臺灣博碩士論文加值系統

鋅空氣電池是儲能研究上很重要的研究領域之一，發展重點主要著重在具有高效能的氧還原反應（ORR）和析氧反應（OER）的觸媒，使其電池擁有充電及放電的功能。本研究主要以簡易、低成本的方式利用MOF材料（ZIF-67和ZIF-8）所衍生（derived）製作出奈米碳管分佈在表面的孔碳四氧化三鈷觸媒。由於氮摻雜碳及奈米四氧化三鈷具有優異的ORR及OER效果，加上奈米碳管提供此觸媒材料具有高導電性，多孔碳材母體（matrix）提供高效率的質傳性能，使得Zn-air電池有良好的表現，在ORR表現上此觸媒的半波電位為-0.124 V（Pt/C:-0.152 V於0.1M KOH），極限電流密度為4.84 mA/cm2（Pt/C: 4.9 mA/cm2），在OER表現上，於電流密度為10 mA/cm2時電壓為0.819 V（Ir/C:0.771 V），在鋅空氣電池的表現上，此觸媒的比電容為814 mAh/g（1.19 V at 50 mA/cm2）非常接近理論電容（820 mAh/g），展現最大功率密度為267 mW/cm2（0.746 V at 385 mA/cm2）; Pt/C則為255 mW/cm2（0.711 V at 360 mA/cm2），在充放電測試中，於電流密度為50 mA/cm2時，其充放電壓力差僅為0.7 V，低於Pt/C觸媒的0.84 V。由於Co3O4/NC催化劑優異性能及簡易的製備方法和低成本的優點，可有效利用做為鋅空氣電池的陰極材料。

Zinc air battery (ZAB) is one of the most important research fields in energy storage application. The study of ZAB mainly development focuses on the catalysts with high efficient oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) so that the battery is capable of conducting with charging and discharging processes. In this study, carbon-nanotube (CNT) -grafted and Co3O4-doped porous carbon was prepared by the carbonization of the synthesized zeolitic imidazolate framework (ZIF-67/ZIF-8) compound followed by an oxidation treatment. The novel catalyst demonstrated excellent ORR and OER because of the Co3O4 nanoparticles and nitrogen-doped in the carbon framwork (NC). In addition, the carbon nanotube grafted on the framework provided a good electrical conductivity while the carbon framework matrix provided a porous skeleton which is beneficial for the mass transfer of electrolyte. In the ORR study, the novel catalyst, CNT-Co3O4/NC, showed a half-wave potential of -0.124 V at 0.1 M KOH (Pt/carbon: -0.152 V) while the limited current density is 4.84 mA/cm2 (Pt/ carbon: 4.9 mA/cm2). In terms of OER performance, the potential is 0.819 V at current density of 10 mA/cm2 (Ir/carbon: 0.771 V). In the ZAB study, with CNT-Co3O4/NC catalyst, a specific capacitance of 814 mAh/g (1.19 V at 50 mA/cm2) was obtained, which is very close to the theoretical capacitance (820 mAh/g) and maximum power density was 267 mW/cm2 (0.746 V at 385 mA/cm2) while 255 mW/cm2 (0.711 V at 360 mA/cm2) was obtained using Pt/carbon catalyst. We believe that the novel CNT-Co3O4/NC can be used as an excellent catalyst in the zinc-air battery.

中文摘要 I
Abstract II
目錄 III
第一章、緒論 1
第二章、實驗方法 4
第三章、結果與討論 8
第四章、結論 32
參考文獻 33
附錄 42

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