| 摘要: | 能源消耗的成長使我們對於乾淨且可再生能源的需求日益增加，而可以通過電催化產生的氫氣因其高能量密度和乾淨程度而被認為是十分理想的能量選擇。但於此同時，若是將珍貴的淡水資源用於能源用於分解生產氫氣燃料，將同時面對能源與水資源缺乏問題，消耗原本就以稀缺的淡水資源。是故，以地表存量甚鉅的海水用於分解，將會是一個值得發展的研究方向。本提案結合由本實驗室研發的獨步技術—雷射製程生產高熵奈米陶瓷粒子並將其披覆的電極材料與後續電催化析氫產氧以及檢驗技術分析。成功開發能在類海水環境下高效且穩定工作的高熵電極材料，並在未來直接使用於真實海水中運作。在此我們證實了高熵陶瓷奈米粒子(CoCrFeNiAlMn)O系統用於電極改質是適用於類海水環境的優良電極材料，根據循環伏安法(CV)測試啟動電壓為1.467V、也於恆流充電穩定性測試中以100(mA/cm2)電流輸出下成功運行1000小時、400(mA/cm2)大電流通電下運行超過250小時，可見具有良好的催化效果與穩定性、耐用性，具備可直接於市場環境條下一般工業的使用標準。此外，本提案透過同步輻射中心的臨場量測技術和理論模擬計算的結果闡明了各元素在析氧反應OER中各自的貢獻，其中Co、Mn、Ni三元素為OER中的活性位點且具備不同的反應機制，而Al、Cr、Fe三元素在OER過程中起到了穩定材料結構，防止高熵陶瓷在反應過程中因氯氣、氯酸侵蝕以及Mg、Ca金屬鹽類析出帶來的損害。綜上，本提案對於電催化反應相關領域的結合符合如今綠色產業發展與循環經濟的要點，除了在類海水環境下電催化反應相關領域將帶來極大的貢獻外，雷射製程也進一步提升高熵材料於不同領域之使用層面。;In the past ten years, due to the environmental protection and the development of circular economy industries, the research on green energy has become an increasingly important subject and challenge. In the United Nations climate conference COP26, which will end at the end of 2021, many countries responded to the goal of net zero carbon emissions by 2050. Among them, the utilization and development of renewable energy such as hydrogen energy can be said to be imperative; but according to this experiment According to the data found by the team, the current hydrogen energy industry still uses water vapor and low-carbon petrochemical raw materials as raw materials for steam reforming (Steam methane reforming, SMR). For this reason, the green hydrogen method that has emerged in recent years to produce hydrogen fuel may be another feasible solution direction. However, in the face of the world′s current breakthrough of 7.8 billion and an increasing population, the already scarce fresh water resources will inevitably be unable to be used to produce hydrogen energy. Compared with the global water resources as a whole, the freshwater resources that we can use effectively and conveniently are less than 1%. Under these preconditions, green hydrogen production using electrolyzed seawater as a raw material is a promising technology.The research on high-entropy materials has entered the second decade since Professor Jien-Wei Yeh published the design concept of high-entropy alloys in 2004. In addition to the initial alloy project, related research has expanded to ceramics. Oxides (high-entropy ceramics), high-entropy thin films, high-entropy superalloys, high-entropy steels, high-entropy polymers and other fields of material research. In addition to the changes in the general direction, the related process and application development are even more innovative. The laboratory team has developed a series of brand-new unique processes based on previous researches, which are named as vacuum metal salt lasers. Processing Technology.In this study, a CoCrFeNiAlMn mixture solution composed of nitrate metal salts was prepared by pulsed fiber laser irradiation as a precursor drug. The product was high-entropy nano-ceramic particles coated on various substrates using as a catalytic electrode. The combination of experimental parameters controlled during the manufacturing process is the type of precursor metal salt, the laser repeated scanning power and the number of round trips, and the type of substrate, and the finished product is subjected to a series of analyses such as electron microscope microstructure and X-ray diffraction analysis. The elemental composition and crystal structure analysis of the instrument and X-ray photoelectron spectrometer were used to repeatedly verify the material properties and trends of the high-entropy ceramic nanoparticle film.The XRD analysis of synchrotron radiation proves that this material is a high-entropy ceramic nanoparticle with a spinel structure. Elemental occupancy, so this process can fill the spinel with divalent or trivalent metals, which will affect the traditional structural impression of the catalysis of high-entropy ceramic nanoparticles.Using its process technology to fabricate electrocatalytic electrodes, react nitrate CoCrFeNiAlMn precursor on indium tin oxide plated glass substrate, foamed nickel metal substrate, carbon fiber, carbon fiber paper substrate, in a simulated seawater-like environment electrolyte and The OER oxygen evolution reaction in real seawater can obtain excellent current density output and greatly reduce the reaction overpotential response compared with the untreated mother substrate, and obtain a service life of more than 1000 hours in the stability measurement. In addition to improve electrocatalytic activity and stability, 400 mA/cm2 is the standard current requirement for industrial applications, and our CoCrFeNiAlMn HEC can operate at such a high current density for over 250 hours without significant decay. |
