由於近年來對可再生能源的重視，以及全球暖化等環境議題興起了淨零碳排等風潮，氫能科技因其蘊藏量豐富且屬於潔淨能源，引起了相當多的關注及研究。其中化學產氫材料因其屬於自發性化學反應，不需要額外供給能量就可產生能量密度極高的氫氣，可結合氫燃料電池應用於可攜式發電裝置，具備相當大的發展價值。
本實驗利用粒徑只有數百奈米的矽奈米顆粒(Silicon nanoparticle)，使用氫氧化鈉水溶液當作反應催化劑，調控反應條件及鹽類添加劑種類，致力於發展出流量穩定且持續時間長的產氫材料。研究可分為兩個部分，第一部分是調整溶液濃度、pH值、系統溫度等多種變因，探討氫氣產生過程中發生的反應機制。第二部分則是觀察鹽類添加劑對反應的效益，找出最適合的反應條件，並對反應機制作完整的解釋。
本研究透過不同濃度的氫氧化鈉催化劑，與矽奈米顆粒發生化學反應，分析氫氣流量隨時間的變化趨勢，並針對反應副產物進行內部鍵結及表面形貌分析，徹底了解產氫反應過程是由哪些因素造成流量出現峰值或平台區。XPS結果顯示在出現最高流量的同時，矽奈米顆粒的原子價數由原本的0大量產生以Si_2 O_3 (Si^(3+) )形態存在的中間產物，矽原子的反應趨勢隨時間呈現Si^(2+)Si^(3+)Si^(4+)逐漸增加。
添加NaCl到溶液中的產氫反應，相比其他添加劑，在室溫條件下能有效提升氫氣輸出，以0.15M NaOH_((aq))和0.5M NaCl_((aq))為反應溶液，進行產氫反應，能產生本實驗最大的氫氣流量，維持0.05slm/g Silicon的穩定流量達到20分鐘的時間，同時也具有最大的氫氣總產率 (79.4%)。其作用機制為加入的NaCl能抑制矽顆粒表面被生成的矽酸溶膠層給完全包覆，產生多孔狀的表面形貌，使得更多內層矽原子得以發生反應，以增加氫氣分子的釋出。此推論可從SEM影像直接得到證實，也是第一個觀察到矽奈米顆粒產氫反應過程材料微結構變化的研究。

In our work, the mechanism of hydrogen generation produced by silicon nanoparticle was studied and the effect of salt additives toward hydrogen yield was discussed clearly. The characterizations by SEM and XPS revealed that the silicon nanoparticle clustered together and forming a bigger particle structure during reaction, which leaded to the incomplete hydrogen generation process. The experiment using 0.5M NaCl in 300ml 0.15M NaOH solution as the reactant showed the best hydrogen flowrate, 0.05slm per gram of silicon lasted for 20 minutes, and the best hydrogen yield, 79.4%. It was proved by SEM image that adding NaCl into chemical solution could reduce the formation of silicate sol-gel layer and the surface morphology of silicon nanoparticle turned into porous structure. More silicon atoms are available through this structure, thus improving the hydrogen generation rate and total output.

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