CARBOHYDRATE POLYMERS
·
2015
·
IF 4.074
Pingping Li,Hongliang Kang,Chao Zhang,Weiwei Li,Yong Huang,Ruigang Liu
Novel ferrocene functionalized hydroxypropyl cellulose (HPC-Fc) were prepared by azide-alkyne cycloaddition and characterized. HPC-Fc exhibits an excellent reversible redox activity and could establish amazing electron transfer ability between enzyme and electrode. HPC-Fc and horseradish peroxidase (HRP) were coated on a platinized carbon electrode to prepare an amperometric biosensor for hydrogen peroxide (H 2 O 2 ) detection. The amperometric response was measured as a function of H 2 O 2 concentration at a fixed potential of 0.35 V in 100 mM phosphate buffer solution (pH 7.0). The novel biosensor exhibits a fast linear response toward H 2 O 2 in the range of 0.1–8 μM with sensitivity of 4.21 nA/μM. Moreover, the enzyme assays measured by the spectrophotometer method confirm that abundant hydroxyl groups of HPC backbones are conductive for HRP to maintaining or even enhancing their activity. The redox active HPC - Fc with the unique properties of both ferrocene and cellulose is a good candidate for biosensor applications.
研究领域:
生物化学
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材料科学
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分析化学
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DOI
高影响因子
Energy Storage Materials
·
2023
·
IF 20.4
Lu Wei,Yu Chen,Ziliang Huang,Sheng Zheng,Xin Guo
Aqueous zinc-ion energy storage devices with high safety standards attract extensive interests. Among them, aqueous zinc-ion hybrid capacitors (ZICs) feature the merits of low cost, high power and long cycle life. However, the low operating voltages of aqueous electrolytes, and capacity mismatch between the capacitive cathode and the zinc metal anode, result in limited energy outputs of ZICs. Herein, synergic effects between polymer molecular crowding agent [poly(ethylene glycol)] and redox active ions (3Br ‒ /Br 3 ‒ ) are utilized to construct high voltage active aqueous electrolytes with low salt concentration (1.5 m). The molecular interaction mechanism for the proposed active aqueous electrolyte system is investigated by using a variety of experimental and theoretical simulation techniques. The aqueous electrolyte presents a wide electrochemical stability window (3.32 V) through confining water molecules in polymer chains, and meanwhile introduces extra faradaic contributions at activated carbon cathode. The assembled ZIC delivers an energy density up to 353 Wh kg −1 , which is comparable to that of aqueous zinc-ion batteries. Owing to the physical adsorption (van der Waals force) of oxidized Br 3 ‒ on the surface of activated carbon, retarded self-discharge (with an energy retention efficiency of 73.8% after 10 h) is achieved for the ZIC. This work offers a feasible strategy for exploring ZICs and other aqueous hybrid supercapacitors with boosted energy density, concurrently maintaining reasonable rate capability and cycling stability.
研究领域:
能源材料
·
电化学
✓ 已验证
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2019
·Vol. 43
·期 47
·18935-18942
·
IF 3.069
Cheng-Long Geng,Le-Qing Fan,Chun-Yan Wang,Yong-Lan Wang,Si-Jia Sun,Ze-Yu Song,Na Liu,Ji-Huai Wu
To increase the energy density of quasi-solid-state supercapacitors, a redox-active gel polymer electrolyte (GPE) was prepared by evaporating the excess water in a neutral gel that consists of polyvinyl alcohol (PVA), Na2SO4 and the ionic liquid (IL) N-butyl-N-methylpyrrolidinium bromide (Pyr14Br). The influence of IL Pyr14Br on the ionic conductivity of GPE was investigated. The maximum ionic conductivity of PVA–Na2SO4–Pyr14Br GPE can reach 27.1 mS cm−1. The optimized GPE was assembled with two activated carbon electrodes into a quasi-solid-state supercapacitor. The electrochemical performances of this supercapacitor were evaluated by cyclic voltammetry, galvanostatic charge/discharge, electrochemical impedance spectroscopy and self-discharge measurements. The assembled supercapacitor exhibits a high energy density of 33.0 W h kg−1, which is due to the wide working voltage (2.0 V) as a result of the strong solvation of Na+ cations and SO42− anions and the production of an additional pseudocapacitive contribution from the Br−/Br3− redox reaction at the electrolyte/electrode interface. This supercapacitor exhibits outstanding cyclic stability with an 81.0% capacitance retention ratio after 8000 charge/discharge cycles. Moreover, this supercapacitor presents good self-discharge behavior.
研究领域:
材料科学
·
电化学
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产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2025
·
IF 9.7
Jun Yang,Xinran Zhao,Jinyang Peng,Jiachen Yang,Minjie Shi,Liqiu Zhang,Chao Yan
Redox-active organic compounds with tailored conjugated architectures have gained prominence as pivotal electrode materials in aqueous batteries , owing to their unique ion (de)intercalation mechanisms that avoid crystalline lattice distortion during redox processes . Despite their potential, organic materials are hindered by limitations including inadequate active site density and structural degradation due to electrolyte dissolution during electrochemical cycling. Addressing these limitations, we develop an innovative electron-delocalized organic molecule, designated as PTAQ, which incorporates a π-conjugated imidazole-linked framework with extensive electron delocalization and a reduced band gap, which is favorable for electron transfer . Additionally, a new redox active group (C N) was added, and the amount of C O was increased, thereby enhancing ion embedding capability, as validated by in-situ analyses and theoretical calculations. As electrode for aqueous ammonium-ion batteries (AAIBs), PTAQ exhibits a high specific capacity of 220.9 mAh g −1 (at 1 A g −1 ) with wide operating voltage (−0.9–1.0 V) and maintains a capacity retention of 98.8 % after 10,000 cycles at 5 A g −1 . Furthermore, an all-organic PTAQ//polyimide full cell was constructed, demonstrating a specific capacity of 65.6 mAh g −1 at 1 A g −1 over 200 cycles, with an impressive capacity retention rate of 94.2 %. This work advances the understanding of NH 4 + storage mechanisms in organic materials while establishing molecular engineering strategies for tailoring high-performance organic electrodes in aqueous ammonium-ion batteries (AAIBs). This enables technological innovation in sustainable energy storage systems with higher energy density .
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产品关联
DOI
PubMed
高影响因子
DESALINATION
·
2025
·
IF 9.8
Zhiqiang Wu,He Ren,Hao Zhou,Jianeng Ji,Haiyun Ding,Chunyan Li,Minjie Shi,Ying Hong,Jun Yang
Prussian Blue analogs (PBAs) have emerged as one of the promising materials for capacitive deionization (CDI) due to their excellent specific capacity and outstanding ion adsorption capability. However, Mn-based hexacyanoferrate Prussian Blue (MnHCF) suffers from insufficient utilization of active sites and poor ion kinetics during the electrochemical process, resulting in weak ion adsorption capacity and easy destruction of its stable structure. In this work, CuMnHCF was synthesized by incorporating Cu into the MnHCF framework via an in situ solvothermal approach. The appropriate introduction of Cu effectively occupied the interstitial sites of the MnHCF structure, optimized its electronic configuration, and successfully activated both the metal–N bonds and the Fe–CN dual redox-active sites within the framework (evidenced by in situ Raman measurements). These merits collectively led to a significant enhancement in the electrosorption capacity of CuMnHCF toward Na ions. The CuMnHCF electrode exhibits excellent cycling stability in aqueous NaCl electrolyte. After 5000 cycles, the specific capacitance decay is minimal, with a capacity retention rate of approximately 61.5% (5 A g −1 ). As applied in electrochemical desalination experiment at a voltage of 1.2 V for 50 cycles, the retention rate of CuMnHCF electrode reached as high as 82.2%. Additionally, it not only exhibits a high salt removal capacity of 58.4 mg g −1 (salt removal rate: 1.95 mg g −1 min −1 ), but also a peak salt removal rate of 15.7 mg g −1 min −1 . As an application extension, the CuMnHCF electrode also shows excellent desalination performance for K + , Ca 2＋ , and Mg 2 + .
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产品关联
DOI
高影响因子
Advanced Powder Materials
·
2024
·
IF 28.6
Miaoran Zhang,Tengyu Yao,Tiezhu Xu,Xinji Zhou,Duo Chen,Laifa Shen
The stable operation of supercapacitors at extremely low temperatures is crucial for applications in harsh environments. Unfortunately, conventional inorganic electrodes suffer from sluggish diffusion kinetics and poor cycling stability for proton pseudocapacitors. Here, a redox-active polymer poly (1,5-diaminonaphthalene) is developed and synthesized as an ultrafast, high-mass loading, and durable pseudocapacitive anode. The charge storage of poly (1,5-diaminonaphthalene) depends on the reversible coordination reaction of the C=N group with H + , which enables fast kinetics associated with surface-controlled reactions. The 3D-printed organic electrode delivers a remarkable areal capacitance (8.43 F cm −2 at 30.78 mg cm −2 ) and thickness-independent rate performance. Furthermore, the 3D-printed proton pseudocapacitor exhibits great low-temperature tolerance and delivers a high energy density of 0.44 mWh cm −2 at −60 °C, as well as operates well even at −80 °C. This work signifies that combining organic material design with 3D hierarchical network electrode construction can provide a promising solution for low-temperature-resistant supercapacitors.
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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功能高分子
·
纳米科技
✓ 已验证
DOI
高影响因子
Earth Systems and Environment
·
2025
·
IF 4.7
Irfan Muhammad,ul Hasan Israr Masood,Jafir Muhammad,Hu Jie,Li Chang,Moeen ud din Muhammad,Zhu Yixing,Hussain Khalid,Zheng Liugen
Arsenic (As) contamination in water supplies poses severe risks to human health and ecosystems, necessitating high-efficiency, regenerable, and cost-effective adsorbents. In this study, a bimetallic layered double hydroxide hybrid (MnFe-LDH/BC@H3BTC) was constructed using biochar (BC) and 1,3,5-benzenetricarboxylic acid (H3BTC) as a ligand-regulated structure for enhanced arsenite [As(III)] removal. MnFe-LDH/BC@H3BTC exhibited 99.4% As(III) removal at pH 7 within 2 h equilibrium, showed superior adsorption capacity (2.99 mgg −1 ) compared to MnFe-LDH (2.2 mgg −1 ) and MnFe-LDH/BC (2.58 mgg −1 ). Characterization (XRD, FTIR, 2D-COS, BET, and XPS) revealed synergistic contributions from redox-active Mn²⁺/Mn³⁺ and Fe²⁺/Fe³⁺, ligand exchange with -OH and -COOH groups, and a BET surface area enhancement from 4.15 to 122.17 m 2 g −1 . Kinetic and isotherm modelling followed pseudo-second-order (R²=0.99) and Langmuir monolayer adsorption, confirming a chemisorption mechanism. HPLC speciation demonstrated time-resolved As(III) to As(V) oxidation. Real water application tests confirmed 2.82 mg g −1 As(III) removal, and regeneration studies confirmed high stability over five cycles with minimal metal leaching. This study provides a scalable, multifunctional strategy for As(III) remediation and contributes to understanding ligand-mediated redox-adsorption mechanisms in hybrid sorbents. Graphical The graphical abstract presents a visual summary of the synthesis, mechanistic pathways, and real-world performance of MnFe-LDH/BC@H3BTC for efficient arsenic removal from contaminated water. In the Preparation phase, manganese-iron layered double hydroxide (MnFe-LDH) is integrated with biochar and functionalized using trimesic acid (H3BTC), forming a porous and reactive hybrid structure. This composite material is engineered to provide abundant active sites for interaction with arsenic species. The Oxidation and Removal section details the mechanistic transformations involved in arsenic remediation. Arsenite (As(III)) undergoes oxidation to arsenate (As(V)) facilitated by redox-active Mn species, while multiple removal pathways electrostatic attraction, ligand exchange, complexation, and hydrogen bonding-contribute to the stable immobilization of arsenic on the material surface. This segment depicts the transformation and sorption processes, emphasizing the synergy between functional groups and structural components. In the Performance section, experimental data show that MnFe-LDH/BC@H3BTC achieves rapid removal of As(III), with a sorption efficiency of 99.4% within just 2 h, outperforming the individual or partially modified components. The MnFe-LDH/BC@H3BTC composite demonstrates excellent potential as a practical and scalable solution for arsenic remediation in real water systems, offering a combination of rapid kinetics, high efficiency, and multifunctional removal mechani
研究领域:
环境科学
·
材料科学
·
水处理技术
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吸附化学
·
环境工程
✓ 已验证
产品关联
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2025
·
IF 5.6
Kaidi Gao,Qiao Hu,Yu Xia,Guangming Han,Jianfeng Yao
NASICON-type Na 3 V 2 (PO 4 ) 3 (NVP) has been identified as an ideal cathode for sodium-ion batteries (SIBs) because of its ultra-fast Na + diffusion and very stable structure. However, it still suffers from significant problems such as a low operating voltage plateau (3.4 V, vs. Na + /Na), inferior electronic conductivity and unsatisfactory energy density (370 Wh kg −1 ), thereby hampering the commercialization of NVP. Herein, a series of Al 3+ /Ga 3+ co-doping Na 3 V 2 (PO 4 ) 3 cathodes were successfully prepared through a facile solid-state reaction process. The substitution of Al 3+ /Ga 3+ for V 3+ in Na 3 V 2–2x Al x Ga x (PO 4 ) 3 ( x = 0, 0.1 and 0.2) effectively activates the electrons outside of V and achieves an extra redox couple V 4+ /V 5+ for high-voltage (3.9 V, vs. Na + /Na) reactions. Moreover, the presence of Ga in this series of electrode materials increases the proportion of sp 2 -type carbon. The optimized Na 3 V 1.8 Al 0.1 Ga 0.1 (PO 4 ) 3 material possesses high ionic/electronic conductivity and superior electrochemical performance: the energy density is enhanced by approximately 13.1 % at 0.1 C (from 345.4 Wh kg −1 for NVP to 390.7 Wh kg −1 for Na 3 V 1.8 Al 0.1 Ga 0.1 (PO 4 ) 3 ), and the power density is increased by approximately 135 % at 30 C (from 2574 W kg −1 for NVP to 6039 W kg −1 for Na 3 V 1.8 Al 0.1 Ga 0.1 (PO 4 ) 3 ). Furthermore, Na 3 V 1.8 Al 0.1 Ga 0.1 (PO 4 ) 3 exhibits excellent cycling stability with 93.4 % capacity retention after 350 cycles at 1 C. Ex-situ XPS and electrochemistry investigations imply the high reversibility of the V 3+ /V 4+ /V 5+ redox reaction in Na 3 V 1.8 Al 0.1 Ga 0.1 (PO 4 ) 3 . This work proposes a novel strategy to modulate the electronic structure of NVP by co-doping with Al 3+ and Ga 3+ to achieve reversible multi-redox activity (V 3+ /V 4+ /V 5+ ) in NASICON-type NVP, thus providing a viable approach for advancing ultrafast high-energy sodium storage.
研究领域:
材料科学
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电化学
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储能技术
·
固态化学
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产品关联
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2025
·
IF 5.6
Shanshun Wang,Xiaowei Kang,Siying Wu,Lei Dong,Wei-Shi Li,Fu-Gang Zhao
The extremely limited energy density and leakage risks of liquid electrolytes in supercapacitors have hindered their widespread industrialization. In this study, a novel cross-linked gel polymer electrolyte was designed and prepared by incorporating redox-active units to enhance energy density and address leakage issues in supercapacitors. These quasi-solid-state redox-active electrolytes (DCBQ@PVA) were synthesized through nucleophilic functionalization of a polyvinyl alcohol (PVA) matrix with dichlorobenzoquinone (DCBQ) redox crosslinkers. Electrolyte membranes were fabricated via solution casting, and their performance was systematically optimized. As expected, the DCBQ@PVA gel electrolyte significantly improved the electrochemical performance of quasi-solid-state supercapacitors, expanding the voltage window from 1.0 V to 1.8 V, increasing the specific capacitance from 27 F g⁻¹ to 43 F g⁻¹, and ultimately achieving a fivefold enhancement in energy density (up to 18.8 Wh kg⁻¹).
研究领域:
电化学
·
材料科学
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储能技术
·
高分子科学
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2025
·
IF 4.1
Jialei Bao,Yuxin Yang,Shilong Chang,Wenjing Xu,Yongmiao Shen,Fu-Gang Zhao
Enhancing the energy density of supercapacitors while maintaining their excellent cycling stability remains a major challenge in the field of energy storage. Herein, we report a novel non-covalently modified reduced graphene oxide (rGO) electrode using Indanthrene Black BBN (BBN), a commercially available industrial dye with a planar conjugated structure and high redox activity. Through strong π-π stacking interactions, BBN was uniformly anchored onto rGO sheets, forming a hybrid architecture that integrates electric double-layer capacitance and Faradaic pseudocapacitance. The resulting BBN-rGO-0.8 composite, obtained via a one-step hydrothermal process, exhibited superior electrochemical performance, including a high specific capacitance of 457 F g −1 at 1 A g −1 and remarkable rate capability with 91.6 % capacitance retention at 20 A g −1 in a three-electrode configuration. When assembled into a flexible symmetric aqueous supercapacitor using a PVA/H₂SO₄ gel electrolyte, the device achieved a high energy density of 19.8 Wh kg −1 at a power density of 800 W kg −1 , while maintaining 85.8 % capacitance retention over 10,000 charge-discharge cycles. This study not only demonstrats the potential of BBN as a cost-effective redox-active additive for graphene-based electrodes, but also provids a new strategy for designing high-performance energy storage devices through structure-function-cost integration.
研究领域:
储能
·
材料科学
·
电化学
·
纳米技术
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
Journal of Energy Storage
·
2023
·
IF 9.4
Qinzheng Hu,Shuzhen Cui,Kanjun Sun,Xiuting Shi,Wenxing Miao,Xiangbing Wang,Hui Peng,Guofu Ma
In recent years, the research focus of flexible supercapacitor is to improve its energy density . The recently reported improved energy storage method is to introducing suitable redox-additive in gel electrolytes to enhance their redox-activity. Herein, a novel stretchable, redox-active and double-network 4-hydroxy-2,2,6,6-tetramethylpiperidine 1-oxy-containing polyacrylamide/alginate/H 2 SO 4 (PAM/SA/H 2 SO 4 /TEMPOL) hydrogel electrolyte is prepared by radical cross-linking polymerization and solvent displacement process. The PAM/SA/H 2 SO 4 /TEMPOL hydrogel possesses superior stretchability (750 %) because of the electrostatic interactions between the -NH 3+ groups of the PAM and the -COO − groups of SA . In addition, the introduction of the TEMPOL additive into PAM/SA/H 2 SO 4 /TEMPOL hydrogel electrolyte of flexible EDLC can gain a high specific capacitance (386 F g −1 ) and high energy density of 24.5 Wh kg −1 , which is due to dual redox reactions both positive/negative electrode. This study provides a new strategy for designing a multifunctional redox hydrogel electrolyte.
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
Environments
·
2024
·Vol. 11
·期 7
·136
·
IF 3.5
Junhao Zheng,Mei Jiang,Qingzhu Li,Weichun Yang
Fe/Mn (hydr)oxides are metallic compounds that exhibit significant redox activity in environmental media and play a pivotal role in geochemical processes, thereby influencing the fate of metals in porous media. The morphology of Fe/Mn (hydr)oxides in natural environments and their interactions with trace metals are significantly influenced by the presence of natural organic matter (NOM). However, there is limited understanding regarding the formation, transport, and stability of Fe/Mn (hydr)oxides in the environment. The present study employed humic acid (HA) as a representative NOM material to investigate the positive influence of HA on the formation of Fe/Mn colloids. However, there remains limited comprehension regarding the formation, transport, and stability of Fe/Mn (hydr)oxides in the natural environment. In this study, we investigated the positive effect of natural organic matter (NOM) on the formation of Fe/Mn colloids using humic acid (HA) as a representative NOM material. We comprehensively characterized the chemical and physical properties of HA–Fe/Mn colloids formed under various environmentally relevant conditions and quantitatively analyzed their subsequent aggregation and stability behaviors. The findings suggest that the molar ratios of C to Fe/Mn (hydr)oxide play a pivotal role in influencing the properties of HA–Fe/Mn colloids. The formation and stability of HA–Fe/Mn colloids exhibit an upward trend with increasing initial molar ratios of C to Fe/Mn. Redox and metal–carboxylic acid complexation reactions between HA and hydrated iron/manganese oxides play a pivotal role in forming colloidal HA–Fe/Mn complexes. Subsequent investigations simulating porous media environments have demonstrated that the colloidal structure resulting from the interaction between HA and Fe/Mn facilitates their migration within surrounding porous media while also enhancing their retention in the surface layers of these media. This study offers novel insights into the formation and stabilization mechanisms of HA–Fe/Mn colloids, which are pivotal for comprehending the behavior of Fe/Mn colloids and the involvement of Fe/Mn (hydr)oxides in geochemical cycling processes within porous media.
研究领域:
环境科学
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地球化学
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胶体化学
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产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）