THERMOCHIMICA ACTA
·
2012
·
IF 1.805
Yang Lu,Juan Han,Chengzhuo Sheng,Ping Yu,Zhenjiang Tan,Yongsheng Yan
The phase diagrams for the systems containing polyoxyethylene (10) lauryl ether (POELE10) and three salts (KOH, K 2 CO 3 and K 3 PO 4 ) have been determined experimentally. Three experiential equations were used to correlate the binodal data. The liquid–liquid equilibrium data of these systems were obtained by experimental method and calculated method using lever rule. The tie-line data were correlated by using Othmer-Tobias and Bancroft and simple Setschenow-type equations. Furthermore, the effect of salt on the binodal curve for the studied systems has been discussed by means of salting-out coefficient, effective excluded volume (EEV) and Gibbs free energy of hydration of the ions (Δ G hyd ). It was found that the salts composed of anion with a higher valence are better salting-out agents than those with a lower valence. The order of salting-out abilities of salts is K 3 PO 4 > K 2 CO 4 > KOH for the investigated systems. Finally, the phase-separation ability of POELE10 is more powerful compared with that of other polymers and two-phase can easily form at the lower concentration, which indicates that lower cost is a remarkable advantage of POELE10–salt ATPSs.
研究领域:
化学
·
生物学
✓ 已验证
DOI
高影响因子
Processes
·
2022
·Vol. 10
·期 5
·823
·
IF 3.352
Bin Li,Xinjun Jing,Junsheng Yuan
The phase equilibria of the reciprocal quaternary system LiBr-Li2SO4-KBr-K2SO4-H2O and its ternary sub-systems LiBr-Li2SO4-H2O and KBr-K2SO4-H2O at 308.15 K were studied using the isothermal dissolution equilibrium method. Then, the solubility data of the equilibrium solutions were collected, and the phase diagrams were plotted. The phase diagrams of the ternary sub-systems at 308.15 K were compared with those at other temperatures. This study found that the phase diagram of the LiBr-Li2SO4-H2O system at 308.15 K consisted of an invariant point, two solid-phase crystallization regions of Li2SO4·H2O and LiBr·2H2O, and their corresponding solubility curves. The system generated two hydrated salts, which belonged to the hydrate type I phase diagram. The phase diagram of the KBr-K2SO4-H2O system at 308.15 K consisted of an invariant point, two univariant solubility curves, and two solid-phase crystallization regions of KBr and K2SO4, and no solid solution and double salts were formed. Thus, it belonged to a simple co-saturation type phase diagram. In the LiBr-Li2SO4-KBr-K2SO4-H2O system, K2SO4·Li2SO4double salt formed at 308.15 K, and the phase diagram consisted of three invariant points, five crystallization regions, and seven univariant solubility curves.Keywords:lithium bromide;potassium bromide;lithium sulfate;potassium sulfate;phase equilibrium
研究领域:
化学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2021
·
IF 2.694
Fei Yuan,Hua Li,Long Li,Yafei Guo,Shiqiang Wang,Tianlong Deng
Considering the significance of fundamental phase equilibrium data in resource exploitation from salt lake brines, the solid–liquid phase equilibria of the ternary system (KBO2 + K2SO4 + H2O) at 288.15, 308.15 K, and 0.1 MPa were investigated using the isothermal dissolution method. Along this line, the solubilities and physicochemical properties of densities were experimentally determined. Based on the experimental data, phase diagrams and the related physicochemical property diagrams against composition were plotted. It was found that there are one invariant point, two univariate solubility curves, and two crystalline regions corresponding to potassium metaborate hydrate (KBO2·1.33H2O) and arcanite (K2SO4) in the ternary phase diagrams at 288.15 and 308.15 K. In addition, they belong to the hydrate type I and neither double salt nor solid solution was formed. The distributive behaviors of density against the concentration of KBO2 in the equilibrium solution at two temperatures were similar. Moreover, the theoretical values of density were calculated, which were found to be consistent with the experimental values, further demonstrating the accuracy and reliability of this work.
研究领域:
化学
·
物理化学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry A
·
2024
·Vol. 12
·期 48
·33958-33971
·
IF 10.7
Danni Du,Qingyuan Liu,Jing Gao,Yuying Qin,Xiaobo Jiang,Yuanchang Shi,Minghao Hua,Xiaohang Lin,Zhiwei Zhang,Chengxiang Wang,Longwei Yin,Rutao Wang
Pre-potassiation technologies, which serve to provide additional potassium sources and/or mitigate potassium loss during cycling, are capable of enhancing the energy density and cycling life of potassium-ion capacitors (PICs) and potassium-ion batteries (PIBs). However, many reported pre-potassiation strategies involve using highly chemically reactive potassium sources, such as metallic potassium or K-containing additives, which increase both the cost and production risks. Herein, we propose a novel potassium-ion compensation strategy to meet the demand for high-performance potassium-ion full cells without using any high chemical reactivity potassium sources. This strategy is based on the foundation that a pre-lithiation carbon anode with a preformed solid-electrolyte-interphase (SEI) layer can effectively mitigate potassium loss without hindering the K+ diffusion from the electrolyte to the electrode during cell operation. PICs based on pre-lithiation carbon anodes, including soft carbon, hard carbon, and graphite, show better capacitive performance than those based on pre-potassiation carbon counterparts. This versatile strategy is also applicable to high-performance PIBs. We believe that this design principle, which incorporates mature pre-lithiation technologies into potassium-ion energy storage systems, has the potential to resolve some of the challenges with immature pre-potassium technologies.
研究领域:
材料科学
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能源存储技术
✓ 已验证
DOI
高影响因子
Nanoscale
·
2021
·Vol. 13
·期 13
·6635-6643
·
IF 7.79
Die Su,Jing Dai,Min Yang,Jiaxing Wen,Jianping Yang,Wen Liu,Hai Hu,Li Liu,Yan Feng
TiO2-red phosphorus/C nanofibers (TiO2-RP/CN) have been synthesized via electrospinning and then annealed with red phosphorus sublimation. Benefiting from the high electronic/ionic conductivity and robust stability of the unique structure, the TiO2-RP/CN show high reversible capacities, as well as an outstanding cycling ability. In K half cells, the capacity decay of the TiO2-RP/CN electrode mainly occurs in the first few cycles, and at 0.05 A g−1 it delivers a high specific capacity of 257.8 mA h g−1 after 500 cycles. K full cells were fabricated; these are well-matched with PTCDA (perylene-3,4,9,10-tetracarboxylic dianhydride) and also exhibited a good electrochemical performance (62 mA h g−1 after 100 cycles). Therefore, the TiO2-RP/CN are potential anode materials for use in K-ion batteries.
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 Energy Chemistry
·
2020
·
IF 7.216
Hao-Jie Liang,Zhen-Yi Gu,Xue-Ying Zheng,Wen-Hao Li,Ling-Yun Zhu,Zhong-Hui Sun,Yun-Feng Meng,Hai-Yue Yu,Xian-Kun Hou,Xing-Long Wu
Graphite as a promising anode candidate of K-ion batteries (KIBs) has been increasingly studied currently, but corresponding rate performance and cycling stability are usually inferior to amorphous carbon materials. To protect the layer structure and further boost performance, tempura-like carbon/carbon nanocomposite of graphite@pitch-derived S-doped carbon (G@PSC) is designed and prepared by a facile and low-temperature modified molten salt method. This robust encapsulation structure makes their respective advantages complementary to each other, showing mutual promotion of electrochemical performances caused by synergy effect. As a result, the G@PSC electrode is applied in KIBs, delivering impressive rate capabilities (465, 408, 370, 332, 290, and 227 mA h g −1 at 0.05, 0.2, 0.5, 1, 2, and 5 A g −1 ) and ultralong cyclic stability (163 mA g −1 remaining even after 8000 cycles at 2 A g −1 ). On basis of ex-situ studies, the sectionalized K-storage mechanism with adsorption (pseudocapacitance caused by S doping)-intercalation (pitch-derived carbon and graphite) pattern is revealed. Moreover, the exact insights into remarkable rate performances are taken by electrochemical kinetics tests and density functional theory calculation. In a word, this study adopts a facile method to synthesize high-performance carbon/carbon nanocomposite and is of practical significance for development of carbonaceous anode in KIBs.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
ACS Applied Energy Materials
·
2022
·
IF 6.959
Xusheng Dong,Ruizheng Zhao,Haoxiang Di,Boya Wang,Guangzhen Zhao,Tingting Gao,Huapeng Li,Bin Sun,Dongliang Chao,Guowei Zhou
Carbonaceous materials are promising potassium-ion battery (PIB) anodes because of their merits of low cost and potentially porous structure. Unfortunately, sluggish kinetics of carbonaceous materials with limited active sites result in unsatisfactory cycling stability and poor rate performance. Herein, high active nitrogen sites are regulated through the additional phosphorus doping in 2D nitrogen-rich porous ultrathin carbon scrolls (P-N/UCS), realizing stable and high-rate potassium storage. Moreover, the P-N/UCS anode affords expanded interlayer distance and enhanced conductive networks with abundant pore structures and defects, which further accelerate charge transfer and K+ diffusion kinetics. Meanwhile, the P-N/UCS anode reveals a large specific surface area and high active N sites, which can expose additional open active sites to boost interfacial K+ adsorption reactions. Theoretical calculations further certify that the P-N/UCS anode can effectively enhance the adsorption capability of K+; thus, potassium storage performance is promoted. As a proof of concept, the as-prepared P-N/UCS anode exhibits a high specific capacity of 382.8 mAh g–1 after 500 cycles at 0.1 A g–1 and long cycle stability of 265.8 mAh g–1 after 2000 cycles at 1.0 A g–1. This work paves an avenue for the further controllable large-scale exploration of high-performance potassium storage anodes.
研究领域:
材料科学
·
能源存储
✓ 已验证
产品关联
DOI
高影响因子
Journal of Energy Chemistry
·
2024
·
IF 14
Xinhai Wang,Wensheng Yang,Shengshang Lu,Shangshu Peng,Tong Guo,Quan Xie,Qingquan Xiao,Yunjun Ruan
Aqueous potassium-ion batteries (APIBs), recognized as safe and reliable new energy devices, are considered as one of the alternatives to traditional batteries. Layered MnO 2 , serving as the main cathode, exhibits a lower specific capacity in aqueous electrolytes compared to organic systems and operates through a different reaction mechanism. The application of highly conductive graphene may effectively enhance the capacity of APIBs but could complicate the potassium storage environment. In this study, a MnO 2 cathode pre-intercalated with K + ions and grown on graphene (KMO@rGO) was developed using the microwave hydrothermal method for APIBs. KMO@rGO achieved a specific capacity of 90 mA h g −1 at a current density of 0.1 A g −1 , maintaining a capacity retention rate of >90% after 5000 cycles at 5 A g −1 . In-situ and ex-situ characterization techniques revealed the energy-storage mechanism of KMO@rGO: layered MnO 2 traps a large amount of “dead” water molecules during K + ions removal. However, the introduction of graphene enables these water molecules to escape during K + ions insertion at the cathode. The galvanostatic intermittent titration technique and density functional theory confirmed that KMO@rGO has a higher K + ions migration rate than MnO 2 . Therefore, the capacity of this cathode depends on the interaction between dead water and K + ions during the energy-storage reaction. The optimal structural alignment between layered MnO 2 and graphene allows electrons to easily flow into the external circuit. Rapid charge compensation forces numerous low-solvent K + ions to displace interlayer dead water, enhancing the capacity. This unique reaction mechanism is unprecedented in other aqueous battery studies.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2023
·
IF 9.9
Zecheng Yang,Liluo Shi,Hao Wang,Jianzhen Xiong,Xuena Xu,Limei Sun,Jiangmin Jiang,Quanchao Zhuang,Yaxin Chen,Zhicheng Ju
Carbon nanosheets (CNS) have garnered significant interest as anode materials for potassium-ion batteries (PIBs) due to the excellent potassium storage kinetics and rate performance. Moreover, tuning the thickness of CNS can enhance the potassium storage performance by exposing abundant surface active sites and shortening the K + migration path. Herein, crystallization-induced thickness tuning of carbon nanosheets in polyvinyl pyrrolidone-potassium chloride (PVP-KCl) solution is reported to enhance the fast potassium storage. PVP with varying molecular weights is employed to induce the crystallization behavior of KCl, leading to the formation of KCl grains with controllable sizes. Concurrently, these KCl grains act as hard templates for dispersing the PVP molecules to fabricate carbon nanosheets on the surface during annealing. PVP with high molecular weight is beneficial for hindering ion migration to reduce crystal sizes, which can decrease the thickness of carbon nanosheets. The ultrathin structure exposes abundant potassium storage sites, endowing CNS with high reversible capacity (359.0 mAh/g at 100 mA/g). The reduction in the migration path of K + ions facilitate rapid ion and electron transport kinetics, resulting in rate performance with a capacity of 181.9 mAh/g at 1 A/g. Our work extends the application of the crystallization-induced strategy for controllable designing carbon nanosheets, and puts forward some conceptions on improving the potassium storage performance of carbon anode materials.
研究领域:
材料科学
·
电化学
·
纳米能源
·
储能技术
·
碳材料
·
电池材料
✓ 已验证
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2024
·
IF 9.4
Ting Wang,Weifang Zhao,Ran Ren,Huilin Lan,Tengfei Zhou,Juncheng Hu,Qingqing Jiang
Exploring robust electrode materials which could permit fast and reversible insertion/extraction of large K + is a crucial challenge for potassium-ion batteries (PIBs). Smart interfacial design could facilitate electron/ion transport as well as assure the integrity of electrode. Herein, Cetyltrimethylammonium bromide (CTAB) was found to play bifunctional roles in construction of Nb 2 CT x @MoSe 2 heterostructure. Firstly, functionalization of CTAB on the surface of Nb 2 CT x could influence the subsequent growth of MoSe 2 by electrostatic effect, stereochemical effect and the synergetic Lewis acid-base interaction, leading to the formation of Nb 2 CT x @MoSe 2 with tiled heterostructure. Secondly, the interlayer spacing of Nb 2 CT x was expanded from 0.77 to 1.21 nm owing to the pillar effect of CTAB. As excepted, the capacity retention was 80 % from 100 mA g −1 (406 mA h g −1 ) to 1000 mA g −1 concerning rate capability and the specific capacity maintained at 240 mA h g −1 (at 2000 mA g −1 ) over 300 cycles. The calculated D K values from Galvanostatic intermittent titration technique (GITT) measurement of the titled C-T-Nb 2 CT x @MoSe 2 @C electrode is two orders of magnitude larger than the traditional T-Nb 2 CT x @MoSe 2 @C electrode, further confirming intimate interface between MoSe 2 and Nb 2 CT x could provide convenient potassium-ion transport channels and fast diffusion kinetics. Finally, ex-situ characterizations at different charging and discharging voltage stages, including ex-situ XRD/Raman/HRTEM/XPS have been carried out to reveal the potassium storage mechanism. This work provides a facile strategy for the regulation of interface engineering by the assist of CTAB which could extend to other MXenes-TMDs (Transition metal dichalcogenides) hybrid electrodes.
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
ChemElectroChem
·
2019
·Vol. 6
·期 8
·2308-2315
·
IF 3.975
Cai-ling Liu,Shao-hua Luo,Hong-bo Huang,Yu-chun Zhai,Zhao-wen Wang
Graphical Deficiency not insuffciency : Potassium-deficient layered P3-K 0.45 Mn 0.9 Mg 0.1 O 2 is prepared through a simple solid-state reaction and investigated as a cathode material for K-ion batteries. It exhibits excellent electrochemical performance. Novel, potassium-deficient, layered P3-K 0.45 Mn 0.9 Mg 0.1 O 2 is successfully prepared through a simple solid-state reaction method; its electrochemical performance as a cathode material for K-ion batteries is explored for the first time. The as-prepared K 0.45 Mn 0.9 Mg 0.1 O 2 delivers a high reversible capacity of 108 mAh g −1 at a current density of 20 mA g −1 in the potential region from 1.5 to 4.0 V. Moreover, the cyclability is enhanced by Mg substitution. After 100 cycles, the capacity of K 0.45 Mn 0.9 Mg 0.1 O 2 can remain at about 80.8 mAh g −1 at 20 mA g −1 . It also presents an excellent rate performance of 69.8 mAh g −1 even at a high current density of 200 mA g −1 . Furthermore, the potassium storage mechanism is studied by using the ex situ XRD technique. These results contribute to the development of rechargeable K-ion batteries based on earth-abundant elements.
研究领域:
材料科学
·
能源存储
✓ 已验证
DOI
高影响因子
CARBON
·
2018
·
IF 7.082
Xiujun Qi,Kangsheng Huang,Xuan Wu,Wei Zhao,Hong Wang,Quanchao Zhuang,Zhicheng Ju
Potassium-ion batteries (PIBs) are an emerging energy storage technology for low cost and large scale applications. However, due to the larger K ions it suffers insufficient cycle life and poor rate capability. In this paper, these problems are surmounted by using N-doped porous carbon (NPC) anodes. Excellent electrochemical performance was demonstrated with a high reversible capacity of 296.8 mA h g −1 after 100 cycles at a current density of 50 mA g −1 . The superior performance is mainly ascribed to well-defined pore structure and high nitrogen content. The unique porous structure can effectively alleviate the volume expansion induced by the insertion of large K ions. Moreover, nitrogen doping can generate different types of defects and vacancies, thereby providing more electroactive sites. Given the abundance and universal distribution of potassium in the Earth's crust, the encouraging results make NPC a promising candidate for KIBs anodes.
研究领域:
材料科学
·
能源存储技术
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）