LaMnO3陰極觸媒的製作與在鹼液中之性能評估

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Title:	LaMnO3陰極觸媒的製作與在鹼液中之性能評估 Preparation of cathode catalyst LaMnO3 and its performance in alkaline solutions
Authors:	邱承賢
Contributors:	材料科學與奈米科技研究所
Keywords:	氧氣濃縮器旋轉電極氧還原反應交換電流密度 LaMnO3/C MRHP Levich plot Tafel slope
Date:	2006
Issue Date:	2014-09-09 11:32:35 (UTC+8)
Abstract:	本研究目的為氧氣濃縮器(Oxygen Concentrator)陰極電極材料的探討，利用Modified Reverse Homogeneous Precipitation (MRHP)方法來製作LaMnO3/C觸媒，其中碳材選用Vulcan XC-72R、Black Pearls 2000。自製觸媒以掃描式電子顯微鏡（SEM）、能量散佈分析儀（EDS）及X光粉末繞射分析儀（XRPD）鑑定其成分、比例、表面狀態及觸媒顆粒大小，之後再進行電化學測試。電化學測試包括了循環伏安法量測及利用旋轉電極(RDE)進行氧氣還原極化區線(I-V curve)量測，分析自製觸媒(LaMnO3/C)對氧還原性能之評估並與商用E-TEK 10% Pt/C比較。由實驗結果顯示，自製觸媒(LaMnO3/C)對氧氣還原性能為30% LaMnO3/C最佳，與E-TEK 10% Pt/C比較，開始產生電流之過電位30% LaMnO3/C比E-TEK 10% Pt/C大0.1V，在電流0.6mA下，30% LaMnO3/C比E-TEK 10% Pt/C大0.2V，顯示出E-TEK氧還原性能優於30% LaMnO3/C。本實驗以RDE (Rotating disk electrode)進行氧還原反應(ORR)測試，在混合控制(mixed-controlled)下來解析氧氣還原反應，利用Levich plot、Koutecky-Levich plot分析，可計算出n、B、ik值。由Tafel slop分析來評估鹼液中氧還原反應之交換電流密度(io)，i0表示在平衡狀態下的電流密度，決定了某各材料對反應快慢的代表。 The study of oxygen reduction by using carbon supported oxide (LaMnO3/C) in alkaline system is a potential cathode to be used in a oxygen concentrator and LaMnO3 is made by using modified reverse homogeneous precipitation (MRHP) approach. The BP2000 and Valcan XC-72R are two kinds carbon supports used for comparison of catalysts support effect.The characterization of synthesized materials are analyzed by using SEM , XRD and electrochemical cyclic voltammetry.The oxygen reduction reaction are carried by using commericial available platinum materials and MRHP process oxide materials.The forced-convection rotating disk electrode studies are used in evaluating oxygen reduction reaction. Levich plot and Tafel slope are used to study the electrochemical catalysis effects of materials.
Appears in Collections:	[Department of Chemical & Materials Engineering] thesis

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