The Preparation And Application Of Biomass Derived-porous Carbon Materials

Since the industrial revolution with the fuels dried up and the environmental pollution, the energy crisis and control air pollution are the major problems faced in the world. To solve these problems, scientist developed new materials using as energy storage and CO₂ capture. Because of its extensive sources, renewable, stable performance, large specific area, biomass derived-carbon materials are widely used in supercapacitor, lithium-ion battery?LIB? sodium-ion battery?SIB? and CO₂ adsorption materials, etc.The main contents of our work are as fellows.1. we prepared N-doped porous carbon materials with supercapacitance performance via a facile KOH hydrothermal process using the stem bark of broussonetia papyrifera?BP? as biomass precursor. Firstly, the BP stem bark is hydrothermally treated in a KOH aqueous solution. After filtration and drying, the hydrothermal product is directly subjected to simultaneous pyrolysis and activation, giving nitrogen-doped porous carbon materials The obtained porous carbon exhibits a high BET surface area of 1212 m²g^-1 and an average pore size of 3.8 nm. Such porous carbon shows outstanding capacitive performance(320 F g^-1 at 0.5 A g^-1), good rate capacitive behavior, and excellent cycling stability?94% of its initia capacitance after 10000 charge-discharge cycles?.2.we present a facile and low-cost approach to synthesize heteroatom doped porous carbon via hydrothermal treatment of stem bark of broussonetia papyrifera?BP? as the biomass precursor in diluted sulfuric acid, and following thermal activation by KOH at 800 ?. The porous carbon possesses a high BET surface area of 1759 m²g^-1 and an average pore size of 3.11 nm as well as hetero-oxygen?9.09%? and nitrogen?1.43%? doping. Such porous carbon shows outstanding capacitive performances of 416 F g^-1 and 300 F g^-1 in three and two-electrode systems, respectively. As a solid-state adsorbent, the obtained porous carbon has an excellent CO₂ adsorption capacity at ambient pressures of up to 6.71 and 4.45 mmol g^-1 at 0 and 25 ?, respectively. The results present one novel precursor-synthesis route for facile large-scale production of high performance porous carbon for a variety of great applications including energy storage and CO₂ capture3. A simple one-step moderate-explosion assisted carbonization strategy is demonstrated for the synthesis of sulfur and nitrogen dual-doped porous carbon nanosheets?CNS? using the mixture of layered-structure camellia petals and ammonium persulfate. The prepared porous carbon nanosheets have high BET surface than 1122 m²g^-1 with sulfur and nitrogen contents of 1.34% and 4.89%, respectively. The electrochemical tests as electrodes materials for supercapacitor, lithium-ion batteries?LIBs? and sodium-ion batteries?SIBs? that the prepared sulfur and nitrogen dual-doped porous carbon nanosheets possess superior energy-storage performance.