Hard carbons as promising anode materials for Na-ion batteries(NIBs) have captured extensive attention because of their low operation voltage, easy synthesis process, and competitive specific capacity. However, there ...Hard carbons as promising anode materials for Na-ion batteries(NIBs) have captured extensive attention because of their low operation voltage, easy synthesis process, and competitive specific capacity. However, there are still several disadvantages, such as high cost and low initial coulombic efficiency, which limit their large-scale commercial applications.Herein, pine nut shells(PNSs), a low-cost biomass waste, are used as precursors to prepare hard carbon materials. Via a series of washing and heat treatment procedures, a pine nut shell hard carbon(PNSHC)-1400 sample has been obtained and delivers a reversible capacity of around 300 mAh/g, a high initial coulombic efficiency of 84%, and good cycling performance. These excellent Na storage properties indicate that PNSHC is one of the most promising candidates of hard carbon anodes for NIBs.展开更多
对超临界CO2萃取红松种壳中的抗氧化成分进行了研究。分析了其抗氧化成分与超临界CO2提取的压力、时间、温度之间的关系,得出超临界CO2萃取红松种壳中抗氧化性物质的最佳条件为压力40 MPa、温度35℃、时间120 m in,萃取物得率为2.4%,抗...对超临界CO2萃取红松种壳中的抗氧化成分进行了研究。分析了其抗氧化成分与超临界CO2提取的压力、时间、温度之间的关系,得出超临界CO2萃取红松种壳中抗氧化性物质的最佳条件为压力40 MPa、温度35℃、时间120 m in,萃取物得率为2.4%,抗氧化性较强部分占其中的42.1%。并且发现红松种壳提取物对豆油具有明显的抗氧化作用,并具有剂量效应的关系,在添加量为0.6%时抗氧化效果最好。展开更多
基金Project supported by the President Fund Project of China Institute of Atomic Energy
文摘Hard carbons as promising anode materials for Na-ion batteries(NIBs) have captured extensive attention because of their low operation voltage, easy synthesis process, and competitive specific capacity. However, there are still several disadvantages, such as high cost and low initial coulombic efficiency, which limit their large-scale commercial applications.Herein, pine nut shells(PNSs), a low-cost biomass waste, are used as precursors to prepare hard carbon materials. Via a series of washing and heat treatment procedures, a pine nut shell hard carbon(PNSHC)-1400 sample has been obtained and delivers a reversible capacity of around 300 mAh/g, a high initial coulombic efficiency of 84%, and good cycling performance. These excellent Na storage properties indicate that PNSHC is one of the most promising candidates of hard carbon anodes for NIBs.
文摘对超临界CO2萃取红松种壳中的抗氧化成分进行了研究。分析了其抗氧化成分与超临界CO2提取的压力、时间、温度之间的关系,得出超临界CO2萃取红松种壳中抗氧化性物质的最佳条件为压力40 MPa、温度35℃、时间120 m in,萃取物得率为2.4%,抗氧化性较强部分占其中的42.1%。并且发现红松种壳提取物对豆油具有明显的抗氧化作用,并具有剂量效应的关系,在添加量为0.6%时抗氧化效果最好。
