【學術亮點】熵穩定化對高熵棕鐵礦促進析氧反應的影響
【學術亮點】：Effect of Entropy Stabilization on High Entropy Brownmillerites for Boosting Oxygen Evolution Reaction
Facility Agricultural: Green Energy Development and Carbon Offset【Department of Chemical Engineering / Chen, Chih-Ming/ Distinguished Professor】
設施農業：農業綠能開發與碳匯補償【化學工程學系陳志銘 特聘教授】
論文篇名 英文：Effect of Entropy Stabilization on High Entropy Brownmillerites for Boosting Oxygen Evolution Reaction
中文：熵穩定化對高熵棕鐵礦促進析氧反應的影響
期刊名稱 Electrochimica Acta
發表年份,卷數,起迄頁數 2025, 538, no.146960
作者 Pitchai, Chandrasekaran; Vedanarayanan, Mahalakshmi; Kuo, Yi-Cheng; Liu, Heng-Jui; Chen, Chih-Ming(陳志銘)*
DOI 10.1016/j.electacta.2025.146960
中文摘要 為提高氧析出反應的電催化劑效率，構型熵已成為關鍵的設計參數。本研究系統研究將鍶基褐鐵礦中B位元素的數量從三個（低熵）增加到五個（高熵）對其結構特徵和電催化性能的影響。結構分析表明，增加構型熵有助於穩定褐鐵礦相並抑制合成粉末中雜質相的存在。電化學評估，包括線性掃描伏安法、電化學阻抗譜和計時電位法，顯示構型熵最高的樣品在 10 mA cm−2 時實現最低過電位 222.3 mV，表現出最小的塔菲爾斜率 66.1 mV/dec，並且在 100 小時內保持顯著的穩定性。這些結果強調熵在增強褐鐵礦催化劑的結構穩定性和電子性能方面的關鍵作用，使得高構型熵成為先進能源轉換技術的一種非常有效的方法。
英文摘要 Enhancing electrocatalyst efficiency for the oxygen evolution reaction (OER) has brought configurational entropy into focus as a critical design parameter. This work systematically examines how increasing the number of B-site elements in strontium-based brownmillerites from three (low entropy) to five (high entropy) affects their structural features and electrocatalytic performance. Structural analysis indicates that increased configurational entropy helps stabilize the brownmillerite phase and suppresses the presence of impurity phases in the synthesized powders. Electrochemical evaluations, including linear sweep voltammetry (LSV), electrochemical impedance spectroscopy (EIS), and chronopotentiometry, demonstrate that the sample with the highest configurational entropy achieves the lowest overpotential of 222.3 mV at 10 mA cm−2, exhibits the smallest Tafel slope of 66.1 mV/dec, and maintains remarkable stability over 100 hours. These results emphasize the key role of entropy in strengthening the structural stability and electronic performance of brownmillerite catalysts, making high configurational entropy a highly effective approach for advanced energy conversion technologies.
發表成果與本中心研究主題相關性 電解水產氫是可再生能源的重要發展策略，是提供設施農業自主能源供給的可行方向之一。