Data for: Charge/Discharge and Cycling Performance of Flexible Carbon Paper Electrodes in a Regenerative Hydrogen/Vanadium Fuel Cell

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).

本研究针对再生式氢钒燃料电池（Regenerative Hydrogen/Vanadium Fuel Cell, RHVFC）展开探究，实验采用弗劳德堡（Freudenberg）碳纸电极（Carbon Papers, CPs）。除热处理外，研究还通过300 V电泳沉积法，使用还原氧化石墨烯（Reduced Graphene Oxide, rGO）对弗劳德堡碳纸电极进行改性。在相同运行工况下，经rGO改性的碳纸电极的功率密度较未处理样品提升25%。相较于首次预研工作，本文报道的功率密度提升了四倍以上。此外，先经热处理再将rGO改性层朝向膜侧的碳纸电极（rGOHTFM）表现出最优的电解液放电利用率（Electrolyte Discharge Utilization, UE），在50 mA cm⁻²的电流密度下可达99%；未处理样品次之（UE=98%），热处理样品最差（UE=97%）。该rGOHTFM电极在相同电流密度下的充放电能量效率（Energy Efficiency, ηE）可达93%，略高于未处理碳纸电极（ηE=91%）。对系统进行10次循环测试后，rGOHTFM碳纸电极的充放电能量效率和电解液放电利用率依旧优于未处理电极：前者平均ηE为92%、平均UE为99%，后者平均ηE仅为86%、平均UE为97%。如预期一致，当前被广泛研究的SGL 10AA型碳纸电极的效率与利用率更低，其平均ηE为74%、平均UE为83%。