Supercapacitors using binderless composite monolith electrodes from carbon nanotubes and pre-carbonized biomass residues

A New Approach towards Improving the Specific Energy and Specific Power of a Carbon-Based Supercapacitor using Platinum-Nanoparticles on Etched Stainless Steel Current Collector

“…The SACGs were converted into green monoliths (GMs) using a mold (20 mm in diameter) and 250 kg cm ¹2 of compressive force before they were carbonized at 800°C under N 2 atmosphere with a heating profile used in our previous study to produce carbon monoliths (CMs). 21 The CMs from the GMs were activated by a CO 2 activation process at a temperature of about 800°C (heating rate of 5°C per min) for an activation time of ³3 h to produce ACMs, following the procedure mentioned in our work reported previously. 21 The ACMs were polished to the desired thickness ('0.4-0.5 mm) and then washed with a copious amount of distilled water and dried until PH ³7 was achieved.…”

“…21 The CMs from the GMs were activated by a CO 2 activation process at a temperature of about 800°C (heating rate of 5°C per min) for an activation time of ³3 h to produce ACMs, following the procedure mentioned in our work reported previously. 21 The ACMs were polished to the desired thickness ('0.4-0.5 mm) and then washed with a copious amount of distilled water and dried until PH ³7 was achieved.…”

“…Higher potential can be controlled by modifying the electrolyte properties, 12,13 while a lower ESR value can be achieved by reducing the internal resistance of the electrode and the contact resistance between the electrodes and the current collectors. 9 It has been observed that supercapacitors with low ESR values can be fabricated by modifying aluminium current collectors with carbon material via sol-gel and coating, 11 modifying aluminium current [15][16][17][18][19][20][21][22][23][24][25][26] Studies on the modification of separators have also been reported elsewhere. 27,28 Recently, the low ESR value has been achieved by modifying the SS current collector by the deposition of platinum nanoparticles, wherein the modified current collector was tested in supercapacitor cell fabricated with activated carbon monolith (ACM) electrode derived from rubber wood saw dust.…”

“…29 In the present study, an approach to reduce the ESR values of a supercapacitor cell is carried out by modifying the surface of the SS current collector (316L), viz by growing platinum nanoparticles (PtNs) on its etched surface and then getting this modified surface in contact with the monolithic form of carbon electrodes which was prepared from pre-carbonized fibres of oil palm empty fruit bunches (OPEFB). [20][21][22][23]29 The role of etching prior to PtNs deposition on the current collector surface was found to be very significant in enhancing the power and energy of the supercapacitor cells.…”

Nanoporous separators for supercapacitor using activated carbon monolith electrode from oil palm empty fruit bunches

“…For carbon based supecapacitor, it is important to use highly porous carbon electrodes having pore size, structure and network which are compatible with the size of electrolyte ions; to ensure that the highest possible numbers of ions are accumulated at almost all available pore walls in the electrodes. In order to achieve this condition, different types of supercapacitor activated carbon electrodes (paste [2], fiber-cloth [3], fibre-sheet [4], composite [5][6][7], film [8], monolith [9,10]) have been developed and tested in different types of conventional electrolytes (Na2SO4, H2SO4, KOH etc.) or newly developed electrolytes.…”