低壓電漿改質鎳鈷金屬有機骨架材料於陰離子交換膜水電解器之應用

Abstract

在本研究中，利用鎳鈷合金有機骨架(Metal Organic Frameworks, MOF)生長在基板上，作為電催化劑，再進行低壓電漿進行表面修飾。量測電化學分析以及材料分析，最後應用於鹼性電解水模組中。 已經有不少研究顯示鎳鈷合金在有機金屬框架材料中，適合作為析氧反應的催化劑。為了得到高效能的催化劑，做了電漿處理對材料表面進行修飾，分別使用Ar, Ar/H2 (95:5) and Ar/O2 (95:5)作為工作氣體持續處理一分鐘，結果顯示，經過Ar, Ar/H2 (95:5) and Ar的氣體電漿處理，在LSV量測中，在100 mA/cm2的電流密度下，過電位可達到552、540 mV，以及Double-Layer Capacitance的增加，都說明了增加了產氧的活性，然而在電解水過程中，OER扮演重要的反應，也會影響整個系統的能量效率。 以Ar電漿處理的NiCo-MOF催化劑的電解槽在25℃、 500mA/cm2的電流密度下，能源效率從54.7%提高到62.5%。採用Ar電漿處理催化劑的鹼性水電解模組在25°C和70°C下的比能耗分別為5.20 kWh/m3和4.69 kWh/m3。由鹼性水電解模組的性能參數（例如氫氣生產率、單位能耗和能源效率），實驗結果表明，NiCo MOF 是一種用於鹼性水電解模組的高效 OER 電催化劑。經過低壓電漿表面修飾，並有助於增加催化表現。

In this study, nickel-cobalt alloy organic frameworks (Metal Organic Frameworks, MOF) were grown on substrates as electrocatalysts, followed by surface modification using low-pressure plasma. Electrochemical and material analyses were conducted, and the catalysts were ultimately applied in alkaline electrolysis water modules. Several studies have demonstrated that nickel-cobalt alloys in Metal Organic Frameworks materials are suitable catalysts for the oxygen evolution reaction (OER). To obtain efficient catalysts, plasma treatments were performed to modify the surface of the materials, using Ar, Ar/H2 (95:5), and Ar/O2 (95:5) as working gases for one minute each. Results showed that after treatment with Ar, Ar/H2 (95:5), and Ar plasma, the overpotentials reached 552, 540 mV at a current density of 100 mA/cm2 in LSV measurements, and an increase in Double-Layer Capacitance indicated enhanced oxygen evolution activity. However, during the electrolysis process, OER plays a crucial role and also affects the overall energy efficiency of the system. The energy efficiency of the NiCo MOF catalyst electrolyzer treated with Ar plasma at 25°C and 500 mA/cm2 increased from 54.7% to 62.5%. The specific energy consumption of the alkaline water electrolysis module using catalysts treated with Ar plasma was 5.20 kWh/m3 at 25°C and 4.69 kWh/m3 at 70°C. Experimental results based on performance parameters of the alkaline water electrolysis module (such as hydrogen production rate, unit energy consumption, and energy efficiency) demonstrate that NiCo MOF is an efficient OER electrocatalyst for alkaline water electrolysis modules. Surface modification via low-pressure plasma treatment contributes to enhancing catalytic performance.