利用3D奈米結構提升二硫化鐵做為析氫觸媒之效能

Abstract

摘要 氫能是一個乾淨的能源，在其能源的釋放過程中不會產生危害地 球的溫室氣體，例如二氧化碳及甲烷等。因此視為替代能源中最具潛 力能源之一，電解水產氫(water electrolysis)越來越具重要性，因為此 方法簡單乾淨、產生氫氣濃度高，雖然像鉑金屬之類的貴金屬在析氫 反應中具有高效能的催化活性，但其昂貴且含量少，故開發出便宜且 在地表含量豐富之新穎析氫觸媒為我們重要的課題。 本研究中，我們合成出3D奈米結構之二硫化鐵，因其結構具多孔 性且為立體結構可露出更多活化位置，並提高整體比表面積，藉此特 性可有效提升二硫化鐵在作為析氫觸媒上的表現。 3D奈米結構之二硫化鐵比起球型二硫化鐵奈米晶體與立方體二 硫化鐵奈米晶體具及立方體二硫化鐵奈米晶體與還原態氧化石墨烯 之混合物有更良好的析氫活性。在極化曲線量測中發現，立體結構之 onset potential 約 150 mV。 而其 Tafel slope 值約 58 mV/dec。但二 硫化鐵奈米晶體之穩定性仍然 不足,是未來研究重點之一。

Abstract Hydrogen is a clean energy. During the process of releasing energy, hydrogen produce no green-house-effect gas, such as CO2 or CH4. Hydrogen is serves as one of the most promising conditions for replacing petroleum fuels in the future. Water electrolysis has many advantages, such as high efficiency, high purity in producing hydrogen, easy in use, etc., and thus become one of popular methods. Although the rare metals, such as platinum, have high efficiency in the hydrogen evolution reaction (HER), their scarcity and high cost inhibit large scale applications. Thus, research on designing new, inexpensive, and abundant HER catalysts is important. In this work , we synthesis 3D nanostructure FeS2. The high surface curvature of this catalyst mesostructure exposes a large fraction of edge sites, which, along with its high surface area, leads to excellent activity for electrocatalytic hydrogen evolution. The 3D nanostructure FeS2 exhibited superior electrocatalytic activity in the hydrogen evolution reaction (HER) rather than the other FeS2 nanoparticles FeS2 nanocubic and FeS2 nanocubic/r-GO hybrid . The 3D nanostructure showed an overvoltage requirement only 150mV. A Tafel slope of ~58mV/decade was measured for 3D nanostructure FeS2 in the HER.