Nano Energy
·
2020
·
IF 16.602
Na Zhao,Jian Qin,Lujia Chu,Linzhe Wang,Dan Xu,Xiujuan Wang,Huijuan Yang,Jiujun Zhang,XiFei Li
The development of potassium ion batteries is restricted by the intrinsic large ion radius, resulting in dramatic volume change of electrodes and slow faradic reaction in kinetics. High requirements are proposed for the structure design of anodes. In this work, Se coating-Sb nanocrystalls-three dimensional interconnected carbon networks (3D Se@Sb@C) heterogeneous structure was prepared by a low-temperature template-assisted CVD method. The network and sandwich structure can not only shorten the solid-state diffusion path of K + , but also alleviate the volume change of Sb. Moreover, the hetero interface between Se and Sb can form chemical bonding and further generate heterogeneous junctions in electrochemical reactions, providing more electron states at the Fermi energy level and reducing the ionic diffusion barrier of K + . Benefiting from it, the 3D Se@Sb@C electrode possess an optimized energy storage mechanism and exhibits an outstanding rate performance and an ultra-long lifespan of more than 5000 cycles with 87% of capacity retention, which is rarely reported for PIB anodes. It reveals the important role of heterogeneous structure in potassium storage, which can inspire other researchers to achieve superior electrochemical performance by interface engineering for electrode materials.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2021
·
IF 8.742
Rujie Yang,Yan Fan,Risheng Yu,Fangfang Dai,Jian Lan,Zhikun Wang,Junlang Chen,Liang Chen
Graphene oxide (GO) lamellar membranes exhibit great potential for application in molecular separation. However, they are still limited by low water permeation and swelling effects. Here, we develop robust K + -crosslinked reduced GO (rGO–K + ) membranes for treating wastewater containing multivalent heavy metal ions. The rGO–K + membranes demonstrated a water permeance of 86.1 L m −2 h −1 bar −1 and a rejection rate of 99.8% for FeCl 3 , which exceed the corresponding values of state-of-the-art nanofiltration (NF) membranes for multivalent metal ion rejection. Further, the rGO–K + membranes exhibited excellent aqueous stability under a high pressure (up to 9 bar) and acidic, neutral, and alkaline conditions. The improved permeability of the rGO–K + membranes was attributed to the cation–π interactions between K + and the rGO sheets, which fixed and enlarged the interlayer spacing, as well as increased the surface hydrophilicity, thus weakening the water transport resistance. The intercalated K + linked the adjacent layers through the cation–π interactions, which enhanced the membrane stability. The prepared rGO–K + membranes have potential for use in membrane separation in industrial applications.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
Nanoscale
·
2021
·Vol. 13
·期 23
·10385-10392
·
IF 7.79
Xiuping Sun,Suyuan Zeng,Ruxia Man,Lu Wang,Bo Zhang,Fang Tian,Yitai Qian,Liqiang Xu
Transition metal selenides (TMSs) are suitable for SIBs and PIBs owing to their satisfactory theoretical capacity and superior electrical conductivity. However, the large radius of Na+/K+ easily leads to sluggish kinetics and poor conductivity, which hinder the development of SIBs and PIBs. Structure design is an effective method to solve these obstacles. In this study, Co2+ ions combined with glycerol molecules to form self-assembled nanospheres at first, and then they were in situ converted into CoSe2 nanoparticles embedded in a carbon matrix during the selenization process. This structure has three-dimensional ion diffusion channels that can effectively hamper the aggregation of metal compound nanoparticles. Meanwhile, the CoSe2/C of the yolk–shell structure and a large number of pores help alleviate volume expansion and facilitate electrolyte wettability. These structural advantages of CoSe2/C endow it with remarkable electrochemical performances for full/half SIBs and full/half PIBs. The obtained CoSe2/C exhibits superior stability and excellent performance (312.1 mA h g−1 at 4 A g−1 after 1600 cycles) for SIBs. When it is used as an anode material for PIBs, 369.2 mA h g−1 can be retained after 200 cycles at 50 mA g−1 and 248.1 mA h g−1 can be retained after 200 cycles at 500 mA g−1; in addition, CoSe2/C also shows superior rate capacity (186.4 mA h g−1 at 1000 mA g−1). A series of ex situ XRD measurements were adapted to explore the possible conversion mechanism of CoSe2/C as the anode for PIBs. It is worth noting that the full-cell of CoSe2/C//Na3V2(PO4)3@rGO for SIBs and the full-cell of CoSe2/C//PTCDA-450 for PIBs were successfully assembled. The relationship between the structure and performance of CoSe2/C was investigated through density functional theory (DFT).
研究领域:
材料科学
·
电化学
·
能源存储
✓ 已验证
DOI
高影响因子
JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2012
·
IF 1.693
Yang Lu,Juan Han,Zhenjiang Tan,Yongsheng Yan
The binodal curves of the aqueous two-phase system (ATPS) containing the polyoxyethylene (10) lauryl ether (POELE10, C32H66O11) and three potassium salts (KOH/K2CO3/K3PO4) were determined at the temperatures (288.15, 293.15, 303.15, and 308.15) K. The three experience equations were used to fit the binodal data for the studied systems, and a satisfactory correlation effect was obtained. The effect of salts on the binodal curves for the investigated systems was discussed by the effective excluded volume (EEV), and we found that the salting-out effect is mainly influenced by valence of anion of salts. The salt containing the higher valence of anion has a stronger phase-forming ability than that with a lower charge of anion. The liquid–liquid equilibrium (LLE) data for the investigated systems were determined and correlated by the Othmer–Tobias and Bancroft equations. The effect of the change of temperature on the binodal curves and tie-lines was also studied through the analysis of the EEV values and cloud point (CP) figure. The increase in temperature leads to the strengthening hydrophobicity of POELE10 that drive more water transferring from the top phase to the bottom phase, which means the phase-forming ability of the whole systems was strengthened. Thus, the critical concentration of POELE10 and salts for forming ATPS decreases with the rising temperature.
研究领域:
化学工程
·
生物技术
✓ 已验证
DOI
高影响因子
Small
·
2022
·Vol. 18
·期 39
·2203459
·
IF 15.153
Qing Sun,Maoxiang Yang,Guifang Zeng,Jing Li,Zhibiao Hu,Deping Li,Shang Wang,Pengchao Si,Yanhong Tian,Lijie Ci
Tin chalcogenides are regarded as promising anode materials for potassium ion batteries (PIBs) due to their considerable specific capacity. However, the severe volume effect, limited electronic conductivity, and the shuttle effect of the potassiation product restrict the application prospect. Herein, based on the metal evaporation reaction, a facile structural engineering strategy for yolk–shell SnSe encapsulated in carbon shell (SnSe@C) is proposed. The internal void can accommodate the volume change of the SnSe core and the carbon shell can enhance the electronic conductivity. Combining qualitative and quantitative electrochemical analyses, the distinguished electrochemical performance of SnSe@C anode is attributed to the contribution of enhanced capacitive behavior. Additionally, first-principles calculations elucidate that the heteroatomic doped carbon exhibits a preferable affinity toward potassium ions and the potassiation product K 2 Se, boosting the rate performance and capacity retention consequently. Furthermore, the phase evolution of SnSe@C electrode during the potassiation/depotassiation process is clarified by in situ X-ray diffraction characterization, and the crystal transition from the SnSe Pnma(62) to Cmcm(63) point group is discovered unpredictably. This work demonstrates a pragmatic avenue to tailor the SnSe@C anode via a facile structural engineering strategy and chemical regulation, providing substantial clarification for the phase evolution mechanism of SnSe-based anode for PIBs.
研究领域:
材料科学
·
能源存储与转换
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry A
·
2019
·Vol. 7
·期 10
·5666-5676
·
IF 10.733
Xuewen Yin,Jianhua Han,Yu Zhou,Youchen Gu,Meiqian Tai,Hui Nan,Yangying Zhou,Jianbao Li,Hong Lin
NiO is a well-known hole transporting material (HTM) for hysteresis-free inverted perovskite solar cells (PSCs) due to its wide optical bandgap resulting in low absorption losses, and its high conduction band edge resulting in an efficient electron blocking effect. Nevertheless, the photovoltaic performance of PSCs based on solution-processed NiO is still not pleasing owing to their relatively low short-circuit current density (Jsc) or fill factor (FF), which originates from the relatively low conductivity of NiO and the enormous difference in the mobility of the electron transporting layer (ETL) fullerene and hole transporting layer (HTL) NiO. In this work, K is firstly introduced into NiO to improve its conductivity, carrier extraction capacity and mobility, and thus largely improve its Jsc and FF. Consequently, a best PCE of 18.05% based on K-doped NiO is obtained, resulting in an increment of approximately 15% compared with 15.77% of the device based on pure NiO. The improved conductivity and mobility of NiO by extrinsic dopant K are believed to achieve charge-carrier transport balance from the perovskite to the ETL and HTL, which can effectively avoid charge accumulation within the perovskite or at the interface of the perovskite and HTL. Moreover, the partial diffusion of K induced a moderate excess of PbI2, thus forming type II band alignment between PbI2 and the perovskite, which can passivate the surface or grain boundaries of the perovskite. This work demonstrates that K-doped NiO is a promising HTM for highly efficient inverted PSCs. Meanwhile, this article illustrates a novel defect-passivation mechanism by diffusion.
研究领域:
材料科学
·
能源科学
✓ 已验证
DOI
高影响因子
Journal of Energy Chemistry
·
2022
·
IF 13.599
Liping Duan,Jianzhi Xu,Yifan Xu,Ruiqi Tian,Yingying Sun,Chuannan Zhu,Xiangyin Mo,Xiaosi Zhou
Potassium ion batteries (PIBs) are emerging as potential next-generation energy storage systems on account of their low cost and high theoretical energy density. Nevertheless, they also face challenges of low specific capacity and suboptimal cycling stability. Herein, we synthesize a cocoon-like P3-type K 0.5 Mn 0.7 Ni 0.3 O 2 (KMNO) cathode material by a self-template method. The KMNO cocoons possess a hierarchical layered architecture composed of nanoparticle stacking, which can accelerate the transport kinetics of potassium ions, mitigate the stress caused by K + intercalation and deintercalation, and improve structural stability. In addition, Ni can not only alleviate the Jahn-Teller distortion and suppress the phase transition to stabilize the structure, but also act as an electrochemically active element, providing the capacity of two electrons from Ni 2+ to Ni 4+ . Combining the advantages of structure and nickel substitution, the P3-type KMNO cocoons are used for electrochemical performance testing of PIB cathodes, delivering an excellent rate capability of 57.1 mA h g −1 at 500 mA g −1 and a remarkable cycling stability of 77.0% over 300 cycles at 100 mA g −1 . Impressively, the KMNO cocoons//pitch-derived soft carbon assembled full battery exhibits superior electrochemical performance with a reversible capacity of 79.7 mA h g −1 at 50 mA g −1 . Moreover, ex-situ XRD also further reveals a solid solution phase reaction with a volume change of only 1.46%. This work furnishes a suitable approach to fabricating high-performance layered oxide cathodes for PIBs with outstanding cycling stability and rate capability.
研究领域:
材料科学
·
能源存储技术
✓ 已验证
DOI
高影响因子
Journal of Energy Chemistry
·
2021
·
IF 9.676
Lin Li,Zhe Hu,Yong Lu,Shuo Zhao,Qiu Zhang,Qiannan Liu,Zhenhua Yan,Shu-Lei Chou
Metal phosphides have shown great potential for potassium-ion batteries because of their high theoretical specific capacity. Nevertheless, most of the metal phosphide anodes are plagued by rapid capacity decay (caused by the large volume changes during the discharge/charge process), which would restrict their further practical application. Herein, a chemically bonded CuP 2 /C composite was prepared by a facile high-energy ball milling method. A potassium bis(trifluoromethanesulfonyl)imide (KFSI)-based electrolyte was adopted instead of a conventional KPF 6 -based electrolyte for the CuP 2 /C composite anode. Benefiting from the synergistic effects of the formation of strong P–O–C chemical bonds and the KFSI-based electrolyte, the CuP 2 /C composite anode exhibited high reversible capacity (451.4 mAh g −1 at 50 mA g −1 ), excellent rate performance (123.5 mAh g −1 at 1000 mA g −1 ), and superior cycling stability (300 mAh g −1 after 100 cycles). This work paves the way for the development of high-performance CuP 2 anode for potassium-ion batteries.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
ACS Applied Energy Materials
·
2024
·
IF 5.4
Mengsi Li,Chenyang Chen,Jiaqi Yang,Zifei Wu,Jiale Xia,Yuanyuan Li,Jinping Liu
Sodium-ion capacitors (SICs), consisting of a high-rate capacitive cathode and a high-capacity battery-type anode, are considered as one of the most promising energy storage devices due to their high energy/power densities as well as abundant sodium resources. However, the relatively low capacitance of the conventional carbon-based cathode materials significantly limits the energy density update of SICs. Herein, we develop a platelike jarosite (KFe3(SO4)2(OH)6) with large pseudocapacitance as the cathode for constructing high-energy-density SICs. The open channels formed by the linked FeO4(OH)2 octahedra and SO4 tetrahedra in the layered hexagonal crystal structure of KFe3(SO4)2(OH)6 provide rapid ion diffusion pathways, thus enabling pseudocapacitive-dominant charge storage of KFe3(SO4)2(OH)6. A self-supporting KFe3(SO4)2(OH)6 cathode with a three-dimensional electronically conductive architecture is designed, exhibiting high reversible capacities, excellent cycling stability, and superior rate performance. Additionally, the SIC assembled using the pseudocapacitive KFe3(SO4)2(OH)6 cathode and Na2Ti3O7 battery anode delivers a maximum energy density of 123.3 Wh kg–1 and a maximum power density of 3625.9 W kg–1 (still with an energy density of 51.2 Wh kg–1 at this high power density). This work unveils the great potential of the jarosite family to serve as a type of high-performing intercalation pseudocapacitive cathode material for next-generation sodium-ion storage devices.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2022
·
IF 7.968
Liangmin Xiong,Shuang Liu,Yong Men,Lin Li,Xiaoda Niu,Kailiang Guo,Junzhe Xu,Wei An,Jinguo Wang,Yu Cong
CO 2 hydrogenation to liquid fuels is significant to reduce CO 2 emissions and replace fossil fuels . Herein, we reported that Fe catalysts promoted by combination of K and Pd showed a three-synergistic catalytic effect to high selectivity of C 5+ hydrocarbons in CO 2 hydrogenation reaction. The catalysts were prepared using an impregnation method and characterized with physical adsorption , XRD , XPS , HRTEM , H 2 -TPR, H 2 -TPD and CO 2 -TPD. The results indicated that K 0.016 Pd 0.12 Fe catalysts showed K-overlapped PdFe-like alloy structure which enhanced H 2 activation behaviors and moderately chemisorption of CO 2 . K addition promoted Fe to activate carbide species while active H originated from H 2 pool generated by PdFe alloy spilled to Fe species surface, consequently boosting not only conversion of CO 2 to 41.8% but also selectivity of C 5+ hydrocarbon to 70.6%. The maximum yield of long-chain C 5+ hydrocarbon reached up to 20.0% under high space velocity 6000 mL g cat −1 h −1 . These results provide a new insight to develop highly selective Fe based catalysts for long-chain hydrocarbons via CO 2 hydrogenation.
研究领域:
化学工程
·
催化反应
·
能源转化
✓ 已验证
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2024
·
IF 4.9
Xiaoyu Chen,Chenlong Hao,Mengyao Shang,Xiangxin Li,Shuo Wang,Wenming Zhang
Manganese based oxides have significant potential as cathode materials for potassium ion batteries (PIB). Unfortunately, the practical application of manganese-based oxides is hindered by severe electrode surface erosion from electrolyte decomposition products and material expansion and collapse during potassium ion intercalation. Consequently, the surface modification strategy is adopted herein to uniformly cover the surface of K 0.27 MnO 2 ·0.54 H 2 O (KMO) microspheres with LiF/Li x PF y O z coating to effectively protect the electrode surface and significantly inhibit the collapse of the material crystal structure. Additionally, the coating exhibits excellent electron/ion conductivity, enhancing the diffusion efficiency of potassium ions within the electrode material. The existence of LiF/Li x PF y O z coating is confirmed by characterization measurements. The LiF/Li x PF y O z -coated KMO microspheres (sample LLO@KMO-2) exhibit outstanding cyclic stability (66.3 % capacity retention at 50 mA g −1 ) and high discharge capacity (100.2 mAh g −1 at 50 mA g −1 ), demonstrating their excellent cycle stability. The modification strategy of LiPF 6 -electrolyte-solvothermal coating provides an innovative surface modification method for potassium ion batteries , showcasing its potential for application in future high-performance battery technologies.
研究领域:
材料科学
·
电化学
·
能源存储
·
电池技术
✓ 已验证
DOI
高影响因子
CHEMICAL PAPERS
·
2016
·Vol. 70
·期 11
·1471-1478
·
IF 1.326
Wei-You Zhou,Yong Chen,Yu-Fa Feng,Ming-Yang He,Qun Chen
Alumina-supported potassium (K/Al 2 O 3 ) catalysts using pseudo-boehmite as the precursor were prepared by the impregnation/calcination method, characterised by XRD, SEM, ICP, N 2 adsorption/desorption, CO 2 -TPD methods and TG analysis, and applied to the vapour-phase condensation of methyl propionate with trioxane to produce methyl methacrylate. The results showed the catalysts’ properties to be mainly affected by the calcined temperature ( T C ) and the crystal structure. The sample calcined at 1100°C exhibited the highest catalytic activity when mixed phases were formed and provided the appropriate specific surface area ( S BET ) and surface basic properties. The effects of T C , K-loading and reaction conditions on the catalytic performance were also investigated in a fixed-bed reactor. The yield of methyl methacrylate attained 29.2 % under the optimised conditions, and the deactivated catalyst could be completely regenerated by calcination.
研究领域:
化学工程
·
催化科学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）