Journal of Physical Chemistry C
·
2013
·
IF 4.814
Yongfeng Liu,Chao Li,Bo Li,Mingxia Gao,Hongge Pan
The hydrogen storage properties and mechanisms of the Mg(NH2)2–2LiH system with potassium halides (KF, KCl, KBr, and KI) were investigated and discussed. The results show that the KF-added sample exhibits superior hydrogen storage properties as ∼5.0 wt % of hydrogen can be reversibly stored in the 0.08KF-added sample via a two-stage reaction with an onset dehydrogenation temperature of 80 °C. However, hydrogen storage behaviors of the samples with KCl, KBr, and KI remain almost unchanged. The fact that KF can readily react with LiH to convert to KH and LiF due to the favorable thermodynamics during ball milling should be the primary reason for its significant effects, as the presence of KH provides a synergetic thermodynamic and kinetic destabilization in the hydrogen storage reaction of the Mg(NH2)2–2LiH system by declining the activation energy of the first-step dehydrogenation as a catalyst and reducing the desorption enthalpy change of the second step as a reactant. The understanding on the role played by KF sheds light on how to further decrease the operating temperature and enhance the hydrogen storage kinetics of the metal–N–H system.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
ACS Sustainable Chemistry & Engineering
·
2025
·
IF 7.3
Zilong Rao,Yu Zhang,Shuailong Zhao,Huai Liu,Rui Zhang,Wenlong Jia,Junhua Zhang,Yong Sun,Lincai Peng
Ethyl levulinate (EL) is a crucial biomass-derived compound with diverse applications in pesticides, rubber, pharmaceuticals, and fuel. The efficient conversion of straw into EL presents significant challenges, primarily due to the interference of inorganic components (IOCs). In this study, we aim to enhance the alcoholysis of straw by identifying the specific inhibitory factors and mechanisms of IOCs. A case study on rice straw as a reactant in ethanol over Al(OTf)3 revealed that K+ is a critical inhibitory factor impeding the hydrolysis of cellulose into glucose. Specifically, K+ is adsorbed on O of S–O–Al in [Al(EtOH)m](OTf)3, thus inhibiting the release of H+ and the cleavage of the glycosidic bond. Further, simulating computation reveals that K+ exhibits stronger electrophilicity than H of O–H in [Al(EtOH)m](OTf)3, thus inhibiting the cleavage of H from O–H in ethanol. Consequently, a simple, green acetic acid pretreatment strategy has been developed to enhance the alcoholysis of straw by efficiently eliminating K+, resulting in an EL yield of more than 10 times that of the pristine straw. In conclusion, this study improves the alcoholysis activity of straw and provides novel insights and potential strategies for biorefinery.
研究领域:
生物化学
·
生物质能
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Lei Yang,Xinyu Wang,Chunliu Zhu,Haozhi Wang,Jing Shi,Jingwei Chen,Weiqian Tian,Yue Zhu,Minghua Huang,Jingyi Wu,Huanlei Wang
Molybdenum sulfide (MoS 2 ) is a prospective anode material for potassium-ion batteries, owing to its large interlayer spacing and superior theoretical capacity. Nevertheless, its practical application is hindered by sluggish kinetics and inferior structural stability, which limit its potassium storage performance. Herein, we employ hollow hard-soft carbon bowls (HSCB), consisting of soft carbon uniformly coated on hard carbon bowls, as nanoreactors to confine few-layered MoS 2 nanosheets. The mesoporous carbon shells of HSCB enhance electrolyte penetration and enable rapid charge transfer and robust structural protection, while the mechanical coupling induced by pore filling, alongside the exist of C S Mo chemical bonds, further reinforces the structural integrity of MoS 2 . Additionally, the creation of few-layered MoS 2 structures and MoS 2 /carbon heterostructures promotes efficient K-ion adsorption and diffusion. Notably, there is a strong linear relationship between MoS 2 content and electrochemical performance, including initial Coulomb efficiency, rate performance, and reaction kinetics. Consequently, the optimized MoS 2 /HSCB anode demonstrating a superior reversible capacity of 630 mAh g −1 at 0.1 A g −1 , an exceptional rate capacity of 251 mAh g −1 at 10 A g −1 , and excellent cycling stability, retaining 369 mAh g −1 at 0.5 A g −1 after 700 cycles. Remarkably, a potassium-ion hybrid capacitor assembled with MoS 2 /HSCB anode achieves superior energy/power densities of 122 Wh kg −1 /11266 W kg −1 , along with splendid capacity retention of 89.5 % after 5000 cycles. This work not only offers an innovative approach for the structural engineering of high-performance sulfide-based composite materials but also elucidates the impact of sulfide content on electrochemical performance.
研究领域:
材料科学
·
能源存储
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
FOOD CHEMISTRY
·
2022
·
IF 9.231
Beibei Jia,Jinyu Chen,Gongru Yang,Jingyi Bi,Jinting Guo,Kun Shang,Siyang Wang,Zijian Wu,Kunsheng Zhang
The objective of this study was to investigate the mechanisms of phosphates coupled with KCl (at 0, 0.01 and 0.03 M) affecting gel and emulsifying properties of myofibrillar protein (MP) from mantis shrimp. 31 P NMR showed that phosphate groups were introduced to MP after treatment with sodium pyrophosphate (SPP) or sodium tripolyphosphate (STPP). The incorporation of phosphates enhanced electronegativity and solubility of MP, leading to exposure of hydrophobic groups, especially in the presence of 0.03 M KCl. These changes resulted in increased gel strength, water-holding capacity and elasticity of MP, mainly due to the improved cross-linking of proteins via ionic interaction, hydrophobic interaction and disulfide bonds. Furthermore, the combination of phosphate and KCl contributed to formation of more stable emulsions stabilized by MP with higher emulsifying activity and smaller droplet size. These results indicated that phosphates and low-dose sodium substitutes synergistically improved the processing properties of muscle food.
研究领域:
食品科学
·
生物化学
✓ 已验证
DOI
PubMed
高影响因子
Journal of Energy Storage
·
2025
·
IF 9.8
Rui Nie,Jiajun Wu,Yizhe Nie,Annan Gao,Lihong Yu,Jingyu Xi
Zinc-based flow batteries (ZFBs) have shown great promise as large-scale energy storage devices due to their high energy density, low cost and environmental friendliness. In order to prevent Zinc (Zn) dendrites growth and side-reactions which result in poor cell performance and short cycle life, low-cost potassium chloride is often utilized as the supporting electrolyte to enhance the Zn redox reversibility. In this work, the effect of this supporting electrolyte is studied. Experimental characterizations reveal that cation-type Zn(H 2 O) 5 Cl + solvation structure could transform to an anion-type water-free solvation structure ZnCl 4 2− by adding more chloride salt. The electrostatic shielding effect of potassium ion and anion-type water-free ZnCl 4 2− could homogenize Zn ion flux to achieve a dendrite-less morphology during the reduction process. The improved negolyte enables ZFBs to run for 300 h with a high energy efficiency (>83 %) at 40 mA cm −2 , 20 mAh cm −2 . Besides, the hydrogen-bond network in negolyte is reshaped, expanding the operating temperature range of the system. This work determines the effect of supporting electrolyte in Zn negolyte, which can guide the design of electrolyte and promote further research on Zn electrode in ZFBs.
研究领域:
电化学
·
材料科学
·
能源存储
✓ 已验证
产品关联
DOI
高影响因子
MOLECULES
·
2024
·Vol. 29
·期 9
·2024
·
IF 4.2
Xia Wang,Fanyuan Kong,Wulan Zeng,Huaxiang Zhang,Chunling Xin,Xiangjun Kong
Every late autumn, fluttering poplar leaves scatter throughout the campus and city streets. In this work, poplar leaves were used as the raw material, while H3PO4and KOH were used as activators and urea was used as the nitrogen source to prepare biomass based-activated carbons (ACs) to capture CO2. The pore structures, functional groups and morphology, and desorption performance of the prepared ACs were characterized; the CO2adsorption, regeneration, and kinetics were also evaluated. The results showed that H3PO4and urea obviously promoted the development of pore structures and pyrrole nitrogen (N–5), while KOH and urea were more conductive to the formation of hydroxyl (–OH) and ether (C–O) functional groups. At optimal operating conditions, the CO2adsorption capacity of H3PO4– and KOH–activated poplar leaves after urea treatment reached 4.07 and 3.85 mmol/g, respectively, at room temperature; both showed stable regenerative behaviour after ten adsorption–desorption cycles.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
MICROCHEMICAL JOURNAL
·
2024
·
IF 4.9
Jiawei Zhai,Bin Luo,Tianyang Liu,Hongtu Dong,Xiaotong Jin,Xiaodong Wang,Chunjiang Zhao
The rapid development of modern agricultural biotechnology and information technology has become a key driver of modern agricultural growth. The demand for ion detection is prevalent in all aspects of agriculture. This study details the research on an ion sensor agricultural system using potassium (K) ion-selective electrodes (ISEs). The main emphasis is on the application of artificial neural networks (ANNs) for driving ISE development of accuracy. ISEs based on solid contact with metal oxides, specifically manganese dioxide, are studied. Moreover, the design details of an ion signal acquisition device using the NI-9205 acquisition card and LabVIEW are presented. Finally, based on experimental results of nutrient solution samples, ANNs show better performance than the multiple linear regression method. The mean relative error of K-ISE detection was maintained within 4%. This study thoroughly discusses ISE technology to promote its adoption in agriculture.
研究领域:
农业生物技术
·
信息科学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Xianlu Lu,Dongdong Zhang,Jiang Zhong,Lin Wang,Lan Jiang,Qiao Liu,Gang Shao,Dingfa Fu,Jie Teng,Weiyou Yang
Among the families of modern energy storage devices, the potassium-ion batteries (PIBs) are emerging as a shining star with desired high energy density and interesting commercial application prospect. However, they still encounter the big question with intrinsically bad cycle stability, especially under high-temperature working conditions. In this work, we report the progress on exploring high-temperature PIBs with ultrahigh stability, based on metal organic framework-5 (MOF-5) as anode materials. At the fixed working temperature of 62.5 °C, the as-constructed PIBs have initial discharge and charge specific capacities of respective ∼ 1183 and 210 mA h g −1 at a current density of 200 mA g −1 , and hold a specific capacity of 160 mA h g −1 with a low decay of 0.15% per cycle over 150 cycles. Even at a high current density of 500 mA g −1 , they deliver a reversible specific capacity of 56 mA h g −1 with a tiny decay of 0.018% per cycle over 3000 cycles, which is the state-of-the-art one among those of high-temperature PIBs ever reported. The energy storage mechanism based on C O bond as the redox center is proposed.
研究领域:
材料科学
·
能源存储技术
✓ 已验证
DOI
高影响因子
Small
·
2023
·Vol. 19
·期 39
·2302537
·
IF 13.3
Haozhen Yang,Junlong Huang,Shaohong Liu,Yongqi Chen,Zongheng Cen,Chenguang Shi,Yuheng Lu,Ruowen Fu
Carbonaceous materials are widely investigated as anodes for potassium-ion batteries (PIBs). However, the inferior rate capability, low areal capacity, and limited working temperature caused by sluggish K-ions diffusion kinetics are still primary challenges for carbon-based anodes. Herein, a simple temperature-programmed co-pyrolysis strategy is proposed for the efficient synthesis of topologically defective soft carbon (TDSC) based on inexpensive pitch and melamine. The skeletons of TDSC are optimized with shortened graphite-like microcrystals, enlarged interlayer spacing, and abundant topological defects (e.g., pentagons, heptagons, and octagons), which endow TDSC with fast pseudocapacitive K-ion intercalation behavior. Meanwhile, micrometer-sized structure can reduce the electrolyte degradation over particle surface and avoid unnecessary voids, ensuring a high initial Coulombic efficiency as well as high energy density. These synergistic structural advantages contribute to excellent rate capability (116 mA h g −1 at 20 C), impressive areal capacity (1.83 mA h cm −2 with a mass loading of 8.32 mg cm −2 ), long-term cycling stability (capacity retention of 91.8% after 1200 h cycling), and low working temperature (−10 °C) of TDSC anodes, demonstrating great potential for the practical application of PIBs.
研究领域:
材料科学
·
能源存储技术
✓ 已验证
DOI
高影响因子
Advanced Science
·
2024
·
IF 14.3
Maolin Yang,Ziwei Chen,Zhongyuan Huang,Rui Wang,Wenhai Ji,Dong Zhou,Tao Zeng,Yongsheng Li,Jun Wang,Liguang Wang,Tingting Yang,Yinguo Xiao
The development of the electric vehicle industry has spurred demand for secondary batteries capable of rapid-charging and slow-discharging. Among them, sodium-ion batteries (SIBs) with layered oxide as the cathode exhibit competitive advantages due to their comprehensive electrochemical performance. However, to meet the requirements of rapid-charging and slow-discharging scenarios, it is necessary to further enhance the rate performance of the cathode material to achieve symmetrical capacity at different rates. Simultaneously, minimizing lattice strain during asymmetric electrochemical processes is also significant in alleviating strain accumulation. In this study, the ordered distribution of transition metal layers and the diffusion pathway of sodium ions are optimized through targeted K-doping of sodium layers, leading to a reduction of the diffusion barrier and endowment of prominent rate performance. At a 20C rate, the capacity of the cathode can reach 94% of that at a 0.1C rate. Additionally, the rivet effect of the sodium layers resulted in a global volume strain of only 0.03% for the modified cathode during charging at a 10C rate and discharging at a 1C rate. In summary, high-performance SIBs, with promising prospects for rapid-charging and slow-discharging capability, are obtained through the regulation of sodium layers, opening up new avenues for commercial applications.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
MICROPOROUS AND MESOPOROUS MATERIALS
·
2021
·
IF 5.455
Daliang Guo,Dinggen Hu,Zhongyu Yan,Kangshuai Yuan,Lizheng Sha,Huifang Zhao,Jianbin Chen,Bei Liu
In order to study the property of lignin-based porous carbon activated by potassium tartrate, the effects of activator types, activator/lignin mass ratio and activation temperature on the surface morphology , specific surface area and pore size distribution of alkali lignin based porous carbon materials were systematically investigated. Meanwhile, the methyl orange adsorption capacity and adsorption kinetics of the lignin-based porous carbon were also evaluated. The N 2 adsorption-desorption experiment results showed that the specific surface area value of lignin-based porous carbon materials activated by potassium tartrate (APC-J), KOH (APC-K), and NaOH (APC-Na) are 947, 1113 and 762 m 2 /g, respectively. Meanwhile, APC-J has a special microporous structure, while the pore structures of APC-K and APC-Na are mainly mesopores . The best specific surface area of lignin-based porous carbon materials was 1911 m 2 /g obtaining from APC-J-2-8 sample (mass ratio 2:1, activation temperature 800 °C). The adsorption experiment of methyl orange (MO) showed that the adsorption kinetics of APC-J-2-8 conformed to the quasi-second-order kinetic model , mainly chemical adsorption . The isothermal adsorption process conforms to the Langmuir adsorption isothermal adsorption model, which is a single molecular layer adsorption, and the maximum adsorption amounts are 526.31 mg/g.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2018
·
IF 6.735
Junyu Fan,Zhaoxia Ding,Zhiwei Zhao,Jie Liu
In this study, potassium ferrate(VI) was employed for the degradation of p-arsanilic acid (p-ASA) and simultaneous removal of the generated arsenic species though in-situ coagulation. The effects of several factors, including ferrate(VI) dosage, initial pH, coexisting anions, and humic acid, on the p-ASA degradation and arsenic species removal were investigated. Under various water quality conditions, an excellent removal of p-ASA could always be achieved with the 20:1 mol radio dosage of ferrate(VI) and p-ASA within 30 min. But the removal of arsenic species is significantly affected by the water quality. It could be inhibited by alkalinity and presence of phosphate and humic acid. The generated ferric oxide was mainly 2-line ferrihydrite according to the XRD and XPS analysis. Based on the HPLC-HG-AFS and GC–MS analysis, the major degradation products were detected and the mechanism of the p-ASA degradation by ferrate(VI) and the released arsenic removal by 2-line ferrihydrite generated from ferrate(VI) was given. Two simultaneous degradation pathways of p-ASA were proposed. The p-ASA in solution attacked by ferrate(VI) in solution would lead cleavage of the As–C bond firstly to generate As(III) and p-aminophenol. On the other hand, small amounts of p-ASA initially absorbed on 2-line ferrihydrite would be firstly converted to 4-nitrophenylarsonic acid through the oxidation of –NH 2 to –NO 2 by ferrate(VI), subsequently transformed to As(III) and p-nitrophenol. Combined with the strong oxidizing and the high removal capacity of released arsenic by its generated product, ferrate(VI) have well potential applications for controlling the risk of p-ASA in wastewater.
研究领域:
环境科学
·
化学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）