製備氧化鋅奈米柱於奈米金線上於可撓式電極及其光電化學特性

Abstract

在本論文中，我們利用電化學沉積法於可撓式電極上製備具高表面積的奈米金線結構 (長約10 - 20 nm, 直徑約 20 - 90 nm)，再將氧化鋅奈米柱 (長約100 - 150 nm, 直徑約 90 - 110 nm)電沉積於導電性良好的奈米金線表面，成功製備了此複合材料，可作為可撓式的光陽極。此複合材料因其結構可提高電子和電洞分離的效率以及電子傳導效率。在製備複合材料過程中，藉由調控實驗的伏特數以及硝酸鋅濃度，可以成功地在奈米金線上成長出不同形貌的氧化鋅納米結構。 接著在光電流測試中，將所製備的複合結構材料分別在紫外可見光以及可見光下進行測試。實驗結果顯示在含有紫外光的光源照射下，氧化鋅奈米柱沉積於奈米金線上其光電流值為 3.51 mA/cm2，且在十次開關燈後仍可得到光電流值2.91 mA/cm2。而在可見光光源照射下，則可得0.35 mA/cm2 的光電流。因此，此研究在未來為氫燃料世代中，預期此複合材料的發展在將來具有極高的發展潛力。

In this study, we fabricated Au nanowires (NWs)/ZnO nanorods (NRs) hybrid material on flexible substrate as photoanode. This hybrid material is high surface area Au NWs (length 10 - 20 nm, diameter 20 - 90 nm), and loaded ZnO NRs (length 100 - 150 nm, diameter 90 - 110 nm) on its surface via direct current electrochemical deposition. By varying the applied potentials, and concentration of Zn(NO3)2, we successfully synthesized different nanostructures of ZnO loaded on Au NWs. The photocatalytic activity of the as-prepared hybrid material was investigated by the photocurrent generated under UV-Vis and visible light irradiations, respectively. In the photoelectrochemical test, Au NWs/ZnO could attain an improved photocurrent density of 3.51 mA/cm2 in UV-Visible irradiation; and 0.35 mA/cm2 in visible irradiation at + 1.0 V vs. Ag/AgCl. After 10 cycles under the UV-Visible light on/off illumination, 83 % of the original photocurrent was retained. As the whole, our working has opened a promising avenue to developing the photoanode for clean hydrogen fuel generation in the future.