INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2023
·
IF 7.2
Minghua He,Zulhumar Turup,Xuekun Jin,Fengjuan Chen
MnO 2 is considered to be one of the most promising electrocatalysts for oxygen reduction reactions (ORR) in alkaline media and can be applied to various electrochemical energy conversion and storage devices. However, it is limited by the relatively slow kinetics of the cathodic electrochemical reactions . In addition, it is difficult to control the presence state of Ag during the modification of MnO 2 . To this end, an efficient ORR electrocatalyst of Ag nanoparticles supported by MnO 2 nanorods was successfully synthesized by using NH 3 ·H 2 O as a complexing agent to inhibit the Ag + intercalating into the tunnels of MnO 2 . The half-wave potential ( E 1/2 ) and limiting current density ( J lim ) of the obtained Ag/MnO 2 electrocatalysts are 0.81 V and −5.6 mA cm −2 , respectively, showing comparable ORR catalytic activity to commercial Pt/C catalysts. The excellent catalytic performances can be attributed to the presence of abundant oxygen vacancies and Mn 3+ species on the MnO 2 surface, as well as the synergistic effect between MnO 2 substrates and Ag nanoparticles. Among them, oxygen vacancies enhances the adsorption of O 2 , Mn 3+ facilitates the displacement of O 2 2− /OH − , MnO 2 inhibits the accumulation of peroxide species to improving the oxygen environment on the Ag surface and Ag accelerates the electron transfer in the whole process. This work provides a useful guide for the design of efficient Mn-based ORR electrocatalysts.
研究领域:
材料科学
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电化学
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DOI
高影响因子
CHEMISTRY-A EUROPEAN JOURNAL
·
2021
·Vol. 27
·期 36
·9398-9405
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IF 5.236
Xueling Tan,Ruonan Wang,Xiaofei Liu,Wei Wang,Lixin Cao,Bohua Dong
Graphical A large amount of Fe 2+ was induced into Mn 3 O 4 nanoparticles through effective electrodisplacement reaction to synthesize Mn 3− x Fe X O 4 hollow nanostructures. By changing the addition of Fe 2+ , elemental compositions and structures of Mn 3− x Fe x O 4 could be well adjusted. The remarkable performance of Mn 3− x Fe x O 4 hollow nanostructures in pseudocapacitor applications is demonstrated. Compared with the original Mn 3 O 4 , the electrochemical performance of the obtained porous Mn 3− x Fe x O 4 nanostructure is significantly improved. Design of hollow nanostructure and controllable phase of mixed metal oxides for improving performance in supercapacitor applications is highly desirable. Here we demonstrate the rational design and synthesis of Mn 3−x Fe x O 4 hollow nanostructures for supercapacitor applications. Owing to high porosity and the specific surface area that provides more active sites for electrochemical reactions, the electrochemical performance of Mn 3−x Fe x O 4 hollow nanostructure substantially enhanced comparing with pristine Mn 3 O 4 . Particularly, in 1.0 M KOH electrolyte, Mn 0.16 Fe 2.84 O 4 with a typical diameter of 20 nm exhibits excellent specific capacitance of 2675, 2320, 1662, 987 F g −1 at current densities of 1, 2, 5, 10 A g −1 , respectively, which is significantly superior to those of other transition metal oxides. Besides, an asymmetric supercapacitor is assembled by using Mn 0.16 Fe 2.84 O 4 and activated carbon as a positive and a negative electrode, respectively. Electrochemical results indicate a high energy density of 42 Wh kg −1 at a power density of 0.75 kW kg −1 , which makes this hollow nanostructure a highly promising electrode for achieving high-performance next-generation supercapacitors.
研究领域:
材料科学
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能源存储与转换
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纳米技术
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DOI
PubMed
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2021
·
IF 7.46
Xiaofeng Tan,Ximei Sun,Yan Li,Yuting Zeng,Jinding Gong,Ziyu Wang,Yuhao An,He Li
Bio-inspired enzyme–inorganic hybrid nanomaterials are extensively employed for biological applications owing to their capability of enhancing enzyme activity and stability compared with free counterpart. They play a vital role in signal output and amplification during bioassay, but usually suffer from deactivation and costing problems, which motivates us to seek a more robust signal generation pattern. The coordination interaction between metal ions and amide groups in enzyme drives the evolution of various morphology and structure. Inspired by this, C-reactive protein (CRP) aptamer, with amide groups in their nucleobases, is introduced as an organic part serving as a linker and biorecognition unit to prepare aptamer-inorganic hybrid nanosheets, and be applied for CRP detection. Unlike using organic enzymes as a signal enhancer, the inorganic part, Mn 3 (PO 4 ) 2 , is exploited for generating and transducing firm current signals, which stem from electrochemical active molybdophosphate precipitates reacted by phosphate and external molybdate. This enzyme-free electrochemical aptasensor based on biomineralized Mn 3 (PO 4 ) 2 /aptamer exhibits an excellent detection performance for CRP. And the reliability is also acceptable compared to the traditional immunoturbidimetric method at the hospital, suggesting our method good feasibility for clinical diagnosis.
研究领域:
生物传感器
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纳米技术
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电化学
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生物医学工程
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产品关联
DOI
高影响因子
JOURNAL OF POWER SOURCES
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2023
·
IF 9.2
Pei Gao,Boxiong Shen,Peng Zhao,Guofei Shi,Xiaolan Zhao
Recycling metal resources from spent battery powder to prepare electrode materials is an eco-friendly and sustainable strategy. However, direct utilization of spent battery powder is mostly ignored, and the prepared electrode materials by this approach exhibit limited electrochemical performance. Herein, we employ unpurified spent zinc-carbon battery powder (SP) and carbon nanotubes (CNTs) as raw materials to fabricate SP/CNTs via the ball milling method, and then use a novel electrochemical activation strategy to obtain oxygen vacancy-rich SP@CNTs (Ov-SP@CNTs) materials. Under the combined action of CNTs doping and oxygen vacancies caused by the tuning of Mn 2+ /Mn 3+ ratio via the electrochemical activation strategy, the optimum electrode (Ov-SP@CNTs-10) for supercapacitor shows the specific capacitance of 443.9 F g −1 at 1 A g −1 , which is nearly six and three times higher than that of SP and SP/CNTs electrodes, respectively. Additionally, the packaged asymmetric supercapacitor (ASC) device with Ov-SP@CNTs-10 as the cathode and commercial active carbon (AC) as the anode manifests a large energy density of 25.51 Wh·kg −1 at the power density of 399.98 W kg −1 , and the capacity retention of 88.58% after 10,000 cycles at 4 A g −1 . This work opens up a new way for the direct utilization of SP to prepare high-performance supercapacitor electrode materials.
研究领域:
材料科学
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能源技术
✓ 已验证
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2017
·
IF 4.798
Fengxia Zhang,Ping Zhang,Qiong Wu,Wenjing Xiong,Qi Kang,Dazhong Shen
Herein, we proposed a simple method to measure the inner resistance of a photoelectrochemical (PEC) sensor. Three photoanodes, including TiO 2 nanotubes array (TiO 2 NTs), g-C 3 N 4 /TiO 2 NTs and Mn 3 (BTC) 2 /g-C 3 N 4 /TiO 2 NTs (BTC = 1,3,5-benzene- tricarboxylic acid), were chosen as the models. It was shown the change in inner resistance of the photoanode is the main factor for the photocurrent response in a PEC sensor. Under light excitation, the inner resistance of the photoanode is reduced remarkably, resulting in the increment in the photocurrent. The influence of the light intensity on the inner resistance is less than that on the photocurrent, due to the synchronous change in photovoltage . With increasing concentration of hole scavengers (e.g., H 2 O 2 , ascorbic acid), the steady inner resistances of the three photoanodes are decreased. In the PEC sensor with Mn 3 (BTC) 2 /g-C 3 N 4 /TiO 2 NTs, the Mn 3 (BTC) 2 layer is served as a size-exclusion filter to prevent the diffusion of molecules with size larger than the apertures in crystals, which improves the selectivity of the PEC sensor to smaller molecules (e.g., H 2 O 2 ). The catalytic effect of Mn 3 (BTC) 2 to H 2 O 2 enhances the PEC response sensitivity to H 2 O 2 . Under optimized conditions, the reciprocal of the averaged steady effective inner resistance of Mn 3 (BTC) 2 /g-C 3 N 4 /TiO 2 NTs is in a linear correlation with the logarithmic concentration of H 2 O 2 in the range of 0.003 to 10 μM with a limit of detection of 1 nM. This PEC sensor was applied for H 2 O 2 determination in exhaled breath condensate samples.
研究领域:
分析化学
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材料科学
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生物医学工程
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产品关联
DOI
高影响因子
RSC Advances
·
2016
·Vol. 6
·期 97
·95199-95203
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IF 3.289
Shi-Yu Lu,Sheng-Hui Liao,Shu-Juan Bao,Meng Jin,Bo Weng,Chang-Ming Li
The excellent selectivity and anti-interference ability of enzyme-based biosensors have attracted considerable attention by researchers. However, the short lifetime, difficult electron transfer, and easily leak from the supporting materials restrict the practical applications of enzyme. In this study, an enzyme–inorganic hybrid biosensor constructed from slack Hb–Mn3(PO4)2·3H2O nanosheets was prepared by a simple and effective in situ immobilization method. Designed as an H2O2 sensor, it exhibits a fast electron transfer rate constant (ks = 4.16 s−1), an ultra-wide linear range for H2O2 detection (20 to 56 100 μM), and long life-time (85% of initial response after 29 days), which may be attributed to the effective immobilization of the enzyme and the good biocompatibility of Mn3(PO4)2·3H2O. For the detection of a real sample, the range of recovery of our designed biosensor was around 98.2–102.6%, confirming that our proposed method presents a promising immobilization enzyme-based biosensor for use in practical applications.
研究领域:
生物化学
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分析化学
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材料科学
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DOI
高影响因子
TALANTA
·
2017
·
IF 4.162
Qi Wang,Qian Zhou,Qicheng Zhang,Rongjia Shi,Shangshang Ma,Wenbo Zhao,Min Zhou
Preparation of high performance electrochemical biosensing interface for the sensitive and rapid detection of human metabolites is of great interest for health care and biomedical science. In this paper, based on the adhesion technique of marine mussels, we designed and prepared a novel biosensor with a micro/nano-biointerface of Fe 3 O 4 -Mn 3 (PO 3 ) 2 @Ni foam, which offered a three dimensional (3D) living environment for real cell. The constructed biosensor with a 3D micro/nano-biointerface of Fe 3 O 4 -Mn 3 (PO 3 ) 2 @Ni foam was characterized by scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS) and elemental mapping. Furthermore, the electrochemical experiments by electrochemical method for detection of superoxide anion (O 2 •− ) in situ released by cells were carried out by this biosensor we proposed. Results indicated that the 3D interface of mussel-inspired Fe 3 O 4 -Mn 3 (PO 3 ) 2 @Ni foam offered an amicable platform for promoting cell adhesion, which was beneficial for enhancing biosensing activity. This proposed sensing platform provided high electroactivity and excellent electron transport with a lower detection limit (0.0170 μM), wider linear range 0.04–2.44 μM) and short diffusion distance to reaction sites. The case achieved the accurate detection of O 2 •− (in situ released by cells) based on the combination of mussel-inspired biomimetic adhesion technique, 3D micro/nano-biointerface construction and electrochemical biosensing technique.
研究领域:
生物医学工程
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分析化学
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材料科学
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产品关联
DOI
PubMed
高影响因子
ACS Sustainable Chemistry & Engineering
·
2025
·
IF 7.3
Jun Zhang,Lanyu Luo,Jiankun Wang,Xinlan Xu,Tiantian Peng,Boyu Liu,Lingying Jiang,Meng Jin,Weimin Wu,Laizheng Luo,Huan Yi,Shi-Yu Lu
Optimizing the electronic configuration presents a promising approach to enhance intrinsic activity and minimize noble metal use in direct methanol fuel cells (DMFCs). Metal–support interactions, commonly employed to induce interfacial charge redistribution, play a crucial role in this optimization. This study successfully synthesized a Pd/O-OMS-2 electrocatalyst characterized by Pd–O–Mn interfacial chemical bonds and Mn3+/Mn4+ redox couples, serving as a stable bifunctional catalyst for both the oxygen reduction reaction (ORR) and methanol oxidation reaction (MOR). Unlike the mixed Pd–O/Mn bonds in Pd/O/Mn-OMS-2, the Pd–O–Mn bonds in Pd/O-OMS-2 not only enhance metal–support interactions and promote uniform dispersion of Pd nanoparticles but also facilitate electron transfer and the conversion between Mn3+ and Mn4+. These structural and compositional advantages endow the Pd/O-OMS-2 catalyst with superior ORR and MOR performance. The catalyst achieves a higher half-wave potential (E1/2) of 0.901 V, a mass activity of 0.937 A mgPd–1, and enhanced methanol permeability, outperforming Pd/O/Mn-OMS-2, Pd/OMS-2 and commercial Pd/C catalysts. Moreover, in an alkaline electrolyte, the Pd/O-OMS-2 catalyst follows a typical four-electron reaction pathway for ORR (O2 to H2O) and promotes faster reaction kinetics and charge transfer rates. In terms of durability, the Pd/O-OMS-2 catalyst exhibits minimal E1/2 decay (8 mV) and retains its structural integrity even after 10,000 cyclic voltammetry (CV) cycles. Additionally, it demonstrates the highest mass activity and stability during the MOR process. The exceptional ORR/MOR performance can be attributed to the synergistic effect of strong metal–support interactions, high Pd nanoparticle dispersion, and increased Mn3+ active species. The construction of interfacial chemical bonds offers a prospective strategy to optimize electronic configurations and develop advanced bifunctional electrocatalysts for ORR and MOR.
研究领域:
电化学
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催化材料
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能源材料
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产品关联
DOI
高影响因子
Nano Research
·
2020
·Vol. 14
·期 3
·879-886
·
IF 8.183
Zhao Shen Fei,Hu Fang Xin,Shi Zhuan Zhuan,Fu Jing Jing,Chen Yue,Dai Fang Yin,Guo Chun Xian,Li Chang Ming
It is critical for fabricating flexible biosensors with both high sensitivity and good selectivity to realize real-time monitoring superoxide anion (O 2 •− ), a specific reactive oxygen species that plays critical roles in various biological processes. This work delicately designs a Mn 3 (PO 4 ) 2 /MXene heterostructured biomimetic enzyme by assembling two-dimensional (2-D) Mn 3 (PO 4 ) 2 nanosheets with biomimetic activity and 2-D MXene nanosheets with high conductivity and abundant functional groups. The 2-D nature of the two components with strong interfacial interaction synergistically enables the heterostructure an excellent flexibility with retained 100% of the response when to reach a bending angle up to 180°, and 96% of the response after 100 bending/relaxing cycles. It is found that the surface charge state of the heterostructure promotes the adsorption of O 2 •− , while the high-energy active site improves electrochemical oxidation of O 2 •− . The Mn 3 (PO 4 ) 2 /MXene as a sensing platform towards O 2 •− achieves a high sensitivity of 64.93 µA·µM −1 ·cm −2 , a wide detection range of 5.75 nM to 25.93 µM, and a low detection limit of 1.63 nM. Finally, the flexible heterostructured sensing platform realizes real-time monitoring of O 2 •− in live cell assays, offering a promising flexible biosensor towards exploring various biological processes.
研究领域:
生物传感器
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材料科学
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电化学
·
生物医学工程
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产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2026
·
IF 4.4
Liu Jian,Li Jian,Wu Tong,Shen Renpeng,Zhou Haibo,Xiong Lizhi,Zhao Heping,Xiang Yanhong
Enhancing the lithium-ion diffusion and electronic conductivity of olivine-type LiMn 0.8 Fe 0.2 PO 4 cathode materials via solid-state synthesis is crucial for industrial application. In this study, a combination of high-energy grinding and solid-state synthesis was employed to systematically investigate the influence mechanisms of conventional grinding, single-stage high-energy grinding, and two-stage high-energy grinding regarding the electrochemical properties of LiMn 0.8 Fe 0.2 PO 4 . Electrochemical characterization revealed that the Mn 2+ /Mn 3+ redox pair contributed 72.99%, 77.31%, and 77.89% to the charge specific capacity under conventional grinding, single-stage high-energy grinding, and two-stage high-energy grinding, respectively. Correspondingly, the contribution rates to the discharge specific capacity were 55.44%, 75.48%, and 74.29%, with the corresponding specific capacity values being 39.37 mAh/g, 84.85 mAh/g, and 107.57 mAh/g, respectively. These results demonstrate that the high-energy grinding process significantly enhances the electrochemical activity of the Mn 2+ /Mn 3+ redox pair. Mechanistic analysis further indicated that two-stage high-energy grinding effectively reduces particle size, thereby improving lithium-ion diffusion kinetics and forming a uniform and continuous carbon conductive network that enhances electronic conductivity. This enables the discharge capacity of the Mn 2+ /Mn 3+ redox pair in LiMn 0.8 Fe 0.2 PO 4 to be fully exploited. Overall, this work provides valuable theoretical insights into the controllable solid synthesis and performance optimization of phosphate-based cathode materials. Graphical abstract The mechanism underlying the enhanced performance of LiMn 0.8 Fe 0.2 PO 4 .
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DOI
高影响因子
JOURNAL OF POWER SOURCES
·
2024
·
IF 8.1
Yixuan Zhang,Guo-Qiang Liu,Danlei Qiao,Jiaguan Chen,Qiang Sun,Lei Wen
This work focuses on the effect of the of Mn 3+ /Mn 4+ ratio in the reactants on the structure and electrochemical properties of NaMn 0.9 Cu 0.1 O 2 cathode materials for sodium-ion batteries. By systematically varying the manganese valence states in the reactants, we observed a phase transition from the β-phase to the P2-phase with increasing Mn 3+ concentrations in the reactants, contrary to the expected favorability of the β-phase at higher Mn 3+ levels. This finding suggests a complex interplay between the valence states of the reactants and phase formation mechanisms, which needs further investigation. Additionally, electrochemical testing indicated that the phase composition significantly impacts the electrochemical performance of the material. Specifically, the M0 sample, possessing the optimal P2/β ratio, exhibited excellent electrochemical performances, achieving a high initial discharge capacity of 155.1 mA h g −1 and remains 88.1 % after 40 cycles. These results emphasize the importance of precursor selection and valence management in the development of high-performance cathode materials for sodium-ion batteries.
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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无机化学
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固态化学
✓ 已验证
DOI
高影响因子
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
·
2022
·Vol. 61
·期 18
·e202117201
·
IF 16.823
Jiaqi Si,Guofeng Zhao,Weidong Sun,Jincun Liu,Cairu Guan,Yong Yang,Xue-Rong Shi,Yong Lu
Graphical For the oxidative coupling of methane (OCM) reaction, the MnO x -Na 2 WO 4 /SiO 2 catalyst enriched with Q 2 units in the SiO 2 carrier achieves 23 % CH 4 conversion and 72 % C 2–3 selectivity at 660 °C. A large number of Q 2 units in MnO x -Na 2 WO 4 /SiO 2 is a trigger for markedly lowering the light-off temperature of the Mn 3+ ↔Mn 2+ redox cycle because of the easy formation of MnSiO 3 . Oxidative coupling of methane (OCM) catalyzed by MnO x -Na 2 WO 4 /SiO 2 has great industrial promise to convert methane directly to C 2–3 products, but its high light-off temperature is the most challenging obstacle to commercialization and its working mechanism is still a mystery. We report the discovery of a low-temperature active and selective MnO x -Na 2 WO 4 /SiO 2 catalyst enriched with Q 2 units in the SiO 2 carrier, being capable of converting 23 % CH 4 with 72 % C 2–3 selectivity at 660 °C. From experiments and theoretical calculations, a large number of Q 2 units in the MnO x -Na 2 WO 4 /SiO 2 catalyst is a trigger for markedly lowering the light-off temperature of the Mn 3+ ↔Mn 2+ redox cycle involved in the OCM reaction because of the easy formation of MnSiO 3 . Notably, the MnSiO 3 formation proceeds merely through the SiO 2 -involved reaction in the presence of Na 2 WO 4 : Mn 7 SiO 12 +6 SiO 2 ↔7 MnSiO 3 +1.5 O 2 . The Na 2 WO 4 not only drives the light-off of this cycle but also gets it working with substantial selectivity toward C 2–3 products. Our findings shine a light on the rational design of more advanced MnO x -Na 2 WO 4 based OCM catalysts through establishing new Mn 3+ ↔Mn 2+ redox cycles with lowered light-off temperature.
研究领域:
催化化学
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材料科学
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能源化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）