共催化劑修飾之矽基光電極材料應用於光催化水分解

近期全球能源消耗速率每年約為15 TW，發展再生能源來取代石化燃料與核能為刻不容緩之研究，於1972年，Honda與Fujishima首度嘗試將太陽能轉變為化學能，並提出光催化水分解(solar water splitting)之概念，當使用水分解產生之氫氣時，環境友善之水蒸氣為其唯一產物，故光催化水分解為一理想解決全球能源危機之方式。於眾多不同之半導體中，矽材料(silicon; Si)因其較小之能隙與較負之導帶邊界，因此矽光陰材料可幾乎吸收全太陽光可見光光譜，並進行光催化產氫反應，而被視為極佳之光催化水分解陰極電極，然矽光陰極材料因光激發載子動能不足，使其光電化學表現不佳，此外當其接觸水溶液電解液時，於表面易生成絕緣之氧化層造成光催化活性衰退或去活性。於此論文中，三大主要策略被發展改善矽光陰極材料之效率與穩定性，表面電漿共振(surface plasmon resonance)金屬粒子與共催化劑(co-catalyst)材料用於提升矽光陰極材料之表現，此外鈍化層(passivation layer)則做為保護層提高其穩定度。

關鍵字

光催化水分解；共催化劑；矽基光電極

並列摘要

The current global energy consumption rate is approximately 15 TW per year. Developing a renewable energy resource as a substitute for fossil fuels and nuclear power is a research topic that needs attention. In 1972, Honda and Fujishima first demonstrated the conversion of solar energy into chemical fuels by splitting water. The only product of using hydrogen gas from water photoelectrolysis is environmental friendly water vapor. Therefore, solar water splitting is an optimal method for solving the energy crisis. Among numerous semiconductor materials, silicon (Si) is the optimal photocathode because of its small band gap and negative conduction band edge. Consequently, Si photocathode absorbs the visible light of solar spectrum and drives solar hydrogen evolution reaction. However, the low kinetics of photo-induced carriers in Si photocathode restricted its photoelectrochemical performance. Moreover, the formation of an insulating oxidation layer on Si photocathode during the exposure of aqueous electrolyte contributed to its photocatalytic degradation or deactivation. In the present study, three dominant strategies were developed to improve the performance and durability of Si photocathode. Surface plasmon resonance metal particles and co-catalyst material modification were applied to enhance the efficiency of the Si photocathode. A passivation layer served as a protective shell that is attached to the Si photocathode to increase its stability.

並列關鍵字

Solar Water Splitting ； Co-catalyst ； Si-based Photoelectrode

參考文獻

References (Chapter 1)

[3] Tachibana, Y.; Vayssieres, L. and Durrant, J. R. "Artificial Photosynthesis for Solar Water-splitting" Nat. Photon. 2012, 6, 511.

[5] Chen, H. M.; Chen, C. K.; Liu, R. S.; Zhang, L.; Zhang, J. and Wilkinson, D. P. "Nano-architecture and Material Designs for Water Splitting Photoelectrodes" Chem. Soc. Rev. 2012, 41, 5654.

[6] Kudo, A. and Miseki, Y. "Heterogeneous Photocatalyst Materials for Water Splitting" Chem. Soc. Rev. 2009, 38, 253.

[7] Liu, C.; Dasgupta, N. P. and Yang, P. "Semiconductor Nanowires for Artificial Photosynthesis" Chem. Mater. 2014, 26, 415.

國際替代計量

共催化劑修飾之矽基光電極材料應用於光催化水分解

全文下載

主題瀏覽