色素敏化染料
锐钛矿
光伏系统
功率(物理)
环境科学
材料科学
工程物理
工程类
电气工程
光催化
化学
物理
量子力学
电解质
物理化学
催化作用
生物化学
电极
作者
Oishy Roy,Muhammad Shahriar Bashar,Syed A. M. Tofail,Ehtsham Ul Haq,Fahmida Gulshan
标识
DOI:10.34133/energymatadv.0148
摘要
Beach and river sand deposits in Bangladesh can be a potential global source of sustainable extraction of nanocrystalline anatase used as electron transport layers in dye-sensitized solar cells (DSSCs). We demonstrate up to 0.77 mW/cm 2 power density in DSSCs made with nanocrystalline anatase processed from a sustainable source of beach sands from Cox’s Bazar, Bangladesh. This anatase was produced using simple, and scalable, hydrometallurgical extraction of the nanocrystalline anatase form of titania (TiO 2 ) from natural beach sand. An extensive range of physicochemical characterizations showed that we were able to produce nanocrystalline anatase of an average crystallite size of 8.6 to 11.6 nm and reasonable phase purity with the presence of carbon, nitrogen, sulfur, phosphorus, and silicon impurities. Screen-printed thick films made from these anatase particles showed a 2.90- to 2.95-eV bandgap for an indirect transition and a 3.06- to 3.13-eV bandgap for a direct transition, with the absorption edge lying in the range of 340 to 450 nm and the Urbach energy in the range of 0.62 to 0.97 eV. These properties compare fairly well with those of nanocrystalline anatase reported in the literature. Interestingly, we showed that the properties of the anatase extracted can be adjusted using hydrometallurgical parameters that affect the phase purity of the precursor extracted from the beach sands. Our investigation uncovers the potential of Cox’s Bazar beach sand as a potential global source of sustainable anatase for DSSCs and other photocatalytic applications.
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