Journal
ACS APPLIED ENERGY MATERIALS
Volume 5, Issue 6, Pages 6805-6813Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsaem.2c00417
Keywords
magnesium hydroxide; catalyst; CVD; mesoporous carbon; supercapacitor
Funding
- Robert A. Welch Foundation [AT1153]
- University of Texas at Dallas Office of Research [10319]
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Hierarchical porous carbon nanosheets were fabricated using a one-step CVD approach on Mg(OH)2 substrates, exhibiting high surface areas and excellent electrochemical performance, with notable stability.
Hierarchical porous carbon nanosheet (HPCN) materials of different thicknesses were fabricated on Mg(OH)2 substrates utilizing a one-step chemical vapor deposition (CVD) approach. The templated carbon nanosheets are closely packed hierarchical nanostructures possessing high surface areas varying from 1323 to 1978 m2middotg-1. Symmetrical electrochemical doublelayer capacitors (EDLCs) were constructed using the HPCN and demonstrated a high specific capacitance of 205 Fmiddotg-1 at 5 mV/s using 1-ethyl-3-methylimidazolium bis (trifluoromethylsulfonyl)imide (EMIM-TFSI) as an electrolyte. The energy density was 86 Whmiddotkg-1, and a power density of up to 16.57 kWmiddotkg-1 was observed. After 5000 charge-discharge cycles at 10 Amiddotg-1, the supercapacitor retained 90% of its initial capacity. This illustrates the great stability of the templated mesoporous carbon sheets for supercapacitors.
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