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Controllable synthesis of large-area free-standing amorphous carbon films and their potential application in supercapacitors

机译：大面积自支撑无定形碳膜的可控合成及其在超级电容器中的潜在应用

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A new and simple approach is proposed for the first time to fabricate free-standing amorphous carbon films (FS-ACFs) with controllable thickness by ambient pressure chemical vapor deposition (APCVD). The approach uses methane as the carbon source and Ni foil as the catalytic substrate, in which a large number of carbon atoms are trapped by controlling the experimental conditions during the APCVD growth process, and FS-ACFs are obtained by a simple corrosion of the Ni foil after APCVD growth. FS-ACFs having a uniform and continuous morphology with variable sizes over one hundred square centimeters and a controllable thickness of tens to hundreds of nanometers are synthesized by controlling the experimental conditions. Microstructure observations show that FS-ACFs have porous and transparent characteristics, which can be transferred or bent on different substrates, thus allowing for a variety of potential applications in electrochemistry. As a proof of concept, an electrochemical supercapacitor device directly assembled by using the FS-ACF exhibits an ultrashort time constant of 46 ms, a wide frequency range (similar to kHz) for capacitive feature, and a good capacitance performance with an area specific capacitance of 0.28 mF cm(-2) at a scan rate of 50 mV s(-1). Furthermore, the FS-ACF-based supercapacitor shows a high power density with a maximum volumetric power density of 17.76 W cm(-3).
机译：首次提出了一种新的简单方法，通过环境压力化学气相沉积（APCVD）来制造厚度可控的自立无定形碳膜（FS-ACF）。该方法使用甲烷作为碳源，并使用镍箔作为催化基质，其中通过控制APCVD生长过程中的实验条件来捕获大量碳原子，并且通过简单腐蚀镍获得FS-ACF。 APCVD生长后的金属箔。通过控制实验条件，合成了具有均匀且连续的形态，尺寸可变的超过100平方厘米，可控制的厚度为数十到数百纳米的FS-ACF。微观结构观察表明，FS-ACF具有多孔和透明的特性，可以在不同的基材上转移或弯曲，从而在电化学中具有多种潜在应用。作为概念验证，使用FS-ACF直接组装的电化学超级电容器装置具有46 ms的超短时间常数，宽容性的频率范围（类似于kHz）和良好的电容性能（具有比面积电容）扫描速度为50 mV s（-1）时，可得到0.28 mF cm（-2）的光。此外，基于FS-ACF的超级电容器显示出高功率密度，最大体积功率密度为17.76 W cm（-3）。

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