Phosphorus and Nitrogen Codoped Porous Carbon Nanosheets for Energy Storage and Gas Adsorption

Le résumé fourni par la source

Heteroatom-doped porous carbon has emerged as a promising candidate for capacitive energy and gas storage applications because of its abundant availability and cost-effectiveness. In this study, a solvothermal strategy was adopted to synthesize phosphorus (P) and nitrogen (N) codoped activated carbon (PCN- x ) with an abundance of micropores, which can be utilized in both energy storage and gas (such as H 2 and CO 2 ) adsorption applications. The optimized P and N codoped porous carbon activated at 800 °C (PCN-800) shows a very high specific capacitance ( C s ) of 575.15 F g –1 in an acid medium, and the C s value was calculated to be 477.63 F g –1 under a 1 A g –1 current in an alkaline medium. The symmetric device performance shows an excellent energy density of 10.61 W h kg –1 at a power density of 250 W kg –1 along with a capacitance retention of 91.23% up to 10,000 cycles in an alkaline medium. The P and N codoped porous carbon activated at 900 °C (PCN-900) shows a high specific surface area (SSA) of 2953.2 m 2 g –1 with a high micropore volume of 0.77 cc g –1 . It also shows a good H 2 storage capacity of 3.26 wt % at 77 K and 1 bar pressure. The CO 2 adsorption capacities were calculated to be 5.98 mmol g –1 at 0 °C and 3.61 mmol g –1 at 25 °C with good selectivity of CO 2 /N 2 and CO 2 /CH 4 . The incorporation of P and N codoped species into porous carbon nanosheets presents a promising avenue for improving the performance of energy and gas storage applications. The synergistic effects of P and N doping and the porous morphology and high SSA contribute to the improved electrochemical performance, enabling higher energy and power densities in supercapacitor devices along with good H 2 and CO 2 uptake capacities.

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