Abstract
This study reports an investigation of hydroquinone (HQ) as a multielectron organic redox molecule to enhance the performance of flowable electrodes. Two different methods to produce high-performance pseudocapacitive flowable electrodes were investigated for electrochemical flow capacitors. First, HQ molecules were deposited on carbon spheres (CSs) by a self-assembly approach using various HQ loadings. In the second approach, HQ was used as a redox-mediating agent in the electrolyte. Flowable electrodes composed of HQ showed a capacitance of 342 F g-1, which is >200 % higher than that of flowable electrodes based on nontreated CSs (160 F g-1), and outperformed (in gravimetric performance) many reported film electrodes. A similar trend in capacitance was observed if HQ was used as a redox agent in the electrolyte; however, its poor cycle life restricted further consideration. In addition, a twofold increase in capacitance was observed under flow conditions compared to that of previous studies.
Original language | English (US) |
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Pages (from-to) | 835-843 |
Number of pages | 9 |
Journal | ChemSusChem |
Volume | 8 |
Issue number | 5 |
DOIs | |
State | Published - Mar 2015 |
Externally published | Yes |
All Science Journal Classification (ASJC) codes
- Environmental Chemistry
- Chemical Engineering(all)
- Materials Science(all)
- Energy(all)
Keywords
- carbon
- electrochemistry
- energy transfer
- redox chemistry
- surface analysis