Various Charge Storage mechanisms

There are several mechanisms that can be used for charge storage in electrical and electronic devices, including:  
  1. Capacitive storage: Capacitive storage, also known as electrostatic storage, involves storing electrical charge on the surface of a conductor. This is achieved by placing two conductive plates separated by an insulating material (the dielectric) in close proximity to each other, forming a capacitor. The charge on the conductor is proportional to the potential difference (voltage) between the two plates, and can be stored and released by applying a voltage across the capacitor.  
  2. Inductive storage: Inductive storage involves storing electrical energy in a magnetic field. This is achieved by placing a coil of wire in a magnetic field and passing an electrical current through the coil, creating a magnetic field around the coil. The energy stored in the magnetic field can be released by passing a current through the coil in the opposite direction.  
  3. Electrochemical storage: Electrochemical storage involves storing electrical energy in the form of chemical energy in a device such as a battery. In a battery, electrical energy is stored in the form of chemical reactions that occur between the electrodes and the electrolyte. The chemical reactions can be reversed by applying a voltage across the electrodes, allowing the stored energy to be released.
  4. Mechanical storage: Mechanical storage involves storing electrical energy in the form of kinetic or potential energy in a device such as a flywheel. The energy is stored by applying a torque to the device, causing it to rotate or move, and can be released by allowing the device to rotate or move in the opposite direction.  
a) EDLC or electric double layer capacitance: physical adsorption of ions characterized by square shaped CV (I = C dV/dt i.e., current proportional to scan rate) Example: Carbon 
Its usually termed as non faradic

b) Pseudocapacitance: surface redox reactions fast enough to produce nearly square shaped CV (current I is proportional to (scan rate)^x where x is close ~1. No peaks or very small redox peaks in CV with small (or no) peak separation Example: MnO2

c) Faradaic (Battery-like) capacity: Sluggish redox reactions with current 'I' usually proportional to (scan rate)^0.5. Well separated redox peaks in CV Example: Ni (OH)2; Li4Ti5O12

Materials with first two charge storage mechanisms fall under one category and are known as capacitive materials whereas materials with third mechanism are know as Faradaic/Battery materials

If you combine two different materials with capacitive mechanisms (EDLC or pseudocapacitance) then configuration is called Asymmetric Supercapacitor.  Example: carbon/carbon (two different carbon); C/MnO2

Capacitive material | Battery-like material
If you combine two materials; one capacitive type and one Battery type then it is called Hybrid Supercapacitor. Example: C/Ni(OH)2; C|Li4Ti5O12

(Capacitive material | Capacitive material)
It is unfortunate that the terms ‘‘asymmetric’’ and ‘‘hybrid’’ have been used in such an ambiguous manner in the literature