Thin films of gadolinium oxide and gadolinium oxide-based electrodes were deposited on a stainless steel substrate employing the successive ionic layer adsorption and reaction (SILAR) method. The X-ray diffraction (XRD) study showed the formation of amorphous material on a substrate and the composition of the material was confirmed by the energy dispersive study (EDS). The water contact angle measurement showed the super-hydrophobic surface of the deposited material. The morphology showed gadolinium oxide resembled finger chip-type morphology while fungus-like and crocodile-back-like morphologies were observed for gadolinium oxide-copper oxide and gadolinium oxide-activated carbon (AC) composite correspondingly. The cyclic voltammetric measurement for supercapacitor application was carried out in a 0.2 M non-aqueous KCl electrolyte. It designated that the gadolinium oxide electrode with 94.22° contact angle had 106.25 F·g-1 specific capacitance. The super capacitance of electrodes was found to be depending on the contact angle concerning composition and morphology. The gadolinium oxide-copper oxide having 156.70° water contact angle possessed a specific capacitance of 52.66 F·g-1 while the gadolinium oxide-AC composite electrode carried 76.20 F·g-1 specific capacitance for 157.49° contact angle.

A transition metal dichalcogenide, molybdenum disulphide (MoS2) possesses unique properties, including a configurable bandgap, and a broad spectrum of potential applications in catalysis, electronics, and energy storage. It proved to be an effective electrode material for supercapacitors due to its high specific capacitance. Here electrochemical performances of MoS2 and its composites with different preparative methods and conditions have been summarized. The main advantages and disadvantages of MoS2-based electrodes are also covered in the review.