Novel Hybrid Energy Conversion and Storage Cell with Photovoltaic and Supercapacitor Effects in Ionic Liquid Electrolyte.

ABSTRACT: A single hybrid energy conversion and storage (HECS) cell of alpha-cobalt hydroxide (α-Co(OH)₂) in ionic liquid was fabricated and operated under light illumination. The α-Co(OH)₂, which is unstable in an aqueous electrolyte (i.e. KOH), is surprisingly stable in 1-butyl-1-methyl-pyrrolidinium dicyanamide ionic liquid. The as-fabricated HECS cell provides 100% coulombic efficiency and 99.99% capacity retention over 2000 cycles. Under a photo-charging condition, the dicyanamide anion of ionic liquid can react with a generated α-Co(OH)₂⁺ hole at the positive electrode since the HOMO energy level of the anion is close to the valence band of α-Co(OH)₂. The excited photoelectron will transfer to the current collector and move to the negative

SUBMITTER: Kalasina S 

PROVIDER: S-EPMC6093932 | biostudies-literature | 2018 Aug

REPOSITORIES: biostudies-literature