本實驗利用定電位電沉積的方式，於含有銦錫氧化物的導電玻璃上製備鈀銀合金薄膜，並將該合金薄膜應用於甲醇電氧化催化上。製備的方式有改變電鍍液中鈀、銀離子的比例、電沉積電位、錯合劑三乙醇胺濃度與氧化還原置換反應將合金中銀原子置換，修飾上鈀原子。並利用X光粉末繞射儀(XRD)、能量分散式光譜儀(EDS)、掃描式電子顯微鏡(SEM)與循環伏安法(CV)分別分析其結構、組成、形貌與催化效率等。
根據甲醇電氧化催化效率量測結果，於沉積電位-0.3 V下所製備之鈀銀合金催化效率優於純鈀並且優於其他沉積電位製備之合金。添加三乙醇胺後薄膜與基材的附著性與薄膜均勻性皆有所提升，同時X光粉末繞射儀分析顯示，電鍍液中添加三乙醇胺後製備之鈀銀合金粒徑有變小的現象，對於合金粒子的表面積具有增大的效果，在催化效率上提升約25 %。電鍍液中添加三乙醇胺之鈀銀合金薄膜，藉由氧化還原置換步驟，將合金表面以鈀原子修飾後，其鈀銀合金於催化效率上較未置換前提升約14 %，而該合金之銀含量達24.45 %，是本實驗甲醇電氧化催化效率最佳的鈀銀合金比例。

In this study, PdAg alloy thin film was fabricated by the method of co-electrodeposition on an ITO coated glass(PdAg/ITO) and investigated its application in electro-oxidation of methanol. The parameters include: individual ion concentration, deposition potential, concentration of triethanolamine(TEA) and Pd redox replacement. Redox replacement is replaced by Pd on the surface of as-prepared PdAg alloy film. The morphologies, composition, phase structures and catalytic efficiency of PdAg alloy were examined by scanning electron microscopy(SEM), energy-dispersive spectroscopy(EDS),X-ray diffraction(XRD) and cyclic voltammogram(CV).
We found that -0.3 V was the most suitable potential for deposition of PdAg alloy film, exhibits higher catalytic activity on methanol oxidation compared with pure Pd catalyst.
Adding triethanolamine in the electrolytes, PdAg alloy film may be more homogeneous and better adhesion with ITO. X-ray diffraction showed that the particle size of PdAg alloy deposit shrinks when the electroplating bath contained complexing agnet, triethanolamine. The decrease in particle size was beneficial to the increase of surface area of alloys. After adding, the catalytic efficiency was 25% higher than solution without TEA. Through Pd redox replacement, the alloy surface could be modified by Pd atom and the catalytic efficiency was about 14% higher than previous. This PdAg alloy with atomic ratio of 24.45% Ag owns the best catalytic efficiency in this study.

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