A recent paper by Jiang et al. [1] provides a modifying of counter electrode (CE) with a poly (vinylidene fluoride) (PVDF) composite could be generated both energy conversion and storage. As the results, the generation of energy storage is due to the high dielectric constant of PVDF layer. Herein, we pointed out the energy storage can be formed with electrolyte consisted of Li+ ions and without using PVDF layer. This study also discusses the formation of energy storage at the CE. The finding in this work may pay the way for further development of an efficient CE for the large-scale applications of dye-sensitized solar cells (DSCs) in the future, and energy storage of DSCs. (C) 2016 Elsevier B.V. All rights reserved.