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Title: | 二氧化鈦/氧化亞銅 核殼奈米線光電化學電池之研究 A Study on The TiO2/ Cu2O Core-shell Nanowires for Photoelectrochemical Cells |
Authors: | Shin-Yu Wei 魏辛宇 |
Advisor: | 張顏暉 |
Keyword: | 二氧化鈦,氧化亞銅,核殼奈米線結構,光電化學電池,氫氣, TiO2,Cu2O,core-shell nanowires,photoelectrochemical cells,hydrogen, |
Publication Year : | 2010 |
Degree: | 碩士 |
Abstract: | 近來太陽能電池和氫能源都因為是乾淨能源而受到大家矚目。藉由太陽光照射光觸媒能使水分解成氫氣及氧氣,具有將太陽能直接轉換成化學能儲存於氫燃料電池中的優點。在此篇論文中我們利用二氧化鈦/氧化亞銅奈米線當作光觸媒,將太陽的能量轉換成氫燃料電池的能源。
在本論文中我們發現金在成長二氧化鈦奈米線中扮演了一個很重要的角色,我們在鈦金屬(99.7%)的表面濺鍍上一層5奈米的金,在高溫的環境下利用Vapor-Liquid-Solid機制成長出良好品質的二氧化鈦奈米線。在沉積氧化亞銅時,我們以二氧化鈦接出銅線後當作工作電極,利用三極電鍍的方式通以適當偏壓,在鹼性電解液的環境中成長出氧化亞銅薄膜於二氧化鈦奈米線上。 在光線的照射下,二氧化鈦/氧化亞銅奈米線產生的光電流值,比起單純只有二氧化鈦奈米線產生的光電流的值增加了七倍之多。這表示二氧化鈦/氧化亞銅奈米線結構確實幫助二氧化鈦吸收更多光線,也由於二氧化鈦/氧化亞銅屬於type-II結構,能幫助電子電洞對的分離,使得效率能更加提升。我們研究顯示了二氧化鈦/氧化亞銅奈米線陣列確實是具有光電化學電池的潛力。 Solar cells and hydrogen fuel cells have attracted much attention recently because they are the sources of clean energy. Using sun light to decompose water into H2 and O2 has the advantage that light energy is transferred directly into chemical energy and the energy is stored directly in the hydrogen fuel cell. In this thesis we report the study of using TiO2 /Cu2O nanowire array to transfer light energy into chemical energy and store the energy in the hydrogen fuel cell. In our study we found that Au layer plays an important role in the growth of the TiO2 nanowires. Good quality TiO2 nanowires can be grown when a thin layer of Au was sputtered on top of a Ti (99.7%) and with the nanowires grown at high temperature using Vapor-Liquid-Solid method. The electrochemical deposition of Cu2O films was conducted in an alkaline electrolyte solution with TiO2 and Cu as working electrode and Cu2O oxide can be deposited on TiO2 nanowires by applying suitable voltage. We found that when the TiO2/Cu2O nanowire array is exposed to light illumination, the photocurrent generated in the TiO2/ Cu2O core-shell nanowire array increased seven times as compared with the photocurrent generated by the bare TiO2 nanowirarray. This result is attributed to the enhanced light absorption of TiO2/ Cu2O nanowires and the electron-hole separation due to the type-II band alignment of the TiO2/ Cu2O heterostructure. Our results indicate that TiO2/ Cu2O nanowire array is a promising system in making hydrogen fuel cell. |
URI: | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/46411 |
Fulltext Rights: | 有償授權 |
Appears in Collections: | 應用物理研究所 |
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