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- 저자 : Sundramoorthy Ashok K. (검색결과 2 건)
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Atchudan Raji,Perumal Suguna,Sundramoorthy Ashok K.,Manoj Devaraj,Kumar Raju Suresh,Almansour Abdulrahman I.,Sangaraju Sambasivam,Lee Wonmok,Lee Yong Rok 한국화학공학회 2024 Korean Journal of Chemical Engineering Vol.41 No.6
The growing energy demand and environmental issues have encouraged the development of novel and sustainable energy. Hydrogen is one of the cleanest and most sustainable energy sources that provides an environmentally friendly alternative future fuel. The recent development in hydrogen production through electrocatalytic water-splitting is somewhat highperformance. The potential electrocatalysts play an essential role in hydrogen evolution reactions (HER) for electrochemical water splitting, where expensive and low-abundance platinum-based materials are the standard catalysts for HER. Herein, metal-free, low-cost, and naturally abundant chebulic myrobalan was employed as a source for the preparation of porous carbon by direct pyrolysis route, and the resulting porous carbon was utilized as an electrocatalyst for the production of hydrogen gas. The various analytical techniques confi rmed the existence of sulfur, nitrogen, and oxygen in the prepared chebulic myrobalan-derived porous carbon (CM-PC). The presence of eff ective heteroatoms in the CM-PC may lead to interactive eff ects between the heteroatoms and porous carbon structures; this suggests the enhancement of the electrochemical performance of HER. The surface area of CM-PC was obtained as 675 m 2 g −1 by BET measurement. The CM-PC exhibited a moderate degree of graphitization with hydrophilic functionalities. Based on these excellent properties, the CM-PC was used as an electroactive material to fabricate the working electrode and as a metal-free electrocatalyst for HER in a 0.5 M H 2 SO 4 aqueous solution. The resulting CM-PC delivered a superior catalytic activity toward HER with a Tafel slope of ~ 79 mV decade –1 (Overpotential − 166 mV RHE at a current density of − 10 mA cm –2 ) and excellent long-term stability in an acidic medium. Importantly, these fi ndings prove that the chebulic myrobalan (biomass) was turned into an eff ective electrocatalyst for hydrogen generation in the economical route, thereby challenging the uniqueness of platinum catalysts in the hydrogen economy. The result indicates that as-prepared catalysts (CM-PC) have excellent application value in energy and environment.
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Iro Zaharaddeen S.,Subramani C.,Rajendran Jerome,Sundramoorthy Ashok K. 한국탄소학회 2021 Carbon Letters Vol.31 No.6
Recently, activated carbon derived from diferent agricultural by-products or bio-waste is receiving a great deal of attention due to its low or zero cost and environmental friendliness. In this work, fowers obtained from Borassus fabellifer (BFL) is used as a carbon source and potassium hydroxide (KOH) as activation precursor to produce activated carbon with high specifc surface area and predominant micropore. The obtained carbon material was activated at 650 °C. The as-prepared sample had a specifc surface area of 930.3 m2 /g and pore size distribution of 1.96 nm. The carbon material exhibited high electrochemical performance with a specifc capacitance of 247 F/g at 0.5 A/g in 1 M H2SO4 electrolyte and an excellent cycling stability of 94% after 2500 cycles. A specifc energy of 101.1 Wh/kg and a specifc power of 4500 kW/kg were obtained. Based on the electrochemical properties exhibited by BFL, it could be used as an excellent electrode material for supercapacitor applications.
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