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Reported data in this paper are about Nafion 112 membrane standard tests and MEA activation tests of PEM fuel cell in various operation condition. Dataset include two general electrochemical analysis method, Polarization and Impedance curves. In this dataset, effect of different pressure of H2/O2 gas, different voltages and various humidity conditions in several steps are considered. Details of experimental methods has been explained in this paper. Behavior of PEM fuel cell during distinct operation condition tests, activation procedure and different operation condition before and after activation analysis can be concluded from data. In Polarization curves, voltage and power density change as a function of flows of H2/O2 and relative humidity. Resistance of the used equivalent circuit of fuel cell can be calculated from Impedance data. Thus, experimental response of the cell is obvious in the presented data, which is useful in depth analysis, simulation and material performance investigation in PEM fuel cell researches.

The electrochemical performance of Li-ion batteries (LIBs) including a marine-biochar electrode and ionic-liquid-based hybrid electrolyte has been investigated. The formation of micro/macro-ordered porosity in the biochar structure after pyrolysis provides a three-dimensional (3D) olive-shaped architecture for facile diffusion of electroactive species within the electrode. Three imidazolium-based ionic liquids, namely 1-ethyl-3-methylimidazolium hexafluorophosphate (EMImPF6), 1-ethyl-2,3 dimethylimidazolium hexafluorophosphate (EDImPF6), and 1,3-dimethoxy-2-methylimidazolium hexafluorophosphate [(OM)2MImPF6], were used to fabricate hybrid electrolytes and investigate the effect of the imidazolium cation structure on the safety and electrochemical performance of marine-biomass-based LIBs at various temperatures. Electrochemical characterization was carried out using galvanostatic charge–discharge measurements and electrochemical impedance spectroscopy (EIS). It was found that mixing 40 wt.% (OM)2MImPF6 IL with the organic electrolyte (modified electrolyte) remarkably improved the capacity, cyclability, and coulombic efficiency (CE) of the marine-biochar electrode. After 100 charge–discharge cycles, the capacity retention of the cell containing 40 wt.% (OM)2MImPF6 IL was 85%, 84%, and 81% at 25°C, 45°C, and 65°C, respectively, whereas capacity fading of 35%, 45%, and 68% was observed for the cell without modified electrolyte in this condition. According to EIS analysis, Li+ transfer at the electrode–electrolyte interface was significantly improved in the presence of the modified hybrid electrolyte compared with the other cells. Moreover, the results of thermal and scanning electron microscopy (SEM) analyses proved that this IL could be an appropriate electrolyte to improve the thermal stability and the solid electrolyte interphase (SEI) formation on the marine-biochar surface, respectively.