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，实验采用科德宝（Freudenberg）碳纸电极（carbon paper electrodes, CPs）。除热处理工艺外，研究团队还通过300 V电泳沉积法，对碳纸电极施加还原氧化石墨烯（reduced graphene oxide, rGO）改性处理。实验结果显示，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对照组提升25%。与本研究前期的初步探索相比，本次报道的功率密度提升幅度超过四倍。在50 mA cm⁻²的电流密度下，经热处理后将rGO改性层朝向质子交换膜的碳纸电极（rGOHTFM）的电解液放电利用率（UE）最高，可达99%；其次为未处理碳纸电极（98%），仅经热处理的碳纸电极则为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%）。经过10次循环测试后，rGOHTFM碳纸电极的平均充放电能量效率和电解液放电利用率分别为92%和99%，整体性能优于未处理电极（平均ηE=86%、UE=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均偏低，其平均充放电能量效率为74%，平均电解液放电利用率为83%。