Science China-Materials
·
2018
·Vol. 61
·期 2
·243-253
·
IF 4.318
Zhou Jinhua,Chen Ningna,Ge You,Zhu Hongli,Feng Xiaomiao,Liu Ruiqing,Ma Yanwen,Wang Lianhui,Hou Wenhua
Flexible and micro-sized energy conversion/ storage components are extremely demanding in portable and multifunctional electronic devices, especially those small, flexible, roll-up and even wearable ones. Here in this paper, a two-step electrochemical deposition method has been developed to coat Ni fibers with reduced graphene oxide and MnO 2 subsequently, giving rise to Ni@reduced-graphene-oxide@MnO 2 sheath-core flexible electrode with a high areal specific capacitance of 119.4 mF cm −2 at a current density of 0.5 mA cm −2 in 1 mol L −1 Na 2 SO 4 electrolyte. Using polyvinyl alcohol (PVA)- LiCl as a solid state electrolyte, two Ni@reduced-grapheneoxide@ MnO 2 flexible electrodes were assembled into a freestanding, lightweight, symmetrical fiber-shaped micro-supercapacitor device with a maximum areal capacitance of 26.9 mF cm −2 . A high power density of 0.1W cm −3 could be obtained when the energy density was as high as 0.27 mW h cm −3 . Moreover, the resulting micro-supercapacitor device also demonstrated good flexibility and high cyclic stability. The present work provides a simple, facile and low-cost method for the fabrication of flexible, lightweight and wearable energy conversion/storage micro-devices with a high-performance.
研究领域:
材料科学
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能量存储与转换
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纳米技术
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电化学
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柔性电子学
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DOI
高影响因子
IONICS
·
2018
·Vol. 24
·期 10
·3177-3186
·
IF 2.347
Li Su-Juan,Lv Meng-Meng,Meng Jing-Jing,Zhao Ling-Zhi
A novel 3D composite of gold nanoparticle (AuNP)-decorated MnO 2 -graphene (GP)-carbon nanotube (CNT)-modified glassy carbon electrode (GCE) was fabricated by drop casting the as-synthesized AuNP/MnO 2 -GP-CNT suspension onto the surface of GCE. Scanning electron microscopy (SEM) and transmission electron microscopy (TEM) images indicate the successful formation of AuNPs/MnO 2 -GP-CNT composite step by step from the precursor of CNTs. The cyclic voltammetry (CV) results show the AuNPs/MnO 2 -GP-CNTs/GCE exhibits superior electrocatalytic activity towards oxidation of nitrite in a 0.1 M phosphate-buffered saline (PBS, pH 7.0) compared to the MnO 2 -GP-CNTs/GCE. The result of amperometric response indicates that the AuNPs/MnO 2 -GP-CNTs/GCE can be used to determine nitrite concentration in a wide linear range of 1.0 and 2896 μM with a detection limit of 0.05 μM. The developed method can be successfully applied for determination of nitrite in water samples.
研究领域:
分析化学
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纳米材料科学
·
环境科学
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产品关联
DOI
高影响因子
JOURNAL OF ELECTRONIC MATERIALS
·
2021
·Vol. 50
·期 8
·4557-4566
·
IF 1.938
Liu Gu,Zhang Yukun,Xu Kejun,Wang Liuying,Xiong Shanxin
Composite supercapacitive materials can combine two different kinds of electrode materials with different energy storage mechanisms, as well as present enhanced supercapacitive performance. In this paper, a reduced graphene oxide aerogel (GA) was prepared with an adjustable pore structure and used as a matrix for loading of secondary active material (MnO 2 ) through an electrochemical deposition method. The influences of the deposition time and deposition voltage on the electrochemical behaviors and specific capacitances of MnO 2 /GA composites were studied. The unique three-dimensional porous structure of GA can act as a good matrix for MnO 2 . The results show that when the deposition time is 30 s and deposition voltage is 1.0 V, the MnO 2 /GA composite has the highest specific capacitance of 664 F/g at a current density of 1 A/g. Compared with neat GA, the specific capacitance of the MnO 2 /GA composite is enhanced by 190%, which can be assigned to the co-contribution of two kinds of active materials, a facile ion diffusion path through the porous structure, and good electron conductivity of the GA.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
ANALYTICA CHIMICA ACTA
·
2021
·
IF 6.558
Meiyan Zhu,Xiaotong Dong,Ming Li,Liangbin Jia,Ye Ma,Minggang Zhao,Hongzhi Cui
Detection of pollutants in seawater faces a great challenge of strong interference, and the facile detection method is lacked. The CoMn 2 O 4 /β-MnO 2 p-n junction oxidase mimetics were successfully prepared for colorimetric detection of hydroquinone in seawater. The catalysis ability was enhanced significantly by the photo-induced p-n junction interface effect. It not only promoted the formation of H 2 O 2 by suppressing the recombination of photon-generated carriers, but also provided the driving force for electron transport . The colorimetric detection of hydroquinone was achieved by fading and exhibited good adaptability in seawater. The obtained good recovery rate (97.23%–101.37%) in seawater makes it an inspiring method for practical application. The photo-induced p-n junction interface effect provides an opportunity for developing the application of colorimetric sensing in seawater detection.
研究领域:
环境科学
·
分析化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Nano
·
2021
·
IF 15.881
Jiangqi Zhao,Zhengjie Xu,Zhan Zhou,Shibo Xi,Yunpeng Xia,Qingyong Zhang,Lanqin Huang,Liang Mei,Yue Jiang,Jinwei Gao,Zhiyuan Zeng,Chaoliang Tan
The booming market of portable and wearable electronics has aroused the requests for advanced flexible self-powered energy systems featuring both excellent performance and high safety. Herein, we report a safe, flexible, self-powered wristband system by integrating high-performance zinc-ion batteries (ZIBs) with perovskite solar cells (PSCs). ZIBs were first fabricated on the basis of a defective MnO2–x nanosheet-grown carbon cloth (MnO2–x@CC), which was obtained via the simple lithium treatment of the MnO2 nanosheets to slightly expand the interlayer spacing and generate rich oxygen vacancies. When used as a ZIB cathode, the MnO2–x@CC with a ultrahigh mass loading (up to 25.5 mg cm–2) exhibits a much enhanced specific capacity (3.63 mAh cm–2 at current density of 3.93 mA cm–2), rate performance, and long cycle stability (no obvious degradation after 5000 cycles) than those of the MnO2@CC. Importantly, the MnO2–x@CC-based quasi-solid-state ZIB not only achieves excellent flexibility and an ultrahigh energy density of 5.11 mWh cm–2 (59.42 mWh cm–3) but also presents a high safety under a wide temperature range and various severe conditions. More importantly, the flexible ZIBs can be integrated with flexible PSCs to construct a safe, self-powered wristband, which is able to harvest light energy and power a commercial smart bracelet. This work sheds light on the development of high-performance ZIB cathodes and thus offers a good strategy to construct wearable self-powered energy systems for wearable electronics.
研究领域:
材料科学
·
能源技术
·
纳米科技
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ELECTROCHIMICA ACTA
·
2020
·
IF 6.215
Tian Cen,Liang Chen,Xuejun Zhang,Yanhong Tian,Xinxiao Fan
In the study, a novel fiber-shaped asymmetric supercapacitor with high specific capacitance has been successfully constructed by twisting two self-made composite electrodes. Prior to manufacturing these electrodes, carbon nanotube is first deposited on carbon fiber by electrophoretic deposition to obtain carbon fiber/carbon nanotube composites. Subsequently, the positive and negative composite electrodes are prepared by the electrochemical deposition of manganese dioxide and electrochemical polymerization of polypyrrole, respectively. As a result, the novel fiber-shaped asymmetric supercapacitor performs a wide potential window of 1.7 V and a high energy density of 22.8 μWh cm −1 at the current density of 0.5 A g −1 . Meanwhile, it still maintains great capacitance retention of 91.6% and 86.1% from 500 bending repetitions and 5000 cycles, respectively, which is due to the excellent flexibility and long cycle life. It is significant that the promising performance of the novel fiber-shaped asymmetric supercapacitor is of greatly potential for portable and wearable electronics in the future.
研究领域:
材料科学
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能源存储
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2021
·
IF 7.46
Qian Su,Lanlan Gan,Ying Zhu,Xiaoming Yang
The current fluorescence assays are generally restricted by their background fluorescence and scattering light, thus room temperature phosphorescence (RTP) materials show the promising prospect towards biosensing. Herein, a facile strategy has been proposed to synthesize carbon dots (CDs) with blue fluorescence, which further achieved emitting phosphorescence in aqueous environment by cooperating with cyanuric acid (CA). Significantly, the dual-emissive fluorescence and phosphorescence of CA-CDs could be obviously quenched by manganese dioxide nanosheets through F o ¨ rster resonance energy transfer and dynamic quenching effect. On the basis of the generation of hydrogen peroxide by enzyme catalyzing the corresponding substrate, a universal sensing platform for detecting cholesterol and glucose was originally established. To be specific, the linear ranges were 0.02625∼2.1 mg mL −1 for cholesterol sensing, and 0.1∼20 mM for the detection of glucose, which exhibited general agreement with the physiological range, thus may broaden the avenue of assaying other targets.
研究领域:
分析化学
·
材料科学
·
生物化学
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产品关联
DOI
高影响因子
POLYMER BULLETIN
·
2018
·Vol. 76
·期 8
·3971-3987
·
IF 1.589
Chen Xiuqiong,Yan Huiqiong,Sun Wei,Shi Zaifeng,Zhang Wei,Lei Mengyuan,Zhang Pan,Lin Qiang
Since the direct electron transfer of myoglobin (Mb) is hardly realized on the bare electrode, the electrodeposition of the mixture of novel MnO 2 –C composite microsphere, sodium alginate (SA) and Mb on the surface of the carbon ionic liquid electrode (CILE) was conducted to fabricate the modified electrode, denoted as Nafion/Mb–SA–MnO 2 –C/CILE. The biological activity of Mb in the Mb–SA–MnO 2 –C composite was confirmed by FTIR and UV–Vis absorption spectra. The fabricated Nafion/Mb–SA–MnO 2 –C/CILE exhibited a fast electron transfer process with a pair of well-defined redox peaks attributed to the excellent electrochemical property of MnO 2 –C composite microsphere and good biocompatibility of SA that could provide Mb suitable microenvironment to keep its biological activity and facilitate the electron transfer. Additionally, the modified electrode also exhibited a wider linear range and a low detection limit toward the electrocatalytic reduction in trichloroacetic acid with good stability, reproducibility and accurate detection for the real samples.
研究领域:
生物化学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF CHEMICAL SCIENCES
·
2020
·Vol. 132
·期 1
·1-10
·
IF 1.406
Zhao Lingzhi
Abstract The development of efficient methods for alkaline phosphatase (ALP) activity assay is of great importance in clinical diagnosis and many biomedical applications. In this work, the authors create two strategies for colorimetric detection of ALP activity. The first strategy is developed by using directly manganese dioxide (MnO 2 ) nanosheets as colorimetric probes. The second strategy is developed by using MnO 2 and the chromogenic substrate 3,3′,5,5′-tetramethylbenzidine (TMB) as colorimetric probes based on the catalytic reduction of oxidized TMB. The first strategy has a linear response in 10 U L −1 to 80 U L −1 with 3.0 U L −1 detection limit while the second one has a linear response in 7 U L −1 to 100 U L −1 with 0.05 U L −1 detection limit. The method based on MnO 2 -TMB which have lower detection limit and higher sensitivity was applied to monitor ALP activity in whole Hela cells lysate. In addition, based on redox properties, MnO 2 -TMB sensing system was successfully used in detecting reducing substances such as ascorbic acid, Na 2 S and so forth. Conceivably, MnO 2 -TMB sensing system is not limited to ALP activity assay but has a wide scope to be applied in assays of the total antioxidant capacity of dietary substances and biological fluids. Graphic Abstract Two strategies were created for colorimetric detection of ALP activity: The first strategy is developed by using directly manganese dioxide (MnO 2 ) nanosheets as colorimetric probes, and the second strategy by using MnO 2 and the chromogenic substrate 3,3′,5,5′-tetramethylbenzidine (TMB) as colorimetric probes based on the catalytic reduction of oxidized TMB.
研究领域:
分析化学
·
生物化学
·
生物医学工程
·
临床诊断
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产品关联
DOI
高影响因子
BIOCONJUGATE CHEMISTRY
·
2020
·
IF 4.031
Atheer Hameid Odda,Hailiang Li,Naveen Kumar,Naseeb Ullah,Malik Ihsanullah Khan,Gang Wang,Kuang Liang,Tan Liu,Yue-Yin Pan,An-Wu Xu
Exploring a combined phototherapeutic strategy to overcome the limitations of a single mode therapy and inducing high anticancer efficiency is highly promising for precision cancer nanomedicine. However, a single-wavelength laser activates dual photothermal/photodynamic therapy (PTT/PDT) treatment is still a formidable challenge. Herein, we strategically design and fabricate a multifunctional theranostic nanosystem based on chlorin e6-functionalized polydopamine (PDA) coated prussian blue/manganese dioxide nanoparticles (PB-MnO2@PDA-Ce6 NPs). Interestingly, the obtained PB-MnO2@PDA NPs not only offer an effective delivery system for Ce6 but also provide strong optical absorption in the near-infrared range, endowing high antitumor efficacy of PTT. More importantly, the as-prepared PB-MnO2@PDA-Ce6 nanoagents exhibit an effective oxygen generation, superior reactive oxygen species (ROS), and outstanding photothermal conversion ability to greatly improve PTT and PDT treatments. As a result, both in vitro and in vivo treatments guided by MR imaging on liver cancer cells reveal the complete cell/tumor eradication under a single wavelength of 660 nm laser irradiation, implying the simultaneous synergistic PDT/PTT effects triggered by PB-MnO2@PDA-Ce6 nanoplatform, which are much higher than individual treatment. Taken together, our phototherapeutic nanoagents exhibit an excellent therapeutic performance, which may act as a nanoplatform to find safe and clinically translatable routes to accelerate cancer therapeutics.
研究领域:
纳米医学
·
肿瘤学
·
生物材料
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Applied Materials & Interfaces
·
2020
·
IF 8.758
Yuanyuan Hu,Ping Shen,Na Zeng,Lulu Wang,Di Yan,Lulu Cui,Kai Yang,Cuiping Zhai
Multifunctional metal–organic supramolecular hydrogels have achieved great progress nowadays. However, their applications in aqueous batteries for flexible energy storage devices remain limited due to their unsatisfactory mechanical properties. Here, we report a rapid formation of supramolecular hydrogel by adenosine 5′-monophosphate (AMP) and manganese ions (Mn2+). Additionally, the AMP–Mn hydrogel is combined with chemical cross-linking poly(vinyl alcohol) (PVA) polymer networks to form an AMP–Mn/PVA hybrid hydrogel, which effectively solves the problems with regard to the mechanical properties and stability of metal–organic supramolecular hydrogels as well as self-healing of tough chemical cross-linking polymer networks. The AMP–Mn/PVA hybrid hydrogel served as the hydrogel electrolyte to fabricate flexible Zn–MnO2 batteries, which exhibit fast ion conductivity, excellent electrochemical stability, and robust mechanical strength, indicating feasible practical application prospects. This investigation provides a promising opportunity for the application of metal–organic supramolecular hydrogels in the field of energy storage.
研究领域:
材料科学
·
能源存储
·
化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
RARE METALS
·
2023
·
IF 8.8
Zhuang Wen-Chang,Zhang Hai-Yue,Chen Zhen-Yang,Cheng Wen-Jing,Na Wei-Dan,Li Zhao,Tian Lin
Paper-based sensing platform is a point of need analytical toolkit for safety testing. However, the sensitivity, specificity, and simplicity are still challenging. Herein, we report a novel strategy (Au/δ-MnO 2 hollow nanosphere and 3,3′,5,5′-tetramethylbenzidine (TMB) induced test strips for signal-on detection) that can be utilized for hexavalent chromium (Cr 6+ ) detection. Interestingly, Cr 6+ (CrO 4 2− ) as a smart switch can remarkably enhance the oxidase-like activity of Au/δ-MnO 2 hollow nanosphere. The presence of Cr 6+ can regulate the surface electronic redistribution of Au/δ-MnO 2 and adjust the geometric configuration, which leads to the improvement in oxidase-like activity of Au/δ-MnO 2 . As a proof-of-concept application, a visual paper-based sensing platform of Cr 6+ along with quantitative analysis by the test strips was successfully constructed. This paper-based sensing platform exhibits a linear range with excellent selectivity for other interfering substances and lower limit of detection of 0.09 μmol·L −1 , providing a promising toolkit at-home Cr 6+ measurement and environmental monitoring. Graphical abstract
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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）