Defect-Engineered Graphene for High-Energy- and High-Power-Density Supercapacitor Devices.

Zhu, Jingyi; Childress, Anthony S; Karakaya, Mehmet; Dandeliya, Sushmita; Srivastava, Anurag; Lin, Ye; Rao, Apparao M; Podila, Ramakrishna · Adv Mater · 2016

basic_science · Level V

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Abstract

Defects are often written off as performance limiters. Contrary to this notion, it is shown that controlling the defect configuration in graphene is critical to overcome a fundamental limitation posed by quantum capacitance and opens new channels for ion diffusion. Defect-engineered graphene flexible pouch capacitors with energy densities of 500% higher than the state-of-the-art supercapacitors are demonstrated.