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題名 | Voltammetric Investigation of Nickel-Platinum Codeposits for Methanol Oxidation in KOH Solutions=鎳鉑共鍍層在氫氧化鉀溶液中對甲醇氧化之伏安研究 |
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作者 | 溫添進; 胡哲豪; 胡啟章; | 書刊名 | Journal of the Chinese Institute of Chemical Engineers |
卷期 | 30:6 1999.11[民88.11] |
頁次 | 頁515-524 |
分類號 | 461.63 |
關鍵詞 | 鎳鉑共鍍層; 氫氧化鉀溶液; 甲醇氧化; 伏安; Nickel-platinum codeposits; Cyclic voltammetry; Electrocatalytic activity; Methanol oxidation; |
語文 | 英文(English) |
中文摘要 | 本文乃是利用循環伏安法研究鎳鉑共鍍層在鹼性溶液之電化學行為與其對甲醇氧 化之電觸媒活性。當鉑原子百分比約為 60 時,鎳鉑共鍍層上對甲醇氧化之電觸媒活性達到 最高。不論是否經過蝕刻,鉑在鎳柏共鍍層上對甲醇氧化之電觸媒活性主要取決於鎳鉑共鍍 層未經蝕刻前之組成。水合程度較高之 Pt( Ⅳ ) 氧化物,對甲醇氧化與氧氣產生反應都有 較佳的電觸媒活性。Pt(OH)ads 氫氣化物中間體則是在正負掃描之較低電位範圍內,對甲醇 氧化具備電觸媒活性之物種。 |
英文摘要 | The electrochemical and electrocatalytic properties of Ni-Pt codeposits for methanol oxidation in an alkaline medium were characterized by cyclic voltammetry. The Ni-Pt codeposit with ca. Pt 60 a/o was found to exhibit the maximal activity for the oxidation of methanol in the low potential range. The electrocatalytic activity of all Ni-Pt codeposits (before and after leaching) for methanol oxidation was found to depend on their original compositions/textural properties before leaching. The hydroxyl Pt( Ⅳ ) species with a higher hydrated property possessed a higher activity for the methanol oxidation and oxygen evolution reactions (OER) . The presence of a hydroxyplatinum intermediate, Pt (OH)ads, was proposed to be responsible for the anodic peaks of methanol oxidation in the less positive potential region on both positive and negative sweeps. |
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