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Waste Disposal & Sustainable Energy
Waste Disposal & Sustainable Energy  2021, Vol. 3 Issue (1): 31-39    DOI: 10.1007/s42768-020-00068-3
    
废油制备垂直取向石墨烯及超级电容应用
Cost-effective, environmentally-sustainable and scale-up synthesis of vertically oriented graphenes from waste oil and its supercapacitor applications
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摘要： 垂直取向石墨烯（VGs）在各类储能应用中引起了极大的关注。然而，VGs高昂的制备成本严重阻碍了其实际应用。本文报道了一种具有较高经济性、环境可持续性以及可拓展性的氩等离子体增强化学气相沉积工艺，成功将废油转化为高质量VGs。通过引入氩气，提高了等离子体中电子能量和电离率，进而将废油中化学键裂解以获得高活性物系，随后刻蚀出无定形碳。单次制备的VGs面积可达12?×?3.5 cm2，具有高度取向性结构以及优于基于碳氢化合物前驱物制备的VGs的生长效率。在超级电容储能应用中，VGs电极表现出显著增强的比电容（约为碳氢化合物前驱物制备的VGs的4倍）和优异的交流滤波能力（120 Hz下的阻容时间常数为163 μs），综合性能相较于无取向石墨烯电极具有显著提升。此外，制备的MnO2/VGs复合电极在功率密度为1.0 kW/kg时的能量密度最大可达33.2 Wh/kg，在能量密度为22.9 Wh/kg时的功率密度为10.2 kW/kg。经济性分析表明，采用该方法的VGs生产成本可降低32%左右。本工作为VGs先进储能应用开辟了一条低成本、环境友好的材料制备路径。
Abstract: Vertically oriented graphenes (VGs) have attracted tremendous attention in a variety of energy storage-related applications. However, the high cost of preparing VGs significantly hinders their practical applications. Herein we introduce the Ar-plasma-enhanced chemical vapor deposition to demonstrate the cost-effective, environmentally-sustainable, and scale-up synthesis of VGs from waste oil. In our system, Ar gas can improve the electron energy and ionization rate of plasma, which breaks down the chemical bonding of waste oil into essential species to etch the amorphous carbon, yielding large-area VGs (12?×?3.5?cm2) with highly-oriented structure and superior growth efficiency beyond VGs from hydrocarbon precursors. In the supercapacitor applications, the VG-based electrode exhibits significantly enhanced capacitance (~4 times that from conventional hydrocarbon gases) and efficient AC (alternating current) filtering capability RC (resistor-capacitor) (time constant of of 163?μs at 120?Hz), which is obviously superior to the non-oriented counterpart. Besides, MnO2/VGs composite electrode is prepared to deliver a maximum energy density of ~33.2?Wh/kg at 1.0?kW/kg and a power density of 10.2?kW/kg at 22.9?Wh/kg. In the end, the economic analysis suggests that the total cost of VGs can be reduced by ~32%. This work provides an environment-friendly and low-cost avenue for preparing VGs for advanced energy storage applications.
出版日期: 2021-06-27
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Wenhao Kuang
Huachao Yang
Chongyan Ying
Biyao Gong
Jing Kong
Xiangnan Cheng & Zheng Bo

引用本文:

Wenhao Kuang, Huachao Yang, Chongyan Ying, Biyao Gong, Jing Kong, Xiangnan Cheng & Zheng Bo. Cost-effective, environmentally-sustainable and scale-up synthesis of vertically oriented graphenes from waste oil and its supercapacitor applications. Waste Disposal & Sustainable Energy, 2021, 3(1): 31-39.

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https://www.zjujournals.com/wdse/CN/10.1007/s42768-020-00068-3    或    https://www.zjujournals.com/wdse/CN/Y2021/V3/I1/31

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