Comment on "Flexible Asymmetric Supercapacitors Based on Nitrogen‐Doped Graphene Hydrogels with Embedded Nickel Hydroxide Nanoplates". Issue 10 (10th May 2017)

• Record Type: Journal Article
• Authors: Vongehr, Sascha
• Is Part Of: ChemSusChem. Volume 10:Issue 10(2017)
• Page Start: 2309
• Page End: 2311
• Publication Date: 2017-05-10
• Subjects: calculations -- graphene -- microporous materials -- nickel -- supercapacitors; Green chemistry -- Periodicals; Sustainable engineering -- Periodicals; Chemistry -- Periodicals; Chemical engineering -- Periodicals; 660
• DOI: 10.1002/cssc.201700330
• Languages: English
• ISSNs: 1864-5631

Abstract

Abstract : It is argued that the main claims of "Flexible Asymmetric Supercapacitors Based on Nitrogen‐Doped Graphene Hydrogels with Embedded Nickel Hydroxide Nanoplates" are strongly exaggerated. By selecting first a subregion (Δ V ) of the total voltage drop, the capacitance ( C Δ V ) is inflated by 30 %. Then, by selecting different regions for different properties and using different Δ V values in different terms of a single expression for the energy density ( E Δ V ), the value is doubled. A bending angle of only 45° is instead claimed to be 180°.