JOURNAL OF THE ELECTROCHEMICAL SOCIETY
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2017
·Vol. 164
·期 13
·G112
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IF 3.259
Yuchen Hui,Xiaoyan Ma,Fengjin Qu,Fang Chen,Ying Chen
A practical strategy is developed to fabricate stable glucose/O2 biofuel cells with high power density assembled by enzymatic bio-electrodes based on three-dimensional nickel foam. The porous three-dimensional nickel foam is used as a substrate to enhance the enzyme loading, while the reduced graphene oxide and gold nanoparticles decorating on the nickel foam are employed as the direct electron transfer system for bio-anodes and bio-cathodes. The ferrocenecarboxylic acid serves for the mediated electron transfer to further increase electron transfer rate for glucose oxidase electrodes. Covalent bond is employed to immobilize the mediator and enzymes for improving the stability of bio-electrodes and biofuel cells. As the results, the surface glucose oxidase loading reaches to 4.03 × 10−7 mol cm−2 with good enzymatic activity. Additionally, the obtained glucose/O2 biofuel cells exhibit an outstanding maximum power density of 2.84 ± 0.09 mW cm−2, with a remarkable long-term operational stability for retaining 85.5% of its performance after 70 days. In human blood, the biofuel cell shows a favorable output performance of 0.39 ± 0.04 mW cm−2, implying the appropriateness for practical applications.
研究领域:
生物化学
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材料科学
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能源技术
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SEPARATION AND PURIFICATION TECHNOLOGY
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2017
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IF 3.359
Cheng Tan,Lei Li,Kongzhai Li,Dapeng Zhong
A novel method to separate As from high As-Sb dust using Fe 2 O 3 as a fixative under an O 2 -N 2 atmosphere is proposed. Here, Sb is oxidised and converted to Sb 2 O 4 and FeSbO 4 that remain in the roasted residue, and As is volatilized in the form of As 4 O 6 . The Sb 2 O 3 can be selectively oxidised from the dust by using 21 vol% O 2 , but the formation of amorphous substance (As-Sb-O) hinders the effective separation of As and Sb. Adding Fe 2 O 3 hinders the amorphous substance formation and destroys the structure of the solid solution ((Sb, As) 2 O 3 ) in the raw material by converting the Sb component in it to FeSbO 4 . Therefore, the volatilization rates of As and Sb can reach up to 90.53% and only 13.20%, respectively at a roasting temperature of 723 K, roasting time of 90 min, an Fe 2 O 3 dosage of 15 mass%, and O 2 content of 21 vol%.
研究领域:
冶金学
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环境科学
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Journal of Materials Chemistry A
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2019
·Vol. 8
·期 1
·259-267
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IF 10.733
Congcong Dang,Yu Wang,Biao He,Weibin Zhang,Feng Dang,Hongchao Wang,Yong Du
Searching for highly efficient and low cost electrocatalysts is an urgent challenge to provide high capacity and long cycle life Li–O2 batteries (LOBs). In this work, the highly efficient electrocatalytic properties of MoSi2 were first demonstrated using particles prepared by a solid–state reaction method. The surface was activated, playing a dominant role in the electrocatalytic performance. After acid etching to remove SiO2 impurities arising from the surface oxidation, MoSi2 exhibited excellent bifunctional electrocatalytic properties for LOBs. Mo6+ on the surface contributed to the initial low overpotentials of 0.45 V (3.2 V for the OER and 2.75 V for the ORR) and transformed into Mo4+ for a long cycle life. As a consequence, outstanding rate capabilities of 12 708 mA h g−1 at 100 mA g−1 and 10 794 mA h g−1 at 800 mA g−1, and excellent cycle durability of 215 and 90 cycles at a limited capacity of 1000 mA h g−1 at 200 and 500 mA g−1, respectively, were obtained for the MoSi2 cathode.
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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高影响因子
CERAMICS INTERNATIONAL
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2023
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IF 5.2
Siyuan Li,Cuiwei Li,Huaiming Jia,Guangjin Chen,Kepi Chen,Linan An
In this paper, a series of (Ce 0.2 Zr 0.2 Ti 0.2 Sn 0.2 Y 0.2- x Ca x )O 2-δ ( x = 0∼0.2) high-entropy of compositionally-complex ceramics were prepared using solid-state reaction method. The results showed that the content of Ca 2+ had significant effects on the phase composition, microstructure and properties of the prepared materials. As Ca 2+ content increased, single-phase fluorite was easier to form. When x ≤ 0.05, materials contained dual-phase of fluorite and pyrochlore structures. When x ≥ 0.075, the prepared materials showed single-phase fluorite structure, which indicated that high-entropy fluorite ceramics (HEFCs) could be prepared under this condition. When Ca 2+ content increased from 0.075 to 0.2, grain size of HEFCs decreased, and relative density decreased from 95.7 % to 78.6 %. Thermal conductivity of these HEFCs varied from 1.87 W m −1 K −1 to 1.60 W m −1 K −1 , which was lower than 8YSZ. As Ca 2+ content increased, both size disorder and mass disorder increased too leading to low thermal conductivity. The results indicate that the prepared HEFCs are promising for thermal insulation applications.
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Frontiers in Bioengineering and Biotechnology
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2023
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IF 5.7
Yujia Liang,Zhengmin Cai,Yamei Tang,Chenglin Su,Liye Xie,Yan Li,Xinqiang Liang
Introduction: Reactive oxygen species (ROS)-mediated therapies have typically been considered as noninvasive tumor treatments owing to their high selectivity and efficiency. However, the harsh tumor microenvironment severely impairs their efficiency. Methods: Herein, the biodegradable Cu-doped zeolitic imidazolate framework-8 (ZIF-8) was synthesized for loading photosensitizer Chlorin e6 (Ce6) and CaO 2 nanoparticles, followed by surface decoration by hyaluronic acid (HA), obtaining HA/CaO 2 -Ce6@Cu-ZIF nano platform. Results and Discussion: Once HA/CaO 2 -Ce6@Cu-ZIF targets tumor sites, the degradation of Ce6 and CaO 2 release from the HA/CaO 2 -Ce6@Cu-ZIF in response to the acid environment, while the Cu 2+ active sites on Cu-ZIF are exposed. The released CaO 2 decompose to generate hydrogen peroxide (H 2 O 2 ) and oxygen (O 2 ), which alleviate the insufficiency of intracellular H 2 O 2 and hypoxia in tumor microenvironment (TME), effectively enhancing the production of hydroxyl radical (•OH) and singlet oxygen ( 1 O 2 ) in Cu 2+ -mediated chemodynamic therapy (CDT) and Ce6-induced photodynamic therapy (PDT), respectively. Importantly, Ca 2+ originating from CaO 2 could further enhance oxidative stress and result in mitochondrial dysfunction induced by Ca 2+ overloading. Conclusion: Thus, the H 2 O 2 /O 2 self-supplying and Ca 2+ overloading ZIF-based nanoplatform for cascade-amplified CDT/PDT synergistic strategy is promising for highly efficient anticancer therapy.
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PubMed
高影响因子
FUEL
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2023
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IF 7.4
Qi Rong,Wenkai Huang,Fuhua Xu,Yanlan Wang,Changlong Wang,Xiang Liu
In spite of significant developments are accomplished in the exploration of H 2 and O 2 evolution upon water electrolysis/photolysis, this remains a challenge to design and develop ideal catalytic systems for this reaction and to isolate H 2 from H 2 -O 2 mixture with membranes. Herein, a series of ZIF-67-supported transition metal nanoparticles (TMNPs/ZIF-67), including Pt, Ir, Pd, Rh, Au and Ag, via immobilization of ultrafine TMNPs at the surface of ZIF-67, have been designed and developed for the selective H 2 generation from NH 3 BH 3 hydrolysis and O 2 evolution upon H 2 O 2 decomposition. In particular, the optimized nanocatalyst Pt/ZIF-67 presents the super-high catalytic property in the both H 2 evolution upon NH 3 BH 3 hydrolysis (689 mol(H 2 )·mol Pt -1 ·min −1 ) and O 2 evolution upon H 2 O 2 decomposition (979 mol(O 2 )·mol Pt -1 ·min −1) at 30 °C. Importantly, the selective “on–off” control for demand-based H 2 generation from NH 3 BH 3 hydrolysis was successfully realized by Zn 2+ /EDTA-2Na system. This highly efficient Pt/ZIF-67 proposed a new method for the promising potential application of ammonia borane and hydrogen peroxide as an economic and safe H 2 resp. O 2 carrier for fuel cell.
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COLLOIDS AND SURFACES B-BIOINTERFACES
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2023
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IF 5.8
Shuo Liu,Huiqi Yang,Liguo Zhang,Alberto Bianco,Baojin Ma,Shaohua Ge
The injured bone microenvironment is typically characterized by high-level reactive oxygen species (ROS, mainly H 2 O 2 ) and low content of oxygen. The former can cause cell apoptosis, induce immune imbalance and inflammation, inhibit osteogenic differentiation, and delay bone repair . In this work, barrier membranes made of a combination of hydroxyapatite nanowires (HAp NWs) and polylactic acid (PLA) loaded with manganese dioxide nanosheets (NSs) ( [email protected] ) were prepared to guide bone regeneration (GBR). Due to the catalytic function of MnO 2 , [email protected] membranes are able to effectively decompose H 2 O 2 to generate O 2 . In vitro experiments demonstrated [email protected] membranes inhibited the apoptotic process caused by high level of H 2 O 2 , decreased intracellular oxidative stress , suppressed inflammation-related gene/protein expression, and inhibited macrophage M1 polarization. The nanostructured HAp stimulated osteogenic differentiation, and the loading of MnO 2 NSs played a synergistic effect. In addition, the barrier function of PLA could hamper the epithelium overgrowth, providing the development space for periodontal regeneration. By scavenging H 2 O 2 , generating O 2 , eliminating inflammation, and regulating immune response, [email protected] membranes efficiently promoted bone regeneration. Our results confirmed that composite membranes have great potential for application in GBR, and provide a reference for future design of bone repair materials.
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SEPARATION AND PURIFICATION TECHNOLOGY
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2022
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IF 9.136
Wei Zhou,Liang Xie,Yan Wang,Yani Ding,Xiaoxiao Meng,Fei Sun,Jihui Gao,Guangbo Zhao
Large-scale application of H 2 O 2 production through 2-electron oxygen reduction reaction (2eORR) greatly depends on the cost of electrode materials and configuration. In this work, engineered coal-derived oxygen-rich hierarchical activated coke (AC), which is low-cost and highly tunable in porosity and surface chemistry, was used as catalyst to fabricate gas diffusion electrodes (GDEs) for efficient H 2 O 2 production. Results showed that Fenton’s reagents treatment could significantly increase the contents of C O and –COOH on AC, leading to an increased hydrophilicity. However, the higher O contents do not necessarily enhance the selectivity of AC towards 2eORR (i.e., F-5-AC, F-10-AC), especially that F-20-AC exhibited a complete 4e pathway. GDEs were then fabricated with AC and oxidized AC as catalyst, key fabrication parameters including the PTFE binder and AC particle size, and operating parameters such as current intensity, electrolyte pH, and O 2 flow rate were optimized. Up to 747 mg/L H 2 O 2 were generated within 90 min. Results showed that oxidized AC exhibited a decreased H 2 O 2 yield, due to the flooding of GDEs caused by super-hydrophilicity property. Finally, DFT calculations were employed to reveal the synergistic effect of different O groups considering the fact of high O contents on AC.
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CHEMICAL ENGINEERING JOURNAL
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2023
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IF 15.1
Daming Yang,Guiru Sun,Xinru Wang,Fengyang Li,Ze Gao,Pingli Zhang,Wei Lu,Ming Feng
The photo-assisted lithium-oxygen (Li-O 2 ) cell is widely concerned due to its low overpotential. However, rapid recombination rate of photogenerated electrons and holes remains a fundamental challenge for photo-assisted Li-O 2 cells. Herein, we design an optical and magnetic fields co-assisted Li-O 2 cell based on α-Fe 2 O 3 nanospindles. We employed PL spectrum and I-t curve confirm that under the magnetic field, the photogenerated electrons and holes are driven via the opposite Lorentz forces in photo-assisted Li-O 2 cells, which is beneficial to accelerating the formation and decomposition of Li 2 O 2 . The optical and magnetic fields co-assisted Li-O 2 cell based on α-Fe 2 O 3 nanospindles achieves an ultra-high discharge platform of 3.47 V and a low charge platform of 3.57 V, as well as a surprising energy efficiency of 97.2%. In addition, the optical and magnetic fields co-assisted Li-O 2 cell can stably cycle for over 25 cycles. This study offers a reference for improving the electrochemical kinetics of photo-assisted Li-O 2 cell by introducing magnetic field, which opens up a new avenue for the development of high-performance Li-O 2 cells.
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JOURNAL OF ELECTROANALYTICAL CHEMISTRY
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2023
·
IF 4.5
Chaoyang Sun,Fenglong Xiao,Di Wu,Gang Lian,Deliang Cui,Qilong Wang,Haohai Yu
Rechargeable Li-O 2 batteries show great potential due to their superior high energy density. However, the practical application is still limited by the sluggish kinetics, resulting in poor cycling performance and high overpotentials. Herein, highly dispersed Co nanoparticles embedded into porous N -doped carbon matrix (DCo-NC) with carbon nanotubes is explored through the pyrolysis of a bimetallic leaf-shaped ZnCo-ZIFs. The evaporation of Zn species and porous carbon matrix derived from ZIFs prevents the Co nanoparticles aggregation, exposes more Co-N active sites and provides abundant pores. They facilitate Li + and electron transfer, prevent Co nanoparticles from deactivation and provide enough space for Li 2 O 2 , thereby accelerating oxygen reduction reaction (ORR)/oxygen evolution reaction (OER) kinetics. Accordingly, the Li-O 2 batteries with DCo-NC cathode exhibit reduced overpotential, high discharge capacity (10,490 mA h g −1 at 100 mA g −1 current density) and improved cycling performance (258 cycles at 500 mA g −1 with a limited capacity of 500 mA h g −1 , 103 cycles at 500 mA g −1 with a limited capacity of 1000 mA h g −1 ).
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Small
·
2022
·Vol. 18
·期 23
·2200548
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IF 15.153
Meng-Meng Pan,Yu Ouyang,Yong-Li Song,Lu-Qin Si,Ming Jiang,Xu Yu,Li Xu,Itamar Willner
The synthesis and characterization of Au 3+ -modified UiO-67 metal-organic framework nanoparticles, Au 3+ -NMOFs, are described. The Au 3+ -NMOFs reveal dual oxidase-like and peroxidase-like activities and act as an active catalyst for the catalyzed generation of O 2 •− under aerobic conditions or •OH in the presence of H 2 O 2 . The two reactive oxygen species (ROS) agents O 2 •− and •OH are cooperatively formed by Au 3+ -NMOFs under aerobic conditions, and in the presence of H 2 O 2. The Au 3+ -NMOFs are applied as an effective catalyst for the generation ROS agents for antibacterial and wound healing applications. Effective antibacterial cell death and inhibition of cell proliferation of Staphylococcus aureus ( S. aureus ) and Escherichia coli ( E . coli ) bacterial colonies are demonstrated in the presence of the Au 3+ -NMOFs. In addition, in vivo experiments demonstrate effective wound healing of mice wounds infected by S. aureus , treated by the Au 3+ -NMOFs.
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高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2022
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IF 9.965
Qian Wang,Weiwang Qiu,Mengna Li,Na Li,Xiaoran Li,Xiaohong Qin,Xueli Wang,Jianyong Yu,Faxue Li,Liqian Huang,Dequn Wu
Diabetic wound treatment remains a major challenge due to the difficulties of eliminating bacterial biofilm and relieving wound hypoxia . To address these issues simultaneously, a multifunctional Dex-SA-AEMA/MnO 2 /PDA (DSAMP) hydrogel platform was developed with excellent biocompatibility and porous structure. The hydrogel could absorb the exudate, maintain humidity and permeate oxygen, which was prepared by encapsulating polydopamine (PDA) and manganese dioxide (MnO 2 ) into Dex-SA-AEMA (DSA) hydrogel by UV irradiation . With the addition of PDA , the DSAMP hydrogel was proved to eliminate the biofilm after NIR photodynamic therapy (PTT, 808 nm) irradiation at 54 °C. Furthermore, in order to mitigate hypoxia wound microenvironment, MnO 2 nanoparticles were added to convert the endogenous hydrogen peroxide (H 2 O 2 ) into oxygen (O 2 , 16 mg L −1 ). The diabetic wound in vivo treated by DSAMP hydrogel was completely healed on 14 days. It was revealed that the DSAMP hydrogel possessed a great potential as dressing for diabetic chronic wound healing.
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