Sulfur-doped cobalt oxide nanowires as efficient electrocatalysts for iodine reduction reaction

JOURNAL OF ALLOYS AND COMPOUNDS

卷:772

Article

Liang, Wentao¹  Fan, Kaicai¹  Luan, Yemei^1,2  Tan, Zhijin¹  Al-Mamun, Mohammad¹  Wang, Yun¹  Liu, Porun¹  Zhao, Huijun¹ 

[1] Griffith Univ, Sch Environm & Sci, Ctr Clean Environm & Energy, Gold Coast Campus, Southport, Qld 4222, Australia

[2] Hebei Univ Sci & Technol, Coll Text & Garment, Shijiazhuang 050018, Hebei, Peoples R China

关键词: Vapor-phase hydrothermal method;    Sulfur doping;    Iodine reduction reaction;    Electrocatalyst;    Dye-sensitized solar cells;   

DOI  :  10.1016/j.jallcom.2018.09.048

来源: Elsevier

【 摘 要 】

Sulfur-doped cobalt oxide (S-Co3O4) crystals exhibit excellent catalytic activities towards multiple useful reactions, however, the impact of the structural properties on the resultant catalytic activities has been overlooked in the past. We demonstrate a facile vapor-phase hydrothermal (VPH) doping approach to effectively create electrocatalytically active surface sulfur species on the chemical bath deposited poly-crystalline Co3O4 nanowires for iodine reduction reaction (IRR). The dye-sensitized solar cells (DSSCs) equipped with the S-Co3O4 nanowire film as the counter electrode (CE) achieve a best energy conversion efficiency of 6.78%, which is comparable to those of DSSCs with commercial Pt CE (7.36%). The impact of film structure, VPH temperature and VPH duration on the resultant structures as well as the electro-catalytic activities has been comprehensively studied. More importantly, our results manifest a close correlation between the surface sulfur dopant level and the key electrocatalytic activity indicators. The VPH approach could be further extended to the fabrication of low-cost, high-performance nanomaterials for energy conversion applications. (C) 2018 Elsevier B.V. All rights reserved.

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