- 學位論文
高效率水解產氫觸媒的開發
The development of high efficiency catalyst for water electrolysis.
摘要
「氫」能源逐漸成為新興能源，而水電解是一種簡易方便產氫方法。水電解方式中薄膜電極為其中一種，而在水電解產氫過程中，觸媒層為影響電解水產氫速率中最重要的部分。 主要分為三個方向:Ⅰ.研究商業化催化劑以及自行合成新型催化劑比較，首先探討商業化的觸媒(20% Pt- Vulcan-XC-72)水電解，分析其鉑均勻分散於碳，大小約為1.5~5.5 nm，產氫速率約為6.23 ml/min。而使用石墨烯/鉑複合式奈米材料當成觸媒，探討不同的石墨烯/鉑的製程，其中在反應的過程中使用聚二烯丙基二甲基胺鹽酸鹽當穩定劑，先吸附在氧官能基上形成一個活化位置，使的鉑因靜電作用力沉積在上面，其結果鉑也均勻分散於石墨烯上，大小約為4~6 nm，產氫速率約為3.67 ml/min；Ⅱ.研究水解產氫速率的條件，包含漿料隔水加熱所需要的時間以及質子交換膜在熱壓時的參數(溫度、壓力、時間)所造成的產氫速率影響，並且找到各自催化劑最佳的參數；Ⅲ.質子交換膜老化測試，檢驗水解膜的性能。 藉由傅立葉轉換紅外光譜儀(FT-IR)、穿透式電子顯微鏡(TEM)、X光繞射分析儀(XRD)來鑑定催化劑性質與使用掃描式電子顯微鏡(SEM)來檢測催化劑金屬在碳紙上的分佈情形，以及用單電池模組(single cell electrolyzer) 、老化測試(decay test)來分析水解膜性能。
並列摘要
Hydrogen (energy) has become one of the newly clean energy, and water electrolysis (or hydrogen evolution reaction (HER)) is the cleanest and easiest method to produce hydrogen. In particular, Proton Exchange Membrane (PEM)-based water electrolyzers give several advantages for hydrogen production. During the electrolysis process, the electrolysis efficiency is correlated to the catalyst layer which affect the oxygen/hydrogen production rate. The focus of this thesis is twofold. The first part is the comparison of commercial catalysts and synthesized catalysts. In commercial catalysts (20 % Pt-Vulcan-XC-72), platium nanoparticles (Pt-NP, 1.5~5 nm) were dispersed on carbon substrate and the hydrogen production rate was about 6.23 ml/min. A new hybrid materials using graphene as carbon substrate for the dispersion of Pt-NP has been prepared and as catalyst for hydrogen production in PEM-based water electrolyzers. During the reaction, poly(diallydimethyl ammonium) (PDDA) was used as a stabilizer to assist well-dispersion of Pt-NP on grapheme. The Pt-NPs were anchored randomly onto the reduced graphene oxide (RGO) sheets with Pt-NPs diameters of ~ 4-6 nm while the measured hydrogen evolution rate was around 3.67 ml/min. The second part is focus on the correlation between the hydrogen production rate of the electrolysis and the parameters for fabrication electrolyzers including the (duration, temperature) for paste formation and (pressure, duration) for hot press. The condition for hydrogen production has been optimized. The chemical and physical properties of Pt-NPs were characterized by FTIR、XRD, and TEM. The dispersion morphology of Pt-NPs on the carbon paper was characterized by SEM. The electrochemical activity of as-prepared Pt-NPs on water electrolysis was investigated in a single cell electrolyzer.
參考文獻
延伸閱讀
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