||The study of photoelectrochemical water splitting using n-GaN with NiOx & CoOx nanoparticles coating as the photoelectrodes
||Department of Photonics
Hydrogen generated by photoelectrochemical solar water splitting process has a great potential to provide the energy consumption. Gallium nitride (GaN) is the materials appropriate for solar water splitting system because its energy band position straddles the redox potential of water. However, n-type GaN (n-GaN) as photoanode has photo-corrosion event in the long-term experiment. In this research, we discuss the characteristics and photoelectrochemical (PEC) properties of Nickel Oxide (NiOx) and Cobalt Oxide (Co3O4) nanoparticles on n-GaN substrate by spin coating process. The various weight ratio of NiOx (1:5 and 3:2) and Co3O4 (1:1 and 1:5) were utilized in this study. These catalysts were covered on n-GaN to prevent photo-corrosion and decrease the solar water splitting reaction overpotential. Interestingly, NiOx nanoparticles can not only avoid the corrosion phenomenon on n-GaN surface, but also enhance photocurrent density while working electrode applied bias of 1V in two-electrode system. In stability test, the hydrogen evolution rate of NiO 3:2 was more rapid than the pristine n-GaN after 5 hours. This result indicates that NiOx nanoparticles covered on n-GaN can enhance lifetime and hydrogen production in PEC cells.
第一章 序論 1
1.1 前言 1
1.2 研究動機與文獻回顧 2
第二章 光電化學實驗系統 12
2.1 理論基礎 12
2.2 光電化學系統 23
2.3 實驗所需之儀器與藥品 32
第三章 探討氧化鎳 34
3.1 氧化鎳樣品製備與試片結構 34
3.2 氧化鎳薄膜特性分析 41
3.3 氧化鎳光電化學實驗數據分析與討論 57
第四章 探討氧化鈷 98
4.1 氧化鈷樣品製備與試片結構 98
4.2 氧化鈷薄膜特性分析 100
4.3 氧化鈷光電化學實驗數據分析與討論 111
第五章 結論與未來展望 127
5.1 結論 127
5.2 未來展望 128
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