Nitrogen-rich porous carbon materials have been prepared by pyrolyzing buckwheat with a nano-CaCO₃ template. The buckwheat-derived porous carbons exhibit high nitrogen content (3.14%) and interconnected mesoporous dominated porous structures with some macropores, which endows them high efficient electrochemical energy storage. When they tested as anode materials for sodium ion batteries, an initial reversible capacity of 258 mAh g⁻¹ is obtained at 30 mA g⁻¹, and a high capacity of 185 mAh g⁻¹ can be maintained after 100 cycles. Moreover, this work suggests that the cost-effective biomass material of buckwheat is of great potential to be used as anodes for sodium ion batteries.

富氮多孔碳材料是通过使用纳米CaCO ₃模板热解荞麦而制备的。荞麦衍生的多孔碳显示出高的氮含量（3.14％），并且具有一些大孔的介孔介孔结构相互连接，这使它们具有高效的电化学储能能力。当它们作为钠离子电池的负极材料进行测试时，在30 mA g ^-1下可获得258 mAh g ^-1的初始可逆容量，并且在100次循环后可以保持185 mAh g ^-1的高容量。此外，这项工作表明，具有成本效益的荞麦生物质材料具有巨大的潜力，可以用作钠离子电池的负极。