了更丰富的活性位点，从而增强了碳材料的固有催化活性。当 SCCh 与石墨烯结合时，由于促进电子快速转移，所产生的复合材料具有进一步增强的催化活性。与优化的rGO-SCCh-3复合CE组装的DSSC表现出良好的功率转换效率，为6.36%，与Pt溅射电极（6.30%）相当，表明复合材料具有出色的I-3-还原能力。电化学表征表明，低电荷转移电阻和优异的电催化活性都有助于实现优异的光伏性能。更重要的是，复合CE在实际操作中表现出良好的电化学稳定性。考虑到成本低廉和制备过程简单，目前的无金属碳质复合材料可以作为未来大规模生产 DSSC 的有前景的对电极材料。 (C) 2018 Elsevier B.V. 保留所有权利。
The photovoltaic performance of dye-sensitized solar cell (DSSC) is strongly influenced by the electrocatalytic ability of its counter electrode (CE) materials. To obtain the affordable and high-performance electrocatalysts, the N/S dual-doped chitin-derived carbon materials SCCh were manufactured via in-situ S-doped method in the annealing process, where richer active sites are created compared to the pristine chitin-derived carbon matrix CCh, thus enhancing the intrinsic catalytic activity of carbon materials. When SCCh is incorporated with graphene, the yielded composites hold a further boosted catalytic activity due to facilitating the electronic fast transfer. The DSSC assembled with the optimizing rGO-SCCh-3 composite CE shows a favourable power conversion efficiency of 6.36%, which is comparable with that of the Pt-sputtering electrode (6.30%), indicate of the outstanding I-3- reduction ability of the composite material. The electrochemical characterizations demonstrate that the low charge transfer resistance and excellent electrocatalytic activity all contribute to the superior photovoltaic performance. More importantly, the composite CE exhibits good electrochemical stability in the practical operation. In consideration of the low cost and the simple preparation procedure, the present metal-free carbonaceous composites could be used as a promising counter electrode material in future large scale production of DSSCs. (C) 2018 Elsevier B.V. All rights reserved.