Pt修飾之Mn0.5Cd0.5S應用於光催化水分解產氫之研究

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研究生：	鄭嘉恩 Tee, Jia-En
論文名稱：	Pt修飾之Mn0.5Cd0.5S應用於光催化水分解產氫之研究 Enhancing Photocatalytic Hydrogen Production with Pt-decorated Mn0.5Cd0.5S Nanoparticles in Water Splitting
指導教授：	陳力俊 Chen, Lih-Juann
口試委員:	呂明諺 Lu, Ming-Yen 吳文偉 Wu, Wen-Wei
學位類別：	碩士 Master
系所名稱：	工學院 - 材料科學工程學系 Materials Science and Engineering
論文出版年：	2024
畢業學年度：	112
語文別：	英文
論文頁數：	75
中文關鍵詞：	光催化水解產氫、Pt修飾之Mn0.5Cd0.5S 、共觸媒
外文關鍵詞：	Pt-decorated Mn0.5Cd0.5S
相關次數：	點閱：41 下載：0
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半導體因其在氫氣生產中的角色而受到關注。已知硫化鎘（CdS）在光催化產氫方面表現出色，但其面臨嚴重的光腐蝕問題，導致整體性能下降。為了克服這一問題，我們引入了錳（Mn）元素到CdS中，形成了一種過渡金屬取代的固溶體，即Mn0.5Cd0.5S。結果顯示，加入錳原子後明顯提高了光催化性能。

本研究中，我們使用水熱法合成了Mn0.5Cd0.5S奈米粒子。隨後，我們採用化學還原法將貴金屬白金（Pt）修飾到Mn0.5Cd0.5S材料表面，旨在提高其光催化性能。從結果來看，添加白金後顯著提高了氫氣生產效率。這一提升主要歸因於半導體與金屬之間形成的Schottky barrier，有助於有效的電荷分離和轉移。總體而言，Mn0.5Cd0.5S材料搭載3 wt.% Pt擁有最好的氫氣表現。

Semiconductors have gained attention for their role in hydrogen production. While CdS is renowned for its efficient hydrogen generation, it suffers from severe photocorrosion, which compromises its overall performance. To overcome this problem, we introduced Mn elements into this material. Our Mn0.5Cd0.5S nanoparticles were prepared via a hydrothermal method, resulting in a transition-metal-substituted solid solution known as Mn0.5Cd0.5S. The introduction of Mn atoms into CdS notably augmented the photocatalytic efficiency.

In the present study, we synthesized Mn0.5Cd0.5S nanoparticles to facilitate photocatalytic hydrogen production through water splitting. Subsequently, our focus shifted towards enhancing the photocatalytic performance by incorporating noble metal platinum onto Mn0.5Cd0.5S through a chemical reduction method. The results demonstrate a significant increase in the rate of hydrogen production upon the addition of Pt. This enhancement can be attributed to the formation of a Schottky barrier at the interface between the semiconductor and the metal, which facilitated efficient charge separation and transfer. Overall, Mn0.5Cd0.5S decorated with 3 wt.% Pt exhibited the highest yield in hydrogen production.

Abstract    i
摘要    ii
致謝    iii
Chapter 1 Introduction    1
1    Research Background    1
1.1    Energy Crisis    1
1.2    Photocatalytic Hydrogen Production by Water Splitting    3
2    Nanomaterials    5
2.1    Overview    5
2.2    Categories of Nanomaterials    7
2.3    Solid Solution    9
2.4    Transition Metal Sulfide    11
2.5    Hydrothermal method    13
3    Cocatalyst    16
3.1    Overview    16
3.2    Chemical Reduction Method    18
4    Material Selection    20
4.1    Mn0.5Cd0.5S Solid Solution    20
4.2    Cocatalyst Platinum (Pt)    22
4.3    Energy Diagram of Pt-decorated Mn0.5Cd0.5S Nanoparticles    24
5    Motivation    25
Chapter 2 Experimental Section    27
1    Experimental Equipments and Instruments    27
1.1    X-ray Diffraction (XRD) Instrument    27
1.2    Scanning Electron Microscope (SEM)    29
1.3    Transmission Electron Microscope (TEM)    31
1.4    UV-Visible Spectroscope (UV-Vis)    33
1.5    Photoluminescence (PL) Spectroscope    35
1.6    Gas Chromatograph (GC)    36
1.7    X-ray Photoelectron Spectroscope (XPS)    38
2    Experimental Procedures    39
2.1    Synthesis of Mn0.5Cd0.5S Nanoparticles    39
2.2    Synthesis of Pt-decorated Mn0.5Cd0.5S Nanoparticles    40
2.3    Hydrogen Production Efficiency Measurement    41
Chapter 3 Results and Discussion    42
1    Characteristics of Mn0.5Cd0.5S Nanoparticles    42
1.1    SEM Analysis    42
1.2    SEM/EDS Analysis    43
1.3    XRD Analysis    45
1.4    UV-Vis Absorbance Spectrum    47
1.5    TEM Analysis    48
2    Characteristics of Pt-Decorated Mn0.5Cd0.5S Nanoparticles    50
2.1    TEM Analysis    50
2.2    PL Analysis    52
2.3    XPS Analysis    54
3    Hydrogen Production Measurement    56
3.1    Effects of ratio of Mn:Cd in MnxCd1-xS    56
3.2    Effects of Different Pt Weight Percentages    57
3.3    Durability Test    59
3.4    Stability Test    61
3.5    STH Calculation    62
3.6    Applications    63
Chapter 4 Summary and Conclusions    64
Chapter 5 Future Prospects    65
1    Enhancing Photocatalytic Hydrogen Production Using Mn0.5Cd0.5S /g-C₃N₄-based Z-Scheme Systems    65
2    Enhancing Photocatalytic Hydrogen Production Using Mn0.5Cd0.5S with Dual Cocatalysts of Pt and Plasmonic Metals    67
References    69

                                

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