Lim TaeGyeong, Kim TaeYoung, Suk Ji Won
School of Mechanical Engineering, Sungkyunkwan University, Suwon 16419, Gyeonggi-do, Korea.
Department of Materials Science and Engineering, Gachon University, Seongnam 13120, Gyeonggi-do, Korea.
Nanomaterials (Basel). 2021 Mar 31;11(4):893. doi: 10.3390/nano11040893.
A porous Cu (P-Cu) mesh was used as a current collector and its morphological effect on the supercapacitor performance was investigated. A porous surface was obtained by thermally annealing the Cu mesh using ammonia gas. Hierarchically porous activated graphene (AG) with a high specific surface area (SSA) was deposited on the P-Cu mesh using electrophoretic deposition, aided by graphene oxide (GO). GO was thermally converted to electrically conductive reduced graphene oxide (rGO). The AG/rGO that was deposited on the P-Cu mesh achieved a high specific capacitance of up to 140.0 F/g and a high energy density of up to 3.11 Wh/kg at a current density of 2 A/g in 6 m KOH aqueous electrolyte. The high SSA of AG and the porous surface morphology of the Cu mesh allowed efficient electric double-layer formation and charge transport. This work offers an alternative to improve supercapacitors by combining a porous metallic current collector with porous AG.
采用多孔铜（P-Cu）网作为集流体，并研究了其形态对超级电容器性能的影响。通过使用氨气对铜网进行热退火处理获得多孔表面。借助氧化石墨烯（GO），采用电泳沉积法在P-Cu网上沉积具有高比表面积（SSA）的分级多孔活性石墨烯（AG）。GO经热转化为导电的还原氧化石墨烯（rGO）。在6 m KOH水溶液电解质中，以2 A/g的电流密度，沉积在P-Cu网上的AG/rGO实现了高达140.0 F/g的高比电容和高达3.11 Wh/kg的高能量密度。AG的高比表面积和铜网的多孔表面形态使得能够高效形成双电层并实现电荷传输。这项工作提供了一种通过将多孔金属集流体与多孔AG相结合来改进超级电容器的替代方法。
