Science China-Materials
·
2023
·Vol. 66
·期 5
·1779-1792
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IF 8.1
Yang Jia,Wang Mengxiao,Chen Tao,Yu Xiang,Qin Gang,Fang Xiaohan,Su Xiaoxiang,Chen Qiang
Supercapacitors exhibiting toughness, self-healing, and high specific capacitance have practical significance for use in flexible and wearable electronic equipment. To meet these requirements, a novel multifunctional gel polymer electrolyte (GPE) consisting of polyvinyl alcohol (PVA)-sodium alginate (SA)-K 3 [Fe(CN)] 6 -Na 2 SO 4 was prepared. In this GPE, K 3 [Fe(CN)] 6 plays three crucial roles by serving as a carrier donor, ionic crosslinking agent and redox-active mediator. Consequently, the usual conflict between the conductivity and mechanical properties of GPEs is alleviated to some extent. In addition, the electrode specific capacitance and the energy density of the assembled supercapacitor are obviously improved because of the pseudocapacitance generated from the redox reaction of K 3 [Fe(CN)] 6 . Based on this GPE, the supercapacitor exhibits outstanding bending and stretching stabilities, significant self-healing, and anti-freezing properties. Therefore, the prepared GPE and supercapacitor are promising for application in flexible and wearable electronic equipment with complex service conditions.
研究领域:
材料科学
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能源技术
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF POWER SOURCES
·
2014
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IF 5.211
Guofu Ma,Jiajia Li,Kanjun Sun,Hui Peng,Jingjing Mu,Ziqiang Lei
A gel polymer PVA–KOH–K 3 [Fe(CN) 6 ] is prepared by potassium hydroxide and potassium ferricyanide doped polyvinyl alcohol, and a solid-state supercapacitor is assembled using the gel polymer as electrolyte and separator, activated carbons as electrode. The gel polymer exhibits flexible, high ionic conductivity and wide potential properties. The electrochemical properties of the supercapacitor are investigated using cyclic voltammetry , galvanostatic charge/discharge, and impedance spectroscopy techniques. The electrode specific capacitance of the supercapacitor can be as high as 430.95 F g −1 , and after 1000 cycles at a current density of 1 A g −1 it still remains higher than 380 F g −1 . The energy density and power density of the supercapacitor reach 57.94 Wh kg −1 and 59.84 kW kg −1 , respectively. These novel flexible gel polymers are desirable for applications in supercapacitor devices.
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 Energy Storage
·
2026
·
IF 10.7
Kaixin Xie,Xiaobo Chen
In the pursuit of advanced energy storage solutions, materials featuring high porosity, robust redox activity, and abundant electrochemically accessible sites are highly attractive candidates for next-generation supercapacitor electrodes. In this study, a binder-free positive electrode material consisting of porous MnCo 2 O 4 particles directly coated onto carbon cloth (MnCo 2 O 4 @CC) was synthesized via a straightforward hydrothermal process followed by thermal treatment. Additionally, the incorporation of redox additives into electrolytes has been identified as a promising approach to elevate electrochemical supercapacitor performance. To this end, we designed an aqueous asymmetric supercapacitor (ASC) system utilizing MnCo 2 O 4 @CC and activated carbon (AC) electrodes, where potassium ferricyanide (K 3 [Fe(CN) 6 ], denoted as KFCN) was introduced as an electrolyte additive to augment pseudocapacitive behavior. The electron migration mechanisms and charge storage dynamics of MnCo 2 O 4 @CC in a KOH + KFCN electrolyte were systematically investigated. The MnCo 2 O 4 @CC electrode immersed in a 3 M KOH + 0.05 M KFCN solution exhibited a high specific capacitance of 2206.7 F g −1 at 1 A g −1 , along with low resistance characteristics and exceptional cycling durability. A complete aqueous MnCo 2 O 4 @CC//KOH + KFCN//AC ASC was assembled, demonstrating enhanced specific capacitance, extended cycle life (94.5% capacitance retention after 10,000 cycles), and an ultrahigh energy density of 79.9 Wh kg −1 at 799.6 W kg −1 . These findings provide significant electrochemical insights and demonstrate the great potential of the MnCo 2 O 4 @CC-KOH + KFCN system for next-generation supercapacitor applications.
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DOI
高影响因子
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Sheng-Jin He,Jia-Pei Chen,Wei-Ming Guo,Xiu-Bing Chen,Huan Zhou,Chuang-Tian Zhan,Shi-Kuan Sun,Yun Li,Li-Xiang Wu,Jia-Xiang Xue,Hua-Tay Lin
In this study, CaO–Al 2 O 3 –MgO–SiO 2 glass was utilized to join SiC after surface polishing and etching, without the application of pressure. To join polished SiC at 1250 °C using CaO–Al 2 O 3 –MgO–SiO 2 glass proved unsuccessful. However, when polished SiC was joined at 1350 °C, the joint shear strength was 108.0 ± 15.5 MPa. Etching polished SiC with a NaOH–K 3 [Fe(CN) 6 ] solution effectively removed surface carbon, resulting in numerous micro-pits, that increased the joining area and improved the wettability of CaO–Al 2 O 3 –MgO–SiO 2 glass. The joint strengths of etched SiC joined at 1250 °C and 1350 °C were 29.0 ± 11.6 MPa and 125.1 ± 19.6 MPa, respectively. After ablation at 1200 °C for 10 min, the retained strength of the etched joints (joined at 1350 °C) was 61.9 ± 4.0 MPa, whereas the strength of the polished joints decreased to only 36.6 ± 10.7 MPa. Surface etching demonstrates the potential to significantly enhance the strength and high-temperature resistance of SiC joints.
研究领域:
材料科学
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陶瓷工程
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表面工程
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产品关联
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2025
·
IF 7.7
Xiaotong Wang,Tongtong Ye,Shaohui Geng,Shuna Ren,Xuming Zhao,Lihua Chen
A dual-signal strategy was developed based on a coordination reaction between iron(II) ions (Fe 2+ ) and potassium hexacyanoferrate(III) (K 3 [Fe(CN) 6 ]) to distinguish between brucella vaccine and wild strain. Utilizing metal-organic frameworks (MOFs), MOF Al (aluminum) @Fe 2+ @P 1 and MOF Fe @P 2 were synthesized and affixed to a hyaluronic acid (HA)-doped electrode. Hairpin probe 1 (P 1 ) has a common sequence (P 1 ') recognizing a fragment (T 1 ) in vaccines and wild strains. In contrast, hairpin probe 2 (P 2 ) has a differential sequence (P 2 ') only targeting a specific fragment (T 2 ) in the wild strain. Experimental findings indicated that activation of T 1 led to the dissociation of P 1 from MOF Al @Fe 2+ @P 1 , which released Fe 2+ into a buffer containing trace Fe 2+ . Following this, the addition of hydrogen peroxide (H 2 O 2 ) and K 3 [Fe(CN) 6 ] resulted in the formation of KFe[Fe(CN) 6 ] (PB). In contrast, specific activation of T 2 caused the detachment of P 2 from MOF Fe , thereby exposing its catalytic site. In H 2 O 2 , this catalytic site facilitated the conversion of trace Fe 2+ in buffer to Fe 3+ , with no PB generated after the addition of K 3 [Fe(CN) 6 ]. Simultaneous activation of T 1 and T 2 promoted the oxidation of Fe 2+ released from MOF Al by the exposed catalytic site of MOF Fe . The ratio of K 3 [Fe(CN) 6 ] to PB exhibited dynamic changes. Specifically, the ratio below 2.37 ± 0.05 indicated a Brucella-positive sample, whereas a ratio under 0.9 ± 0.02 suggested a sample derived from the vaccine. The scarcity of dual-signal sensors employing coordination reactions underscores the significance of this approach. Moreover, it addressed the challenges associated with brucella detection, demonstrating robust analytical performance.
研究领域:
生物化学
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医学检测
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分析化学
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产品关联
DOI
高影响因子
ENZYME AND MICROBIAL TECHNOLOGY
·
2022
·
IF 3.705
Hao Zhang,Zhao-Miao Gong,Yan Li,Feng-Qing Yang
A convenient and green method was developed using a personal glucose meter (PGM) for direct determination of hydrogen peroxide and hypochlorite in household disinfectants based on the acetylthiocholine iodide (ATCI)-mediated reaction. In this method, acetylcholinesterase catalyzes the hydrolysis of ATCI to generate thiocholine iodide, which can trigger the reduction of K 3 [Fe(CN) 6 ] to K 4 [Fe(CN) 6 ] and generate a PGM detectable signal. When the hydrogen peroxide or hypochlorite is pre-incubated with the ATCI, the yield of thiocholine will be decreased because the iodine molecules can initiate the oxidation of thiocholine to disulphides , leading to a lower PGM readout. Thus, the hydrogen peroxide or hypochlorite can be directly quantified by PGM as simple as detecting glucose in blood. After being systematically investigated, the optimum conditions of the PGM method are as follows: 5.0 min of enzymatic reaction time, 6.0 mM final concentration of ATCI solution, and 10.0 min of reaction time between ATCI/H 2 O 2 and thiocholine. Moreover, the recoveries of hydrogen peroxide in real sample spiked with three different concentrations (final concentrations of 5.0, 10.0, and 20.0 mM) are in the range of 96.3–108.4%. The recoveries of hypochlorite in real sample spiked with three different concentrations (final concentrations of 1.0, 5.0, and 10.0 mM) are in the range of 99.4–117.0%. These results indicate that the developed method can be employed for the detection of hydrogen peroxide and hypochlorite in household disinfectants.
研究领域:
分析化学
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环境科学
·
化学工程
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产品关联
DOI
PubMed
高影响因子
MICROCHEMICAL JOURNAL
·
2024
·
IF 4.9
Yao Yu,Xiaolei Liu,Ning Xu,Lin Li,Yaming Yang,Mingyuan Liu,Lianjing Zhao,Xue Bai
Immunoassays are the primary method used for detection of foodborne parasitic infection. The nanomaterials used in these assays often present challenges such as complex preparation requirements and low stability during long-term storage and transport. Herein, based on cost-effective K 3 [Fe(CN) 6 ]-mediated in-situ generated CuFe Prussian blue analogues (CuFe-PBA) and quinoxaline derivatives with high fluorescence, a dual-mode immunoassay was proposed for foodborne parasitic infection. This platform is relied on the restoration of K 3 [Fe(CN) 6 ] by ascorbic acid (AA). In addition to this process, K 4 [Fe(CN) 6 ]-triggered the generation of CuFe-PBA, and the enhanced fluorogenic reaction of dehydrogenated AA and o -phenylenediamine (OPD) occur sequentially. Without complex probes preparation, the assay enabled the rapid on-site detection of ALP and foodborne parasitic infection through a colorimetric mode accessible via smartphone and offered enhanced sensitivity through a fluorescent mode. The method was used for the detection of ALP, achieving detection limits of 0.38 U/L and 0.03 U/L for colorimetric and fluorescence modes, respectively. Subsequently, the dual-mode immunoassay was applied to Trichinella spiralis infection. The sensitivity and specificity of both the colorimetric and fluorescence modes were 100 % in 950 pig serum samples. This immunosensor provides a universal analysis tool for the accurate, cost-effective and highly sensitive detection of foodborne parasitic infection.
研究领域:
分析化学
·
食品安全
·
生物技术
·
寄生虫学
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产品关联
DOI
高影响因子
TALANTA
·
2024
·
IF 5.6
Zong-Xian Zhu,Xuan Zhang
In this work, a novel ratiometric electrochemical sensor for bisphenol A (BPA) detection was facilely constructed by coupling conductive carbon black (VXC-72R) with ferricyanide probe. The VXC-72R was decorated with nonionic surfactant Tween to enhance the sensitivity and coated on glassy carbon electrode (GCE), whereas K 3 [Fe(CN) 6 ] was introduced into electrolyte solution as an internal reference probe to realize dual-signal outputs. The present ratiometric electrochemical sensor achieved a highly sensitive and selective detection of BPA in PBS solution (pH = 7.0), with a linear range of 0.08–40.0 μM and detection limit of 0.05 μM. Moreover, it has been successfully applied to the determination of BPA in real lake water and milk samples with the satisfactory recoveries rates of 94.8–102.3 %.
研究领域:
分析化学
·
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
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