MICROCHEMICAL JOURNAL
·
2023
·
IF 4.8
Zanling Huang,Shuqi Zhu,Abebe Reda Woldu,Wenhua Gao,Jing-Xin Jian,Paul K. Chu,Qing-Xiao Tong,Liangsheng Hu
Electrochemical glucose detection co-catalyzed by bimetallic ions is carried out by introducing Co(II) and Cu(II) into the alkaline solution. The technique avoids the complicated electrode design and catalyst poisoning. By using nitrogen-doped carbon nanotubes (NCNT) loaded on carbon cloth (CC) as the working electrode, the bimetal co-catalytic system achieves a sensitivity of 6,909 mA M −1 cm −2 , a detection limit of 0.4 μM (S/N = 3), as well as good selectivity and stability. By performing systematic electrochemical and structural analysis, the mechanism of Co(II) and Cu(II) co-catalysis for glucose detection in the solution is elucidated. Co(II) supplies the dynamic reaction sites and source of active intermediate (CoOOH), while Cu(II) promotes the formation of CoOOH. The results provide mechanistic insights into bimetal co-catalysis of glucose detection and other electrochemical reactions .
研究领域:
电化学
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材料科学
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分析化学
✓ 已验证
DOI
高影响因子
Small Methods
·
2019
·Vol. 4
·期 2
·1900753
·
IF 0
Jipeng Liu,Liwei Dong,Dongjiang Chen,Yupei Han,Yifang Liang,Mengqiu Yang,Jiecai Han,Chunhui Yang,Weidong He
Metal oxides are arguably a promising solution to next-generation high-energy-density anode materials. In particular, molybdenum oxides own high theoretical specific capacity (1117 and 838 mA h g −1 for MoO 3 and MoO 2 , respectively), high chemical stability, and low cost. The low electronic conductivity of MoO 3 limits their charge–discharge rate performances and delithiation capability. By controlling the valence state of MoO x with carbon, partial MoO 3 can be reduced to MoO 2 with low electrical resistance and high-rate capacity. Nonetheless, both molybdenum oxides undergo large-volume expansion/shrinkage and even pulverization in the lithiation/delithiation process. Herein, through a facile pyrolysis method a MoO x /N-doped carbon nanotube (NCNT) anode with controllable valence states of Mo is designed. The high conductivity and flexibility of the NCNT matrix form a stable MoO 2 /MoO 3 anode with finely matched lattices and coordinated 3d electrons. Owing to molecularly close contact between electron-rich CNTs and MoO x , MoO x /NCNTs own a high conductivity of 0.36 S cm −1 , and mitigate the volume expansion in charges and discharges. The MoO 3 /MoO 2 /NCNTs anode delivers an unparalleled high gravimetric capacity of 970 mA h g −1 , over 100-cycle stability and high rate capability.
研究领域:
材料科学
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电化学
✓ 已验证
DOI
Nanomaterials
·
2021
·Vol. 11
·期 12
·3273
·
IF 5.076
Kunjie Wang,Jiahui Zhang,Yachen Ye,Hongbin Ma,Bingxin Liu,Peng Zhang,Benhua Xu
1T-phase molybdenum disulfide is supposed to be one of the non-precious metal-based electrocatalysts for the hydrogen evolution reaction with the highest potential. Herein, 1T-MoS2nanosheets were anchored on N-doped carbon nanotubes by a simple hydrothermal process with the assistance of urea promotion transition of the 1T phase. Based on the 1T-MoS2nanosheets anchored on the N-doped carbon nanotubes structures, 1T-MoS2nanosheets can be said to have highly exposed active sites from edges and the basal plane, and the dopant N in carbon nanotubes can promote electron transfer between N-doped carbon nanotubes and 1T-MoS2nanosheets. With the synergistic effects of this structure, the excellent 1T-MoS2/ N-doped carbon nanotubes catalyst has a small overpotential of 150 mV at 10 mA cm−2, a relatively low Tafel slope of 63 mV dec−1, and superior stability. This work proposes a new strategy to design high-performance hydrogen evolution reaction catalysts.Keywords:1T-MoS2nanosheets;N-doped carbon nanotubes;hydrogen evolution reaction;water splitting;synergy effects
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ADVANCED MATERIALS
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2019
·Vol. 31
·期 11
·1808341
·
IF 25.809
Wanbing Gong,Yue Lin,Chun Chen,Mohammad Al-Mamun,Hai-Sheng Lu,Guozhong Wang,Haimin Zhang,Huijun Zhao
Biomass is the most abundant renewable resource on earth and developing high-performance nonprecious selective hydrogenation (SH) catalysts will enable the use of biomass to replace rapidly diminishing fossil resources. This work utilizes ZIF-67-derived nitrogen-doped carbon nanotubes to confine Co nanoparticles (NPs) with Co–N x active sites as a high-performance SH catalyst. The confined Co NPs with Co–N x exhibit excellent catalytic activity, selectivity, and stability toward a wide range of biomass-derived compounds. Such active sites can selectively hydrogenate aldehyde, ketone, carboxyl, and nitro groups of biomass-derived compounds into value-added fine chemicals with 100% selectivity. The reported approach could be adopted to create other forms of catalytically active sites from other nonprecious metals.
研究领域:
催化化学
·
可再生资源化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF CHROMATOGRAPHY A
·
2019
·
IF 3.858
Hui Chen,Chuanhui Huang,Wenming Zhang,Qingqing Ding,Jia Gao,Lan Zhang
An easy-prepared adsorbent with high stable and good dispersibility is especially valuable for the development of magnetic solid-phase extraction (MSPE) techniques. In this study, magnetic nitrogen-doped carbon nanotube cages (N-CNTCs) were synthesized via direct carbonization of cobalt (II)-containing metal-organic frameworks. During carbonization, cobalt ions inside the MOFs were converted into magnetic functional nanoparticles of N-CNTCs. Simultaneously, large amounts of nitrogen, originating from the organic ligands, were doped into the carbon framework. This unique structure gave the N-CNTCs excellent chemical stability, high affinity, and good dispersibility. The synthesized magnetic N-CNTCs were then used for MSPE of okadaic acid (OA) from aquatic samples. A simple, efficient, and sensitive method for detecting and quantitating OA was developed by combining the above sample pretreatment technique with high-performance liquid chromatography -tandem mass spectrometry (HPLC-MS/MS). The resulting method boasts a linear dynamic range of 3.0–1000.0 pg mL −1 with good linearity (R 2 ≥ 0.9994). The limit of detection (LOD) and limit of quantification (LOQ) were 1.3 pg mL −1 and 3.0 pg mL −1 , respectively. Several shellfish and seafood samples were analyzed using the developed method, showing satisfactory recoveries (82.0–107.0%) and relative standard deviations (<4.5%). The developed method was also used to investigate the OA distribution in crab tissues. Our results demonstrate that magnetic N-CNTCs are promising adsorbents for providing reliable support for the early warning and tracing to the source of algae toxins.
研究领域:
分析化学
·
环境科学
·
毒理学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
BIOSENSORS & BIOELECTRONICS
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2018
·
IF 8.173
Haifeng Zhou,Guoxia Ran,Jean-Francois Masson,Chan Wang,Yuan Zhao,Qijun Song
Biosensors based on converting the concentration of analytes in complex samples into single electrochemical signals are attractive candidates as low cost, high-throughput, portable and renewable sensor platforms. Here, we describe a simple but practical analytical device for sensing an anticancer drug in whole blood, using the detection of methotrexate (MTX) as a model system. In this biosensor, a novel carbon-based composite, tungsten phosphide embedded nitrogen-doped carbon nanotubes (WP/N-CNT), was fixed to the electrode surface that supported redox cycling. The electronic transmission channel in nitrogen doped carbon nanotubes (N-CNT) and the synergistic effect of uniform distribution tungsten phosphide (WP) ensured that the electrode materials have outstanding electrical conductivity and catalytic performance. Meanwhile, the surface electronic structure also endows its surprisingly reproducible performance. To demonstrate portable operation for MTX sensing, screen printing electrodes (SPE) was modified with WP/N-CNT. The sensor exhibited low detection limits (45 nM), wide detection range (0.01–540 μM), good selectivity and long-term stability for the determination of MTX. In addition, the technique was successfully applied for the determination of MTX in whole blood.
研究领域:
生物传感
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材料科学
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医学检测
✓ 已验证
产品关联
DOI
PubMed
高影响因子
WATER RESEARCH
·
2021
·
IF 11.236
Chenying Zhou,Peng Zhou,Minglu Sun,Yang Liu,Heng Zhang,Zhaokun Xiong,Juan Liang,Xiaoguang Duan,Bo Lai
The sluggish kinetics of Fe(II) recovery strongly impedes the scientific progress of Fenton reaction (Fe(II)/H 2 O 2 ) towards practical application. Here, we propose a novel mechanism that metal-free nitrogen-doped carbon nanotubes (NCNT) can enhance Fenton chemistry with H 2 O 2 as electron donors by elevating the oxidation potential of Fe(III). NCNT remarkably promotes the circulation of Fe(III)/Fe(II) to produce hydroxyl radical ( • OH) with excellent stability for multiple usages (more than 10 cycles) in the NCNT/Fe(III)/H 2 O 2 system. Although carbonyl on NCNT can act as the electron supplier for Fe(III) reduction, the behavior of NCNT is distinct from common reductants such as hydroxylamine and boron. Electrochemical analysis and density functional theory calculation unveil that nitrogen sites of NCNT can weakly bind with Fe(III) to elevate the oxidation potential of Fe(III) (named near-free Fe(III), primarily FeOH 2+ ) at pH ranging from 2.0 to 4.0. Without inputs of external stimulations or electron sacrificers, near-free Fe(III) can promote H 2 O 2 induced reduction of Fe(III) to initiate Fenton chain reactions for long-lasting generation of • OH. To our delight, it is a common property of N-doped carbon materials (e.g., graphene, carbon nanofibers, and acetylene black), our research thus provides a novel, sustainable, and green strategy for promoting Fenton chemistry.
研究领域:
环境科学
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材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF APPLIED PHYSICS
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2018
·Vol. 124
·期 17
·
IF 2.176
Ye Xianzhu,Li Ming,Li Daoru,Li Bin,Zhang Yafei
The development of a material with high ampacity to allow current to flow through narrow channels is one of the most promising ways to address the progressive miniaturization and light weight of electronic devices. The efficient synergistic electron transmission by compounding 1D/2D carbon materials with a metal matrix via various methods in recent years has attracted great research interest due to their potential utilization in electronics. In this study, a copper (Cu) matrix with a 3D nitrogen (N) doped-multi-walled carbon nanotubes (MCNTs) interface with prominent physical features is reported and fabricated, involving the use of nano-self-assembly-heat-modification by adopting polyethyleneimine-nano-Cu and carboxyl MCNTs. Young's modulus was enhanced from 28.8 to 92.2 GPa due to a higher efficiency of stress transfer and interfacial adhesion, and the hardness fitted by Gauss distribution was increased by ∼69% (∼39.7 HRC). Toward the stability after a modification of vacuum reduction sintering, the initial oxidation temperature (T d ) was increased largely from 232 °C to 286 °C, and thermal conductivity was enhanced eminently from 358 to 548 W/(m K) due to more efficient electron/phonon motion. Moreover, synergistic electron transmission endowed the final Cu-N-CNTs with a higher ampacity (7.23–16.98 × 10 4 A cm −2 ), which could be further observed by the time-evolution of electrical resistivity under a constant current density. The improved physical features state that the assembled 3D N-CNTs interface possesses prominent characteristics and potential for directing the deep applications of 1D or 2D carbon materials in electronic science.
研究领域:
材料科学
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电子工程
✓ 已验证
DOI
高影响因子
JOURNAL OF POWER SOURCES
·
2014
·
IF 5.211
Zonghua Pu,Qian Liu,Chun Tang,Abdullah M. Asiri,Abdullah H. Qusti,Abdulrahman O. Al-Youbi,Xuping Sun
In this communication, we report on the solvothermal preparation of spinel ZnCo 2 O 4 /N-doped carbon nanotube (ZnCo 2 O 4 /NCNT) composite. As a novel oxygen reduction reaction (ORR) electrocatalyst , the ZnCo 2 O 4 /NCNT composite shows high activity via a four-electron pathway in alkaline solution. Such catalyst also exhibits superior methanol tolerance ability and durability over commercial Pt/C catalyst.
研究领域:
材料科学
·
电化学
·
纳米科技
·
催化化学
·
能源材料
✓ 已验证
DOI
高影响因子
ACS Applied Energy Materials
·
2018
·
IF 0
Sobia Dilpazir,Hongyan He,Zehui Li,Meng Wang,Peilong Lu,Rongji Liu,Zhujun Xie,Denglei Gao,Guangjin Zhang
Novel Co atoms immobilized carbon nanotubes (CoSAs@CNTs) are synthesized by structural engineering of the zeolitic imidazolate framework (ZIF-67) upon treatment with dicyandiamide (DCD). A unique morphology and promising electrochemical performance are shown by the Co atoms immobilized CNTs. The electrocatalyst remarkably exhibits a highly positive onset potential of 0.99 V and half-wave potential of 0.86 V, both even more positive than the commercial Pt/C catalyst, and the current density is also greater than that of the Pt/C catalyst in alkaline media. A decent performance is observed in acidic media also. The electrocatalyst is extraordinarily stable to harsh environments. A promising performance for the oxygen evolution reaction (OER) is demonstrated by the electrocatalyst, while for bifunctional electrocatalysis a small overvoltage of 0.78 V is observed with onset potential at the lower overpotential of 300 mV announcing the advantage of its usage for practical energy conversion and storage systems. This novel study may provide a new road map for fuel cell technology.
研究领域:
材料科学
·
电化学
·
能源转换与存储
✓ 已验证
DOI
CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Xinling Zhang,Yongxiao Tuo,Qing Lu,Yuanyuan Liu,Jiabing Luo,Hui Zhang,Jingyuan Shang,Yan Zhou,Jun Zhang
The impact of carbon material curvature is often underestimated in studies of carbon-based electrocatalysts for the CO 2 reduction reaction (CO 2 RR). To clarify its role, we tuned the diameter of nitrogen-doped carbon nanotube (NCNT) by controlling the size of embedded Ni nanoparticles (50 to 120 nm), in which the Ni-modified C-N species has been identified as an efficient site for CO 2 RR to CO. We found that the FE CO and TOF increase with the curvature of NCNT, particularly in the high potential window that is the diffusion-limited region. This enhancement is attributed to accelerated CO desorption since the electrophobic nature of high-curvature C-N defects reduces hybridization between *CO and active sites. These insights highlight curvature engineering as a promising strategy to enhance CO current density in carbon-based electrocatalysts.
研究领域:
材料科学
·
电化学
·
催化科学
✓ 已验证
产品关联
DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2025
·
IF 3.9
Ye Li,Xuping Sun,Huiyong Wang,Baozhan Zheng,Juan Du
Electrochemical nitrite (NO2–) reduction provides an alternative pathway for both sustainable ammonia (NH3) synthesis and reutilization of NO2– pollutants, but this process requires high activity and selective catalysts. In this work, cobalt nanoparticles encapsulated in N-doped carbon nanotubes supported on carbon cloth (Co@NCNT/CC) as a low-cost electrocatalyst can efficiently catalyze NO2–-to-NH3 conversion. Such Co@NCNT/CC shows exceptional electrocatalytic performance, achieving a maximum NH3 Faradaic efficiency of 94.9% with an NH3 yield of 365.1 μmol h–1 cm–2 at −0.3 V. Remarkably, the assembled Zn–NO2– battery with the Co@NCNT/CC cathode exhibits a peak power density of 4.4 mW cm–2 and a satisfactory NH3 yield of 141.5 μmol h–1 cm–2.
研究领域:
材料科学
·
环境科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）