時至今日,探索如何創(chuàng)新地設計和簡單地制備出同時具有氧還原反應(ORR)和析氧反應(OER)特性的雙功能、低花費的電催化劑,對于諸如燃料電池和金屬空氣電池等進行可循環(huán)能源儲存和轉移的技術來講,已成為重中之重。在此論文的第一部分中,我通過一種簡單且直接的生長方式,即固相焙燒ZIF-67和尿酸,構建出了一種以氮元素摻雜的碳納米管中包覆金屬Co單質的異質結構(Co-NCNTs)。在此,尿酸(UA)被視為碳納米管的引發(fā)劑:它能夠在較低溫度下(440℃)發(fā)生熱分解,進而產生易于通過滲透作用進入ZIF-67多面體中的碳質氣氛。該碳質氣氛能夠為同時原位產生的Co金屬納米粒子提供在升溫過程中催化生長N-CNTs的氣源。由于納米催化劑是在表面優(yōu)先生成的,因此CNTs在隨后的生長過程中將會在ZIF-67多面體上由內向外定向生長,直至形成類球狀的納米管簇。此外,尿酸也作為催化劑中石墨結構的誘導劑。最終得到的催化劑,具有典型的蠕蟲狀CNTs結構,同時也具有以下一些獨特的優(yōu)點:(1)由于一維的CNTs具有典型的石墨結構,因此將會提升催化劑的導電性;(2)Co-NCNTs-700由于具有最大的比表面積和明顯的介孔紋...

【文章頁數(shù)】：109 頁

【學位級別】：碩士

【文章目錄】：
學位論文數(shù)據(jù)集
Abstract
摘要
Abbreviations
Chapter 1: Introduction and Literature Review
    1.1 Introduction
        1.1.1 Problems related fossil energies
        1.1.2 Key Role of ORR and OER in clean energy conversion and storage devices
        1.1.3 Aims and Objectives
    1.2 Literature review
        1.2.1 Metal-air batteries and fuel cells
        1.2.2 Supercapacitor
        1.2.3 Oxygen electrolysis in Zn-air battery
    1.3 Role of Metal organic frame work (MOFs) in the oxygen reduction and oxygen evolutionreactions
    1.4 Mechanism of oxygen reduction reaction
    1.5 Mechanism of oxygen evolution reaction
Chapter 2: Materials and methods
    2.1 Materials
        2.1.1 Chemical reagents
        2.1.2 Materials characterization
        2.1.3 Pyrolysis of solid precursors
        2.1.4 Preparation of ZIF-67 particles
        2.1.5 Synthesis of Co-NCNTs-700
        2.1.6 Preparation Co-NCNPs-700
        2.1.7 Preparation of ZIF-UA-440
        2.1.8 Electrode pre-treatment and preparation of catalyst ink
        2.1.9 Preparation of catalyst layer
        2.1.10 Preparation of gas diffusion layer
    2.2 Synthesis of DSNCs-700
        2.2.1 Synthesis of ZIF-67-700
        2.2.2 Synthesis of ZIF-67-UA-400
        2.2.3 Acid washing
        2.2.4 Catalyst ink
        2.2.5 Preparation of Catalyst layer for supercapacitor
    2.3 Electrochemical tests
        2.3.1 Cyclic voltammetry (CV)
        2.3.2 Rotating ring disk electrode (RRDE) analysis and Tafel slope
        2.3.3 Potential Gap (ΔE)
Chapter 3: In-situ growth of N-CNTs on MOF derived carbon materials as highlyefficient electro catalyst for Oxygen reduction and revolution reaction
    3.1 introductions
    3.2 Results and Discussio
        3.2.1 Structure morphology and the effect of heating temperature on N-CNTs
        3.2.2 XRD and RS study of Co-NCNTs-700 and Co-NCNPs-700
        3.2.3 Surface functionalities and surface area Analysis
        3.2.4 TGA, MS and FT-IR analysis of UA
    3.3 The oxygen reduction- evolution reaction activities and ZAB performance of the asprepared materials
        3.3.1 The Oxygen reduction-evolution reaction activities
        3.3.2 ZAB performance
Chapter 4: MOFs derived hybrid double shell Nanocages carbon materials forefficientOxygen reduction reaction (ORR) and supercapacitor
    4.1 Introduction
    4.2 Results and discussions
        4.2.1 SEM and TEM analysis
        4.2.2 XPS and BET analysis
        4.2.3 XRD and RS analysis
    4.3 ORR activity and Supercapacitor performance
        4.3.1 ORR activity
        4.3.2 Supercapacitor performance
Chapter 5: Conclusion
References
Acknowledgement
Author's Introduction
Advisor's Introduction
附件



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