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排序方式: 共有90条查询结果,搜索用时 15 毫秒
1.
Zhuoran Lv Baixin Peng Ximeng Lv Yusha Gao Keyan Hu Wujie Dong Gengfeng Zheng Fuqiang Huang 《Advanced functional materials》2023,33(16):2214370
Alloying-type metal sulfides with high theoretical capacities are promising anodes for sodium-ion batteries, but suffer from sluggish sodiation kinetics and huge volume expansion. Introducing intercalative motifs into alloying-type metal sulfides is an efficient strategy to solve the above issues. Herein, robust intercalative In S motifs are grafted to high-capacity layered Bi2S3 to form a cation-disordered (BiIn)2S3, synergistically realizing high-rate and large-capacity sodium storage. The In S motif with strong bonding serves as a space-confinement unit to buffer the volume expansion, maintaining superior structural stability. Moreover, the grafted high-metallicity Indium increases the bonding covalency of Bi S, realizing controllable reconstruction of Bi S bond during cycling to effectively prevent the migration and aggregation of atomic Bi. The novel (BiIn)2S3 anode delivers a high capacity of 537 mAh g−1 at 0.4 C and a superior high-rate stability of 247 mAh g−1 at 40 C over 10000 cycles. Further in situ and ex situ characterizations reveal the in-depth reaction mechanism and the breakage and formation of reversible Bi S bonds. The proposed space confinement and bonding covalency enhancement strategy via grafting intercalative motifs can be conducive to developing novel high-rate and large-capacity anodes. 相似文献
2.
Ziyang Jia Rui Ding Wujiang Yu Yi Li Ailin Wang Miao Liu Feng Yang Xiujuan Sun Enhui Liu 《Advanced functional materials》2022,32(1):2107674
Herein, a trimetallic Ni–Co–Zn perovskite fluoride (ABF3) (denoted as KNCZF) electrode material is explored for advanced aqueous supercabatteries (ASCBs), with KNCZF and activated carbon–FeBiCu@reduced graphene oxides (AC–FeBiCu@rGO) as cathode and anode, respectively, which outperform aqueous supercapacitors (ASCs) and batteries (ABs) with AC and FeBiCu@rGO anodes because of the synergistic effect of pseudocapacitive (KNCZF), capacitive (AC), and faradaic (FeBiCu@rGO) responses. One of the important findings is that the KNCZF shows a typical bulk phase conversion mechanism for charge storage in the alkaline media with the transition of ABF3 perovskite nanocrystals into amorphous metal oxides/(oxy)hydroxides nanosheets, showing the redox-active and redox-inert roles for the Ni/Co and Zn species, respectively, which can be deduced by various ex-situ techniques. Another interesting finding is that the redox-inert Zn species largely enhance the activity of Ni/Co redox-active species in the ABF3 materials, mainly owing to the promotion of surface electroactive sites, adsorption of OH?, and charge transfer of surface Ni/Co atoms by Zn-doping, which can be proved by ex-situ characterizations and theoretical calculations. Overall, this study reveals the structure–activity relationship and charge storage mechanisms of Zn-doping ABF3 materials for advanced ASCBs, showing a great impact on developing advanced electrochemical energy storage. 相似文献
3.
Mesoporous NiS2 Nanospheres Anode with Pseudocapacitance for High‐Rate and Long‐Life Sodium‐Ion Battery
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Ruimin Sun Sijie Liu Qiulong Wei Jinzhi Sheng Shaohua Zhu Qinyou An Liqiang Mai 《Small (Weinheim an der Bergstrasse, Germany)》2017,13(39)
It is of great importance to exploit electrode materials for sodium‐ion batteries (SIBs) with low cost, long life, and high‐rate capability. However, achieving quick charge and high power density is still a major challenge for most SIBs electrodes because of the sluggish sodiation kinetics. Herein, uniform and mesoporous NiS2 nanospheres are synthesized via a facile one‐step polyvinylpyrrolidone assisted method. By controlling the voltage window, the mesoporous NiS2 nanospheres present excellent electrochemical performance in SIBs. It delivers a high reversible specific capacity of 692 mA h g?1. The NiS2 anode also exhibits excellent high‐rate capability (253 mA h g?1 at 5 A g?1) and long‐term cycling performance (319 mA h g?1 capacity remained even after 1000 cycles at 0.5 A g?1). A dominant pseudocapacitance contribution is identified and verified by kinetics analysis. In addition, the amorphization and conversion reactions during the electrochemical process of the mesoporous NiS2 nanospheres is also investigated by in situ X‐ray diffraction. The impressive electrochemical performance reveals that the NiS2 offers great potential toward the development of next generation large scale energy storage. 相似文献
4.
Sheng Huang Chao Meng Min Xiao Shan Ren Shuanjin Wang Dongmei Han Yuning Li Yuezhong Meng 《Small (Weinheim an der Bergstrasse, Germany)》2018,14(21)
Sodium ion batteries (SIB) are considered promising alternative candidates for lithium ion batteries (LIB) because of the wide availability and low cost of sodium, therefore the development of alternative sodium storage materials with comparable performance to LIB is urgently desired. The sodium ions with larger sizes resist intercalation or alloying because of slow reaction kinetics. Most pseudocapacitive sodium storage materials are based on subtle nanomaterial engineering, which is difficult for large‐scale production. Here, ferroelectric Sn2P2S6 with layered nanostructure is developed as sodium ion storage material. The ferroelectricity‐enhanced pseudocapacitance of sodium ion in the interlayer spacing makes the electrochemical reaction easier and faster, endowing the Sn2P2S6 electrode with excellent rate capability and cycle stability. Furthermore, the facile solid state reaction synthesis and common electrode fabrication make the Sn2P2S6 that becomes a promising anode material of SIB. 相似文献
5.
以椰壳活性炭和杏壳活性炭为原料,采用浓硝酸液相氧化改性处理后,制成以 KOH 为电解液的超级电容器的炭电极。采用低温 N_2吸附法表征了活性炭的孔结构性质,并采用循环伏安法和交流阻抗法考察了活性炭电极的电化学性能。实验表明,经浓硝酸氧化处理后,活性炭的比表面积和孔容降低,平均孔径增大。但由于氧化处理后材料赝电容的增加,椰壳活性炭和杏壳活性炭的放电容量不但没有降低.反由原来的114 F·g~(-1)和98 F·g~(-1)分别增大到166 F·g~(-1)和157 F·g~(-1)。同时,浓硝酸氧化降低了活性炭电极的表面电荷迁移电阻和时间常数。 相似文献
6.
结合氧化钌理想的电化学赝电容特性和二氧化锰资源广泛、对环境友好的优势,采用氧化共沉淀法制备出Ru0.1Mn0.9Ox新型电化学电容器复合电极材料,通过循环伏安(CV)、计时电位(Chronopotentiometry)、交流阻抗(AC impedance)、热重-差热(TG/DSC)以及X射线衍射(XRD)等实验研究了电极材料的电化学赝电容性、阻抗特征、晶形结构及热处理温度对材料的晶形和赝电容的影响.结果表明:当热处理温度低于180 ℃时,可制备出稳定、非晶态的Ru0.1Mn0.9Ox;当温度为350 ℃时,复合材料中的无定形二氧化锰已转变为α-MnO2,掺杂的氧化钌晶形不变.与纯MnO2相比,Ru0.1Mn0.9Ox复合电极材料具有较低的极化内阻、较高的比电容、良好的电化学可逆性和显著的电化学赝电容特征. 相似文献
7.
采用循环伏安电沉积技术在钛基上获得水合氧化钌(RuOx·nH2O),其比容量为105F/g。通过电化学测试(循环伏安、恒电流充放电)、X射线衍射(XRD)、扫描电镜(SEM)以及X射线光电子能谱(XPS)等方法研究了沉积物的电化学性质、物相及组成。结果表明:电沉积法获得的水合氧化钌呈非晶态结构,它由多氧化态钌混合羟基氧化物组成。在1.0mol·L-1H2SO4溶液中,该氧化物呈准电容特征,有较高电化学可逆性,可用作电化学电容器电极材料。 相似文献
8.
9.
基于可逆氧化还原反应的赝电容式柔性压力传感器具备高灵敏性能,可用于微弱压力检测,然而,目前赝电容式柔性压
力传感器线性度较差,只能在有限压力区间内保持较高灵敏度。 为此,本文利用 MXene 材料作为电极,设计了一种内部具有孔
隙且表面粗糙的双尺度随机微结构离子凝胶膜,增加了其压缩过程中的缓冲空间,使凝胶膜应力变形更加均匀,确保了灵敏度
在受压过程中保持稳定。 实验数据表明,传感器在 0 ~ 1 MPa 范围内具有超高的线性度(相关系数 ~ 0. 994),优异的灵敏度
( ~ 2 133. 7 kPa
-1
)、快速的响应和恢复时间(分别为~15 和~23 ms),较低的检测限( ~ 2. 5 Pa)和优异的机械稳定性。 将传感器
用于水下,可高线性检测水深,同时传感器可以高灵敏检测到不同水深下螺旋桨扰动产生的微弱水流变化。 相似文献
10.
Magdalena Skunik 《Electrochimica acta》2008,53(11):3862-3869
By modification of surfaces of multi-walled carbon nanotubes with ultra-thin monolayer-type films of phosphododecamolybdic acid, H3PMo12O40, an electrode material with improved capacitance properties is produced. It is apparent from three distinct test experiments (based on cyclic voltammetry, galavanostatic charging-discharging and AC impedance) that capacitors utilizing H3PMo12O40-modified carbon nanotubes are characterized by specific capacitances and energy densities on the levels of 40 F g−1 and 1.3 Wh kg−1, whereas the respective values for the systems built from bare carbon nanotubes are lower, 22 F g−1 and 0.7 Wh kg−1. It is reasonable to expect that fast and reversible multi-electron transfers of the Keggin-type H3PMo12O40 account for the pseudocapacitance effect and significantly contribute to the observed overall capacitance. 相似文献