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).

本研究针对再生氢钒燃料电池（RHVFC）展开实验探究，采用弗劳德堡碳纸电极（CPs）作为电极材料。除热处理工艺外，研究团队还通过300 V电泳沉积法，对弗劳德堡碳纸电极进行还原氧化石墨烯（rGO）改性处理。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%。与首次前期研究成果相比，本研究报道的功率密度提升四倍以上。经热处理后再将rGO沉积层朝向膜侧的弗劳德堡碳纸电极（rGOHTFM），在50 mA·cm⁻²的电流密度下，展现出最高的电解液放电利用率（UE），达99%；其余样品依次为未处理电极（98%）与仅经热处理的电极（97%）。该rGOHTFM电极在相同电流密度下的充放电能量效率（ηE）同样可达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碳纸电极的平均充放电能量效率（ηE=92%）与平均电解液放电利用率（UE=99%）仍优于未处理电极（平均ηE=86%，平均UE=97%）。相比之下，广泛研究的SGL 10AA型碳纸电极的效率与利用率则如预期般更低，平均ηE为74%，平均UE为83%。