Carbon Neutralization
·
2024
·
IF 0
Longwei Li,Rongrong Li,Shaojie Zhou,Wenjun Xu,Yu Li,Jingmin Zhang,Lei Gao,Xiong Pu
Zinc bromine flow batteries (ZBFBs) are well suited for stationary energy storage due to their attractive features of high energy density and low cost. Nevertheless, the ZBFBs suffer from low power density and limited efficiency owing to the relatively severe polarization of the Br 2 /Br − redox couple. Herein, a three-dimensional (3D) hierarchical composite electrode based on core-shell Ni/NiO heterostructures anchored on graphite felt (Ni/NiO@GF) is designed to promote the kinetics of the Br 2 /Br − couple, so as to improve the power density and efficiency of the ZBFB. In this design, the highly conductive carbon felt and Ni cores provide a composite electrode with a 3D electron transporting framework to guarantee excellent electronic conductivity, while the NiO shells possess great absorption ability to Br 2 and brilliant catalytic activity for the Br 2 /Br − redox reaction to reduce the electrochemical polarization. As a result, an enhanced ZBFB with Ni/NiO@GF electrode shows an outstanding energy efficiency of 86% at 20 mA cm −2 and can be operated at a current density of up to 160 mA cm −2 with a respectable energy efficiency of 67%. These results exhibit a promising strategy to fabricate catalytic electrodes for high-performance ZBFBs.
研究领域:
电化学
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能源存储
·
材料科学
✓ 已验证
DOI
IONICS
·
2017
·Vol. 23
·期 6
·1375-1382
·
IF 2.062
Xu Lihuan,Guo Pengju,He Huihui,Zhou Ningning,Ma Jiaojiao,Wang Guosheng,Zhang Cheng,Su Chang
Composite electrodes based on the nitroxide free radical-contained pyrrole copolymer (PPy- co -PPy-C-TEMPO) as active material were one-step synthesized by in situ electrochemical polymerization, which was then directly applied as the cathode of lithium ion batteries. The structure, morphology, electrochemical property, and charge-discharge performances of prepared copolymers were characterized by FTIR, SEM, cyclic voltammogram, electrochemical impedance spectroscopy, and galvanostatic charge-discharge testing, respectively. The results demonstrated that PPy- co -PPy-C-TEMPO-based composite cathodes have been successfully prepared by in situ electrochemical method, and the introduction of the nitroxide free radical (TEMPO) could obviously affect the morphology and electrochemical characteristics of the obtained electroactive polymers. And the charge/discharge tests showed that with the introduction of the TEMPO, PPy- co -PPy-C-TEMPO-based composite cathodes exhibited an improved specific capacity of 70.9 mAh g −1 for PPy- co -PPy-C-TEMPO (4:1) and 62.6 mAh g −1 for PPy- co -PPy-C-TEMPO (8:1) as measured at 20 mA g −1 between 2.5 and 4.2 V, which were remarkably higher than that of the pure PPy cathode of 41.0 mAh g −1 under the same experimental conditions. Also, the obtained PPy- co -PPy-C-TEMPO copolymers demonstrated an acceptable cycling stability during the charge-discharge process. These obtained cell performances for the composite cathodes were attributed to the application of the in situ electrochemical polymerization technology, which enhanced the intimate integration between conductive polymer film and electrode. Furthermore, the introduction of TEMPO-contained pyrrole (Py-C-TEMPO) improved the morphology of the composite cathode, which was in favor of the utilization of active materials and the improved electrochemical performances.
研究领域:
材料科学
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电化学
·
能源存储
✓ 已验证
DOI
高影响因子
JOURNAL OF SOLID STATE ELECTROCHEMISTRY
·
2013
·Vol. 17
·期 11
·2789-2794
·
IF 2.279
Lv Weixin,Zhang Rui,Gao Pengran,Gong Chunxia,Lei Lixu
The electrochemical reduction of carbon dioxide (CO 2 ) is investigated in acetonitrile with tetrabutylammonium perchlorate as an electrolyte using a lead cathode and a sacrificial zinc anode, and the product under such a setup is insoluble zinc oxalate at potentials between −2.2 and −2.8 V vs. Ag rod electrode. Preelectrolysis is an effective method to remove the water in the electrolyte, which makes a distinct reduction peak of CO 2 appear at −2.6 V vs. Ag on cyclic voltammogram. Even trace amounts of water in the electrolyte can interfere with the faradaic efficiency of reduction of CO 2 to oxalate, and the product could be β-ZnC 2 O 4 (in anhydrous solution) or ZnC 2 O 4 · 2H 2 O (if water exists). The faradaic efficiency for oxalate production also depends on the cathode potential and the temperature, and the maximum is 96.8 % at −2.6 V vs. Ag and 5 °C. This is the highest value of CO 2 electrochemical reduction found in the literature under ambient pressure.
研究领域:
电化学
·
环境科学
·
材料科学
·
能源化学
·
物理化学
✓ 已验证
DOI
高影响因子
Batteries & Supercaps
·
2023
·Vol. 6
·期 5
·e202300010
·
IF 5.7
Pu Yu,Junxiao Wang,Xiaotang Gan,Zhihua Guo,Liang Huang,Zhiping Song
Graphical Bipolar ion storage : Thionin (Thn-CH 3 COO), a biological dye, can be also used as a high-performance bipolar-type organic cathode material for aqueous rechargeable zinc batteries. In the Zn(CF 3 SO 3 ) 2 electrolyte, both CH 3 COO − and CF 3 SO 3 − anions participate the p-type reaction, while H + cation dominate the n-type reaction. Organic cathode materials (OCMs) have been widely applied in aqueous rechargeable zinc batteries (ARZBs), but there are still many novel structures to be explored for better electrochemical performance and clearer mechanism. Herein, we have studied an organic biological dye, namely thionin (Thn-CH 3 COO), as a bipolar-type OCM for ARZBs based on its electroactive phenothiazine unit. In the optimal electrolyte of 2 M Zn(CF 3 SO 3 ) 2 , Thn-CH 3 COO exhibited the lowest solubility and thus the highest cycling stability (94 % capacity retention after 100 cycles), with a reversible capacity of 162 mAh g −1 (the theoretical value is 186 mAh g −1 ) and a discharge plateau at ∼0.8 V vs. Zn 2+ /Zn. Various characterization and DFT calculations have revealed that both CH 3 COO − and CF 3 SO 3 − anions and H + cations participated the p-type and n-type reactions, respectively. In brief, the novel structure, competitive performance, and exhaustive mechanism investigation will facilitate the further development of ARZBs based on OCMs.
研究领域:
材料科学
·
电化学
·
能源存储
✓ 已验证
DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2020
·Vol. 30
·期 27
·2001619
·
IF 16.836
Jiaxin Li,Lie Wang,Yang Zhao,Shangyu Li,Xuemei Fu,Bingjie Wang,Huisheng Peng
Lithium-carbon dioxide (Li-CO 2 ) batteries are considered promising energy-storage systems in extreme environments with ultra-high CO 2 concentrations, such as Mars with 96% CO 2 in the atmosphere, due to their potentially high specific energy densities. However, besides having ultra-high CO 2 concentration, another vital but seemingly overlooked fact lies in that Mars is an extremely cold planet with an average temperature of approximately −60 °C. The existing Li-CO 2 batteries could work at room temperature or higher, but they will face severe performance degradation or even a complete failure once the ambient temperature falls below 0 °C. Herein, ultra-low-temperature Li-CO 2 batteries are demonstrated by designing 1,3-dioxolane-based electrolyte and iridium-based cathode, which show both a high deep discharge capacity of 8976 mAh g −1 and a long lifespan of 150 cycles (1500 h) with a fixed 500 mAh g −1 capacity per cycle at −60 °C. The easy-to-decompose discharge products in small size on the cathode and the suppressed parasitic reactions both in the electrolyte and on the Li anode at low temperatures together contribute to the above high electrochemical performances.
研究领域:
材料科学
·
能源技术
✓ 已验证
产品关联
DOI
高影响因子
SCIENCE OF THE TOTAL ENVIRONMENT
·
2019
·
IF 5.589
Song Chen,Lin Tang,Haopeng Feng,Yaoyu Zhou,Guangming Zeng,Yue Lu,Jiangfang Yu,Xiaoya Ren,Bo Peng,Xiaocheng Liu
The adsorbability on the carbonaceous cathode plays an important role in electro-Fenton systems but does not obtain enough attention. In this work, various carbon felts were obtained with different adsorption property by using the method of KOH activation at different temperatures to explore the influence of adsorption on the degradation efficiency of tetracycline (TC). The results of morphology characterization, nitrogen adsorption-desorption tests, XPS and FTIR analysis revealed that the surface area of carbon felt was improved, and the oxygen-containing functional groups on the surface were increased via KOH method with significantly enhanced adsorption capacity. In the batch experiment of TC electro-Fenton degradation, the carbon felt with better adsorption capacity tended to get higher degradation and mineralization efficiency. With the KOH activation process, CF-900 (carbon felt at 900 °C for 1 h) exhibited the best TC adsorption property for the removal of TC within 30 min (initial concentration: 80 mg/L). Meanwhile, the constant of reaction rate for TC degradation at the CF-900 is 0.0648 min −1 . It is higher than that (0.012 min −1 ) obtained at the raw carbon felt (∼5 times of enhancement). There are also synergistic effects between adsorption and degradation performance on some other organic pollutants. In addition, the degradation pathway was also studied by the methods of solid-phase extraction and high performance liquid chromatography-mass spectrometry (HPLC). From the obtained results, it is shown that good adsorbability is favorable for degradation in the homogeneous electro-Fenton system.
研究领域:
环境科学
·
水处理工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
MICROCHEMICAL JOURNAL
·
2020
·
IF 3.594
Quanfang Lu,Hui Luo,Jie Yu,Yuejing Kang,Zhuanhong Lu,Juanlong Li,Wu Yang
A simple sample introduction system has been successfully developed, and then integrated with liquid cathode glow discharge (LCGD) to form atomic emission spectrometry (AES) for the detection of rubidium (Rb), cesium (Cs) and strontium (Sr) in water samples by using a fiber-optic spectrometer, in which a buffer bottle was employed to improve the stability of microplasma, and a six-port valve equipped with sample loop was used to reduce the sample consumption and enhance the analytical precision and speed. The effects of flow rate, discharge voltage, supporting electrolyte and solution pH on signal intensity were examined systemically. The matrix interferences of major cations and anions in aqueous solution were also evaluated. The results indicated that the optimal operating conditions are 2.4 mL min −1 flow rate, 660 V discharge voltage and pH = 1.0 HNO 3 as supporting electrolyte. Only Al 3+ ions interfere with the determination of Rb, Cs and Sr. The limits of detection (LODs) of Rb, Cs and Sr are 0.18, 0.17 and 0.21 mg L −1 , respectively, which are basically inferior to those of the closed-type electrolyte cathode atmospheric discharge (ELCAD). The relative standard deviation (RSD) is 2.7% for Rb, 2.0% for Cs and 2.5% for Sr, the correlation coefficients ( R 2 ) of Rb, Cs and Sr are over 0.999, and the power is below 50 W. The measured results of Rb, Cs and Sr are in agreement well with the spiked values, and the satisfactory recoveries of standard addition are obtained between 97 and 111%. The advantages of small size, low sample and power consumption and high stability suggested that the LCGD-AES is a promising technique for the detection of Rb, Cs and Sr in water samples.
研究领域:
分析化学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
SENSORS
·
2020
·Vol. 20
·期 22
·6686
·
IF 3.275
Chenyu Xiong,Yuhao Xu,Chao Bian,Ri Wang,Yong Xie,Mingjie Han,Shanhong Xia
Mercury ions (Hg2+) pollution in the water environment can cause serious harm to human health. Trace Hg2+detection is of vital importance for environmental monitoring. Herein, we report a novel design of Ru-MOFs modified gold microelectrode for Hg2+determination. Ru-MOFs are synthesized directly by the cathodic method on gold microelectrode, with the covered area accurately controlled. Cathodic synthesized Ru-MOFs show good conductivity and are suitable to be used as the electrode surface material directly. The synergy of the pre-deposition process and the adsorption process of Ru-MOFs can effectively improves the performance of the sensor. The results show good linearity (R2= 0.996) from 0.1 ppb to 5 ppb, with a high sensitivity of 0.583μA ppb−1mm−2. The limit of detection is found to be 0.08 ppb and the test process is within 6 min. Most importantly, the senor has a good anti-interference ability and the recoveries are satisfactory. This miniature electrochemical sensor has the potential for on-site detection of trace mercury in the field.Keywords:mercury ions;metal-organic frameworks;electrochemical micro-sensor;cathodic synthesis
研究领域:
环境科学
·
分析化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Applied Materials & Interfaces
·
2021
·
IF 9.229
James Kumankuma-Sarpong,Shuai Tang,Wei Guo,Yongzhu Fu
Conventional organic batteries suffer from rapid capacity fading. Organic compounds are inclined to dissolve in the electrolyte and limit the long-term cycling performance of lithium–organic batteries. Carbon skeletons show efficacy in confining the active materials of organic cathodes. In this study, we investigate the electrochemical performance of aqueous zinc-ion batteries with binder-free composite cathodes consisting of carbon nanotubes (CNTs) and naphthoquinone (NQ)-based organics. The quinones are trapped in the nanoporous structure of the CNT framework, and thus the dissolution was minimized. The composite cathodes show stable and high rate cyclability, owing to the high electrical conductivity and confinement of the CNT network. The NQ composite cathode exhibits an initial capacity of 333.5 mAh g–1, close to the theoretical capacity of 339.0 mAh g–1. Furthermore, it is uncovered that modifying NQ with functional groups significantly impacts the electrochemical behavior, including the redox potential and capacity retention. With the electron-withdrawing or electron-donating groups, dichlone and 2-((4-hydroxyphenyl) amino) naphthalene-1,4-dione (APh-NQ) show better performance than NQ with improved capacity retention from 41.0 to 70.9 and 68.3%, respectively, after 1000 cycles. The work promotes the development of binder-free organic cathodes for the aqueous Zn-ion batteries and sheds light on designing high-performance electrodes for low-cost energy storage systems.
研究领域:
材料科学
·
能源存储技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ELECTROCHIMICA ACTA
·
2016
·
IF 4.803
Fang Wang,Haojun Li,Qixing Wu,Jie Fang,Yang Huang,Chunli Yin,Yanghai Xu,Zhongkuan Luo
In this work, we proposed using titanium dioxides (TiO 2 ) with oxygen vacancies (H-TiO 2 ) as cathode catalysts to improve the electrochemical performance of non-aqueous lithium-air batteries. Such H-TiO 2 catalysts were attained by a facile heat treatment of rutile TiO 2 and the existence of vacancies was confirmed by Raman spectra and X-ray photoelectron spectroscopy (XPS). It was demonstrated that due to the presence of defects which can facilitate the adsorption and dissociation of oxygen, the in-house lithium-air battery with H-TiO 2 can be discharged at the current densities of 0.3 and 0.5 mA cm −2 while maintaining the specific capacities of 3.2 and 2.8 mAh cm −2 , respectively, much higher than those of the batteries without catalysts or with pristine rutile TiO 2 . In addition, the cycling test showed that the battery with H-TiO 2 can undergo 400 and 372 cycles, respectively, at the current densities of 0.3 and 0.5 mA cm −2 with a fixed specific capacity of 0.1 mAh cm −2 and a cutoff discharge voltage of 2.0 V.
研究领域:
材料科学
·
能源技术
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2017
·
IF 6.216
Yujiao Long,Hongna Li,Xuan Xing,Jinren Ni
This study presented a significant enhanced removal of Microcystis aeruginosa by simple addition of Fe 2+ at circumneutral pH in the electrochemical system with boron-doped diamond (BDD) anode and carbon felt (CF) cathode. Results showed that over 99.9% of the M. aeruginosa cells were removed in 60 min when 0.2 mM Fe 2+ was added to the system. The pseudo-first order rate constant for BDD-CF-Fe 2+ system was almost 15 times higher than that (0.005 min −1 ) for BDD-CF system. The excellent performance of the BDD-CF-Fe 2+ system over the BDD-CF system was observed over a wide range of pH from 3 to 9. Based on the evolution of Fe 2+ /Fe 3+ , pH, H 2 O 2 and OH, mechanism of enhanced removal of M. aeruginosa was revealed in the BDD-CF-Fe 2+ system. H 2 O 2 was electrochemically generated through reduction of dissolved oxygen on the surface of the CF cathode, and the added Fe 2+ was rapidly adsorbed and precipitated also on the CF cathode. Comparisons of BDD-CF-Fe 2+ , BDD-CF-Fe 3+ and BDD-CF-Fe 2+ /Fe 3+ systems proved that the electrochemical reduction of Fe(III) to Fe(II) could guarantee the sustainable cycle between Fe(II) and Fe(III). Through heterogeneous electro-Fenton reactions, much higher amount of OH would be continuously generated compared with the BDD-CF system. Thereby, the lipid peroxidation on the cell membrane of M. aeruginosa was intensified through the addition of Fe 2+ . Moreover, the degradation of intracellular microcystin was remarkably accelerated, and the extracellular microcystin was controlled more safely due to Fe 2+ addition. This study provided an alternative method to enhance the electrochemical mitigation of cyanobacteria-polluted waters.
研究领域:
环境科学
·
微生物学
·
水处理技术
✓ 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
危险品化学品经营许可证（带存储）