Citation: SHI Ji-Fu, FAN Ye, XU Xue-Qing, XU Gang, CHEN Li-Hua. Influence of Preparation Conditions on the Properties of Cu₂S Photocathodes[J]. Acta Physico-Chimica Sinica, ;2012, 28(04): 857-864. doi: 10.3866/PKU.WHXB201202204 shu

Influence of Preparation Conditions on the Properties of Cu₂S Photocathodes

1.
Guangzhou Institute of Energy Conversion, Key Laboratory of Renewable Energy and Gas Hydrate, Chinese Academy of Sciences, Guangzhou 510640, P. R. China

Received Date: 11 November 2011
Available Online: 20 February 2012
Fund Project: 国家自然科学基金(21103194, 21073193) (21103194, 21073193) 广州市珠江科技新星专项(2012061) (2012061)中国科学院广州能源研究所所长创新基金(y007r71001)资助项目 (y007r71001)

Cu₂S nanomaterials were prepared, and the influence of preparation conditions on the morphology and catalytic reduction of sodium polysulfide was investigated. The Cu₂S photocathode prepared under optimal conditions was used as a quantum-dot-sensitized solar cell. For preparation of the Cu₂S photocathodes, HCl pretreatment and reaction with sodium polysulfide were important processes. The Cu₂S photocathodes had petal-like structures composed of nano-plates. The Cu₂S photocathodes become rough and porous, which increased the surface area, as the HCl concentration increased and pretreatment time was prolonged. As a result, interfacial charge transfer resistance between the Cu₂S electrodes and polysulfide electrolyte decreased. Because the reaction between Cu and sodium polysulfide is very fast, the reaction time should be controlled. Otherwise, the Cu₂S film will fracture. For od catalytic performance of the Cu₂S photocathodes, the best preparation conditions were 30% HCl, pretreatment time for 40 min, and reaction with sodium polysulfide for 10 s. The quantum-dot-sensitized solar cell showed a high photoelectric conversion efficiency of 4.01%.
- Cu₂S,
- Photocathode,
- Interfacial charge transfer resistance,
- Impedance,
- Quantum-dotsensitized solar cell
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沈阳化工大学材料科学与工程学院沈阳 110142

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通讯作者: 陈斌, bchen63@163.com

Influence of Preparation Conditions on the Properties of Cu₂S Photocathodes