International Journal of Environmental Research and Public Health
·
2022
·Vol. 19
·期 23
·15688
·
IF 4.614
Yifan Yao,Kai Zhu,Yucan Liu,Qianjin Liu,Lihua Huang
In this study, tartrazine solutions were oxidized using innovative electrochemical advanced oxidation processes (EAOPs) that combined persulfate (PS) activation with electrogenerated H2O2, cathodic reduction and anodic oxidation at Pt and BDD anodes, and graphite cathode in an undivided stirred reactor. For the Pt anode, SO4·−was generated from a reduction reaction at the cathode and a reaction between the PS and electrogenerated H2O2. For the BDD anode, SO4·−was generated from a reduction reaction at the cathode, an oxidation reaction at the anode, and a reaction between PS and electrogenerated H2O2. Among these activation methods, the activation efficiency of PS by electrogenerated H2O2is much better than other methods. The effects of PS concentration up to 36 mM, applied current density between 6 to 15 mA cm−2,and temperatures between 25 to 45 °C were investigated. For the electro-Fenton process with Pt anode (Pt-H2O2/PS process), the best result for oxidizing 250 mg L−1tartrazine solution was obtained with 37.5 mM Na2SO4+ 9.0 mM Na2S2O8, applied current density at 12 mA cm−2and 45 °C, acquiring total color removal after 30 min reaction. For the electro-Fenton process with BDD anode (BDD-H2O2/PS process), the best result for oxidizing 250 mg L−1tartrazine solution was obtained with 25 mM Na2SO4+ 18 mM Na2S2O8, applied current density at 12 mA cm−2and 45 °C, yielding 100% color removal after 30 min reaction. The main oxidizing agents are SO4·−and OH·in the anodic oxidation process with PS and the electro-Fenton process with PS. It is concluded that the additions of PS tremendously improve the oxidation power of electro-Fenton processes with PS, especially the Pt-H2O2/PS process.Keywords:anodic oxidation;electrogenerated H2O2;persulfate;hydroxyl radical;sulfate radical
研究领域:
环境科学
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化学工程
·
水处理
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产品关联
DOI
PubMed
高影响因子
ELECTROCHIMICA ACTA
·
2020
·
IF 6.215
Jing Wang,Tong Zheng,Huiling Liu,Gang Wang,Yanxiang Zhang,Chen Cai
In this study, the electrochemical generation of ferrate (Fe(VI)) from grey cast iron anode in sodium hydroxide (NaOH) solution was utilized in situ to degrade the malodorous pollutant of ethanethiol (C 2 H 5 SH). During electrolysis, C 2 H 5 SH was oxidized by the combination of direct anodic oxidation and Fe(VI) oxidation (indirect oxidation). The direct anodic oxidation process, which played an important role in the decontamination process but was often disregarded in related studies, was investigated in detail. The electrochemical generation of Fe(VI) was investigated, and the maximum current efficiency of Fe(VI) generation was obtained in 14 M NaOH solution. The voltammetry studies of the grey cast iron anode in NaOH solutions containing and without C 2 H 5 SH revealed that the dissolution of anode was improved in the presence of C 2 H 5 SH. A decrease in NaOH concentration increased the contribution of direct anodic oxidation but decreased the electrochemical generation of Fe(VI). C 2 H 5 SH was degraded on the grey cast iron anode at a higher rate in less concentrated NaOH solution ( k = 4.15 × 10 −2 min −1 in 2 M NaOH solution), which could be ascribed to the enhancement in direct anodic oxidation as well as in the oxidizing power of Fe(VI). Higher current density promoted the degradation rate of C 2 H 5 SH in both direct and indirect oxidation processes, but it also decreased the current efficiency due to the improvement of the side reactions. Additionally, the in-situ and on-line applications of the electrochemical generated Fe(VI) in recent studies were presented and discussed. This study provides a comprehensive understanding of C 2 H 5 SH oxidation on grey cast iron anode, and offers a feasible electrochemical scrubbing approach using grey cast iron as the anode for C 2 H 5 SH odors control.
研究领域:
环境科学
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电化学工程
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DOI
高影响因子
Small
·
2024
·Vol. 20
·期 34
·2402108
·
IF 13
Shan Fang,Huasong Wang,Shangquan Zhao,Miaomiao Yu,Xiang Liu,Yong Li,Fanglin Wu,Wenhua Zuo,Naigen Zhou,Gregorio F. Ortiz
Lithium metal is a highly promising anode for next-generation high-energy-density rechargeable batteries. Nevertheless, its practical application faces challenges due to the uncontrolled lithium dendrites growth and infinite volumetric expansion during repetitive cycling. Herein, a composite lithium anode is designed by mechanically rolling and pressing a cerium oxide-coated carbon textile with lithium foil (Li@CeO 2 /CT). The in situ generated cerium dioxide (CeO 2 ) and cerium trioxide (Ce 2 O 3 ) form a heterojunction with a reduced lithium-ion migration barrier, facilitating the rapid lithium ions migration. Additionally, both CeO 2 and Ce 2 O 3 exhibit higher adsorbed energy with lithium, enabling faster and more distributed interfacial transport of lithium ions. Furthermore, the high specific surface area of 3D skeleton can effectively reduce local current density, and alleviate the lithium volumetric changes upon plating/stripping. Benefiting from this unique structure, the highly compact and uniform lithium deposition is constructed, allowing the Li@CeO 2 /CT symmetric cells to maintain a stable cycling for over 500 cycles at an exceptional high current density of 100 mA cm −2 . When paired with LiNi 0.91 Co 0.06 Mn 0.03 O 2 (NCM91) cathode, the cell achieves 74.3% capacity retention after 800 cycles at 1 C, and a remarkable capacity retention of 81.1% after 500 cycles even at a high rate of 4 C.
研究领域:
材料科学
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电化学
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产品关联
DOI
PubMed
高影响因子
ELECTROCHIMICA ACTA
·
2021
·
IF 6.901
Juping You,Han Chen,Liangliang Xu,Jingkai Zhao,Jiexu Ye,Shihan Zhang,Jianmeng Chen,Zhuowei Cheng
Microbial fuel cell (MFC) is an innovative technology to stimulate the anaerobic degradation of hydrocarbons and recover their chemical energy. Typically, for the hydrocarbon oxidation, its performance depends upon the activity of the bioanode. In this work, four anodic potentials pertained to the redox of four different membrane proteins of the microbes, namely -0.52, -0.35, -0.16, and 0.17 V vs. Ag/AgCl, were applied to tune the bioanode. Experimental results revealed that, the more negative the bioanode potential was, the more obvious the enhancement became. The biofilm tuned at -0.35 V exhibited a highest toluene removal efficiency of 99% (800 mg/m 3 ), and a maximum power density of 8.97 mW/m 2 with the Coulomb efficiency of 2.06%. The microbial community analysis indicated that the dominant microbes in the bioanode were Comamonas sp., Petrimonas sp., Sedimentibacter sp., Ignavibacterium sp. and Parachlamydia sp., which was almost unaffected by the applied anodic potentials. The cyclic voltammetry analysis showed that the bioanode tuned at 0.17, -0.16 and -0.35 V exhibited three completely different electron transfer pathways. Furthermore, three metabolic pathways with o -cresol as an intermediate were proposed under the four applied anodic potentials. These results demonstrated that the anodic potential acclimation offers an effective enhancement method for the gaseous toluene removal combined with power generation.
研究领域:
环境科学
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微生物学
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DOI
高影响因子
APPLIED ENERGY
·
2019
·
IF 8.426
Heping Xie,Shuo Zhai,Bin Chen,Tao Liu,Yuan Zhang,Meng Ni,Zongping Shao
Hybrid direct coal fuel cells (HDCFCs) have the potential to convert coal into electrical power in a clean and efficient manner. However, the related coal pretreatment method and the anode activity should both be improved, before the HDCFCs could match the performance of other direct coal fuel cells such as those based on solid oxide. In this study, we pyrolysed bituminous coal at 800 °C followed by modification with acetic acid, in order to remove organic volatiles and reintroduce surface functional groups, respectively. The result was a modified char that was highly pure and with high oxidation activity. Further, the Ni-(Y 2 O 3 ) 0.08 (ZrO 2 ) 0.92 anode was infiltrated with Ag nanoparticles as an effective catalyst to promote the electro-oxidation of carbon. Under optimised conditions, the HDCFC with Ag-infiltrated anode and modified char as fuel demonstrated a maximum power density (403 mW cm −2 at 750 °C) that exceeds previous results for coal-based fuels. The cell also showed stable operation for 14 h, with a fuel conversion of 97.22% and Faradic efficiency of 61.06% using 0.4 g modified char.
研究领域:
能源科学
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材料科学
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化学工程
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
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2022
·
IF 10.319
Bofang Tian,Zhenxin Huang,Xilian Xu,Xiehong Cao,Hui Wang,Tingting Xu,Dezhi Kong,Zhuangfei Zhang,Jie Xu,Jinhao Zang,Xinjian Li,Ye Wang
Although lithium metal and sodium metal are promised as ideal anodes for lithium ion batteries (LIBs) and sodium ion batteries (SIBs), they still suffer from inevitable dendrite growth. In light of this, silver nanoparticles (Ag NPs) are sputtered onto three-dimensional carbon nanotube decorated graphene foam (3D CNT-GF) to construct superior 3D Ag/CNT-GF composite matrix for lithium metal anodes (LMAs) and sodium metal anodes (SMAs). With this design, lithiophilic/sodiophilic Ag NPs could provide favorable sites to guide Li/Na metal nucleation and growth, thus leading to low nucleation overpotentials, high Coulombic efficiency and long cycle performance. Accordingly, 3D Ag/CNT-GF electrodes can stably cycle for 1000 and 750 cycles at 3 mA cm −2 with 1 mAh cm −2 for SMAs and LMAs, respectively. More attractively, it can also stably sustain 300 cycles (SMAs) and 500 cycles (LMAs) at a large current density of 5 mA cm −2 with 1 mAh cm −2 . The excellent electrochemical performance can be attributed to the lithiophilic/sodiophilic electrode surface, 3D porous electrode structure and the dendrite-free morphology as demonstrated by ex-situ scanning electron microscopy (SEM) and in-situ optical microscopy analyses. Furthermore, full cells based on Na@3D Ag/CNT-GF||Na 3 V 2 (PO 4 ) 3 @carbon (NVP@C) and Li@3D Ag/CNT-GF||LiFePO 4 (LFP) could deliver highly reversible capacities of 90.1 and 106.4 mAh g −1 , respectively, at 100 mA g −1 after 200 cycles for SIBs and LIBs, respectively. This work demonstrates a novel 3D Ag/CNT-GF matrix for boosting Li/Na deposition stability for their future applications.
研究领域:
材料科学
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电化学
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能源存储
✓ 已验证
产品关联
DOI
高影响因子
CHINESE JOURNAL OF CATALYSIS
·
2018
·Vol. 38
·期 12
·2132-2140
·
IF 3.525
Lingfeng Li,Xiaolong Zhao,Donglai Pan,Guisheng Li
Photoactive WO 3 is attractive as a photocatalyst for green energy evolution through water splitting. In the present work, an electrochemical anodic oxidation method was used to fabricate a photo-responsive nanotube array-like WO 3 /W (NA-WO 3 /W) photoanode from W foil as a precursor. Compared with a reference commercial WO 3 /W electrode, the NA-WO 3 /W photoanode exhibited enhanced and stable photoelectrocatalytic (PEC) activity for visible-light-driven water splitting with a typical H 2 /O 2 stoichiometric ratio of 2:1 and quantum efficiency of approximately 5.23% under visible-light irradiation from a light-emitting diode ( λ = 420 nm, 15 mW/cm 2 ). The greatly enhanced PEC performance of the NA-WO 3 /Wphotoanode was attributed to its fast electron–hole separation rate, which resulted from the one-dimensional nanotube array-like structure, high crystallinity of monoclinic WO 3 , and strong interaction between WO 3 and W foil. This work paves the way to a facile route to prepare highly active photoelectrodes for solar light transfer to chemical energy .
研究领域:
材料科学
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物理化学
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能源化学
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纳米科技
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光催化
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电化学
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可再生能源
✓ 已验证
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
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2016
·
IF 4.758
Guo Chen,Xia Hao,Bang Lin Li,Hong Qun Luo,Nian Bing Li
In this work, a simple and reliable electrochemical method for the determination of cadmium using an antimony film modified sodium montmorillonite (NaMM) doped carbon paste electrode (Sb/NaMM-CPE) was described. Due to the strong cation exchange ability and adsorptive characteristics of NaMM and excellent electroanalytical performance of the antimony film, the new electrode significantly enhanced the sensitivity for detection of Cd(II) and exhibited superior performance in comparison with the bare carbon paste electrode, antimony film modified carbon paste electrode (Sb/CPE), and NaMM modified carbon paste electrode (NaMM-CPE). Some parameters such as the composition of the paste, pH of the measure solution, the Sb(III) concentration, deposition time, and deposition potential that influenced the response of cadmium were investigated and the procedure was optimized for cadmium determination. This electrode, combined with square-wave anodic stripping voltammetry, displayed excellent linear behavior in the examined concentration range of 4.0–150.0 μg L −1 Cd(II) ( R 2 = 0.998) with a detection limit of 0.25 μg L −1 . The Sb/NaMM-CPE was successfully applied to the determination of cadmium ion in tap water sample.
研究领域:
电化学
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分析化学
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MOLECULAR LIQUIDS
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2024
·
IF 5.3
Shaolong Li,Zepeng Lv,Jilin He,Jianxun Song
ZrC x O y with composition ZrC 0.79 O 0.21 were synthesized through the carboreduction of ZrO 2 in this paper. Subsequently, these ZrC x O y blocks obtained through reaction sintering were directly subjected in a graphite crucible as an anode for electrolysis preparation of metallic zirconium in NaCl-KCl melt. The effects of applied voltage, fluoride ions, and initial zirconium ion content on anodic dissolution were studied, as well as the cathodic deposition. The results indicate that the valence state of zirconium ions dissolved into the molten salt from the anode will rise with the voltage increasing from 2.7 V to 3.1 V. In addition to voltage, both fluoride ions and initial zirconium ions have significant effects on the anodic dissolution of ZrC x O y and cathodic deposition of zirconium. The microstructure of cathodic deposition products also exhibits diversity with changes in electrolysis conditions. The experimental results supply evidence for the electrolysis of ZrC x O y obtained through reaction sintering as a consuming anode for the preparation of metallic zirconium, while also providing support for the optimization of electrolysis parameters.
研究领域:
材料科学
·
冶金工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
·
2024
·Vol. 171
·期 12
·122505
·
IF 3.1
Dongsheng Jiang,Zhuan Zhao,Huan Zhang,Ruifang Wang,Jianxun Song,Yusi Che,Jilin He
In this study, metallic niobium was produced by electrolysis in a NaCl-KCl melt using NbCxOy as a soluble anode. The anodic dissolution behavior of NbCxOy in the NaCl-KCl melt and the reduction mechanism of niobium ions were examined using cyclic voltammetry, linear sweep voltammetry, square wave voltammetry, electrochemical impedance spectroscopy, and chronopotentiometry. The results revealed that the electrode reduction process of niobium ion was Nb(Ⅴ) → Nb(Ⅲ) → Nb(Ⅰ) → Nb, with these reactions being diffusion-controlled. During successive multiturn scans, the reduction process of niobium ions favored the pathway of Nb(V) → Nb(III) → Nb. As the electrolytic voltage increased, the dissolution of niobium ions in NbCxOy also increased, with a tendency to oxidize into high-valence niobium ions. Constant-current electrolysis in a NaCl-KCl melt, using NbCxOy as the anode and Mo rods as the cathode resulted in the deposition of mainly metallic niobium on the Mo cathode, manifesting that NbCxOy can be used to extract metallic niobium. This study provides a theoretical foundation for the realization of a green and efficient extraction process for metallic niobium.
研究领域:
冶金学
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电化学工程
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产品关联
DOI
高影响因子
Advanced Energy Materials
·
2019
·Vol. 9
·期 15
·1803627
·
IF 24.884
Dongjiang Chen,Ziqi Zhou,Chao Feng,Weiqiang Lv,Zhaohuan Wei,Kelvin H. L. Zhang,Bin Lin,Songhao Wu,Tianyu Lei,Xuyun Guo,Gaolong Zhu,Xian Jian,Jie Xiong,Enrico Traversa,Shi Xue Dou,Weidong He
Structural/compositional characteristics at the anode/electrolyte interface are of paramount importance for the practical performance of lithium ion batteries, including cyclic stability, rate capacity, and operational safety. The anode-electrolyte interface with traditional separator technology is featured with inevitable phase discontinuity and fails to support the stable operation of lithium ion batteries based on large-capacity anodes with structural change in charges/discharges, such as transition metal oxide anodes. In this work, an anode/electrolyte framework based on an oxide anode and an active-oxide-incorporated separator is proposed for the first time and investigated for lithium ion batteries. The architecture builds a robust anode-separator interface in LIBs, shortens Li + diffusion path, accelerates electron transport, and mitigates the volume change of the oxide anode in electrochemical reactions. Remarkably, 4 wt% CuO addition in the separator leads to a 17% enhancement in the overall capacity of a battery with a CuO anode. The battery delivers an unparalleled record reversible capacity of 637.2 mAh g −1 with a 99% capacity retention after 100 charge/discharge cycles at 0.5 C. The high performance are attributed to the robust anode-separator interface, which gives rise to enhanced interaction between the oxide anode and the same-oxide-incorporated composite in the separator.
研究领域:
材料科学
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电化学
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能源存储
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纳米材料
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功能高分子
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界面工程
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电极设计
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Sicheng Zhang,Tengfei Duan,Dejian Yan,Hongyun Yang,Lingling Cheng,Yong Pei,Kuiyi You,He'an Luo
Charge recombination at the interface of oxygen evolution catalyst (OEC) and BiVO 4 -based photoanode is one of the great challenges to achieve efficient photoelectrochemical (PEC) water splitting due to the poor charge transfer and separation efficiency of BiVO 4 . Herein, a composite photoanode (NiFe/C-Mo:BiVO 4 ) consisting of a molybdenum doped BiVO 4 photoanode, an OEC interfacial layer of NiFeOOH and a tailorable hole transfer layer (HTL) made of glucose-derived carbon in between, was designed and fabricated for highly efficient PEC water splitting. The composite NiFe/C-Mo:BiVO 4 photoanode exhibited the photocurrent density of 5.62 mA cm −2 at 1.23 V RHE and an outstanding photo-stability. Characterization and photoelectrochemical analyses revealed that the inserted carbon HTL, though not active for surface water oxidation kinetics, greatly suppressed the unwanted recombination of electron-hole pairs and drastically improved the transfer and storage of charge carriers at the OEC/BiVO 4 interface. A surface charge separation efficiency of 89 % at 1.23 V RHE and remarkable hole storage properties were obtained. This work afforded a novel approach to the design of low-cost and sustainable HTL integrated photoanodes for efficient PEC water oxidation.
研究领域:
材料科学
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能源科学
✓ 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）