GREEN CHEMISTRY
·
2014
·Vol. 17
·期 1
·453-459
·
IF 6.852
Muge Niu,Yucui Hou,Shuhang Ren,Weize Wu,Kenneth N. Marsh
Formic acid (FA) is an important material widely used in the chemical industry and in processes involved in energy storage and transformation. In this work, production of FA from wheat straw, an abundant lignocellulosic biomass, in NaVO3–H2SO4 aqueous solution with molecular oxygen (O2) was studied. The conversion showed high efficiencies: 47% (based on carbon, 75.2% based on mass) of FA and 7.3% (based on carbon, 7.6% based on mass) of acetic acid were obtained. The products mainly come from polysaccharides (hemicellulose and cellulose) in wheat straw. Acetic acid is derived from the acetyl groups in (1) the hemicellulose structure or (2) the deep hydrolysis product, levulinic acid. The removal of each lignocellulosic component in wheat straw follows the order: hemicellulose, lignin and cellulose. The catalytic system shows good reusability, and multiple feedings led to a high concentration of FA, which is beneficial to reduce FA–water separation cost.
研究领域:
生物化学
·
可再生能源
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2018
·
IF 3.779
Yang Xu,Handong Jiao,Mingyong Wang,Shuqiang Jiao
Vanadium-aluminum (V-Al) alloy, the master alloy for the well-known Ti-6Al-4V alloy, is mainly produced via aluminothermic reduction process of V 2 O 5 over the past decades. However, the reaction rate is too fast and it is difficult to control the product quality. Moreover, the utilization of aluminum is very low due to the production of Al 2 O 3 . In this work, a new method is proposed to prepare V-Al alloys by molten salt electrolysis of soluble NaVO 3 on a liquid aluminum (Al) cathode in molten NaCl-KCl melt. The results show that VO 3 − ions can be reduced to metallic V-Al alloys on the liquid Al cathode during electrolysis process. Furthermore, thermodynamic and electrochemical analysis indicate that the reduction of VO 3 − ions on the liquid Al cathode results from the combined effect of electroreduction and aluminothermic reduction. In this process, the liquid Al can not only reduce VO 3 − ions to V, but also to combine with vanadium to form V-Al alloys. However, unlike the traditional aluminothermic reduction process, alumina produced due to the aluminothermic reduction will be in-situ electro-reduced to aluminum, which will be helpful to increase the utilization of aluminum. As a result, when the electrolysis voltage is enough large, VO 3 − ions will be completely reduced. Al 3 V alloy without alumina can be obtained.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2023
·Vol. 34
·期 5
·2302397
·
IF 19
Fanbin Zeng,Senlin Li,Sanlue Hu,Minling Qiu,Guobin Zhang,Meilin Li,Caiyun Chang,Hongliang Wang,Minwei Xu,Lirong Zheng,Yongbing Tang,Cuiping Han,Hui-Ming Cheng
Calcium ion batteries (CIBs) are considered as an important candidate for post-lithium energy storage devices due to their abundance of resources and low cost. However, CIBs still suffer from slow kinetics due to the large solvation structure and high desolvation energy of Ca 2+ ions. Here, a solvation regulation strategy based on donor number (DN) is reported to achieve easy-desolvation and rapid storage of Ca 2+ in sodium vanadate (Na 2 V 6 O 16 ·2H 2 O, NVO). Specially, the solvent with a low DN, represented by propylene carbonate (PC), forms the first solvation shell of calcium ions with weak binding energy and small shell structure, which facilitates the migration of Ca 2+ in the electrolyte. More importantly, the low DN solvent is preferentially desolvated at the cathode/electrolyte interface, promoting the insertion of Ca 2+ into the NVO electrode. Mechanism studies further confirm the highly reversible uptake/release of Ca 2+ in the NVO cathode, along with the V O distance change in the coordination structure. Therefore, the NVO cathode achieves high capacity (376 mAh g −1 at 0.3 A g −1 ) and high-rate performance (151 mAh g −1 at 5 A g −1 ). The weak solvation effect strategy further improves the electrochemical performance and provides great importance for the design of the long-term development of CIBs.
研究领域:
电化学
·
能源材料
·
无机化学
·
储能技术
·
材料科学
✓ 已验证
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2019
·
IF 5.383
Fangjie Tang,Weijun Zhou,Minfeng Chen,Jizhang Chen,Junling Xu
Most recently, aqueous zinc-ion batteries (AZIBs) are the research focus because of their low cost, high safety, and eco-friendliness. In this respect, flexible binder-free electrodes have been investigated by several studies to keep pace with the development of wearable electronics. However, the mass loading of active materials in these electrodes is usually below 2 mg cm −2 , considerably limiting the areal capacity. Herein, we report a paper electrode prepared via a facile vacuum filtration technique with a high mass loading of 5 mg cm −2 for the active material, namely, reduced graphene oxide (rGO)/δ-Na x V 2 O 5 ·nH 2 O nanocomposite . Thanks to the homogeneous distribution and synergistic effect of the active material, carbon nanotubes , and cellulose fibers, the electrode not only exhibits good mechanical property and high electrical conductivity but also displays impressive performances for AZIBs. It achieves an admirable areal specific capacity of 1.87 mAh cm −2 (corresponding to 374.9 mAh g −1 for the active material), substantially higher than that of other flexible binder-free electrodes for (hybrid) AZIBs. Meanwhile, this electrode also shows good rate capability and excellent long-term cyclability (with a capacity retention of 92% over 4000 cycles). This work opens new opportunities towards flexible free-standing electrodes.
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
CHINESE JOURNAL OF CATALYSIS
·
2025
·
IF 17.7
Fangwei Liu,Kunkun Wei,Youwen Chen,Jingbo Hu,Yue Wang,Chengyuan Liu,Yang Pan,Xutao Chen,Shihui Zou,Jie Fan
The production of C 2 H 3 Cl from CH 3 Cl (MCTV) represents a promising non-petroleum route for synthesizing C 2 alkenes from C 1 molecules. Exploration of new MCTV catalysts is crucial for advancing sustainable chemical production. In this study, we present NaVO 3 as a surface-confined coupling center for • CH 2 Cl radicals, demonstrating its superior performance in the selective coupling of methyl chloride to synthesize vinyl chloride. By incorporating NaVO 3 onto the surface of CeO 2 , the catalyst enables effective capture of • CH 2 Cl radicals during the CH 3 Cl oxidative pyrolysis and their subsequent conversion into C 2 H 3 Cl. We experimentally validate the capability of highly dispersed NaVO 3 to controllably couple • CH 2 Cl radicals through in-situ synchrotron-based vacuum ultraviolet photoionization mass spectrometry. The results demonstrate that the dispersion of NaVO 3 on the catalyst surface has a considerable impact on the reaction efficiency of • CH 2 Cl radicals and the overall MCTV performance. This discovery holds substantial implications for the controlled C 1 radical transformation and provides a guidance for the design of catalysts for sustainable production of C 2 H 3 Cl.
研究领域:
催化
·
化学合成
·
可持续化学
·
表面化学
·
反应工程
✓ 已验证
产品关联
DOI
高影响因子
ACS Nano
·
2022
·
IF 18.027
Xiaoke Wang,Xixi Zhang,Gang Zhao,Hu Hong,Zijie Tang,Xijin Xu,Hongfei Li,Chunyi Zhi,Cuiping Han
Magnesium ion batteries have potential for large-scale energy storage. However, the high charge density of Mg2+ ions establishes a strong intercalation energy barrier in host materials, causing sluggish diffusion kinetics and structural degradation. Here, we report that the kinetic and dissolution issues connected to cathode materials can be resolved simultaneously using a tetraethylene glycol dimethyl ether (TEGDME)–water hybrid electrolyte. The lubricating and shielding effect of water solvent could boost the swift transport of Mg2+, contributing to a high diffusion coefficient within the sodium vanadate (NaV8O20·nH2O) cathode. Meanwhile, the organic TEGDME component can coordinate with water to diminish its activity, thus providing the hybrid electrolyte with a broad electrochemical window of 3.9 V. More importantly, the TEGDME preferentially amassed at the interface, leading to a robust cathode electrolyte interface layer that suppresses the dissolution of vanadium species. Consequently, the NaV8O20·nH2O cathode achieved a specific capacity of 351 mAh g–1 at 0.3 A g–1 and a long cycle life of 1000 cycles in this hybrid electrolyte. A mechanism study revealed the reversible interaction of Mg2+ during cycles. This organic water hybrid electrolyte is effective for overcoming the difficulty of multivalent ion storage.
研究领域:
储能
·
电化学
·
材料科学
·
电池技术
✓ 已验证
DOI
高影响因子
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