具有P和S双空位的镍钴纳米花复合材料用作超级电容器电极的研究  

A Study on Nickel-Cobalt Nanoflower Composite Materials with P and S Double Vacancies as Supercapacitor Electrodes

作　　者：吴学虎 孙立贤[1] 徐芬[1] 李彬 方淞文 张靖 陈翔 宋领君 卢俊铭 高源 杜毛湛 徐如丹 WU Xuehu;SUN Lixian;XU Fen;LI Bin;FANG Songwen;ZHANG Jing;CHEN Xiang;SONG Lingjun;LU Junming;GAO Yuan;DU Maozhan;XU Rudan(Guangxi Key Laboratory of Information Materials&Guangxi Collaborative Innovation Center for Structure and Properties for New Energy and Materials,School of Material Science and Engineering,Guilin University of Electronic Technology,Guilin 541004,Guangxi,China)

机构地区：[1]桂林电子科技大学材料科学与工程学院,广西信息材料重点实验室暨广西新能源与材料结构与性能协同创新中心,广西桂林541004

出　　处：《材料导报》2025年第7期10-16,共7页Materials Reports

基　　金：广西科技计划(桂科AA24206022);国家自然科学基金(U20A20237;52461032;52371218;52271205;552101245);广西科学研究与技术开发计划项目(AA19182014;AD17195073;AA17202030-1;2021AB17045AB21220027);国家重点研发计划(2018YFB1502103;2018YFB1502105;2022YFB4003200);广西八桂学者基金;桂林漓江学者基金;广西新能源与新材料结构与性能协同创新中心;广西先进功能材料基础与应用人才小高地;桂林市科学研究与技术开发项目(20210102-4);广西信息材料重点实验室(201001);广西植物功能物质可持续利用重点实验室(FPRU2022-4)。

摘　　要：近年来,多元过渡金属氧化物和硫化物在超级电容器电极材料领域备受关注,其中NiCo_(2)S_(4)其低成本、低电负性和强的电化学活性而成为研究热点。然而,NiCo_(2)S_(4)电子电导率较低,反应动力学较慢,导致比容量低,倍率性能差,容量衰减快,实际应用受限。因此,提高NiCo_(2)S_(4)的电导率和反应速率是提高其电化学性能的关键。本工作采用水热法、硫化法和磷化法制备了具有P、S双空位的镍钴纳米花(P-NiCo_(2)Sn),其在磷化过程中可以同时获得P掺杂和S空位双缺陷。双缺陷可以调节电子结构,产生丰富的电化学位点,促进电子转移和改善反应动力学。该纳米花结构的比表面积为66.342 m^(2)·g^(-1)。P-NiCo_(2)Sn电极在1 A·g^(-1)电流密度下的比电容为1257 F·g^(-1),在800 W·kg^(-1)功率密度下表现出44.2 Wh·kg^(-1)的能量密度。组装的P-NiCo_(2)Sn//AC非对称超级电容器在10000次连续充电/放电循环后的容量保持率为89.9%。Multinary transition metal oxides and sulfides have garnered intensive interest in the field of supercapacitor electrodes,among which NiCo_(2)S_(4) has been considered as a hotspot owing to its low cost,low electronegativity and strong electrochemical activity.However,its low electron conductivity and sluggish reaction kinetics have resulted in low specific capacitance,poor rate performance,and rapid capacity decay,limiting its practical applications.Therefore,enhancing the electron conductivity and reaction kinetics of NiCo_(2)S_(4) is crucial for improving its electrochemical performance.In this study,phosphorus and sulfur co-defected nickel cobalt nanoflowers(P-NiCo_(2)Sn)were synthesized via hydrothermal,sulfidation,and phosphorization methods.During the phosphorization process,both P doping and S vacancy double defects were obtained.These double defects can modulate the electronic structure,generate abundant electrochemical active sites,facilitate electron transfer,and promote reaction dynamics.Moreover,the nanoflower structure has a specific surface area of 66.342 m^(2)·g^(-1).The P-NiCo_(2)Sn electrode exhibits a specific capacitance of 1257 F·g^(-1) at a current density of 1 A·g^(-1),and an energy density of 44.2 Wh·kg^(-1) at a power density of 800 W·kg^(-1).The assembled P-NiCo_(2)Sn//AC asymmetric supercapacitor retains 89.9%of its capacity after 10000 consecutive charge/discharge cycles.

关 键 词：缺陷 磷化法 纳米花 高循环性能 

分 类 号：TB34[一般工业技术—材料科学与工程]