APPLIED SURFACE SCIENCE
·
2021
·
IF 6.707
Mengmeng Yang,Qingquan Kong,Wei Feng,Weitang Yao,Qingyuan Wang
Due to its relatively high theoretical capacity and low cost, transition metal oxides are considered as candidate anodes for potassium ion batteries (KIB). However, poor recyclability due to inherently large volume changes hinders their application. Therefore, we use Ganoderma spores as the carbon matrix to synthesize MoO 2 /N/C composites through simple complexation reactions. It was found that the synergistic effect of cage-like biomass carbon and molybdenum oxide can promote the transfer and adsorption of potassium ions, thereby improving the storage capacity of potassium ions. On the one hand, the introduction of a small amount of MoO 2 greatly enhances the potassium storage capacity of biomass carbon materials. On the other hand, the porous cage-like carbon structure effectively buffers the volume change during the MoO 2 potassium storage process and provides more diffusion paths for K + . In addition, the stable double-walled cage structure provides the possibility for the composite material to achieve good long-cycle performance. Specifically, MoO 2 /N/C composites provided a high reversible specific capacity of 422 mAh g −1 (after 200 cycles) at 200 mA g −1 , and coulombic efficiency was greater than 98%. The composites still provided a high capacity of 316 mAh g −1 after 500 cycles at 500 mA g −1 . At the same time, after 1500 cycles at 2000 mA g −1 , the capacity was maintained at 248 mAh g −1 . Verify the possibility of its practical application by assembling a full battery, meanwhile, through first-principles calculations, the reasons for the excellent potassium storage performance of MoO 2 /N/C electrodes are discussed.
研究领域:
材料科学
·
电化学
·
能源存储
✓ 已验证
产品关联
DOI
高影响因子
Scientific Reports
·
2016
·Vol. 6
·期 1
·1-7
·
IF 5.228
Yu Huitao,Zhang Bangwen,Bulin Chaoke,Li Ruihong,Xing Ruiguang
As an important precursor and derivate of graphene, graphene oxide (GO) has received wide attention in recent years. However, the synthesis of GO in an economical and efficient way remains a great challenge. Here we reported an improved NaNO 3 -free Hummers method by partly replacing KMnO 4 with K 2 FeO 4 and controlling the amount of concentrated sulfuric acid. As compared to the existing NaNO 3 -free Hummers methods, this improved routine greatly reduces the reactant consumption while keeps a high yield. The obtained GO was characterized by various techniques, and its derived graphene aerogel was demonstrated as high-performance supercapacitor electrodes. This improved synthesis shows good prospects for scalable production and applications of GO and its derivatives.
研究领域:
材料科学
·
化学工程
·
能源技术
✓ 已验证
DOI
PubMed
高影响因子
Journal of Energy Chemistry
·
2021
·
IF 9.676
Yichen Du,Zuyue Yi,Bingbing Chen,Jingyi Xu,Zhuangzhuang Zhang,Jianchun Bao,Xiaosi Zhou
Phosphorus-based anodes are highly promising for potassium-ion batteries (PIBs) because of their large theoretical capacities. Nevertheless, the inferior potassium storage properties caused by the poor electronic conductivity, easy self-aggregation, and huge volumetric changes upon cycling process restrain their practical applications. Now we impregnate Sn 4 P 3 nanoparticles within multilayer graphene sheets (Sn 4 P 3 /MGS) as the anode material for PIBs, greatly improving its potassium storage performance. Specifically, the graphene sheets can efficiently suppress the aggregation of Sn 4 P 3 nanoparticles , enhance the electronic conductivity, and sustain the structural integrity. In addition, plenty of Sn 4 P 3 nanoparticles impregnated in MGS offer a large accessible area for the electrolyte, which decreases the diffusion distance for K + and electrons upon K + insertion/extraction, resulting in an improved rate capability. Consequently, the optimized Sn 4 P 3 /MGS containing 80 wt% Sn 4 P 3 (Sn 4 P 3 /MGS-80) exhibits a high reversible capacity of 378.2 and 260.2 mAh g −1 at 0.1 and 1 A g −1 , respectively, and still delivers a large capacity retention of 76.6% after the 1000th cycle at 0.5 A g −1 .
研究领域:
材料科学
·
能源存储
✓ 已验证
DOI
高影响因子
Journal of Energy Storage
·
2025
·
IF 9.8
Jiaxin Ou,Wenqing Xu,Ye Sun,Honghai Zhang,Yuchao He,Zongyi Wen,Yachun Lu,Jianwen Yang,Quanqi Chen
Potassium vanadium phosphate (K 3 V 3 (PO 4 ) 4 ) has emerged as one of the most promising cathode candidates for potassium-ion batteries because of exceptionally stable structural framework, yet suffers from intrinsic poor electronic conductivity characteristic of polyanionic compounds. Herein, a strategic Mg 2+ doping approach was adopted to prepare Mg-doped K 3 V 3 (PO 4 ) 4 /C (K 3+x V 3-x Mg x (PO 4 ) 4 /C, x = 0.1, 0.2 and 0.3) composites, where larger Mg 2+ (0.72 Å) substitution for V 3+ (0.64 Å) effectively widens K + diffusion pathways. Optimal doping of Mg 2+ significantly elevates K + diffusion, rate capability, and cyclability beyond undoped K 3 V 3 (PO 4 ) 4 /C. The optimal K 3.2 V 2.8 Mg 0.2 (PO 4 ) 4 /C (Mg0.2-KVP/C) demonstrates comprehensive performance enhancements over pristine K 3 V 3 (PO 4 ) 4 /C, exhibiting 16.5 % higher initial discharge capacity (67.0 vs. 57.5 mAh g −1 ) at 1C with significantly improved cycling stability (85.8 % vs. 65.5 % capacity retention after 150 cycles). Notably, Mg0.2-KVP/C maintains 63.8 % larger capacity at 5C rate (53.4 vs. 32.6 mAh g −1 ) while achieving capacity retention of 75.2 % after 1000 cycles-representing a 50 % improvement in long-term cycle stability compared to the undoped K 3 V 3 (PO 4 ) 4 /C. The significant improvement in electrochemical performance of K 3 V 3 (PO 4 ) 4 /C upon Mg doping suggests that strategic ionic doping is an effective strategy for improving potassium storage performance of K 3 V 3 (PO 4 ) 4 /C and other polyanionic compounds for potassium-ion batteries.
研究领域:
材料科学
·
电化学
·
能源存储
·
无机化学
·
固态化学
✓ 已验证
DOI
高影响因子
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
·
2023
·Vol. 120
·期 30
·e2301622120
·
IF 11.1
Qingfeng Fu,Chi Peng,Wang Zhou,Xiangni Zhang,Keke Yang,Lanzi Chen,Ying Mo,Jian-Fang Wu,Peng Gao,Changling Fan,Chaohe Xu,Zhaohui Wang,Jilei Liu
Potassium vanadium fluorophosphate (KVPO4F) is regarded as a promising cathode candidate for potassium-ion batteries due to its high working voltage and satisfactory theoretical capacity. However, the usage of electrochemically inactive binders and redundant current collectors typically results in inferior electrochemical performance and low energy density, thus implying the important role of rational electrode structure design. Herein, we have reported a scalable and cost-effective synthesis of a cellulose-derived KVPO4F self-supporting electrode, which features a special surface hydroxyl chemistry, three-dimensional porous and conductive framework, as well as super flexible and stable architecture. The cellulose not only serves as a flexible substrate, a pore-forming agent, and a versatile binder for KVPO4F/conductive carbon but also enhances the K-ion migration ability. Benefiting from the special hydroxyl chemistry-induced storage mechanism and electrode structural stability, the flexible freestanding KVPO4F cathode exhibits high-rate performance (53.0% capacity retention with current densities increased 50-fold, from 0.2 C to 10 C) and impressive cycling stability (capacity retention up to 74.9% can be achieved over 1,000 cycles at a rate of 5 C). Such electrode design and surface engineering strategies, along with a deeper understanding of potassium storage mechanisms, provide invaluable guidance for better electrode design to boost the performance of potassium-ion energy storage systems.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
PubMed
高影响因子
MEASUREMENT SCIENCE and TECHNOLOGY
·
2010
·Vol. 21
·期 5
·055802
·
IF 1.317
Hui Xu,Xiaoxi Yang,You Wang,Junbao Zheng,Zhiyuan Luo,Guang Li
A sensor based on the screen-printing technique for the rapid blood potassium test was developed. The sensor consists of a thick film potassium ion-selective electrode and a reference electrode. Poly(3,4-ethylenedioxythiophene) (PEDOT) doped with poly(styrenesulfonate) (PSS) was screen-printed on carbon electrodes as an internal solid contact layer for both ion-selective and reference electrodes. PVC membranes with and without selective ionphore valinomycin were coated on the PEDOT/PSS layer to form potassium ion-selective and reference electrodes, respectively. The potentiometric response characters were evaluated. The response time of the sensor was 15 s when less than 15 µL of sample was applied. The sensitivity of the potassium sensor was around 60 mV per decade, while the potentiometric log selectivity coefficients were −3.43 and −3.48 for Na+ and Ca2+, respectively.
研究领域:
医学工程
·
生物传感
·
材料科学
✓ 已验证
DOI
高影响因子
ADVANCED MATERIALS
·
2020
·Vol. 32
·期 23
·1908027
·
IF 27.398
Shuai Dong,Dandan Yu,Jie Yang,Li Jiang,Jiawei Wang,Liwei Cheng,Yan Zhou,Honglei Yue,Hua Wang,Lin Guo
Currently, exploring high-volumetric-capacity electrode materials that allow for reversible (de-)insertion of large-size K + ions remains challenging. Tellurium (Te) is a promising alternative electrode for storage of K + ions due to its high volumetric capacity, confirmed in lithium-/sodium-ion batteries, and the intrinsic good electronic conductivity. However, the charge storage capability and mechanism of Te in potassium-ion batteries (KIBs) have not been unveiled until now. Here, a novel K–Te battery is constructed, and the K + -ion storage mechanism of Te is revealed to be a two-electron conversion-type reaction of 2K + Te ↔ K 2 Te, resulting in a high theoretical volumetric capacity of 2619 mAh cm −3 . Consequently, the rationally fabricated tellurium/porous carbon electrodes deliver an ultrahigh reversible volumetric capacity of 2493.13 mAh cm −3 at 0.5 C (based on Te), a high-rate capacity of 783.13 mAh cm −3 at 15 C, and superior long-term cycling stability for 1000 cycles at 5 C. This excellent electrochemical performance proves the feasibility of utilizing Te as a high-volumetric-capacity active material for storage of K + ions and will advance the practical application of KIBs.
研究领域:
储能
·
材料科学
·
电化学
·
电池技术
✓ 已验证
DOI
高影响因子
Journal of Energy Storage
·
2025
·
IF 9.8
Fanteng Ma,Chengshuo Hou,Ziheng Zhou,Zhen Li,Yingjie Dong,Jinglin Mu,Xiaozhong Wu,Jin Zhou
Potassium-ion batteries (PIBs) are emerging as a viable alternative to lithium-ion batteries due to the abundance of potassium resources and a standard electrode potential of K + /K close to that of Li + /Li. However, the larger ionic radius of K + induce huge volume change of electrode materials and slow electrochemical kinetics, significantly limiting the K + storage capacity and cycling stability of PIBs. Herein, S-doped porous carbon nanosheets (S-PCNs) are prepared by a facile direct sulfuration method. The S-PCNs-500 possesses high sulfur doping level of 9.1 at.% composed of covalent sulfur (C-S-C), oxidized sulfur, and some trapped molecular sulfur. This sample exhibits excellent potassium ion storage performance as anode material of PIBs, such as high capacity of 448 mAh g −1 at 0.05 A g −1 , high-rate capability of 180 at 10 A g −1 , and long cycle life with 252 mA h g −1 at 1 A g −1 after 1200 cycles. A full cell with a S-PCNs-500 anode and K 0.4 Mn 0.9 Li 0.1 O 2 0.33H 2 O cathode delivers a reversible capacity of 160 mAh g −1 at 0.1 A g −1 , responding to an energy density of 306.4 Wh kg −1 . These characteristics are attributed to the reversible intercalation of K + into the expanded carbon layers, pseudocapacitive K + sorption at structural chemical defects, and reversible electrochemical reaction between K + and C-S-C.
✓ 已验证
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2019
·
IF 5.155
Shuo Wang,Yanyan Li,Fanteng Ma,Xiaozhong Wu,Pengfei Zhou,Zhichao Miao,Peibo Gao,Shuping Zhuo,Jin Zhou
Potassium ion batteries (PIBs) have received widespread attention nearly four years due to sufficient potassium resources and similar chemical properties of potassium to lithium. Several works reported that N-doping on the carbon electrodes could efficiently improve the storage capacity of potassium ions. Herein, we synthesized two series of carbon spheres with the main difference is with or without N-doping. It is found that the storage of potassium ions is mainly determined by the crystal structure instead of N-doping. N-doping seems to affect the ion diffusion process, but the total capacity is still determined by the (0 0 2) lateral size of the carbon materials ( L a ). The specific capacity increases as L a increases. The N-doped carbon sphere with larger L a of 8.32 nm, delivers a higher reversible capacity of 241 mAh g −1 at a current density of 25 mA g −1 . And it still remains 121 mAh g −1 after 100 cycles at a current density of 100 mA g −1 .
研究领域:
材料科学
·
电化学
·
能源存储
·
纳米材料
·
碳材料
✓ 已验证
DOI
高影响因子
RARE METALS
·
2023
·Vol. 42
·期 10
·3387-3398
·
IF 8.8
Dai Jing,Jing Jian,Yang Jian-Ping,Zhang Wen,Liu Shao-Xiong,Wang Qian-Fu,Wen Jia-Xing,Hu Hai,Li Hui-Fang,Liu Li
Na superionic conductor (NASICON)-type La 0.33 Ti 2 (PO 4 ) 3 (LaTP) is firstly proposed as sodium/potassium storage materials. The density functional theory (DFT) calculations show that LaTP has good electronic character and low Na + /K + migration barriers. The flexible La 0.33 Ti 2 (PO 4 ) 3 /C nanofiber film is synthesized via electrostatic spinning and investigated as free-standing electrode applied to sodium-ion batteries (SIBs) and potassium-ion batteries (PIBs) in this work. The low band gap and Na + /K + migration barriers of LaTP, unique morphology, and complete conductive carbon net allow the La 0.33 Ti 2 (PO 4 ) 3 /C nanofibers film to deliver high capacity (296.3 mAh·g −1 for SIBs and 235.8 mAh·g −1 for PIBs), excellent rate performance (142.5 mAh·g −1 for SIBs and 50.5 mAh·g −1 for PIBs at 1.00 A·g −1 ), and superior cyclability above 1000 cycles. The full-cell tests show that the material has a good application prospect, indicating a promising flexible anode material for SIBs and PIBs. Graphical abstract
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2024
·
IF 8.3
Yinshuang Pang,Qingxue Lai,Haobo Xia,Wanying Zhang,Hong Chen,Ran Chen,Zixia Lin,Jing Zheng
Covalent-organic-framework (COF) materials with a designable periodic framework have been expected as a kind of promising anode material for potassium ion batteries (PIBs). However, these materials suffer seriously from low capacity, poor rate performance, and slow reaction kinetics during the K-storage process, significantly limiting their widespread applications. Herein, a three-dimensional (3D) COF material denoted as CN-COF with a high N content and defined configuration as well as a graphite-like layer stacking structure was developed as a promising anode to realize efficient 3D K-storage performance with enhanced interfacial stability and reaction kinetics via an electrolyte chemistry compatibility strategy. Particularly, a uniform and stable solid-electrolyte interphase (SEI) with rich inorganic components was controllably formed in the optimized high-concentration THF-based electrolyte (HTE), ensuring satisfactory cycling stability as well as rapid diffusion kinetics. As a result, the synthesized CN-COF material in this optimized electrolyte delivered a high reversible capacity of 385.8 mAh/g at 50 mA/g, and a well-maintained 95.3 mAh/g after 1500 cycles at 500 mA/g. This work provides innovative design and manipulation of the K-storage mechanism via the synergistic effect between nanostructure design and electrolyte chemistry for advanced K-storage materials.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Inorganic Chemistry Frontiers
·
2024
·
IF 6.1
Guo-Guo Zhang,Pengtao Qiu,Jia-Xin Kang,Zhiwei Lu,An-Qi Zhu,Xiaohu Yu,Xuenian Chen
Solid-state potassium metal batteries have increasingly gained attention as promising alternatives in large-scale energy storage due to their safety and low cost. However, these batteries usually suffer from a lack of suitable K+ conducting solid electrolytes. Herein, a new KB11H14·2Me3NBH3 complex electrolyte with high ionic conductivity and relative stability against K metal is reported. The crystal structure was solved as a monoclinic P21/c lattice. Density functional theory (DFT) calculations confirm significantly enhanced K-ion diffusion in the structure. High K-ion conductivities of 2.63 × 10−6 S cm−1 at 25 °C and 3.25 × 10−4 S cm−1 at 75 °C are achieved, putting it among the leading K+ solid conductors. Moreover, it shows favorable interfacial stability against the K metal anode precoated with NH3B3H7. Batteries coupling the TiS2 cathode deliver long-term cycling stability. This work provides a new group of K-ion solid-state electrolytes for safe potassium metal batteries.
研究领域:
材料科学
·
电化学
·
能源存储
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）