Efficient electron transfer kuramite Cu 3 SnS 4 nanosheet thin film towards platinum-free cathode in dye-sensitized solar cells
Efficient electron transfer kuramite Cu 3 SnS 4 nanosheet thin film towards platinum-free cathode in dye-sensitized solar cells
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DOI：
10.1016/j.jpowsour.2016.11.107
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发表时间：
2017-02
影响因子：
9.2
通讯作者：
Shanlong Chen;J. Tao;H. Shu;H. Tao;Yuxin Tang;Yizhou Shen;Tao Wang;L. Pan
中科院分区：
文献类型：
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作者：
Shanlong Chen;J. Tao;H. Shu;H. Tao;Yuxin Tang;Yizhou Shen;Tao Wang;L. Pan
密度泛函理论计算结果表明，Cu 3SnS 4材料具有金属特性，在染料敏化太阳能电池体系中，I3−离子与Cu 3SnS 4表面之间的电荷转移更快，I3−/I−的氧化还原转移反应更快.提出了一种可行的温和溶液法在FTO衬底上原位合成富Cu的Kuramite结构Cu 3SnS 4薄膜，并将所得薄膜直接作为对电极组装成染料敏化太阳能电池，无需任何后处理。所得-Cu 3SnS 4纳米片膜具有良好的结合强度、扩大的表面积、对电极/电解质界面处的低光电子电荷转移电阻以及对I3−/I−离子还原的高催化活性。采用Cu 3SnS 4纳米片作为对电极，获得了7.80%的能量转换效率，比Pt电极的能量转换效率（6.52%）有上级的提高。我们的研究结果表明，地球丰富和低成本的kuramite Cu 3SnS 4是一种替代的无铂对电极材料的染料敏化太阳能电池。
The density-functional theory calculations in this work clearly revealed that the kuramite-structure Cu3SnS4material possessing the metallic characteristic, result in the higher charge transfer between I3−ions and the Cu3SnS4surfaces, and the rapid redox transfer reaction of I3−/I−in dye-sensitized solar cells system. Then, a feasible and mild solution method was proposed to in-situ synthesize Cu-rich kuramite-structure Cu3SnS4thin film on FTO substrate, and the acquired thin film was used directly as counter electrode to assemble dye-sensitized solar cells without any post-treatments. The obtained-Cu3SnS4nanosheet film had good bonding strength, expanded surface area, low photoelectron charge transfer resistance at the counter electrode/electrolyte interface, and great catalytic activity toward the reduction of I3−/I−ions. Power conversion efficiency of 7.80% was obtained by utilizing Cu3SnS4nanosheet as counter electrode, which was superior to that of Pt electrode (6.52%). Our results demonstrate the earth-abundant and low-cost kuramite Cu3SnS4is an alternative Pt-free counter electrode material in dye-sensitized solar cells.