Wet chemical synthesis of S doped Co3O4 nanosheets/reduced graphene oxide and their application in dye sensitized solar cells
Wet chemical synthesis of S doped Co3O4 nanosheets/reduced graphene oxide and their application in dye sensitized solar cells
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S掺杂Co3O4纳米片/还原氧化石墨烯的湿法合成及其在染料敏化太阳能电池中的应用
DOI：
10.1016/j.apsusc.2018.04.148
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发表时间：
2018-08-30
影响因子：
6.7
通讯作者：
Li, Guang
中科院分区：
文献类型：
--
作者：
Jiang, Tongtong;Yin, Naiqiang;Li, Guang
尽管Co 3 O 4纳米材料因其优异的电化学性能而受到广泛关注，但其导电性和对I3-离子的催化还原能力较差，阻碍了其作为染料敏化太阳能电池（DSSC）对电极的应用。本文采用离子交换法制备了S掺杂的Co 3 O 4纳米片。S掺杂策略显著提高了Co 3 O 4纳米片对I-3离子还原的催化活性和电荷传输能力。为了同时向Co 3 O 4和rGO中掺杂S，在氧化石墨烯（GO）存在下，采用类似的湿化学工艺合成了S掺杂Co 3 O 4/还原氧化石墨烯（rGO）复合材料。Co 3 O 4-DSSC的功率转换效率（PCE）仅为1.98%。采用掺S的Co 3 O 4作为CE，PCE可以显著提高到6.76%。此外，S掺杂的Co_3O_4/rGO-DSSC显示出比Pt（7.79%）更高的PCE（8.24%）。电化学测试结果表明，S掺杂的Co 3 O 4/rGO复合材料不仅具有良好的电催化活性，而且具有较高的循环稳定性。掺杂S的Co 3 O 4纳米片和掺杂S的Co 3 O 4/rGO复合物作为CE的DSSC的显著改善的性能表明CE材料的表面原子构型对其电催化活性有显著影响。(C)2018年爱思唯尔B。V.保留所有权利。
Despite the fact that Co3O4 nanomaterials have gained much attention due to their excellent electrochemical properties, the poor conductivity and catalytic reduction ability for I-3 ion hinder their application as counter electrode (CE) of dye sensitized solar cells (DSSCs). Herein, a facile ion exchange approach is developed to prepare S-doped Co3O4 nanosheet. S doping strategy significantly improves the catalytic activity of Co3O4 nanosheets for the reduction of I-3 ion and their charge transport ability. For the sake of doping S into Co3O4 and rGO simultaneously, the similar wet chemical process is adopted in the presence of graphene oxide (GO) to synthesize S-doped Co3O4/reduced graphene oxide (rGO) composites. The power conversion efficiency (PCE) of Co3O4-DSSC is only 1.98%. Using S-doped Co3O4 as CE, the PCE can be dramatically improved to 6.76%. Moreover, the S-doped Co3O4/rGO-DSSC shows higher PCE (8.24%) than that of Pt (7.79%). Electrochemical measurement results indicate that the S-doped Co3O4/rGO composites not only show excellent electrocatalytic activity, but also show high cycling stability. The outstanding improved performance of DSSCs with S-doped Co3O4 nanosheet and S-doped Co3O4/rGO composite as CEs demonstrates that the surface atomic configurations of CE materials have significant influence on their electrocatalytic activity. (C) 2018 Elsevier B. V. All rights reserved.