ELECTROCHIMICA ACTA
·
2020
·
IF 6.215
Lei Zhang,Hui Fan,Hongyu Wang
Recently, methyl acetate (MA)–based electrolyte solutions have attracted afresh interests in the field of electrochemical energy storage devices at low temperature on account of their distinctive physical properties of low viscosity and melting point. In this work, LiPF 6 –MA based solutions are employed in Li/graphite dual–ion batteries (DIBs). The intercalation behavior of solvated PF 6 − in graphite positive electrode from 1 M LiPF 6 –MA during the initial charge process is quite different from those in the subsequent cycles of charge–discharge. They are diagnosed by conventional electrochemical tests and in situ X–ray diffraction (XRD) measurements. Ethyl methyl carbonate (EMC) is introduced to activate the anion storage in graphite electrode, and then the discharge capacity of graphite positive electrode increases remarkably even in the solution of 1 M LiPF 6 –MA. Moreover, for 1 M LiPF 6 –MA/EMC (5:5 by vol.) at the low working–temperature of −25 °C, the discharge capacity of 41 mA h g −1 delivered by graphite positive electrode is apparently higher than those in both 1 M LiPF 6 –MA and LiPF 6 –EMC. Therefore, the LiPF 6 solutions based on MA/EMC binary solvent mixtures may be suitable for graphite positive electrode working at the low temperatures.
研究领域:
电化学
·
能源存储
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Energy Materials
·
2024
·
IF 5.4
Weihao Wang,Qin Liu,Hong Zhang,Lianmeng Cui,Bomian Zhang,Baokang Niu,Ahmed Eissa Abdelmaoula,Chunhua Han,Lin Xu
The concentrated hydroxide ions (OH–) resulting from the hydrogen evolution reaction gives rise to substantial challenges for the Zn anode/electrolyte interface, including proliferating byproducts and severe dendrite growth. Herein, methyl acetate (MA) additive is proposed to eliminate the crippling OH–, hence manipulating interfacial pH and alleviating accumulation of byproducts. Raman spectra and FTIR analysis elucidate the underlying mechanism of the hydrolysis reaction, which means attacked carbonyl corresponding to the elimination of OH–. In situ pH monitoring verifies availably inhibited OH– concentration with MA additive. From multidimension analysis, the base-catalyzed hydrolysis strategy can significantly protect Zn anode from deterioration during “shelf life” contributing to following superior Zn plating/stripping. Consequently, with MA additive, the pH is stabilized at a lower level of 5.11. Zn plating/stripping achieves a conspicuous cycle life of 2000 h (2.0 mA cm–2 with 2.0 mA h cm–2). Even after “shelf life”, Zn||Zn symmetric cells deliver an impressive cycling stability of 700 h compared to the counterpart of 22 h in ZnSO4. Zn||MnO2/CNT pouch cells with a high mass loading cathode of ∼8 mg cm–2 exhibit a stable lifespan of 100 cycles at 1 C. This work demonstrates a hydrolysis strategy to manipulate interfacial pH and stabilize the interface for the reversible Zn anode.
研究领域:
材料科学
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电化学
✓ 已验证
DOI
高影响因子
JOURNAL OF PHYSICS D-APPLIED PHYSICS
·
2022
·Vol. 55
·期 35
·354004
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IF 3.409
Chun-Liang Zhou,Wen-Bo Ma,Zhen-Long Zhang,Yan-Li Mao
The anti-solvent method is one of the main methods used to prepare two-dimensional (2D) Ruddlesden–Popper (RP)-phase perovskite (PVK) films. To investigate the effect of anti-solvent type on the performance of solar cells based on RP-phase PVK films, three kinds of solvents, toluene (TL), ethyl acetate (EA) and chlorobenzene (CB), were used to prepare 2D RP-phase PVK of GA2MA4Pb5I16. The results display that solar cells based on a 2D PVK layer formed with CB present better performance than those with TL and EA. The results of several investigations show that PVK films formed with CB present lower trap density, longer lifetime, no pinholes and smoother surfaces compared with those formed with TL and EA. This demonstrates that CB is the optimal anti-solvent for the preparation of 2D RP PVK solar cells.
研究领域:
材料科学
·
能源科学
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Meng Liu,Caixia Miao,Peng Xiao,Zhijie Wu
The direct conversion of methanol, a cheap and readily available feedstock, into value-added methyl acetate (MA) is a promising route. Considering the MA formation mechanism is complex, the design of highly selective catalysts is a huge challenge. Herein, we report a Cu@Zr-Beta catalyst, encapsulated Cu metal clusters within Zr-Beta zeolite by an in-situ two-step hydrothermal method, which exhibits high dispersion of Cu species and strong metal-support interaction between Cu and framework Zr species. The formation rate of MA using the Cu@Zr-Beta catalyst is as high as 2.84 mol kg cat -1 h −1 with a methanol conversion of 8.7 % and a MA selectivity of 55.8 % at 240 °C, which outperforms comparison catalysts. Experimental and characterization studies confirm that the electronic interactions between the encapsulated Cu species and Zr atoms not only enable the production of abundant and stable Cu + species but also promote the synergistic effect between Cu + and framework Zr species, thus accelerating the conversion of methanol to MA. In-situ FT-IR and reaction results show that the Cu 0 site is responsible for the dehydrogenation of methanol to CH 2 O*, which then moves to Cu + -Zr(OSi) 4 site and couples with CH 3 O* to form CH 3 CHO*, and finally produces MA through C-O coupling with another CH 3 O*.
研究领域:
化学工程
·
催化科学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Physical Chemistry C
·
2024
·
IF 3.3
Weikang Mei,Guobao Xu,Hongyu Wang
Li4Ti5O12 (LTO)/LiNi0.5Mn1.5O4 (LNMO) batteries have appealing features, such as suitable energy density and high safety. A proper binder of the LNMO cathode and electrolyte can improve the performance of batteries. Herein, we first combined the polyacrylic acid (PAA) binder with an ester-based electrolyte due to their homologous structure. This system has better performance than other binders of LNMO cathode, like poly(vinylidene fluoride) (PVDF), styrene–butadiene rubber (SBR), and polytetrafluoroethylene (PTFE). In the methyl acetate (MA) electrolyte, the LTO/LNMO battery with the PAA binder exhibited the highest discharge capacity (137 mAh g–1 at 0.5 C) and the best rate performance (112 mAh g–1 at 5 C). In addition, MA boosted the low-temperature performance of this battery, which can work at −40 °C with a remarkable reversible capacity of 90 mAh g–1 and a discharge capacity of 140 mAh g–1.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
Nature Communications
·
2025
·Vol. 16
·期 1
·1-11
·
IF 15.7
Zhang Xinyan,Luo Laihao,Liu Chunxiao,Xue Weiqing,Ji Yuan,Zhao Donghao,Liu Pengbo,Feng Xinran,Luo Jun,Jiang Qiu,Zheng Tingting,Li Xu,Xia Chuan,Zeng Jie
Next-generation techniques for sustainable carboxylate production generate carboxylate salts as the primary outcome. To circumvent the costly conversion of carboxylate salts to acids, we demonstrate the aqueous (non-)Kolbe electrolysis process as an alternative strategy to generate downstream value-added chemicals. Upon revealing the irreversible oxidation-induced charge transfer inhibition on the graphite anode, we propose an anion intercalation strategy to mitigate the stability problem induced by the ever-increasing overpotential. In acetate decarboxylation, we observe a high Faradaic efficiency of ~95% for non-Kolbe products (methanol and methyl acetate) at wide current densities ranging from 0.05 to 1 A cm −2 and long-term stability at current densities of 0.15 and 0.6 A cm −2 for 130 and 35 h, respectively. We also extended this strategy for the upgrading of long-chain carboxylates such as propionate, butyrate, and succinate. Our work provides valuable guidance for carboxylate upgrading and extendable strategy for overcoming passivation challenges in catalysis.
研究领域:
化学
·
环境科学
·
催化
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Physical Chemistry C
·
2021
·
IF 4.126
Rui Han,Qian Zhao,Jian Su,Xiaojun Zhou,Xiaofang Ye,Xiaojuan Liang,Juan Li,Hongkun Cai,Jian Ni,Jianjun Zhang
The best research-cell efficiency for quantum dot solar cells has boosted from 11.6 to 18.1% within 5 years due to the evolution of perovskite quantum dots (PQDs) that are being intensively developed along with the flourishing of perovskite thin-film photovoltaics. During the fabrication of PQD devices, as far as we know, methyl acetate (MeOAc) is an ineluctable solvent in ligand exchange for producing highly efficient solar cells. Nevertheless, the reproducibility for PQD solar cells using MeOAc treatment is poor since it has to make a trade-off between removing long-chain organic ligands for high charge transport and keeping them for the stabilization of the black crystal phase. Herein, we demonstrate the degree of MeOAc treatment on CsPbI3 PQD solid films in detail and clarify that MeOAc treatment is able to not only remove the oleyl ligands for promoting the charge transport but also passivate the surface defects in the CsPbI3 PQD solid films. It is noted that immoderate MeOAc treatment could induce the formation of the δ-phase, leading to the degradation of device performance. After locating the balance for MeOAc treatment, the CsPbI3 PQD solar cells are fabricated and optimized without using any additional modifications except MeOAc treatment, and these additive-free devices possess a conversion efficiency surpassing 12%.
研究领域:
材料科学
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能源技术
·
纳米科技
✓ 已验证
产品关联
DOI
高影响因子
LANGMUIR
·
2024
·
IF 3.7
Weikang Mei,Nan Chen,Boyu Wang,Guobao Xu,Hongyu Wang
Methyl acetate (MA) is a suitable solvent for low-temperature electrolyte solutions, but its poor stability against lithium metal is a big problem. Herein, a simple and cheap solution of LiPF6 dissolved in MA was successfully employed for Li4Ti5O12/graphite dual-ion batteries (DIBs). This cell has a long cycle life with 93.1% capacity retention after 1000 cycles. Moreover, it has superior performance at low temperatures (−40 °C) compared to other reported DIBs. The storage behavior of PF6– solvated by MA in graphite cathode has been investigated in detail by in situ X-ray diffraction (XRD) in combination with electrochemical dilatometry (ECD).
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
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2017
·
IF 2.843
Xiaoda Wang,Qinglian Wang,Changshen Ye,Xiaolian Dong,Ting Qiu
This paper aims to present the feasibility of conducting the transesterification of propylene glycol ether (PM) with methyl acetate (MeAc) in a reactive distillation (RD) column to improve the reaction conversion. The essential thermodynamic and reaction kinetic data of the reaction system were measured for the feasibility study. There is only one azeotrope, MeAc–MeOH, in the reaction system, and the NRTL model could describe well the thermodynamic behavior of this system. The transesterification of PM with MeAc is an endothermic reaction with activation energy E = 55.704 kJ·mol–1. The feasibility was analyzed by residue curve maps (RCM), showing that full conversion of PM could be realized by RD with a mole ratio of MeAc–PM larger than 2.882. The intensification effect was experimentally verified in a batch RD column. Finally, some important parameters are given through the conceptual design to develop a continuous RD column for the transesterification of PM with MeAc.
研究领域:
化学工程
·
反应动力学
✓ 已验证
DOI
高影响因子
FLUID PHASE EQUILIBRIA
·
2014
·
IF 2.241
Changshen Ye,Xiaolian Dong,Wenjie Zhu,Dongren Cai,Ting Qiu
Isobaric vapor–liquid equilibrium (VLE) data for three binary systems (PM + PMA, MeAc + PM and MeOH + PMA) at 101.3 kPa were measured in a double circulating still of modified Othmer type. The thermodynamic consistency of the experimental data was checked by Herington method. The experimental data were correlated with NRTL and Wilson models. The binary interaction parameters of both models have been obtained by simplex method. The root mean square deviations (RMSD) for the vapor phase fraction and the boiling temperature are less than 0.01 and 0.5 K, respectively. The results indicate that the calculated values by NRTL and Wilson models are in good agreement with the experimental data and no azeotropic behavior has been found in the three binary systems. The research findings would provide basic data for the design and analysis of distillation process.
研究领域:
化学工程
·
热力学
✓ 已验证
产品关联
DOI
高影响因子
Catalysis Science & Technology
·
2017
·Vol. 7
·期 16
·3511-3523
·
IF 5.773
Xianjie Meng,Heqin Guo,Qiang Wang,Yong Xiao,Congbiao Chen,Bo Hou,Debao Li
In this study, a series of copper/titania–silica mixed oxide (Cu/TS) catalysts with different copper contents were prepared by a sol–gel method. The catalytic activity was evaluated by halide-free methanol carbonylation to methyl acetate (MA). The properties of the catalysts were mainly characterized by N2 adsorption–desorption, X-ray diffraction, dissociative N2O chemisorption, X-ray photoelectron spectroscopy, temperature-programmed desorption of ammonia and in situ Fourier transform infrared. The results show that the crystal size and aggregation degree of Cu increase with increasing Cu content. In addition, the amount of surface Cu+ firstly increases and then decreases, and the maximum is 1.560 mmol g−1 for the 10.24 Cu/TS catalyst. Both the amounts of adsorbed CO and surface Lewis acid sites are found to be proportional to the amount of surface Cu+ species. The catalytic performance shows that the space time yield (STY) of MA is also strongly related to the amount of surface Cu+ species, and the 10.24 Cu/TS catalyst has a maximum of 1.770 mol h−1 kgcat−1. It is found that the surface Cu+ species act not only as metal sites which adsorb CO but also as Lewis acid sites which promote the adsorption of methanol (methoxy). Furthermore, the activation of CO is the major factor for the MA synthesis.
研究领域:
催化化学
·
材料科学
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Hailun Geng,Shengying Zhao,Minghui Tan,Jie Yao,Hao Song,Chuang Gu,Tiecheng Shang,Wenzhong Shen,Guohui Yang,Noritatsu Tsubaki
Metal-zeolite catalysts are widely utilized in various industrial reactions. However, the size, loading, and reduction of metal species are interdependent, complicating efforts to optimize their catalytic performance. In this study, we introduce a novel strategy for the synthesis of metal-zeolite catalysts, termed the multi-amino effect. This new method involves functionalizing zeolite surfaces with aliphatic diamines, such as 1,3-diaminopropane, to leverage the multifaceted properties of the amino group. 1,3-diaminopropane is anchored to the zeolite framework via one terminal amino group, while the other terminal amino group facilitates the efficient loading and dispersion of Cu species through interaction with Cu 2+ . The multi-amino groups present in the structure enable the in situ multi-stage release of abundant NH 3 during calcination, facilitating the self-reduction of Cu species to generate a high proportion of Cu + and Cu 0 species. Notably, the Cu-MOR catalyst prepared by this approach exhibits a significantly improved methyl acetate production rate, which is 1.56 times higher than that of the traditional hydrogen reduction method and 1.37 times greater than that of the ammonia pool method, owing to the abundance of highly dispersed and highly active Cu sites (Cu + :Cu 0 ≈ 1:1). This multi-amino effect strategy will help to develop more efficient and tunable metal-zeolite catalysts, driving advances in industrial processes such as sustainable chemical production and energy conversion, with significant improvements in both catalytic activity and cost-effectiveness.
研究领域:
催化化学
·
材料科学
·
工业化学
·
能源转化
·
绿色化学
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多相催化
·
无机功能材料
✓ 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）