盐辅助原位制备氮掺杂多孔炭提高储钾容量和循环稳定性
Salt-assisted in-situ formation of N-doped porous carbons for boosting K+ storage capacity and cycling stability
摘要
Abstract
Potassium-ion batteries (PIBs) have the potential to be used in future large-scale energy storage devices because of the abundance of potassium resources and their relatively high energy density. However, low reversible capacity and poor cycling stabil-ity caused by the large size of the potassium ions limit their practical application. N-doped bacterial cellulose-derived carbons (NBCCs) were prepared by impregnating bacterial cellulose with Mg(NO3)2 solutions (0.03, 0.05 and 0.07 mol L?1) as a pore tem-plate and nitrogen source, followed by carbonization and acid washing. The effects of the Mg(NO3)2 concentration on the morpho-logy, porosity, N doping level and electrochemical performance of the NBCCs were investigated. NBCC (0.05) is the best of the three because it has an interconnected pore network structure with a homogeneous distribution of N at a concentration of 3.38 at％and a high specific surface area of 1355 m2 g?1. It delivers an excellent rate capability of 134 mAh g?1 at 5 A g?1 and a capacity of 307 mAh g?1 after 2500 cycles at 2 A g?1. A NBCC (0.05)-based anode in a potassium ion hybrid capacitor has a high energy dens-ity of 166 W h kg?1 at a power density 493 W kg?1 and excellent cyclability with a capacity retention of nearly 95％ after 2000 cycles. This simple synthesis strategy for fabricating carbon anode materials with an excellent electrochemical performance should promote the development of green and large-scale energy storage devices.关键词
氮掺杂/多孔炭/细菌纤维素/氧化镁模板/钾离子电池Key words
Nitrogen-doped/Porous carbon/Bacterial cellulose/MgO template/Potassium-ion batteries分类
化学化工引用本文复制引用
张文哲,王焕磊,廖冉霞,魏文瑞,李雪纯,刘帅,黄明华,史志成,时婧..盐辅助原位制备氮掺杂多孔炭提高储钾容量和循环稳定性[J].新型炭材料,2021,36(1):167-178,12.基金项目
青岛市应用基础研究计划项目(19-6-2-77-cg) （19-6-2-77-cg）
山东省重点研发计划(公益类科技攻关)(2019GGX102038) （公益类科技攻关）
中央高校基本科研业务费专项(201822008, 201941010) （201822008, 201941010）
山东省自然科学基金资助项目面上项目(ZR2020ME038) （ZR2020ME038）
国家自然科学基金(21471139, 21775142).The authors would like to offer special thanks to Qingdao City Programs for Science and Technology Plan Projects (19-6-2-77-cg) （21471139, 21775142）
Shandong Provincial Key R&D Plan and the Public Welfare Special Pro-gram, China (2019GGX102038) （2019GGX102038）
Fundamental Re-search Funds for the Central Universities (No. 201822008 and 201941010) （No. 201822008 and 201941010）
the Shandong Provin-cial Natural Science Foundation, China (ZR2020ME038) （ZR2020ME038）
National Natural Science Founda-tion of China (21471139, 21775142). （21471139, 21775142）
