Cobalt selenide nanorods used as a high efficient counter electrode for dye-sensitized solar cells

Cobalt selenide nanorods used as a high efficient counter electrode for dye-sensitized solar cells
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硒化钴纳米棒用作染料敏化太阳能电池的高效对电极

DOI:
10.1016/j.electacta.2015.03.226
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发表时间:
2015-06
影响因子:
6.6
通讯作者:
Lan Zhang
Lan Zhang
中科院分区:
材料科学2区
文献类型:
--
作者:
Dong Jia;Wu Jihuai;Jia Jinbiao;Wu Shaoyun;Zhou Pei;Tu Yongguang;Lan Zhang

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采用水热法制备了硒化钴(CoSe2)纳米棒,并将其用作染料敏化太阳能电池(DSSC)的高效无铂对电极(CE)。场发射扫描电子显微镜观察到CoSe2主要表现为纳米棒的形貌,这有利于载流子从其表面向氧化还原电解质的转移。循环伏安测试表明CoSe 2电极比Pt电极具有更大的电流密度。电化学阻抗谱显示,最佳条件下的CoSe2电极具有较低的串联电阻(8.034 Ω × cm2)和较低的电荷转移电阻(0.097 Ω·cm2)。在模拟100 mW·cm−2(AM 1.5)的太阳光照射下,基于CoSe2CE的DSSC实现了8.38%的功率转换效率,高于基于Pt CE的太阳能电池(7.83%)。
Cobalt selenide (CoSe2) nanorods are prepared by hydrothermal method and used as an efficient Pt-free counter electrode (CE) for dye-sensitized solar cells (DSSCs). Field emission scanning electron microscopy observes that CoSe2mostly exhibits a nanorod morphology, which facilitates change carrier transfer from their surface to redox electrolyte. Cyclic voltammogram measurement indicates that CoSe2electrode has larger current density than Pt electrode. Electrochemical impedance spectroscopy shows that the CoSe2electrode with optimal condition has low series resistance of 8.034 Ω × cm2and has low charge-transfer resistance of 0.097 Ω·cm2. Under simulated solar light irradiation with intensity of 100 mW·cm−2(AM 1.5), the DSSC based on the CoSe2CE achieves a power conversion efficiency of 8.38 %, which is higher than the solar cell based on Pt CE (7.83%).
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