TALANTA
·
2020
·
IF 5.339
Xiaoya Bi,Lijun Luo,Libo Li,Xiaohong Liu,Bainian Chen,Tianyan You
A new fluorescence aptasensor for Ochratoxin A (OTA) analysis in corn and barley flour was developed owing to the favourable quenching function of cobalt oxyhydroxide (CoOOH) nanosheets . The first combination of graphitic carbon nitride quantum dots (g-CNQDs) and CoOOH nanosheets as efficient energy donor-acceptor pair was reported, and the quenching mechanism was proved by investigating the fluorescence lifetime of g-CNQDs. The aptamer-modified g-CNQDs (g-CNQDs-apt) were adsorbed onto CoOOH nanosheets surface by van der Waals force . Consequently, the Förster resonance energy transfer (FRET) from g-CNQDs-apt to CoOOH nanosheets was initiated, leading to quenched fluorescence. With the addition of OTA, the linear aptamer specifically bound with OTA to form G-quadruplex, which had relatively weak interaction with the CoOOH nanosheets and separated from the nanosheets surface. Thus, the FRET process between g-CNQDs-apt and CoOOH nanosheets was hindered, leading to the fluorescence of g-CNQDs-apt recovered clearly. The developed aptasensor exhibited acceptable detection limit with 0.5 nM and desirable linear relationship from 1 nM to 140 nM. Meanwhile, the aptasensor possessed multiple advantages, including easy operation, rapid detection and high selectivity . Moreover, the aptamer sensing platform was favorably applied for OTA determination in cereal (barley and corn flour), in which the recoveries varied from 94.5% to 101% with the relative standard deviation under 2.24%.
研究领域:
分析化学
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食品科学
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纳米技术
·
毒理学
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产品关联
DOI
PubMed
高影响因子
Nano Research
·
2023
·Vol. 16
·期 8
·10810-10821
·
IF 9.9
Ren Jinhong,Liu Jie,Du Yunmei,Li Shuangshuang,Wang Mengmeng,Li Bin,Yang Bo,Wang Lei,Liu Yanru
At present, Ru dopants mainly enhance electrocatalytic performance by inducing strain, vacancy, local electron difference, and synergy. Surprisingly, this work innovatively proposes that trace Ru atoms induce dual-reconstruction of phosphide by regulating the electronic configuration and proportion of Co-P/Co-O species, and ultimately activate superb electrocatalytic performance. Specifically, Ru-CoFeP@C/nickel foam (NF) is reconstructed to generate hydrophilic Co(OH) 2 nanosheets during the hydrogen evolution reaction (HER) process, further accelerating the alkaline HER kinetics of phosphide. And the as-formed CoOOH during the oxygen evolution reaction (OER) process directly accelerates the oxygen overflow efficiency. As expected, the overpotential at 100 mA·cm −2 ( η 100 ) values of the reconstructed Ru-CoFeP@C/NF are 0.104 and 0.257 V for HER and OER, which are greatly lower than that of Pt/C-NF and RuO 2 -NF benchmarks, respectively. This work provides guidance for the construction of high-performance catalysts for HER and OER dual reconstruction. This work provides a new idea for the optimization of catalyst structure and electrocatalytic performance.
研究领域:
材料科学
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电化学
·
催化
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF THE SCIENCE OF FOOD AND AGRICULTURE
·
2022
·Vol. 102
·期 14
·6658-6667
·
IF 4.125
Wei Lan,Chengying Hai,Qiong Shi,Shuo Wang,Gaoqiong Deng,Hengye Chen,Youyou Wang,Jian Yang,Haiyan Fu
BACKGROUND Ascorbic acid (AA) is an essential nutrient for humans, which must be obtained from vegetables, fruits, and other foods. The content of AA has become an important standard to evaluate the quality and nutritional value of food. The fluorescence sensing method based on nanomaterials is a good alternative for the rapid detection of AA. In this study, we developed an inner filter effect-based fluorescent probe that hybridized nitrogen-doped carbon dots (NCDs) with cobalt oxyhydroxide nanoflakes (CoOOH NFs). RESULTS An optimal NCDs was successfully selected because it has a strong fluorescence at 430 nm and the most significant quenching phenomenon with CoOOH NFs due to the inner filter effect. When adding AA into the NCDs–CoOOH NFs probe solution, a specific redox reaction will occur between the enediol group of AA and the CoOOH NFs to interfere with the quenching ability of CoOOH NFs and recover the fluorescence of NCDs. The recovered fluorescence intensities demonstrated a linear relationship with the concentrations of AA. The assay based on the NCDs–CoOOH NFs probe allows AA to be tested in a wide range of 5–200 μmol L −1 with a detection limit of 2.31 nmol L −1 . Furthermore, to evaluate its practical application, the NCDs–CoOOH NFs fluorescence probe was utilized to analyze AA in vegetable, fruit, and serum matrixes with satisfactory results. CONCLUSION An inner filter effect-based fluorescence probe for the rapid detection of AA was developed, and it has a good potential to be applied in both food and clinical testing. © 2022 Society of Chemical Industry.
研究领域:
食品科学
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分析化学
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生物医学
✓ 已验证
DOI
PubMed
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2024
·
IF 5.8
Hongyuan Song,Yijia Pang,Linjie Dong,Kun Dong,Haorong Wu,Liangwei Chen,Bin Liu,Zhenhua Ge,Lan Yu
Transition metal oxides are considered ideal electrocatalyst materials due to their low cost and high intrinsic activity. Among them, SrCoO 3- δ has received increasing attention due to its multi-phase structure and tunable electronic properties, though its OER reaction kinetics and catalysis stability are unsatisfactory. Herein, based on a simple one-step solid-state reaction method, we use a small amount of rare earth Y ions (10 %) to transform H-SCO 2.52 from a hexagonal structure to a stable cubic perovskite Sr 0.9 Y 0.1 CoO 3− δ . While broadening the atomic ratio of Co and Fe in the B-site under the cubic perovskite Sr 0.9 Y 0.1 Co 1- x Fe x O 3− δ ( x = 0–1), the relationship between the B-site electronic state, oxygen vacancies, and OER performance has been explored. Sr 0.9 Y 0.1 Co 0.2 Fe 0.8 O 3− δ with a high concentration of oxygen vacancies, exhibits the lowest overpotential of 277 mV and maintains stability at 10 mA cm −2 for 88 h. The valence states of Fe and Co atoms in SYC0.2F0.8 O are optimized (Fe 2+ ∼50.81 %, Co 2+ ∼19.39 %), and the oxygen evolution activity is enhanced by electrochemical reconfiguration to form high-valence Fe and Co ions. Selective leaching of Sr ions via electrochemical surface reconstruction activates FeOOH and CoOOH amorphous layer active sites on the catalyst surface, significantly enhancing reaction kinetics.
研究领域:
材料科学
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电化学
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催化
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry B
·
2023
·Vol. 11
·期 6
·1279-1287
·
IF 7
Haoyu Chen,Zifu Cai,Jialing Gui,Ying Tang,Peng Yin,Xiaohua Zhu,Youyu Zhang,Haitao Li,Meiling Liu,Shouzhuo Yao
In this work, a ratiometric fluorescent nanoplatform for the detection of ascorbic acid (AA) was constructed based on the Ag2S quantum dots (QDs) and multifunctional hydroxyl cobalt oxide nanoflakes (CoOOH NFs). Ag2S QDs can be assembled on the surface of CoOOH NFs by electrostatic adsorption, resulting in the quenching of the NIR fluorescence emission of Ag2S QDs at 680 nm effectively through the inner filter effect (IFE). o-Phenylenediamine (OPD), a common substrate of oxidase-like (OXD) mimic, is rapidly oxidized into the fluorescent product of 2,3-diaminophenazine (DAP) with the appearance of an emission peak at 575 nm under the catalysis of CoOOH NFs. After AA was added, the fluorescence emission of DAP declined because of the decline in the OXD-like activity of CoOOH NFs due to the transformation of Co2+. Simultaneously, Ag2S QDs were released, accompanied by the recovery of red fluorescence. These two fluorescent signals can be excited at the same excitation wavelength, simplifying the detection procedure. Using F575/F680 as the readout, the quantification of AA can be realized with the linear range and detection limit of 0.2 μM–20 mM and 0.014 μM, respectively. The ratiometric fluorescence sensor can be effectively used to determine the content of AA in real samples such as juice and serum. This work integrates the in-situ formation of the fluorescent species via the catalysis of the nanozyme and the redox reaction to destroy the CoOOH NFs nanozyme as well as the two dimensional nanoflake induced turn-off-on strategy for Ag2S QDs, which provides a specific strategy for the selective detection of AA and may offer a reliable approach for the construction of other biosensing platforms.
研究领域:
分析化学
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生物传感
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纳米材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2020
·
IF 7.1
Jinli Li,Lei Jiao,Weiqing Xu,Hongye Yan,Guojuan Chen,Yu Wu,Liuyong Hu,Wenling Gu
Glutathione (GSH) plays a significant role in various biological functions. The fluctuation of GSH level is closely linked to some serious diseases. Currently, the colorimetric detection of GSH is mainly built on the inhibitory effect on the catalytic activity of the developed nanomaterials . However, tedious synthesis of the nanomaterials is always required to control their morphologies for better catalytic activity. Metal indicators are some specific substances capable of chelating metal ions, during which significant color variation can be triggered, making them promising for colorimetric analysis. More importantly, the recognition of metal ions has nothing to do with the structure of the materials. Herein, CoOOH ultrathin nanosheets were prepared via a facile method, which can be easily reduced to Co 2+ ions by GSH. After being chelated by metal indicator, a rapid and sensitive sensing platform for GSH detection is established with the distinct color change. As a result, the UV–vis absorbances of Co 2+ –xylenol orange disodium salt complexes (a typical metal indicator) at 580 nm exhibit good linearity against GSH concentrations from 33 μM to 1.3 mM with the detection limit of 13.7 μM. The developed sensor is further used in the detection of GSH contained in the human serum and an ideal recovery rate is obtained, demonstrating its excellent applicability for the detection of GSH in practical samples.
研究领域:
分析化学
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纳米技术
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生物传感器
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生物医学工程
✓ 已验证
产品关联
DOI
高影响因子
Green Energy & Environment
·
2021
·
IF 8.207
Qiuyan Jin,Hao Cui,Chengxin Wang
The design of efficient and robust non-precious metal electrocatalysts towards oxygen evolution reaction (OER) is of great value for developing green energy technologies. The in-situ formed high-valence (oxy)hydroxides species during the reconstruction process of pre-catalysts are recognized as the real contributing sites for OER. However, pre-catalysts generally undergo a slow and inadequate self-reconstruction. Herein, we reported a PO 4 3− optimized CoFe-based OER catalysts with amorphous structure, which enables a fast and deep reconstruction during the OER process. The amorphous structure induced by ligands PO 4 3− is prone to evolution and further form active species for OER. The electron interaction between metal sites can be modulated by electron-rich PO 4 3− , which promotes generation of high active CoOOH. Simultaneously, the etching of PO 4 3− from the pre-catalysts during the catalytic process is in favor of accelerating the self-reconstruction. As a result, as-prepared pre-catalyst can generate high active CoOOH at a low potential of 1.4 V and achieve an in-depth reconstructed nanosheet structure with abundant OER active sites. Our work provides a promising design of pre-catalysts for realizing efficient catalysis of water oxidation.
研究领域:
材料科学
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电化学
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催化
·
能源材料
✓ 已验证
产品关联
DOI
高影响因子
Nano-Micro Letters
·
2020
·Vol. 12
·期 1
·1-16
·
IF 12.264
Zhang Shucong,Wang Wenbin,Hu Feilong,Mi Yan,Wang Shuzhe,Liu Youwen,Ai Xiaomeng,Fang Jiakun,Li Huiqiao,Zhai Tianyou
The 2D CoOOH sheet-encapsulated Ni 2 P into tubular arrays electrocatalytic system with expediting mass transport, structural stability, and tuned electron was conceptually proposed.
The designed electrocatalysts realize expectant 1000 mA cm −2 -level-current-density hydrogen evolution in neutral water for over 100 h.
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
Small Methods
·
2019
·Vol. 3
·期 5
·1900113
·
IF 0
Liu Yang,Haoxiang Xu,Huibing Liu,Daojian Cheng,Dapeng Cao
Developing efficient non-precious bifunctional electrocatalysts for oxygen evolution reaction (OER) and hydrogen evolution reaction (HER) is highly critical for overall water splitting. Herein, vertically aligned CoTe and NiTe nanoarrays are synthesized in situ grown on Ni foams (marked as CoTeNR/NF and NiTeNR/NF) via a facile hydrothermal method, and further explore their catalytic activities for overall water splitting. The CoTeNR/NF catalyst exhibits not only excellent OER performance with a low overpotential of 350 mV to deliver 100 mA cm −2 , but also high HER activity only requiring 202 mV overpotential to yield 10 mA cm −2 in alkaline condition. Moreover, experimental technique and density functional theory are combined together to reveal that the real active sites of CoTeNR/NF for OER are from the in situ generated CoOOHspecies on CoTeNR/NF in the OER process, and also propose a new HER performance evaluation criteria of using H 2 O adsorption energy, H 2 O dissociation barrier, and H 2 /OH − desorption energy as an indicator. The new criteria can satisfactorily evaluate the HER performance of as-synthesized samples, while the traditional one of using H adsorption energy as an indicator fails in the HER performance evaluation of as-synthesized samples. It is expected that the new evaluation criteria can be used as a general criteria to evaluate the HER performance of other electrocatalysts.
研究领域:
材料科学
·
电化学
·
催化
·
能源材料
✓ 已验证
产品关联
DOI
FOOD CHEMISTRY
·
2024
·
IF 8.5
Xiaomin Pang,Yongfeng Chen,Rui Gao,Yufeng Sun,Xuguang Qiao,Zhixiang Xu
Herein, a novel electrochemical sensor based on zirconium-doped cobalt oxyhydroxide (ZrCoOOH) was proposed for highly sensitive non-enzymatic determination of malathion (MAL). The doping of Zr can improve the electrical conductivity of CoOOH, of which the transfer resistance was reduced from 241.1 Ω to 140.2 Ω. Furthermore, the X-ray photoelectron spectroscopy confirmed that part of Co 2+ was converted to Co 3+ due to the introduction of Zr. The Co 3+ in ZrCoOOH could react with MAL to form Co 2+ , which enhanced the electrooxidation current of Co 2+ . Therefore, the peak current of Co 2+ was served as detection probe for MAL. Under optimal conditions, the developed sensor established the linear relationship for MAL in the concentration range of 0.001–10.0 μM with a low limit of detection (0.64 nM). The constructed sensor was employed to detect MAL in food samples (peach, kiwi fruit, spinach and tomato), verifying the accuracy and practicability of the sensor.
研究领域:
分析化学
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环境科学
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食品科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
RENEWABLE ENERGY
·
2025
·
IF 9.1
Meihong Fan,Minghao Wang,Wenbo Bi,Yuzhu Jiang,Hui Chen,Xingquan He,Qingqing Pan
The development of efficient and durable alkaline water splitting electrocatalysts is vital for advancing the renewable hydrogen economy, a key pillar of sustainable energy systems. Here, we present an entropy-driven synthesis of phase-pure cobalt boride (CoB) nanosheets by a molten salt-assisted pyrolytic method. The obtained CoB, grown in situ on carbon cloth, can serve as an efficient electrocatalyst toward the hydrogen evolution reaction (HER) and the oxygen evolution reaction (OER) simultaneously. Remarkably, it requires only overpotentials of 110 mV for HER and 240 mV for OER to drive a current density of 10 mA cm −2 , respectively, addressing the critical need for cost-effective catalysts in renewable energy conversion. Experiments in combination with theoretical calculations reveal that interstitial B atoms can modulate the adsorption energy of Co sites and optimize the Co–H bond strength through the electron transfer between Co and B, thereby enhancing intrinsic HER activity. While in the OER, CoB nanosheets undergo in situ transformation into amorphous CoOOH, which acts as the highly active catalytic phase for the OER. This work not only provides a promising bifunctional electrocatalyst for alkaline water splitting but also offers fundamental insights into the catalytic mechanisms, paving the way for rational design of advanced electrocatalysts.
研究领域:
能源材料
·
电化学
·
纳米技术
·
催化
·
材料科学
·
可再生能源
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表面科学
✓ 已验证
产品关联
DOI
高影响因子
ANALYTICAL AND BIOANALYTICAL CHEMISTRY
·
2022
·Vol. 414
·期 9
·2991-3003
·
IF 4.478
Rao Honghong,Li Jianying,Luo Mingyue,Zhang Kehui,Gou Hao,Liu Haixia,Xue Zhonghua
Ratiometric electrochemical assays have been demonstrated to be more sensitive and selective in various sensing events, mainly due to their affordable built-in correction and good self-reference capability. But it is known that complicated modification and labeling operations usually are necessary for the construction of ratiometric electrochemical assays, therefore is a hot and important issue needing consideration carefully. We herein report a new yet simple bare electrode-based ratiometric electrochemical bioassay to achieve sensitive and selective analysis of alkaline phosphatase (ALP), using a liquid phase system that contains CoOOH nanozymes and commercially available indicator substrate. This proposed bioassay works based on the ratiometric change of dual electrochemical signals, arising from an exclusive target ALP-triggered hydrolysis of electrochemical substrate p-nitrophenyl phosphate (PNPP). In this design, the two hydrolyzed products of electrochemically active p-nitrophenol (PNP) and electrochemically inactive phosphate anion (PO 4 3− ) are responsible together for the ratiometric electrochemical analysis of ALP. PNP exhibits a straightforward current response toward ALP content; however, PO 4 3− cannot show a direct electrochemical signal thus is rationally designed to offer an alternative response by linking it with the specific CoOOH nanozyme-catalyzed reaction of 3,3′,5,5′-tetramethylbenzidine (TMB) and H 2 O 2 , in which the nanozyme-catalyzed product oxTMB shows a direct reduction current at the GCE, and significantly decreases with increasing PO 4 3− species due to the good inhibition of PO 4 3− toward CoOOH nanozyme activity. As a result, a ratiometric electrochemical strategy for ALP analysis with a low limit of detection of 0.366 U/L (S/N = 3) was successfully achieved by integrating the above direct and indirect dual electrochemical responses. This developed bioassay can allow the quantitative diagnosis of ALP activity especially with a label-free and modification-free merit, therefore paving the way for simple, convenient, and portable electroanalytical tools in biosensing design and application. Graphical abstract
研究领域:
分析化学
·
生物化学
·
电化学
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纳米技术
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生物传感器
✓ 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）