利用三維化學氣相沉積在碳纖維布上高效率生長碳奈米螺旋線並用於全碳超級電容

Effective Growth of Carbon Nanocoils by Three-Dimensional Chemical Vapor Deposition on Carbon Fiber Clothes for All-Carbon Supercapacitors

胡鑫(Hu, Shin)

指導教授 ： 裘性天 ； 李紫原

國立交通大學/理學院/應用化學系所/碩士(2018年)

摘要

於本研究中，我們藉由同時沉積金/鉀二元催化劑成功生長三維碳奈米螺旋線網絡於碳纖維布。此三維碳奈米螺旋線網絡順利地將其傑出的一維特性帶入到碳纖維布上。藉由將氯金酸還原得到金奈米粒子以及增加和鉀金屬蒸氣的接觸面積之系統性方法使得金與鉀能夠同時沉積。根據Randles-Sevcik equation描述，電化學活性表面積能 夠利用三電極系統下的循環伏安法而測得。CNC-based 電極 (16.53 cm2)比起原本的碳纖維(5.84 cm2)擁有接近三倍的電化學活性表面積。在電阻方面，由於碳奈米螺旋線能夠提供許多有效的路徑因此擁有最低的電阻。為了更加全面性的研究，在本研究中同時使用到在液態以及固態環境下的二電極系統進行測量。在循環伏安法的測量中，於不同的掃描速度下，電容皆呈現出接近長方形的圖譜，這表示其具有相當接近理想電容的表現。透過定電流充放電的測量後，液態和固態電容的電容值大小經過計算後約為137 F/g和134 F/g。此外CNC固態電容表現出相當優秀的能量密度(18.6 Wh/kg)以及功率密度(500 W/kg)。由於在電極的架構中使用到碳纖維布，因而此電極擁有相當好的彈性及可撓性。其相當輕薄(0.1965 g)且可被彎曲至180度，這意味著此電極在作為攜帶型電子裝置或是穿戴裝置的能量儲存系統之中是相當具有潛力的材料。

關鍵字

碳奈米螺旋線 ； 化學氣相沉積 ； 金催化劑 ； 鉀催化劑 ； 超級電容

並列摘要

On three-dimensional (3D) fabric synthesis, a bottom-up strategy for growth of 3D carbon nanocoils (CNCs) frameworks facilitated by Au/K binary catalysts via in-situ deposition. The generation of 3D CNCs networks effectively rendering the extraordinary 1D characteristics directly on carbon fiber clothes. A system of methodology offers a conduit to achieve in-situ catalysis deposition via Au nanoparticles from HAuCl4 reduction and the increase of contacting area with vapor K. By using a three-electrode system, the electrochemical active surface area was determined referring to Randles-Sevcik equation. The CNC-based electrode exhibited almost three times surface area (16.53 cm2) as large as original substrate owned (5.84 cm2). In terms of resistance, the relative minimums were observed because of CNCs provide multitudinous accessible routes for electrolyte transportation. To comprehensively investigate, both liquid- and solid-state sets were applied by using two-electrode system. Both devices exhibited nearly rectangular shape profiles in CV measurements at various scan rates, indicating ideal double-layer capacitive behavior. From Galvanostatic charge/discharge (GCD) curves, the specific capacitance of CNC-based supercapacitors (CNC-based SC) in liquid- and solid-state system were measured to be approximately 137 F/g and 134 F/g, respectively. In addition, the solid-state CNC-based SC possessed excellent energy density (18.6 Wh/kg) and power density (500 W/kg). A bendable carbon fiber clothes was introduced to serve as subtract, then a light (0.1965 g) and high flexibility supercapacitor could be realized. These suggested that the material will be an excellent candidate for energy storage systems in wearable devices and other applications.

並列關鍵字

carbon nanocoils ； chemical vapor deposition ； Au catalyst ； K catalyst ； supercapacitors

參考文獻

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