以固態氧化物燃料電池去除氮氧化物之電化學提升研究

Electrochemical Enhancement of Nitric Oxide Removal via Solid Oxide Fuel Cells

林育賢(Yu-Hsien Lin)

指導教授 ： 黃大仁

國立清華大學/工學院/化學工程學系/碩士(2011年)

摘要

本研究之固態氧化物燃料電池(solid oxide fuel cell, SOFC)利用YSZ (yttria stabilized zirconia)電解質和Ni-YSZ陽極材料組成之陽極支撐型半電池，以La0.6Sr0.4CoO3-δ-Ce0.9Gd0.1O2-x陰極材料進行塗佈。於600 ℃下，陰極氣體通入模擬富氧燃燒(lean-burn)引擎廢氣，分別在不同的定電壓、開路電壓以及陽極通入惰性氣體情況下進行。當電壓產生時，即對NO催化分解有電化學提升的效果，增加NO轉化率；隨著NO濃度降低其NO轉化率亦上升。增加O2濃度有利於NO的催化分解。在高操作電壓和高氧濃度下進行NO催化分解可以得到較高的NO轉化率和較低的陽極燃料消耗。另外NO轉化率隨著C3H6和SO2的添加有所提升。這些都對於利用固態氧化物燃料電池去除富氧燃燒引擎所排放廢氣之NO具有相當大的幫助。

關鍵字

固態氧化物燃料電池 ； 氮氧化物 ； 電化學提升

並列摘要

A solid oxide fuel cell (SOFC) unit is constructed by coating La0.6Sr0.4CoO3-δ-Ce0.9Gd0.1O2-x as the cathode onto a disk of anode- supported bilayer of yttria-stabilized zirconia (YSZ) and Ni-YSZ. The SOFC operation is performed at 600 ℃ with a cathode gas simulating the lean-burn engine exhaust and at various fixed voltage, at open-circuit voltage, and with an inert gas flowing over the anode side, respectively. Electrochemical enhancement of NO decomposition occurs when the voltage is generated; smaller NO concentration results in larger NO conversion. Higher O2 concentration leads to higher enhancement. Higher operating voltage and higher O2 concentration can lead to both higher NO conversion and lower fuel consumption. Additionally, the NO conversion increases with the addition of C3H6 and SO2 into the cathode gas. These are beneficial for the application of the SOFCs to NO removal from lean-burn engine exhaust.

並列關鍵字

SOFC ； NO ； Electrochemical enhancement

參考文獻

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