Pseudocapacitance FeWO 4 Silicon Capacitance LiFePO4 Electrochemical electrodes Graphene Ionic liquid electrolytes Organic battery Transition metals NMR Porous silicon Electrochemical capacitor Current collector Electrochemical impedance spectroscopy Photovoltaics Fuel cell Diazonium chemistry Plasma MAS NMR Organic batteries Redox-active amine Graphite Electrode material Electrochemical capacitors SOEC Ionic conductivity Grafting Electrolytes Microstructure Fe Crystal structure Electrochemical performance Electrode Anode Energy storage Supercapacitor Lithium-ion battery Supercapacitors Perovskite Binder Power performance Ionic liquid EIS Lithium ion battery Diazonium FIB/SEM Electrolyte Lithium-ion batteries Magnetron sputtering Lithium ion batteries CO2 electrolysis Anodes SOFC XPS Interface GGA+U Organic electrode materials Thin films Electrodes Microbatteries Cyclic voltammetry Operando Degradation Aqueous electrolyte Cycling stability Micro-supercapacitors DFT calculations Electrical conductivity Coating Nuclear magnetic resonance spectroscopy Manganese dioxide Li-ion batteries Negative electrode Micro-supercapacitor CVD Exsolution Raman spectroscopy MnO2 Lithium battery DFT Failure mechanism Ionogels Fermi contact Sputtering Lithium batteries Li-ion battery Microdevice Intercalation Nickel oxide Titanium nitride Impedance spectroscopy Batteries Chemical vapor deposition Diazonium salts Vanadium nitride Electrochemistry Positive electrode Activated carbon Cycle performance