Charge/discharge and cycling performance of flexible carbon paper electrodes in a regenerative hydrogen/vanadium fuel cell
| Autor: | Vladimir Yufit, Nigel P. Brandon, Graham Stevenson, Jingyu Feng, Ashkan Kavei, Maria-Magdalena Titirici, Barun Kumar Chakrabarti, Yuhua Xia, Hui Luo, Farid Tariq, Oluwadamilola O. Taiwo, Evangelos Kalamaras |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
Materials science
Hydrogen Renewable Energy Sustainability and the Environment Analytical chemistry Oxide Energy Engineering and Power Technology Vanadium chemistry.chemical_element 02 engineering and technology Thermal treatment Electrolyte 010402 general chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences 0104 chemical sciences Electrophoretic deposition chemistry.chemical_compound Fuel Technology chemistry Electrode 0210 nano-technology Power density |
| Zdroj: | International Journal of Hydrogen Energy. 44:30093-30107 |
| ISSN: | 0360-3199 |
| Popis: | The regenerative hydrogen/vanadium fuel cell (RHVFC) is investigated with Freudenberg carbon paper electrodes (CPs). Along with thermal treatment, the Freudenberg CPs are also treated with reduced graphene oxide (rGO) using electrophoretic deposition at 300 V. The rGO modified CP results in 25% higher power density than its untreated counterpart under the same operating conditions. In comparison to the first preliminary study, the power density reported herein is more than four times higher. Additionally, the Freudenberg CPs modified with heat treatment followed by rGO deposition facing the membrane (rGOHTFM) provide the best electrolyte discharge utilization (UE) of 99%, followed by untreated (98%) and heat treated samples (97%) at 50 mA cm−2. The rGOHTFM also record high charge and discharge energy efficiencies (ηE) of 93% at the same current density, which is slightly higher than untreated CPs (ηE = 91%). Cycling the system 10 times also results in higher ηE and UE for rGOHTFM CP (ηE = 92% and UE = 99% on average) in comparison to untreated electrodes (ηE = 86% and UE = 97% on average). In comparison the widely investigated SGL 10AA CP has lower efficiencies and utilization as expected (ηE = 74% and UE = 83% on average). |
| Databáze: | OpenAIRE |
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