CHEMICAL ENGINEERING JOURNAL
·
2020
·
IF 10.652
Lele Cui,Zhiwen Li,Qingqing Li,Meifei Chen,Wenheng Jing,Xuehong Gu
The development of transition metal oxide-based integrated carbonaceous materials for use as bifunctional electrodes of high stability and activity in the heterogeneous electro-Fenton (EF) process is supposed to have great potential in environmental governance. Herein, Cu/CuFe 2 O 4 (CCFO) with different Cu 0 ratios were synthesized by a facile one-step solvothermal approach. These materials were subsequently used to fabricate modified graphite felt through the polytetrafluoroethylene (PTFE)-bonding technique. Importantly, with its hydrophobicity PTFE effectively inhibited metal leaching from the thus obtained cathodes and improved the oxygen utilization rate. Cathode performance in EF-based tetracycline (TC) degradation was found to increase with Cu 0 ratio. The observed increase in activity was attributed to Cu 0 enhancing the 2-electron oxygen reduction reaction selectivity (i.e., H 2 O 2 production) and endowing the cathode with abundant electron-rich centers that accelerated active Fe(II) regeneration, causing rapid conversion of H 2 O 2 to hydroxyl radical ( OH). The possible TC mineralization pathway was inferred by liquid chromatography–mass spectrometry (LC–MS) analysis, and a catalytic mechanism of the heterogeneous EF process was proposed. The most effective cathode fabricated displayed high stability even at pH 3 (0.84 ± 0.11 mg/L Fe and 1.35 ± 0.17 mg/L Cu leaching) and exhibited nearly 80% TC removal efficiency after five oxidation cycles, demonstrating its potential use in heterogeneous EF technology for efficient and durable wastewater treatment.
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
JOURNAL OF ALLOYS AND COMPOUNDS
·
2017
·
IF 3.133
Long Zou,Yan Qiao,Shuang Gu,Yunhong Huang,Canyu Zhong,Zhong-er Long
The development of low-cost, scalable and realistic electrodes with robust catalytic activity and stability remains a great challenge for large-scale hydrogen production from electrochemical water splitting. Herein, we firstly reported a 3D self-supported porous hydrogen evolution cathode constructed by in-situ growth of nano-porous molybdenum carbide (Mo 2 C) nanoflakes on a commercial graphite felt (GF) through a facile electrostatic self-assembly followed by high-temperature carburization approach. Owing to a synergistic effect from high activity of nano-porous Mo 2 C and rich macroporous architecture of GF for fast diffusion of electrolyte and generated hydrogen bubbles, the 3D Mo 2 C@GF hybrid electrode only needs a low overpotential of 124 and 129 mV to deliver a cathodic current density of 10 mA cm −2 in 0.5 M H 2 SO 4 and 1 M KOH solution, respectively. Particularly, the strong incorporation of nano-Mo 2 C onto graphite fibers promotes interfacial electron transfer and enables superior stability and durability in both acidic and basic electrolyte. This work provides a proof of concept and design rules for developing truly workable electrodes with promising potential in practical hydrogen evolution.
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
Molecular Catalysis
·
2023
·
IF 4.6
Muyao Li,Zhaolian Zhu,Shiyu Yuan,Liya Ji,Tianhe Zhao,Yan Gao,Hailing Wang
In order to improve the efficiency and reusability of gas diffusion electrodes for hydrogen peroxide (H 2 O 2 ) electrosynthesis, we modified the graphite felt with nitric acid and constructed nitrogen-oxygen co-doped graphite felt/polytetrafluoroethylene/gas diffusion electrodes. The graphite felts before and after nitric acid modification were characterized by SEM, contact angle measurements, FTIR, and XPS, which showed that nitric acid modification resulted in a significant increase of oxygen- and nitrogen-containing functional groups (such as carboxyl groups and pyridinic nitrogen), which could improve the H 2 O 2 yield and current efficiency. The H 2 O 2 yield of the electrode prepared under the optimized modification conditions can reach 42.2 mg·L −1 ·cm −2 , and the current efficiency can be maintained at about 80.0%. The electrode shows relatively stable performance of H 2 O 2 electrogeneration during 13 cycles, and has a promising application prospect.
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
IONICS
·
2025
·
IF 2.6
Li Runze,Guo Yang,Yuan Shiling,Liu Gang,Lin Meng
Iron-chromium flow battery is considered one of the preferred technologies for large-scale energy storage facilities due to its advantages of low pollutability, less cost and high safety. However, the poor reversibility of the Cr 3+ /Cr 2+ redox reaction at the anode of iron-chromium flow batteries, the low activity and the susceptibility to hydrogen evolution reaction are the primary problems that restrict the development and application of this battery. On the basis of graphite felt electrodes, we prepared bismuth-lead oxides co-modified graphite felt electrodes via acid etching and electrodeposition method to improve the electrochemical performance in the reaction kinetics. The structural and catalytic properties of the materials were characterized and evaluated by scanning electron microscopy, X-ray photoelectron spectroscopy, X‐ray diffraction spectroscopy and electrochemical methods, respectively. The results show that with the help of the interaction between Bi and Pb elements, the successfully prepared modified electrode not only improves the reversibility and reaction rate of the electrochemical redox reaction of Cr 3+ /Cr 2+ but also effectively inhibits the occurrence of hydrogen evolution reaction.
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
CHEMOSPHERE
·
2019
·
IF 5.108
Bin Ou,Jixiao Wang,Ying Wu,Song Zhao,Zhi Wang
The graphite felt (GF) was modified through the concentrated sulfuric acid , potassium permanganate and ammonia activation with the aim of improving the specific surface area, hydrophilicity and the electrocatalytic activity for the electrogeneration of hydrogen peroxide and its application in the electro-Fenton (EF). The modified graphite felt (M-GF) was characterized by contact angle, scanning electron microscope , X-ray photoelectron spectroscopy, Raman spectrum , cyclic voltammetry and electrochemical impedance spectroscopy. The surface physic-chemical characteristics and morphology of the M-GF were considerably changed after the modification. The current efficiency for H 2 O 2 generation was explored at an optimized current density of 10 mA cm −2 and the value of H 2 O 2 generation for the M-GF was 478.6 mg L −1 , while the GF was 276.5 mg L −1 after 360 min of electrolysis. Finally, the M-GF was used for the mineralization of aniline (100 mg L −1 ), reaching a mineralization percentage of 97% with EF process. The M-GF demonstrated good stability as the aniline mineralization percentage was above 90% after 10 cycles’ degradation, indicating that the M-GF is a promising cathode material for improving the degradation and mineralization of others organic pollutants by the EF process.
研究领域:
环境科学
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材料科学
✓ 已验证
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Heng Wu,Sen Li,Yujuan Chen,Lei Huang,Huifang Zhao,Xiaofang Yu,Xianglin Pei
H 2 O 2 is the cornerstone of the modern chemical industry and has a wide range of applications. Graphite felt coated with carbon oxide black can be used as an efficient cathode material to produce H 2 O 2 . The electrode can be used to remove Hg 0 in the gas phase. Through the characterization of the catalyst, it was observed that oxidized carbon black has more functional groups and defects than carbon black. The increase of −C = O can promote oxygen reduction reaction, and then produce H 2 O 2 through electrochemical two-electron oxygen reduction, and finally show better Hg 0 removal performance. The oxidative removal of Hg 0 was 81.5 % after 60 min at current density = 9.2 mA/cm 2 , electrolyte concentration = 0.06 mol/L and pH = 4.6. which is 33.5 % higher than that of original graphite felt, and it still has good stability and repeatability after 7 repetitions. At the same time, DFT calculation revealed that the incorporation of CB into C = O promoted the conversion of O 2 to H 2 O 2 . Finally, this study opens up a new way for efficient, rapid, green, clean, and sustainable removal of Hg 0 from the gas phase.
研究领域:
环境科学
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电化学
✓ 已验证
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2017
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IF 3.387
Zhangxing He,Yingqiao Jiang,Wei Meng,Fengyun Jiang,Huizhu Zhou,Yuehua Li,Jing Zhu,Ling Wang,Lei Dai
In order to improve the electrochemical performance of the positive graphite felt electrode in vanadium flow redox battery, a novel method is developed to effectively modify the graphite felt by combination of etching of HF and oxidation of H 2 O 2 . After the etching of HF for the graphite felt at ambient temperature, abundant oxygen-containing functional groups were further introduced on the surface of graphite felt by hydrothermal treatment using H 2 O 2 as oxidant. Benefiting from the surface etching and introduction of functional groups, mass transfer and electrode process can be improved significantly on the surface of graphite felt. VO 2+ /VO 2 + redox reaction on the graphite felt modified by HF and H 2 O 2 jointly (denote: GF-HF/H 2 O 2 ) exhibits superior electrochemical kinetics in comparison with the graphite felt modified by single HF or H 2 O 2 treatment. The cell using GF-HF/H 2 O 2 as the positive electrode was assembled and its electrochemical properties were evaluated. The increase of energy efficiency of 4.1% for GF-HF/H 2 O 2 at a current density of 50 mA cm −2 was obtained compared with the pristine graphite felt. The cell using GF-HF/H 2 O 2 also demonstrated higher discharge capacity. Our study revealed that HF/H 2 O 2 treatment is an efficient method to enhance the electrochemical performance of graphite felt, further improving the comprehensive energy storage performance of the vanadium flow redox battery.
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
CHEMOSPHERE
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2021
·
IF 7.086
Zejun Liu,Jinquan Wan,Yongwen Ma,Yan Wang
The traditional Electro-Fenton (EF) is an efficient technology for wastewater treatment but suffers from the acidic condition requirement and external catalyst addition. To overcome these challenges, a GF@MoS 2 @FeOCl cathode was fabricated using a facile method. The as-prepared GF@MoS 2 @FeOCl cathode showed excellent performance for ciprofloxacin (CIP) degradation in EF process with RuO 2 /Ti electrode as the anode. H 2 O 2 was electro-generated and activated on-site at the cathode at mild pH without adding Fe 2+ . CIP was 100% removed with 74.4% of mineralization in 90 min at pH 6. The GF@MoS 2 @FeOCl cathode exhibited good reusability after consecutive runs of degradation. The degradation intermediates were investigated, and the possible mechanism was proposed. This work demonstrated that the prepared GF@MoS 2 @FeOCl cathode is a promising candidate for contaminants treatment in an EF system.
研究领域:
环境科学
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材料科学
·
污水处理
✓ 已验证
DOI
PubMed
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2020
·
IF 5.774
Yun Xue,Meng Cao,Jianzhang Gao,Yunyang Gui,Jiaqi Chen,Peng Liu,Fuqiu Ma,Yongde Yan,Min Qiu
Electrode materials have an important influence on the performance of electroadsorption. In this paper, Polyacrylonitrile was introduced to the graphite surface by coating method, then amidoxime reaction was carried out by one-step hydrothermal method. The results of material analysis showed that the nitrile group were transformed to amidoxime group and the electrode had good thermal stability. The electrochemical test results demonstrated that the amidoxime-modified graphite felt electrode displayed a good specific capacitance of 46.5 F·g −1 in 1 M NaCl solution at a scan rate of 5 mV·s −1 . The results of batch adsorption experiments showed that the adsorption capacity of uranium could reach 164.75 mg·g −1 at −0.9 V (vs SCE). When sodium carbonate was used as eluent, the elution efficiency was 95% under the influence of reverse voltage (0.9 V). The adsorption capacity could reach 90% of the initial value after 5 times of reuse. The results indicated that the amidoxime-modified graphite felt had a good application prospect for removing uranium from water by electroadsorption method.
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
JOURNAL OF HAZARDOUS MATERIALS
·
2020
·
IF 9.038
Weikang Lai,Zhuoyao Chen,Shengjun Ye,Yanbin Xu,Guangyan Xie,Chaozhi Kuang,Yuxin Li,Li Zheng,Longmeng Wei
In this research, bismuth vanadate-doped graphite felt (GF-BiVO 4 ) was successfully prepared by sol–gel method, in which BiVO 4 owned superior electro-Fenton (EF) and solar-photo-electro-Fenton (SPEF) performance. Combined with the analysis by X-ray diffractometer (XRD), field emission transmission electron microscopy (FE-TEM), nitrogen adsorption–desorption isotherms and cyclic voltammetry (CV), the changes of electrodes were reflected in structure and physicochemical properties . The doping of monoclinic BiVO 4 endued GF with a higher surface area and more electro-active sites and better electrode activity in comparison to Raw-GF. Then, the GFs were used as cathodes to detect •OH concentration with coumarin (COU) as probe molecule and to evaluate photoelectric performance with ciprofloxacin (CIP) in photocatalysis , EF and SPEF processes. The results demonstrated that the concentration of •OH followed an order of SPEF > EF > photocatalysis, which was consistent with the removal rate of CIP (99.8%, 99.4% and 21.2%, respectively) on GF-BiVO 4 at 5 min. Further, five degradation pathways of CIP in SPEF system were proposed including the attack on piperazine ring, oxidation on cyclopropyl group, decarboxylation and hydroxyl radical addition, oxidation on benzene group and defluorination . The study provides insights into the enhancement of EF and SPEF performance and the degradation pathway of CIP in SPEF.
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
NEW JOURNAL OF CHEMISTRY
·
2022
·Vol. 46
·期 26
·12696-12702
·
IF 3.925
Jiaman Liu,Jiping Jia,Huaqiang Yu,Jialin Zhang,Ji Li,Honghua Ge,Yuzeng Zhao
Nanoporous carbon (NPC) with microporous, mesoporous, and macroporous composite structures was designed and a new electro-Fenton cathode material was prepared by loading NPC onto graphite felt (GF) in this paper. The surface morphology and electrochemical properties of this material have been analyzed. The results show that the NPC obtained by carbonizing the composite of multi-walled carbon nanotubes and zeolite imidazole skeleton-8 has rich porosity and large specific surface area, which promotes the two-electron oxygen reduction reaction. Compared with the original GF, the NPC/GF electrode loaded with NPC has a higher current response and a lower charge transfer resistance. This modification has significantly improved the performance of the cathode to produce H2O2. Under the optimum conditions, the H2O2 yield of the NPC/GF electrode is about 17 times higher than that of the original GF and the degradation rate of acid red 18 (AR 18, 100 mg L−1) can reach 98.18% within 2 hours. After eight cycles, the H2O2 output of the NPC/GF cathode did not decrease significantly and the degradation rate of AR18 was still higher than 95%, indicating that the NPC/GF electrode has good reusability and certain practical value.
研究领域:
材料科学
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环境工程
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电化学
✓ 已验证
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2011
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IF 3.65
Qiang Ma,Tao Liu,Tiantian Tang,Huanshun Yin,Shiyun Ai
The electrochemical inactivation of microorganisms by a hemin/graphite felt (GF) composite electrode was investigated, and Escherichia coli was treated as the testing species. The composite electrode was constructed by chemically bonding hemin molecules onto an amino-mineralized GF (AGF) surface. Then, the electrode was characterized systematically by electrochemical methods, and the kinetic parameters of the modified electrode were investigated. The hemin molecules on the surface of the composite electrode have high activity for the reduction of O 2 . When the composite electrode was applied with negative potentials, the dissolved oxygen was electrochemically reduced to reactive oxygen species (ROS, such as H 2 O 2 and OH) at the cathode surface. The ROS can cause biological damage and can eventually result in the death of bacteria. A sterilizing rate up to 99.9% could be obtained after 60 min of inactivation. Thus, this composite electrode could be applied to disinfect drinking water efficiently at a low potential (−0.6 V vs. SCE) without any addition of chloride.
研究领域:
环境科学
·
微生物学
·
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）