Chemistry · Materials Science & Electrochemistry

Consider the following statements regarding coordination polymers and their applications in clean energy technologies: I. Coordination polymers are formed through bonding between metal ions and organic ligands to create extended structural frameworks. II. Supercapacitors primarily store energy through electrostatic charge accumulation and generally allow faster charge–discharge cycles than conventional batteries. III. Electro-catalytic water splitting for green hydrogen production necessarily requires fossil-fuel-based thermal energy as the primary energy source. IV. Lower overpotential in an electro-catalyst generally indicates improved efficiency of the electrochemical reaction. Which of the statements given above are correct?