物理化学学报2024，Vol.40Issue(5)：25-27,3.DOI:10.3866/PKU.WHXB202306011
电化学置换反应制备石墨烯基纳米无定型锑复合阳极用于高性能钠离子电容器的构筑
Galvanic Replacement Synthesis of Graphene Coupled Amorphous Antimony Nanoparticles for High-Performance Sodium-Ion Capacitor
摘要
Abstract
Sodium-ion energy storage devices are considered as an ideal substitute for popular lithium-ion counterparts because of its resource richness and environmental friendliness.Among the various sodium-ion energy storage devices,sodium-ion capacitors(SICs)have the combined advantages in high energy and power densities as well as long-term cycling stability in theory.Antimony(Sb)is considered as an attractive anode material for SICs due to its high theoretical capacity of 660 mAh∙g-1,low operating potential(0.5-0.8 V vs.Na/Na+),and high density of 6.68 g∙cm-3.However,the large volume change of Sb during the Na+insertion leads to fast decay in capacity and poor rate capability,which becomes a fundamental issue greatly hindering the practical application.Herein,a facile galvanic replacement approach is proposed for the synthesis of an ultrafine amorphous Sb nanoparticles anchoring on carbon coated two-dimensional(2D)reduced graphene oxides(RGO).Half-cell test(vs.metal Na)shows that as-prepared Sb-C@RGO anode delivers a high specific capacity of 521.5 mAh∙g-1 at 0.1 A∙g-1.As the current density increases to 10 A∙g-1,Sb-C@RGO anode still maintains a specific capacity of 83.5 mAh∙g-1,suggesting its high-rate properties.The excellent Na+charge storage property of Sb-C@RGO anode is primarily due to its unique 2D hybrid architecture,which largely increases the atomic interface contact with Na+and shortens ion diffusion path,thus facilitating ion/electron transfer.To demonstrate the feasibility of Sb-C@RGO as the high-performance electrode for emerging energy-storage devices,a hybrid cell configuration(e.g.,SIC)was fabricated by employing the Sb-C@RGO as the negative electrode(battery type)and home-made activated carbon(PDPC)as the positive electrode(capacitive type)in a Na+based organic electrolyte.This SIC is capable of operating at a high voltage of 4.0 V and exhibiting a high energy density of 140.75 Wh∙kg-1 at a power density of 250.84 W∙kg-1.Even the power density is magnified～50 times to 12.43 kW∙kg-1,this SIC still delivers a high energy density of 55 Wh∙kg-1.Within a short charge/discharge of～3.2 min,this SIC can store/release quite a high energy density of 108.5 Wh∙kg-1,which represents the remarkable performance among the reported Sb-based capacitors.In addition,this SIC shows the good cycling stability with an acceptable capacity retention value of 66.27%after 1000 cycles at a current density of 2 A∙g-1.Our results may provide insight into the rational design and construction of high-capacity Sb-based anode materials for advanced sodium-ion based energy storage devices.关键词
石墨烯/锑基阳极/电化学置换反应/二维复合材料/钠离子电容器Key words
Graphene/Sb anode/Galvanic replacement reaction/2D composite/Sodium-ion capacitor分类
化学引用本文复制引用
米超林,秦玉莹,黄欣莉,罗伊杰,张志薇,王成祥,石元昌,尹龙卫,王儒涛..电化学置换反应制备石墨烯基纳米无定型锑复合阳极用于高性能钠离子电容器的构筑[J].物理化学学报,2024,40(5):25-27,3.基金项目
The project was supported by the National Natural Science Foundation of China(52272224,5190218),the Innovation Capacity Improvement Project of Small and Medium-Sized Technology-Based Enterprise of Shandong Province(2021TSGC1149),and the Youth Innovation Team Project of Shandong Provincial Education Department(10000082295015). 国家自然科学基金(52272224,5190218),山东省科技型中小企业创新能力提升工程(2021TSGC1149)和山东省高等学校青年创新团队发展计划(10000082295015)资助项目 （52272224,5190218）
