High-Performance Asymmetric Flow-Electrode Capacitive Mixing with MnO2-CoatedActivated Carbon Flow-Electrode for Energy Harvesting from Salinity Gradient Power
- Authors
- Hwang, Insung; Lee, Dongsoo; Jung, Yongmin; Kim, Jaeik; Kim, Jiwoon; Kim, Chanho; Kim, Donghyun; Yang, SeungCheol; Song, Taeseup; Paik, Ungyu
- Issue Date
- Apr-2022
- Publisher
- AMER CHEMICAL SOC
- Citation
- ACS MATERIALS LETTERS, v.4, no.4, pp.618 - 625
- Journal Title
- ACS MATERIALS LETTERS
- Volume
- 4
- Number
- 4
- Start Page
- 618
- End Page
- 625
- URI
- https://scholarworks.bwise.kr/gachon/handle/2020.sw.gachon/89275
- DOI
- 10.1021/acsmaterialslett.2c00154
- ISSN
- 2639-4979
- Abstract
- Flow-electrode capacitive mixing (F-CapMix) is apromising energy harvesting system, utilizing the salinitygradient difference between seawater and river water. However,the conventional F-CapMix system has a low power density dueto the limited charge storage of porous carbon materialsthrough the electrical double layer. In this study, wefirst reportmanganese dioxide-coated activated carbon (MO@AC) as aflow-electrode material for the F-CapMix system. MnO2nanoparticles could be easily decorated on the surface ofactivated carbon (AC) by the reduction of KMnO4in an acidicmedium. We systematically study electrochemical properties of AC and MO@AC-basedflow-electrodes as positive andnegative electrodes for both symmetric and asymmetric F-CapMix systems. The asymmetric F-CapMix system employing theMO@ACflow-electrode exhibits an outstanding power density of 2.22 W/m2through the reversible redox reaction with Na+ions. Our strategies can be extended to other materials that have redox reactions with Na+and Cl-ions for the F-CapMixsystem.
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