Biomaterials play a significant role in energy storage devices owing to their renewable, inexpensive and eco-friendly peculiarity. In this study, potato biomass porous carbon (PBPC), which was fabricated by a facile two-step carbonization, was used as the anode material for potassium-ion batteries (KIBs). The crystal structure and mesoporous morphology of the carbon derivative at various carbonation temperatures are fully investigated. The electrochemical performance of PBPC electrodes is evaluated, presenting a high reversible specific capacity (248 mA h g⁻¹ at 100 mA g⁻¹), an excellent rate performance (152 mA h g⁻¹ at 1000 mA g⁻¹) and a superior cycle stability (almost no capacity decay after 400 cycles at a current density of 500 mA g⁻¹ with a Coulombic efficiency about 100%). The superior electrochemical performance is mainly attributed to the uniformly distributed mesopores on PBPC electrode which facilitate the electrolyte transportation and diffusion. This work provides a simple and novel strategy to construct porous carbon as high-performance anode materials for KIBs through a sustainable and environment-friendly way.

由于生物材料具有可再生，廉价和生态友好的特性，因此在储能设备中起着重要作用。在这项研究中，马铃薯的生物质多孔碳（PBPC）是通过简单的两步碳化制成的，被用作钾离子电池（KIBs）的负极材料。充分研究了碳衍生物在不同碳化温度下的晶体结构和介孔形态。PBPC电极的电化学性能进行评价时，呈现高的可逆比容量（248毫安ħ克^-1在100mA克^-1），优异的倍率性能（152毫安ħ克^-1以1000mA克^-1）和出色的循环稳定性（在500 mA g ^-1的电流密度下，在400个循环后几乎没有容量衰减，库仑效率约为100％）。优异的电化学性能主要归因于PBPC电极上均匀分布的中孔，有利于电解质的运输和扩散。这项工作提供了一种简单而新颖的策略，即通过可持续和环境友好的方式将多孔碳构造为KIB的高性能阳极材料。