King Saud University

Hamad Abdullah Al-Lohedan

Judith J Vijaya

Jothi Ramalingam Rajabathar

M Sivachidambaram

Rajabathar Jothi Ramalingam

The method of making a supercapacitor using porous activated carbon from cow dung includes converting cow dung to porous activated carbon by, in a first step, preparing the dung waste by washing and drying the dung waste, and heating the dung waste in a vacuum environment to form pre-carbonized carbon. In a second step, the pre-carbonized carbon is impregnated with phosphoric acid to form a slurry, which is dried, ground, and heated in a vacuum to between 600-900&#xb0; C. to form porous activated carbon. The porous activated carbon is mixed with a binder, acetylene black, and an organic solvent to form a paste, which is dried on a conductive metal foil to form an electrode. Two such electrodes (an anode and cathode) to are coated with an electrolyte gel (e.g., aqueous potassium hydroxide) and separated by a polymer (e.g., PTFE) membrane to form the supercapacitor.

Supercapacitor using porous activated carbon cow dung

The method of making a supercapacitor using porous activated carbon from cow dung includes converting cow dung to porous activated carbon by, in a first step, preparing the dung waste by washing and drying the dung waste, and heating the dung waste in a vacuum environment to form pre-carbonized carbon. In a second step, the pre-carbonized carbon is impregnated with phosphoric acid to form a slurry, which is dried, ground, and heated in a vacuum to between 600-900&#xb0; C. to form porous activated carbon. The porous activated carbon is mixed with a binder, acetylene black, and an organic solvent to form a paste, which is dried on a conductive metal foil to form an electrode. Two such electrodes (an anode and cathode) are coated with an electrolyte gel (e.g., aqueous potassium hydroxide) and separated by a polymer (e.g., PTFE) membrane to form the supercapacitor.

Method of making a supercapacitor using porous activated carbon from cow dung

The composite electrode material for supercapacitors includes mesoporous manganese dioxide (MnO2), graphene oxide, and nanoparticles of molybdenum disulfide (MoS). The composite material is prepared by preparing mesoporous manganese dioxide, preferably by surfactant-assisted precipitation, then mixing graphene oxide with the mesoporous MnOis ethanol and ultrasonicating, and finally nanoparticles of MoSare mixed with the suspension of graphene oxide and mesoporous MnOto form the composite electrode material. The capacitance of the material may be varied by changing the concentration of MoSnanoparticles. Samples of the composite electrode material exhibited good supercapacitance values, such as 527 and 1160 F/g.

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Riyadh, Saudi Arabia

Hamad Abdullah Al-Lohedan