Development of BiOBr/TiO2 nanotubes electrode for conversion of nitrogen to ammonia in a tandem photoelectrochemical cell under visible light

Prita Amelia, J. Gunlazuardi
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Abstract

Ammonia (NH3) is one of the important chemicals for human life. The demand for ammonia is expected to increase every year. Conventionally, the fixation process of N2 to produce NH3 in the industrial sector is carried out through the Haber−Bosch process, which requires extreme temperature and pressure conditions that consume a high amount of energy and emit a considerable amount of CO2. Therefore, it is necessary to develop alternative technology to produce ammonia using environmentally friendly methods. Many studies have developed the photo-electrochemical conversion of nitrogen to ammonia in the presence of semiconductor materials, but the resulting efficiency is still not as expected. In this research, the development of the tandem system of Dye-Sensitized Solar Cell - Photoelectrochemistry (DSSC - PEC) was carried out for the conversion of nitrogen to ammonia. The DSSC cell was prepared using N719/TiO2 nanotubes as photoanode, Pt/FTO as cathode, and electrolyte I-/I3-. The DSSC efficiency produced in this research was 1.49%. PEC cell at the cathode and anode were prepared using BiOBr/TiO2 nanotubes synthesized by the SILAR (Successive Ionic Layer Adsorption and Reaction) method. The resulting ammonia levels were analyzed using the phenate method. In this study, ammonia levels were obtained at 0.1272 µmol for 6 hours of irradiation with an SCC (Solar to Chemical Conversion) percentage of 0.0021%.
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BiOBr/TiO2纳米管电极在串联光电电化学电池中氮转化为氨的研究
氨(NH3)是人类赖以生存的重要化学物质之一。对氨的需求预计每年都会增加。传统上,工业部门将N2固定为NH3的过程是通过Haber - Bosch工艺进行的,该工艺需要极端的温度和压力条件,消耗大量的能量并排放大量的二氧化碳。因此,有必要开发利用环保方法生产氨的替代技术。许多研究已经发展了在半导体材料存在下的氮到氨的光电转化,但所产生的效率仍然没有达到预期的效果。在本研究中,开发了染料敏化太阳能电池-光电化学(DSSC - PEC)串联系统,用于氮转化为氨。以N719/TiO2纳米管为光阳极,Pt/FTO为阴极,电解质I-/I3-制备DSSC电池。本研究产生的DSSC效率为1.49%。采用连续离子层吸附反应(SILAR)法制备了BiOBr/TiO2纳米管,制备了阴极和阳极的PEC电池。用苯盐法分析所得氨水平。在本研究中,以0.1272µmol照射6小时获得氨水平,SCC(太阳能到化学转化)百分比为0.0021%。
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来源期刊
CiteScore
4.50
自引率
16.00%
发文量
83
审稿时长
8 weeks
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