文化大學機構典藏 CCUR:Item 987654321/26368
English  |  正體中文  |  简体中文  |  全文笔数/总笔数 : 46962/50828 (92%)
造访人次 : 12464480      在线人数 : 494
RC Version 6.0 © Powered By DSPACE, MIT. Enhanced by NTU Library IR team.
搜寻范围 查询小技巧：
  • 您可在西文检索词汇前后加上"双引号"，以获取较精准的检索结果
  • 若欲以作者姓名搜寻，建议至进阶搜寻限定作者字段，可获得较完整数据
    •  进阶搜寻
    主页 ‧ 登入 ‧ 上传 ‧ 说明 ‧ 关于CCUR ‧ 管理 到手机版


    jsp.display-item.identifier=請使用永久網址來引用或連結此文件: https://irlib.pccu.edu.tw/handle/987654321/26368


    题名: 鈀黑觸媒電催化甲酸氧化反應之動力學研究
    Kinetic Study on Electrocatalytic Formic Acid Oxidation Reaction at Pd-Black Catalysts
    作者: 謝宗達
    林仁斌
    贡献者: 化材系
    关键词: 鈀
    電催化
    甲酸
    Nafion
    燃料電池
    Pd
    electrocatalysis
    formic acid
    Nafion
    fuel cells
    日期: 2012-06
    上传时间: 2013-12-04 11:15:25 (UTC+8)
    摘要: 本研究以薄膜電極方法探討鈀黑(Pd-black)觸媒在酸性電解質溶液中電催化甲酸氧化的反應動力學。利用循環伏安法多次掃描得知Pd-black 電極的氫吸/脫附電荷量會隨著掃描圈數的增加而漸漸減少，這是由於Pd 觸媒表面化學吸附H+離子所致。再者，氫吸附peak I (-0.125V vs. Ag/AgCl)對氫的化學吸附活性明顯高於氫吸附peak II (0.043Vvs. Ag/AgCl)，這些現象將降低Pd-black 觸媒在酸性電解質溶液中的電化學活化面積，並導致觸媒活性與壽命的減退。利用線性掃描伏安法所求得甲酸分子在Nafion 覆蓋Pd-black 薄膜電極中的擴散係數為1.3×10-6 cm2s-1。與以計時安培法並藉由Cottrell 方程式所求得的擴散係數值具有相同的數量級(10-6)。所求得擴散係數值上的些微差異可歸因於實驗誤差。

    In the work, the reaction kinetics of electrocatalytic formic acid oxidation at Pd-black catalyst in acid electrolyte was investigated using a thin-film rotating disk electrode configuration. The cyclic voltammetric results showed that the charge for H-adsorption/desorption of the electrode was gradually reduced with the prolonged potential cycling. This could be attributed that the Pd catalyst surface was chemically absorbed by H+ ions.Moreover, H-adsorption peak I (-0.125V vs. Ag/AgCl) significantly exhibited higher chemsorption activity than that for H-adsorption peak II (0.043V vs. Ag/AgCl). This effect would reduce the electrochemical active surface and in turn caused a decrease in the overall catalytic activity of Pd-black. The diffusion coefficient of formic acid at the Nafion-covered Pt-black electrode was determined to be 1.3×10-6 cm2s-1 by the linear sweep voltammetry.Compared to the data obtained by chronoamperometry using the Cottrell equation, the values
    of the diffusion coefficient were with the same order of magnitude. The small differences by these two methods were due to the experimental errors.
    關聯: 華岡工程學報 n.29 p.29-34
    显示于类别:[工學院] 學報-華岡工程學報

    文件中的档案:

    档案 描述 大小格式浏览次数
    index.html0KbHTML597检视/开启
    index.html0KbHTML383检视/开启


    检视Licence

    在CCUR中所有的数据项都受到原著作权保护.

    DSpace Software Copyright © 2002-2004  MIT &  Hewlett-Packard  /   Enhanced by   NTU Library IR team Copyright ©   - 回馈