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
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DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Alaaddin M.M. Saeed,Gui-Ping Cao,Mustapha Sani Shehu,Ahmed S. Al-Fatesh,Salwa B. Alreshaidan,Tahani Saad Algarni,Hui Lv,Xin-Yi He,Chun-Xue Wang,Shao-Kang Qian
Bimetallic catalysts have emerged as promising materials due to their versatile applications in energy conversion, catalysis, sensing, and biomedical fields. In this study, a series of Rh Pt bimetallic nanocatalysts supported on multi-walled carbon nanotubes (RhPt x /MWCNTs) were synthesized for the efficient hydrogenation of K-Resin. Catalysts with varying Rh-to-Pt molar ratios (1:1 to 1:5) exhibited superior catalytic activity compared to their monometallic counterparts. Structural and surface analyses using X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS) confirmed the formation of a face-centred cubic structure and demonstrated electronic interactions between Rh and Pt through binding energy shifts. High-resolution transmission electron microscopy (HRTEM) showed well-dispersed RhPtx nanoparticles anchored on the MWCNTs. The catalysts also exhibited mesoporous characteristics and excellent thermal stability. Hydrogenation performance tests revealed that RhPtx/MWCNTs provided high conversion efficiency, stability, and recyclability. The enhanced activity is attributed to improved active site accessibility and reduced diffusion limitations enabled by the porous bimetallic structure. Complete hydrogenation of K-Resin was verified by 1 H NMR, 13 C NMR, and FTIR spectroscopy. Thermogravimetric analysis (TGA) showed that the hydrogenated product (HK-Resin) possesses greater thermal stability than the original K-Resin. Differential scanning calorimetry (DSC) analysis indicated a crystallization enthalpy (ΔHc) of −10.82 J /g, a melting enthalpy (ΔHm) of 7.1 J /g, and a crystallinity of 2.42 %, confirming the improved thermal properties of HK-Resin.
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产品关联
DOI
高影响因子
FLUID PHASE EQUILIBRIA
·
2014
·
IF 2.241
Fuqiong Lei,Qinbo Wang,Xing Gong,Ling Li,Quanbing Wu,Wenming Zhang
Liquid–liquid equilibria (LLE) for the ternary system water + acetic acid + cyclohexanone was studied at (293.2–323.2) K and at atmospheric pressure. The immiscibility region was found to be relatively small and not sensitive to the change of temperature. The Othmer–Tobias equation and the Bachman equation were both used to check the reliability of the obtained experimental tie-line data. The experimental results were correlated with both the NRTL and the UNIQUAC activity coefficient models. The calculated results showed good agreement with the experimentally determined ternary LLE data. The root mean square deviations (RMSD) obtained by comparing the calculated and experimental two-phase compositions are 0.72% for the UNIQUAC model and 0.40% for the NRTL model. The obtained interaction parameters can be used in the calculation of LLE for the ternary system water + acetic acid + cyclohexanone as well as for the design and optimization of the related separation process.
研究领域:
化学工程
·
热力学
·
分离过程
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DOI
高影响因子
JOURNAL OF MOLECULAR LIQUIDS
·
2014
·
IF 2.083
Mengmeng Liang,Yonghong Hu,Xiang Liu,Jun Guan,Wenge Yang,Yan Liu
The solubilities of maleic anhydride in methanol + (acetone, ethyl acetate) mixed solvents were measured within the temperature range of 278.15–323.15 K at atmospheric pressure by the gravimetric method. The solubility of maleic anhydride in those mixed solvents increased with increasing temperature, but the rate of solubility is different. In addition, the solubility of maleic anhydride also increased with the increasing mass fraction of methanol. The experimental data were well-correlated with the modified Apelblat equation, the λh equation and the van't Hoff equation. Moreover, the calculated solubilities shown good agreement with the experimental results. It was found that the modified Apelblat equation could obtain the better correlation results than the other two models. The thermodynamic properties of the solution process, including the enthalpy, and entropy were calculated by the van't Hoff analysis and they were positive. What's more, the experimental data and model parameters would be useful for optimizing the process of purification of maleic anhydride in industry.
研究领域:
化学工程
·
热力学
·
物理化学
·
分离过程
·
工艺优化
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DOI
高影响因子
ChemElectroChem
·
2021
·Vol. 9
·期 2
·e202101351
·
IF 4.59
Gang Ni,Zhao Hao,Guo Yin Zou,Fu Hu Cao,Ling Qin,Cheng Gang Zhou
Graphical An aqueous Zn-based battery with a Berlin green cathode, a K/Zn hybrid electrolyte, and a zinc metal anode are developed. Owing to the rapid insertion and transportation of K ions in the cathode materials and the good compatibility of electrolytes to the metal anode, the hybrid battery delivers improved rate capability and cycle performance. : Aqueous rechargeable zinc-based batteries with the advantages of sustainability, safety, and low cost, are suitable for large-scale electrochemical energy storage applications. In this work, aqueous zinc-based batteries with low defect Berlin green (FeHCF) cathode, a hybrid zinc triflate and potassium triflate electrolyte, and zinc anodes are developed. In the hybrid electrolyte, the K + ions with the weak solvation effect and small electrostatic interaction are the dominant intercalation species in the FeHCF, resulting in the fast charge transfer process and rapid diffusion kinetics. The Zn 2+ ions stay at the surface rather than penetrate into the bulk phase. Thus, the hybrid batteries deliver a high specific capacity of 169.2 mAh g −1 at 100 mA g −1 , excellent rate performance with 45.7 mAh g −1 at 6 A g −1 , and good long-term cyclability with a capacity retention of 57 % over 1000 cycles at 1 A g −1 . The results suggest using aqueous K/Zn hybrid electrolytes can improve the electrochemical performance of FeHCF.
研究领域:
材料科学
·
能源存储
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DOI
高影响因子
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
·
2022
·Vol. 119
·期 23
·e2122252119
·
IF 12.779
Xianlu Lu,Xinfeng Zhang,Yapeng Zheng,Dongdong Zhang,Lan Jiang,Fengmei Gao,Qiao Liu,Dingfa Fu,Jie Teng,Weiyou Yang
Currently, a big problem for exploring K-ion half/full batteries is how to bring them with both high specific capacity and long cycling stability simultaneously, in terms of their intrinsically sluggish kinetics of K+ with larger radius than that of Li+, which often causes huge volume change over the electrochemical reaction. Herein, we report the exploration of high-performance K-ion half/full batteries with superb rate capability and cycle stability based on B-doped porous carbons with increased active sites and improved conductivity. The as-assembled K-ion half cell exhibits an excellent rate capability of 428 mA h g−1 at 100 mA g−1 and a high reversible specific capacity of 330 mA h g−1 with 120% specific capacity retention after 2,000 cycles at 2,000 mA g−1, which is state of the art among those based on carbon materials. Moreover, the as-constructed full cell delivers 98% specific capacity retention over 750 cycles at 500 mA g−1, which is superior to most of the analogs based on carbon materials that have been reported thus far, underscoring their potential applications in advanced energy storage.
研究领域:
材料科学
·
能源存储技术
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DOI
PubMed
高影响因子
Nano Research
·
2021
·Vol. 14
·期 12
·4502-4511
·
IF 8.897
Li Deping,Sun Qing,Zhang Yamin,Dai Xinyue,Ji Fengjun,Li Kaikai,Yuan Qunhui,Liu Xingjun,Ci Lijie
Carbon-based material has been regarded as one of the most promising electrode materials for potassium-ion batteries (PIBs). However, the battery performance based on reported porous carbon electrodes is still unsatisfactory, while the in-depth K-ion storage mechanism remains relatively ambiguous. Herein, we propose a facile “in situ self-template bubbling ” method for synthesizing interlayer-tuned hierarchically porous carbon with different metallic ions, which delivers superior K-ion storage performance, especially the high reversible capacity (360.6 mAh·g −1 @0.05 A·g −1 ), excellent rate capability (158.6 mAh·g −1 @10.0 A·g −1 ) and ultralong high-rate cycling stability (82.8% capacity retention after 2,000 cycles at 5.0 A·g −1 ). Theoretical simulation reveals the correlations between interlayer distance and K-ion diffusion kinetics. Experimentally, deliberately designed consecutive cyclic voltammetry (CV) measurements, ex situ Raman tests, galvanostatic intermittent titration technique (GITT) method decipher the origin of the excellent rate performance by disentangling the synergistic effect of interlayer and pore-structure engineering. Considering the facile preparation strategy, superior electrochemical performance and insightful mechanism investigations, this work may deepen the fundamental understandings of carbon-based PIBs and related energy storage devices like sodium-ion batteries, aluminum-ion batteries, electrochemical capacitors, and dual-ion batteries.
研究领域:
材料科学
·
能源存储
·
电化学
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DOI
高影响因子
Inorganic Chemistry Frontiers
·
2019
·Vol. 7
·期 2
·394-401
·
IF 5.934
Yushan Luo,Mengli Tao,Jianhua Deng,Renming Zhan,Bingshu Guo,Qianru Ma,Muhammad Kashif Aslam,Yuruo Qi,Maowen Xu
K-ion batteries (KIBs) are considered as one of the most promising devices for large-scale energy storage because of the comparable output voltage with lithium-ion batteries and the abundant reserves of potassium. FeS2 is regarded as a kind of very important anode material for KIBs due to its low cost and high capacity. However, the poor electronic conductivity and huge volume expansion of FeS2 during the discharge/charge process strongly inhibit the K-storage performance. To solve these problems, herein, unique core–shell FeS2@C nanocubes with nanoparticles in the interior and carbon shells in the exterior are designed. The inside FeS2 nanoparticles are beneficial for K+ diffusion and the penetration of the electrolyte, while the outside carbon shells can enhance the electronic conductivity and suppress the volume expansion. The unique core–shell structure displays outstanding K-storage performance with impressive specific capacity, excellent cycling stability, and superior rate capability with 73% capacity retention at 2 A g−1. This work not only provides solutions to obtain a superior anode material for KIBs but also offers insights into designing a hierarchical structure for energy storage systems.
研究领域:
材料科学
·
能源化学
·
纳米技术
·
电化学储能
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DOI
高影响因子
Materials Chemistry Frontiers
·
2021
·Vol. 5
·期 6
·2715-2723
·
IF 6.482
Xiaojing Feng,Zhongnan Guo,Xiaoxiao Yan,Jun Deng,Dan Wu,Zijing Zhang,Fan Sun,Wenxia Yuan
Metal phosphorus trichalcogenides (MPX3) are of great interest since these layered materials exhibit wide applications in optical, electrical and magnetic fields. An effective chemical intercalation route for MPX3 which could regulate their physical properties, however, is still lacking. In this work, we show that the liquid ammonia method is an efficient route to co-intercalate alkali metals and NH3 molecules into the gaps in FePS3. After intercalation, the interlayer distance is significantly enlarged by ∼3 Å while the monoclinic lattice (C2/m space group) is still maintained. The structure refinement and EDS measurement suggest that intercalation does not induce any Fe vacancy, thus leading to electron transfer from the alkali metal to [FePS3] layers. Interestingly, magnetic susceptibility shows that the intrinsic anti-ferromagnetic transition in the FePS3 matrix is completely suppressed by this intercalation, whereas a spin-glass state is observed in A(NH3)xFePS3 (A = Li, K) in the lower temperature range (<50 K). The intercalation described in this work is reversible: the alkali metal can be easily de-intercalated using a two-step route and the anti-ferromagnetism reappears accordingly. Meanwhile, the liquid ammonia method is also shown to be efficient at intercalating other MPS3 materials (M = Mn, Co, Ni). Our work not only enriches the intercalation chemistry in the MPX3 system but also provides an excellent route to regulate the magnetic properties of these layered materials.
研究领域:
材料科学
·
无机化学
·
凝聚态物理
·
纳米技术
·
功能材料
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DOI
高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2024
·Vol. 108
·期 4
·e20316
·
IF 3.5
Diming Xu,Haowei Zhang,Lixia Pang,Fayaz Hussain,Tao Zhou,Shi-Kuan Sun,Zhijiao Chen,Di Zhou
Microwave dielectric ceramics have drawn intensive interests in recent years due to the advanced development in communication area. High-permittivity dielectric ceramics have thus become the highlight owing to dielectric ceramics with high permittivity could meet the demand of electronic components in both stabilization and miniaturization features. Bi 2 (Li 0.5 Ta 1.5 )O 7 shows its great potential among various high-permittivity dielectric ceramics with a suitable permittivity and a considerable quality factor. Based on previous studies, a series of rational optimizations were conducted on Bi 2 (Li 0.5 Ta 1.5 )O 7 to manipulate the temperature coefficient of resonant frequency (TCF) and the sintering temperature for potential Low Temperature Co-fired Ceramic (LTCC) applications. Two distinguished ceramics were obtained, Bi 2 (Li 0.5 Ta 1.5 )O 7 –0.03Bi 2 O 3 (sintering temperature of 850°C, ε r ∼ 64.1, Qf ∼ 8510 GHz, TCF—25.3 ppm/°C) and Bi 2 [(Li 0.5 Ta 1.5 ) 0.975 Ti 0.05 ]O 7 –0.015Bi 2 O 3 (sintering temperature of 980°C, ε r ∼ 66.2, Qf ∼ 10 950 GHz, TCF—8.5 ppm/°C). Dielectric resonator antenna (DRA) simulation was subsequently conducted and proved the ceramics holding excellent potential for microwave applications.
研究领域:
材料科学
·
电子工程
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DOI
高影响因子
Journal of Energetic Materials
·
2019
·
IF 1.649
Qi Jia,Xueyuan Bai,Shaoyong Zhu,Xiong Cao,Peng Deng,Lishuang Hu
Nano (H2dabco)[K(ClO4)3] (DAP-2) were successfully prepared via the milling method. The morphology and structure of the as-obtained sample were characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD) and Fourier transform infrared spectroscopy (FT-IR). The results showed the nano DAP-2 with nearly spherical morphologies have a narrow particle size distribution ranged from 1μm to 2μm. The thermal decomposition properties were investigated by thermogravimetric-differential scanning calorimeter (TG-DSC). The exothermal peak of nano DAP-2 thermal decomposition is 384.5°C decreased by 6.7°C compared with raw DAP-2 (391.2°C). And the apparent activation energy (Ea) of nano DAP-2 was calculated as 173.346 kJ mol−1 by Kissinger equation, which is lower than raw DAP-2 (177.699 kJ·mol−1). Sensitivity study showed that the nano DAP-2 (H50: 60.63 cm) exhibited lower impact sensitivity than raw DAP-2 (H50: 36.79 cm). Therefore, this work provides a simple and effective way to improve the thermal decomposition properties and safety performance of molecular perovskite energetic materials.
研究领域:
材料科学
·
化学
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DOI
高影响因子
MACROMOLECULES
·
2023
·
IF 5.5
Jian Lu,Yu Zhang,Jing Li,Meifang Fu,Guoxiang Zou,Shinji Ando,Yongbing Zhuang
The correlations between the molecular structures of four Tröger’s base (TB)-based polyimides (PIs) and two non-TB containing analogues and physical properties including thermal conductivity (λ) and dielectric properties both at low and high frequencies were investigated in detail. The TB-based PI films exhibited low dielectric constants (Dk = 2.25–2.80) at 10 GHz. They possessed much lower λ values (0.035–0.145 W/mK) compared to the commercial PI Kapton (0.240 W/mK). The influences of incorporating TB units into chain backbones on aggregation structures and physical properties of PIs were identified. Incorporating TB units into chain backbones effectively reduced the degree of chain orientation and increased fractional free volume, leading to both low Dk and low λ values for the resulting PI films. Also, introducing TB units enhanced molecular weights, toughness, and glass-transition temperature (Tg) of the resulting PIs. Therefore, the TB-based PIs can be promising heat-insulating and low-k dielectric materials.
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产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）