Recently, several defect control routes benefit the development of potassium ion batteries (PIBs) by significantly ameliorating K⁺ diffusion kinetic and volume expansion in the reaction. However, formation of defects in nanostructure always requires delicate control technology and high cost. In this work, biomass corn silk is applied to serve as inexpensive carbon precursor to fabricate porous carbon microstructure via hydrothermal treatment and one-step carbonization. Facile regulation of carbonization temperature not only adjusts the characteristic of pore structure, but also affects the degree of graphitization. Moreover, the residual N and O element are apt to be doped into the porous carbon structure, which can significantly promote the conductivity and reaction activity. An optimized annealing temperature of 750 °C endows such N, O dual-doped porous carbon (NOPC-750) structure with rich electrolyte accessible sites, high conductivity and suitable structure for rapid K⁺ diffusion. Employed as PIBs anode, NOPC-750 presents a high reversible capacity of 309.8 mAh g⁻¹ at 0.1 A g⁻¹ and high rate performance (retain 105.8 mAh g⁻¹ even at 20 A g⁻¹). The in-depth electrochemical potassium storage mechanism is elaborated, which mainly relies on the capacitance-controlled (surface-driven) contribution, further revealing the rapid reaction kinetics.

最近，通过显着改善K ⁺，一些缺陷控制途径有益于钾离子电池（PIB）的开发。反应中的扩散动力学和体积膨胀。然而，在纳米结构中形成缺陷总是需要精细的控制技术和高成本。在这项工作中，生物质玉米丝被用作廉价的碳前体，通过水热处理和一步碳化来制造多孔碳微结构。碳化温度的简便调节不仅调节孔结构的特征，而且影响石墨化程度。而且，残留的N和O元素易于被掺杂到多孔碳结构中，这可以显着提高电导率和反应活性。优化的750°C退火温度赋予了N，O双掺杂多孔碳（NOPC-750）结构，该结构具有丰富的电解质可及部位，高电导率和适用于快速K的结构⁺扩散。用作阳极的PIB，NOPC-750礼物309.8毫安g的高可逆容量^-1在0.1 A克^-1和高倍率性能（保留105.8毫安克^-1甚至在20 A G ^-1）。详细阐述了深入的电化学钾存储机理，该机理主要依靠电容控制（表面驱动）的作用，进一步揭示了快速的反应动力学。