SEPARATION AND PURIFICATION TECHNOLOGY
·
2021
·
IF 7.312
Huijiao Wang,Zhongyi Li,Fengyuan Zhang,Yuxiang Wang,Xian Zhang,Jianbing Wang,Xuwen He
Three types of Magnéli phase anodes (Ti/Ti 4 O 7 , Ti/Ti 4 O 7 -PbO 2 -Ce, and Ti/Ti 4 O 7 nanotube arrays (NTA)) were fabricated, characterized, and compared with other typical active and non-active anodes (i.e., BDD, Ti/Pt, Ti/RuO 2 -IrO 2 , and Ti/IrO 2 -Ta 2 O 5 ) for electro-oxidation treatment of p -nitrophenol (PNP) solution and a real coal chemical concentrated brine in this study. Characterization results indicate a nanotube array structure of Ti/Ti 4 O 7 NTA, and a compact coating of Ti 4 O 7 microparticles and PbO 2 -Ce nanocrystals on the Ti substrate for Ti/Ti 4 O 7 and Ti/Ti 4 O 7 -PbO 2 -Ce, respectively. The three anodes present relatively high oxygen evolution potentials (2.16–2.44 V vs SCE), showing good capacity of electro-generating reactive oxidative species for pollutant degradation. After 30 min of EO treatment, Ti/Ti 4 O 7 NTA and Ti/Ti 4 O 7 removed 89–92% of PNP, which were 10–60% higher than Ti/Pt, Ti/RuO 2 -IrO 2 , and Ti/IrO 2 -Ta 2 O 5 , and were almost comparable with BDD (95%). Furthermore, Ti/Ti 4 O 7 NTA and Ti/Ti 4 O 7 kept very efficient for mineralization of PNP solution and real coal chemical concentrated brine. For Ti/Ti 4 O 7 -PbO 2 -Ce, its degradation efficiency was lower than other two Magnéli phase anodes, but still competitive compared with other active anodes. Thanks to their high removal efficiencies, the three Magnéli phase anodes required relatively low energy demand for pollutant mineralization. Besides, operational parameters such as electrolyte and current density were also very significant for efficient pollutant removal. The results of this study suggest Magnéli phase electrodes as promising and cost-effective anode materials for industrial wastewater treatment, with Ti/Ti 4 O 7 NTA and Ti/Ti 4 O 7 being more efficient options.
研究领域:
环境科学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Qingyu Wang,Xiaorui Liu,Haozhi Wang,Yuanhao Shen,Zequan Zhao,Cheng Zhong,Wenbin Hu
Zn–Ni battery is prospective green energy storage device. However, Zn(OH) 4 2– , the dissolved product of ZnO in the electrolyte, redistributes during the cycle, leading to the shape changing of the anode. This issue severely limits the lifespan of zinc anodes. Despite the success in improving the electrochemical performances of zinc anode via adding Ti 4 O 7 additive, the important mechanism of such modified anode has not been well understood. In addition, the aluminothermic reduction is facile and energy-saving. But the application of Ti 4 O 7 synthesized by this method in Zn–Ni batteries has not been studied. Herein, Ti 4 O 7 synthesized by facile and rapid aluminothermic reduction was applied to alkaline zinc anode. In subsequent electrochemical tests, the discharge capacity and cyclic performance of the zinc-nickel battery was significantly improved by adding as-prepared Ti 4 O 7 particles. At a high discharge current of 2.5 A (34.54 mA cm −2 ), the anode modified by Ti 4 O 7 delivered higher discharge capacity of 364 mAh g −1 , in contrast to the 283 mAh g −1 of pristine anode. Even at ultra-high discharge current of 10 A (138.16 mA cm −2 ), the battery operated stably for 480 cycles. Besides, the mechanism of Ti 4 O 7 modifying anode was studied in-depth by a variety of characterizations and density functional theory (DFT) calculations. We discovered that Ti 4 O 7 simultaneously regulates the distribution of electrons on the anode and Zn(OH) 4 2– in the electrolyte, contributing to forming uniform zinc anode during cycling.
研究领域:
材料科学
·
电化学
·
能源存储
✓ 已验证
产品关联
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2014
·
IF 4.086
Ping Geng,Jingyang Su,Caroline Miles,Christos Comninellis,Guohua Chen
Pure Magnéli Ti 4 O 7 nanotube arrays (NTA) were successfully fabricated by reducing TiO 2 NTA with hydrogen at 850 °C for 30 minutes. The microstructure, composition and electrochemical behavior of the prepared Ti 4 O 7 NTA were characterized by means of X-ray Diffraction, Scanning Electron Microscopy, Transmission Electron Microscopy , X-ray Photoelectron Spectroscopy, Cyclic Voltammetry and Electrochemical Impedance Spectroscopy . The as-prepared Ti 4 O 7 NTA had a highly-ordered tubular structure with high crystallinity , large electrochemical window of water electrolysis (2.4 V vs. Ag/AgCl, pH = 6.0) and low interfacial charge transfer resistance when they were employed as anode for electro-oxidation. Phenol was electro-oxidized on Ti 4 O 7 particles and Ti 4 O 7 NTA with the latter giving 20% more Chemical Oxygen Demand (COD) removal. Pure Ti 4 O 7 NTA also displayed larger degradation coefficient as well as higher COD removal and current efficiency than Boron-doped Diamond and other types of Magnéli NTAs. Cathodic polarization was found to be an effective way of restoring the electrochemical performance of oxidized Ti 4 O 7 NTA as an anode.
研究领域:
材料科学
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电化学
✓ 已验证
产品关联
DOI
高影响因子
Advanced Materials Interfaces
·
2022
·Vol. 9
·期 5
·2101831
·
IF 6.389
Dekai Wu,Chengzhe Yang,Jie Sun,Peng Zhong,Xiaohua Ma,Yimin Lei
In this paper, Ti 4 O 7 /g-C 3 N 4 nanocomposites are successfully prepared by hydrothermal and carbothermal reduction reaction. It shows large specific surface area and electrochemical active surface area (ECSA = 187.82 cm 2 ) and can act as an oxidation reduction reaction catalyst. Compared with commercial Pt/C catalyst, Ti 4 O 7 /g-C 3 N 4 nanocomposites show good catalytic activity in alkaline medium. The peak potential, onset potential, and half-wave potential are 0.74 (versus RHE), 0.96 (versus RHE), and 0.74 V (versus RHE), respectively. It is worth mentioning that Ti 4 O 7 /g-C 3 N 4 catalyst shows better methanol tolerance and cycle stability than commercial Pt/C catalyst. The relative current density attenuation is less than 30% after a long cycle of 24 h.
研究领域:
材料科学
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电化学
✓ 已验证
产品关联
DOI
高影响因子
ENVIRONMENTAL RESEARCH
·
2022
·
IF 8.431
Zhiyuan Zhao,Jinna Zhang,Jie Yao,Shijie You
Electro-oxidation is a promising technology for removal of refractory organic pollutants. While the appeal of this technology lies in its chemical-free nature, commercially scale-up application may be limited by the availability of electrode materials and mass transport. Here we report the development of a flow-through electro-oxidation system for removal of chlorophenols in water using Magnéli-phase (Ti 4 O 7 ) tubular anode and a 304 stainless steel (SS) tubular cathode. The key to this system was the porous and conductive Magnéli-phase Ti 4 O 7 anode, the structure and composition of which was confirmed by scanning electron microscopy, X-ray diffraction and X-ray photoelectron spectroscopy. System efficacy was evaluated by using 4-chlorophenol (4-CP) as a typical refractory contaminant and model chlorophenol. Under optimized conditions, a complete removal of 4-CP could be obtained within 120 min in 0.04 mol L −1 Na 2 SO 4 solution. Electro-produced HO • and direct electron transfer were both shown to contribute to the 4-CP electro-oxidation process due to the high selectivity and oxygen evolution potential of the Ti 4 O 7 anode. The intermediates of 4-CP degradation were identified and a pathway for its electro-oxidation was proposed. When challenged with industrial wastewater containing 4-CP, chemical oxygen demand (COD) and total organic carbon removal efficiencies of 67.5% and 63.1% respectively could be obtained, accounting for energy consumption of 85.1 kWh·kg COD −1 for degradation of 1 kg of COD in industrial wastewater. This study provides an effective and robust solution for the removal of refractory emerging contaminants from industrial wastewaters using a continuous-flow electro-oxidation system.
研究领域:
环境科学
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电化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Xinwei Geng,Yongfeng Xia,Hanqin Liang,Dongxu Yao,Yu-Ping Zeng
Magnéli phases are an important class of transition metal oxides widely utilized in fields such as batteries, electrocatalysis , and photocatalysis . However, there are no reports on the use of Magnéli phases as additives in ceramic sintering. In order to explore the impact of the Magnéli phase as an additive on the sintering process, self-made Magnéli phase Ti 4 O 7 powder was added to the graded mixture of titanium dioxide (TiO 2 ) coarse powder and nanopowder , and sintered under atmospheric conditions in this study. The sintering characteristics, microstructure, and mechanical properties of TiO 2 ceramics with different content of Ti 4 O 7 were characterized. The results revealed that the addition of Ti 4 O 7 contributed to the reduction of the densification temperature of TiO 2 ceramics. Compared to the undoped sample, the addition of 1 wt% Ti 4 O 7 powder significantly improved the flexural strength and Vickers hardness of TiO 2 ceramics by 13.5% and 24.8%. According to the results of thermal analysis, UV–Vis–NIR, and XPS, the mechanism of Ti 4 O 7 in the sintering process of TiO 2 ceramics under atmospheric conditions was systematically discussed. This work not only obtained TiO 2 ceramics with improved performance but also showed the tremendous potential of Magnéli phases in the field of ceramic sintering.
研究领域:
材料科学
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陶瓷
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烧结技术
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机械工程
✓ 已验证
产品关联
DOI
高影响因子
Energy Storage Materials
·
2022
·
IF 20.831
Xuecheng Cao,Chaohui Wei,Xiangjun Zheng,Kai Zeng,Xin Chen,Mark H. Rummeli,Peter Strasser,Ruizhi Yang
Lithium–oxygen (Li–O 2 ) batteries have attracted tremendous attention due to their high specific energy density . However, their sluggish conversion kinetics and detrimental parasitic reactions would deteriorate the lifespan of batteries. Herein, a combined density functional theory (DFT) calculation and experimental approach is carried out to design an efficient cathode electrocatalyst for Li–O 2 batteries. A self-supporting film of Ru clusters anchored on Magnéli phase Ti 4 O 7 enriched with oxygen vacancy (Ru/Ti 4 O 7 ) is fabricated upon electrospinning and carbothermal reduction. In such a synergistic configuration of Ru/Ti 4 O 7 hybrid film, the strong metal-support interaction (SMSI) between Ru and Ti 4 O 7 can improve the charge transfer at the interface and enhance the adsorption energy of intermediates, accelerating the reaction kinetics of the formation/decomposition of Li 2 O 2 . Benefitting from this SMSI, the electrochemical stability of Ru/Ti 4 O 7 over cycling is also enhanced. As a result, as-prepared Ru/Ti 4 O 7 cathodes could realize excellent electrochemical performance , including high specific capacity (11000 mAh g –1 ), low discharge/charge polarization (0.36 V), long lifespan (> 100 cycles) and superior rate capability. Furthermore, a flexible Li–O 2 pouch cell, constructed with as-fabricated Ru/Ti 4 O 7 film cathode, lithium foil anode and GPE , can exert an impressive areal capacity of 5 mAh cm –2 with a low voltage gap of 0.82 V in ambient air. This work suggests that the activity of catalysts can be significantly enhanced with interfacial modification, offering an efficient approach for rational designing of electrocatalysts for use in Li–air batteries and beyond.
研究领域:
材料科学
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能源科学
✓ 已验证
DOI
高影响因子
SOLAR ENERGY
·
2021
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IF 5.742
Hui Wang,Enda Ci,Xiaoqing Li,Jianqiang Li
Photo-thermal conversion and storage phase change material has been obtained much attention recently because that the solar radiation energy can be absorbed, the absorbed solar energy is converted into heat energy and the heat energy can be stored in materials. In this paper, Ti 4 O 7 was selected as the photo-thermal conversion material with full band light absorption (200–2500 nm) and high conversion capacity from light to thermal. Magnesium nitrate hexahydrate/Ti 4 O 7 composites were prepared via melt mixing technique. The comprehensive and systematical characterizations were performed, including X-ray diffraction (XRD), Differential scanning calorimeter (DSC), Fourier transform infrared spectroscopy (FTIR), photo-thermal conversion performances, corrosion test, etc. Experiment results showed Ti 4 O 7 as photothermal conversion materials played an important effect to improve the absorption capacity of composites from 46.54% of pure MNH to 83.86% of MCT-10. MCT-10 has a high energy storage density of 192.17 kJ·kg −1 and the efficiency of photo-thermal conversion and storage is approximately 78.60%. Therefore, this new phase change material is an attractive and efficient heat utilization method for solar thermal storage energy systems which contributes to alleviate the energy crisis.
研究领域:
材料科学
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能源工程
✓ 已验证
产品关联
DOI
高影响因子
PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
·
2023
·
IF 7.8
Jifang Yu,Jianbing Wang,Huijun Yu,Jianwei Hu,Longxin Jiang,Weiyi Wang
Naphthols (NAPs), commonly used phenolic compounds, have significant impact on environmental risk and human health, necessitating advanced treatment methods for their degradation. In this study, a Ti 4 O 7 reactive electrochemical membrane (REM) was developed for the electrochemical oxidation of NAPs. The Ti 4 O 7 REM presented a porosity of 42.18 ± 2.3% and a median pore diameter of 1.21 µm. High permeability (846 LMH bar −1 ) was achieved at relatively low transmembrane pressure and resulted in a convection-enhanced rate constant for Fe (CN) 6 4- oxidation of 1.7 × 10 −4 m/s. The increase in current density and decrease in plate spacing had a positive influence on NAPs degradation. The TOC removal efficiencies of 1-naphthol (1-NAP) and 2-naphthol (2-NAP) were 68.6% and 63.5%, respectively at the current density of 6 mA/cm 2 and plate spacing of 10 mm. Additionally, quantum chemical calculation using density functional theory (DFT) was employed to identify the active sites of NAPs through atom charge and frontier electron density (FED) calculations. Results showed that C14 and C10 were identified as the active sites for 1-NAP, while C9 and C13 were the active sites for 2-NAP. Hydroxyl radical and sulfate radical produced on the electrode surface were the main oxidants for NAPs degradation during the electro-oxidation process. The degradation pathway included hydroxylation , oxygenation, decarbonylation, and ring-open processes, which was in agreement with the theoretical calculations. Furthermore, the quantitative structure-activity relationship (QSAR) predictive model was used to assess the toxicity changes during the electrochemical oxidation process of NAPs, suggesting that the toxicity of intermediates increased at the beginning and significantly reduced at the end. This comprehensive study provides practical and theoretical insights into the application of electrochemical oxidation technique for the reduction of refractory compounds in wastewater.
研究领域:
环境科学
·
化学工程
·
毒理学
✓ 已验证
DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2025
·
IF 7.2
Junjing Li,Han Yu,Yongjiao Ding,Liang Wang
In order to improve the metal utilization of the noble metal Pd and the catalytic activity of the reaction, a novel and efficient Pd/Ti 4 O 7 /Ti electrode was prepared by introducing a Ti 4 O 7 intermediate layer for electrocatalytic hydrodechlorination (EHDC) of chlorinated pharmaceuticals and personal care products (PPCPs). The presence of oxygen vacancies (Ov) on the Ti 4 O 7 surface was confirmed by electron paramagnetic resonance (EPR). The results showed that the introduction of Ti 4 O 7 increased the electrochemical active surface area electrode (ECSA) of the Pd/Ti 4 O 7 /Ti electrode, accelerated the electron transfer rate on the catalyst surface, and promoted the generation of electron-rich Pd, which in turn improved the dechlorination efficiency. The Pd/Ti 4 O 7 /Ti electrode had a removal efficiency of 99.6% for florfenicol (FLO) within 180 min. Meanwhile, the removal efficiency of the Pd/Ti 4 O 7 /Ti electrode was still above 95% in seven cycles, which significantly improved the catalytic activity and stability compared with that of the Pd/Ti electrode. In addition, the reaction pathway for the electrocatalytic hydrodechlorination process of FLO at Pd/Ti 4 O 7 /Ti electrode was proposed. The ecotoxicity of the pollutants was also evaluated by the Toxicity Estimation Software Tool (T.E.S.T) model. In this study, an efficient electrocatalyst for EHDC was explored, and the Pd/Ti 4 O 7 /Ti electrode provided strong support for pollutant removal.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2024
·
IF 18.5
Yang Song,Yongduo Liu,Shijian Luo,Yuran Yang,Fadong Chen,Meng Wang,Lin Guo,Siguo Chen,Zidong Wei
Zinc metal is a promising choice as a high-capacity and cost-effective anode for aqueous zinc-based batteries. However, it faces challenges related to low cycling stability and poor reversibility due to parasitic reactions and the growth of zinc dendrites. In this study, a solution is proposed by introducing a conductive Ti 4 O 7 layer on the zinc anode to enhance electrode stability. The Ti 4 O 7 layer serves a dual purpose, effectively preventing spontaneous corrosion of the zinc anode in the electrolyte, thereby inhibiting the hydrogen evolution reaction and the generation of byproducts. Simultaneously, it promotes Zn nucleation and ensures a uniform electric field distribution, resulting in homogeneous Zn plating and stripping compared to using a bare zinc anode. Consequently, the Ti 4 O 7 -coated Zn anode experiences a significant reduction in over-potential, demonstrating long-term stability and dendrite-free behavior. This outcome ensures low polarization potential and high cycling stability in zinc-ion batteries. The work underscores the potential of conductive oxides in the development of stable metal electrodes.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF SOLID STATE ELECTROCHEMISTRY
·
2023
·Vol. 27
·期 10
·2787-2798
·
IF 2.5
Lei Yimin,Wei Yuxiang,Wu Dekai,Zhu Qing,Sun Yanan,Zhou Xuejiao,Xi He,Zhong Peng,Sun Jie
Electro catalysts play a vital role in facilitating the reaction process in the oxygen reduction reaction (ORR) of fuel cells. In methanol fuel cells, methanol easily penetrates the diaphragm rendering the ORR catalyst inactive. Although commercial platinum exhibits excellent ORR catalytic activity, its poor methanol resistance and long-time durability severely restrict its sustainable development and application. This work synthesized Ti 4 O 7 /CNT nanocomposite electrocatalysts by using the sol-gel method followed by high-temperature carbothermal reduction. The obtained catalysts exhibit a large electrochemically active surface area (347.89 cm 2 ) and low interfacial charge transfer resistance (64.5 Ω). The reduction potential (0.73 V), onset potential (0.93 V), half-wave potential (0.73 V), and electron transfer number (3.7) of this electrocatalyst are all close to those of the Pt/C electrocatalysts in alkaline medium. Simultaneously, it also possesses remarkable methanol tolerance and long-term durability, whose relative current density can maintain above 74% after cycling for 24 h.
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）