使用噴墨技術用於製備Ni-MOF衍生的NiPt雙原子之自支撐電極於析氫反應

Abstract

摘要 有機金屬框架 (Metal Organic Framework, MOF) 是為金屬離子/金屬簇結合有機配體所組成的一種新穎的孔洞材料，因其具有高比表面積、高孔隙率、結構可調節性，常被應用於催化劑、電容材料、氣體儲存等等…。 本研究旨在探索使用單原子金屬電催化劑與雙原子電催化劑的差別，以及使用噴墨技術，將基材與MOF材料緊密結合，減少使用黏著劑，避免活性位點被遮蔽，目的是希望可以創建出穩定且有效的電催化劑。實驗通過在三聚氰胺海綿上噴墨列印 NiPt-MOF 前驅體，並進行高溫熱解和進行酸洗處理，製造出了一種負載在海綿碳上的 NiPt 雙原子自支撐電極又稱NiPt DAs/CMS。通過像差校正透射電子顯微鏡證實了均勻且隨機分佈的雙原子型態。並用來進行一系列的電化學產氫，以及研究機制。NiPt DAs/CMS 在電流密度為10 mA/cm2 的酸性和鹼性介質中分別具有91和71 mV的低過電位，相應的塔弗斜率值為48和76 mV/dec，其表現於酸性介質中保持恆定的析氫過電位長達27小時而不衰減。

Abstract Metal Organic Framework (MOF) is a novel porous material composed of metal ions/metal clusters bound to organic ligands, which is often used in catalysts, capacitive materials, gas storage, etc., due to its high specific surface area, high porosity, and structural stability. The purpose of this study was to explore the differences between the use of single-atomic metal electrocatalysts and diatomic electrocatalysts, as well as the use of inkjet technology to tightly combine the substrate with the MOF material, reduce the use of adhesives, and avoid the occlusion of the active site, with the aim of creating a stable and effective electrocatalyst. In this experiment, a NiPt diatomic self-supporting electrode, also known as NiPt DAs/CMS, was fabricated by inkjet printing of NiPt-MOF precursor on melamine sponge, high-temperature pyrolysis and pickling treatment. The uniform and randomly distributed diatomic pattern was confirmed by aberration-corrected transmission electron microscopy. It is also used to carry out a series of electrochemical hydrogen production, as well as to study the mechanism. NiPt DAs/CMS have low overpotentials of 91 and 71 mV in acidic and alkaline media with current densities of 10 mA/cm2, respectively, and corresponding Tarver slope values of 48 and 76 mV/dec, which are manifested by maintaining a constant hydrogen evolution overpotential in acidic media for up to 27 hours without attenuation.