SENSORS AND ACTUATORS B-CHEMICAL
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2023
·
IF 8.4
Rong Guo,Yongsheng Deng,Yinghao Jia,Caixin Shi,Wenpu Zhang,Ying Zhou,Xinghui Hou
In order to monitor the quality of the surrounding environment and realize the non-invasive screening of diabetes, it is necessary to develop a simple and sensitive acetone sensor. In this paper, GC x porous structures doped with different proportions of Ga element are prepared through calcining Co-MOF synthesized by solvothermal method . The findings indicate that the addition of Ga inhibits the further growth of grain and improves the uniformity of the adhered nanoparticles in GC x . Performance test shows that the GC4 sensor exhibit extremely ultra-high response (197.6, 50 ppm) acetone at 160 °C and relatively low detection limit of 0.1 ppm (2.3). The main reason for the significant improvement of GC x acetone sensitivity is that the introduction of Ga regulates the oxygen vacancy which provide rich reaction activation sites for the further reaction and diffusion of acetone and amplify resistance change by modulating the carrier concentration. A practical method for controlling oxygen vacancy and carrier concentration of sensing materials is shown in this work, which creates a new opportunity for the development of high-performance acetone sensors.
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高影响因子
MICROCHEMICAL JOURNAL
·
2023
·
IF 4.8
Jin Yang,Xin Shu,Shangying Qin,Li Huang,Shiqi Cheng,Yilin Wang
Co 3 O 4 nanoclusters (NCs) was prepared, and a novel method based on hydrogen peroxide (H 2 O 2 ) mediated fluorescence recovery of calcein-Co 3 O 4 NCs system for cholesterol detection was developed. The detection utilizes fluorescence quenching and recovery of calcein. In the absence of H 2 O 2 , the fluorescence of calcein is quenched by Co 2+ ions on the surface of Co 3 O 4 NCs. However, the fluorescence of calcein is restored in the presence of H 2 O 2 as a result of the oxidation of Co 2+ ions to Co 3+ ions. Further investigation indicates tha Co 3 O 4 t there is a correlation between H 2 O 2 concentration and fluorescence enhancement of calcein. Due to H 2 O 2 being one of the products of cholesterol catalytic oxidation, a novel cholesterol fluorescence measurement method has been established, which can achieve sensitive detection of cholesterol in the range of 1.0–50 μM, with a limit of detection (LOD) as low as 0.48 μM. More importantly, the feasibility of the method was verified in human serum total cholesterol determination with satisfactory results, indicating its potential application in real sample analysis.
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高影响因子
Nanoscale
·
2016
·Vol. 8
·期 11
·5938-5945
·
IF 7.76
Huimin Jia,Dongfang Yang,Xiangna Han,Junhui Cai,Haiying Liu,Weiwei He
Nanostructured enzyme mimics are of great interest as promising alternatives to artificial enzymes for biomedical and catalytic applications. Studying the chemical interactions between antioxidants and nano-enzymes may result in a better understanding of the antioxidant capability of antioxidants and may help improve the function of artificial enzymes to better mimic natural enzymes. In this study, using Co3O4 nanoparticles (NPs) as peroxidase mimics to catalyze the oxidation of chromophoric substrates by H2O2, we developed a platform that acts as a biosensor for hydrogen peroxide and glucose and that can study the inhibitory effects of natural antioxidants on peroxidase mimics. This method can be applied specifically to glucose detection in real samples. Three natural antioxidants, gallic acid (GA), tannic acid (TA), and ascorbic acid (AA), were compared for their antioxidant capabilities. We found that these three antioxidants efficiently inhibit peroxidase-like activity with concentration dependence. The antioxidants showed different efficiencies, in the following order: tannic acid > gallic acid > ascorbic acid. They also showed distinct modes of inhibition based on different interaction mechanisms. This study serves as a proof-of-concept that nano-enzyme mimics can be used to evaluate antioxidant capabilities and to screen enzyme inhibitors.
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PubMed
高影响因子
MICROCHEMICAL JOURNAL
·
2023
·
IF 4.8
Zhengfei Yang,Yueyue Zhong,Minghong Fan,Yongqi Yin,Huaiguo Xue,Weiming Fang
Developing electrochemical H 2 O 2 sensors with high sensitivity and selectivity is highly desirable in the food industry. Low-dimensional transition metal oxides are promising in electrochemical sensing due to their attractive characteristics. In this study, leaf-like zeolitic imidazolate framework (ZIF-L) and stick-like zeolitic imidazolate framework (ZIF-S) were used to prepare leaf-shaped L-Co 3 O 4 (L-Co 3 O 4 ) and stick-shaped Co 3 O 4 (S-Co 3 O 4 ). The low-dimensional structure could shorten the electron transmission paths and expose more active sites. A series of characterizations were carried out to investigate the morphology and composition of these two materials. Further, the L-Co 3 O 4 and S-Co 3 O 4 were investigated for electrochemical H 2 O 2 detection. The L-Co 3 O 4 showed good electrocatalytic activity toward H 2 O 2 in the ranges of 0.5–4500 and 4500–10000 μM with a detection limit of 0.47 μM. Moreover, the S-Co 3 O 4 had good H 2 O 2 detection performance in the ranges of 0.5–4500 and 4500–10000 μM with a detection limit of 0.33 μM. The constructed sensors also showed good anti-interference ability, reproducibility, stability, and applicability.
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高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2023
·
IF 5.2
Ping Niu,Chunhui Li,Chunyan Kong,Ning Zhang,Bingwei Xin,Fang Wang,Aili Wang,Dunqing Wang,Chunxiao Jia,Jingcheng Hao
Metal doping is a promising avenue to improve the catalytic property of Co-based catalysts for organic pollutants degradation via peroxymonosulfate (PMS) activation. Herein, alkaline earth metals doped mesoporous cobalt oxide catalysts (M/Co 3 O 4, M= Ca, Mg, Sr and Ba) were fabricated by combination of sol-gel method and cellulose template and employed to activate PMS for Ponceau 2 R (PR) decomposition. The doped alkaline earth metals induced strong promotion effects on the catalytic performance with the order of Ca > Mg > Sr > Ba. Notably, the rate constant of Ca/Co 3 O 4 (0.3048 min −1 ), which displayed the optimum catalytic performance, was 7.5 times that of pure Co 3 O 4 (0.0406 min −1 ) for PR degradation. Additionally, the influence of PMS and catalyst concentration, pH, doping amount, inorganic salts, and reaction temperature on PR degradation rate were investigated in detail. Ca/Co 3 O 4 manifested excellent catalytic activity after five successive runs without noticeable structure change. Electron paramagnetic resonance (EPR) and radicals scavenging experiments testified that O 2 ∙ - rather than • OH and SO 4 ∙ - was the dominating species for dye degradation . The reasonable catalytic mechanism was proposed.
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高影响因子
Nanomaterials
·
2023
·Vol. 13
·期 24
·3153
·
IF 5.3
Zhenteng Sheng,Hui Zhou,Yuhua Zhang,Jinlin Li,Li Wang
The selective hydrogenation of CO2into high-value chemicals is an effective approach to address environmental issues. Cobalt-based catalysts have significant potential in CO2hydrogenation reaction systems; however, there is a need to control their selectivity better. In this study, copper is introduced onto Co3O4nanosheets using the ion exchange reverse loading method. The unique interaction of these materials significantly alters the selectivity of the cobalt-based catalyst. Results from scanning transmission electron microscopy and scanning electron microscopy indicate that this catalyst enables a more even dispersion of copper species in the Co3O4nanosheets. Temperature-programmed reduction and X-ray photoelectron spectroscopy reveal that the catalyst facilitates the metal–metal interaction between Co and Cu. Temperature-programmed desorption experiments for CO2and H2demonstrate that the close interaction between Co and Cu modifies CO2adsorption, leading to differences in catalytic activity. Moreover, the catalyst effectively suppresses CO2methanation and promotes methanol formation by altering the alkalinity of the catalyst surface and weakening the hydrogen dissociation ability.Keywords:CO2hydrogenation;methanol;cobalt;copper
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PubMed
高影响因子
ChemistrySelect
·
2023
·Vol. 8
·期 18
·e202204645
·
IF 2.1
Yingzi Huang,Xue Ye,Xinhua Gao,Lisheng Guo,Yaqiong Wang,Wenlin Xu,Jie Li
Graphical A hollow microcage structured CoMn- x catalyst was synthesized by the template method. In which abundant CO 3+ as well as surface reactive oxygen species on the surface of the CoMn-2 catalyst enabled it to exhibit extremely high catalytic activity for CO under space velocity 36,000 mL g cat −1 h −1 , being able to completely eliminate CO at 80 °C and maintain stable catalytic activity for up to 100 h. Cost-effective and highly efficient catalyst is a promising way for the removal of CO in automotive exhaust purification. Herein, a series of novel self-assembled CoMn bimetallic catalysts with hollow microcage structure have been prepared through zeolitic imidazole framework (ZIF-67) assisted method followed by direct pyrolysis in static air. Both the Mn loading and the unique hollow microcage structure play important roles in CO low-temperature oxidation, and the highest catalytic activity is obtained for CoMn-2 catalyst, which presents T 100 (temperature of 100 % CO conversion) at 80 °C. Through a systematic series of experiments, we further demonstrate that our catalysts’ superior catalytic performance arises from small particle size, high surface active oxygen content and Co 3+ /(Co 2+ +Co 3+ ) ratio. Such configuration of catalysts will pave the way for new strategies to design noble-free high-performance catalysts for CO low-temperature oxidation.
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高影响因子
DIAMOND AND RELATED MATERIALS
·
2023
·
IF 4.1
Shiqi Zhang,Peidong Ling,Yi Chen,Jun Liu,Chun Yang
Herein, 2D/2D porous Co 3 O 4 nanosheets/rGO composites modified GCE (Co 3 O 4 /rGO/GCE) were proposed for electrochemical detection of tryptophan (Trp). The surface morphology and structure of Co 3 O 4 /rGO nanosheets were carried out using SEM, XRD , and Raman spectra . Electrochemical performance of Trp on as-synthesized modified electrodes were discussed by CV and EIS techniques. Moreover, the best electrochemical property was also investigated by varying test condition detailedly. Consequently, oxidation peak intensity and current density were 130.3 μA and 336.7 μA·cm −2 on Co 3 O 4 /rGO/GCE at working potential of 0.78 V ( vs. SCE electrode), respectively. They were more than 23-times greater than these on bare GCE in electrochemical detection of Trp. It was attributed to the synergy effect of 2D porous Co 3 O 4 nanosheets (high catalytic activity) and 2D rGO nanosheets (large electrochemical active area). After the optimization, wide linear determination ranges (from 1.0 to 800 μM) and low LOD of 0.26 μM (S/N = 3) were acquired. In addition, these electrodes were further successfully applied to the determination of Trp in commercial amino acid injection samples. This 2D porous Co 3 O 4 /rGO modified GCE sensor could provide a slight view on the design of 2D/2D composite materials with high electrochemical properties.
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高影响因子
APPLIED SURFACE SCIENCE
·
2023
·
IF 6.7
Shuo Li,Yahui Li,Juan Zhang,Xiutao Liu,Kaixin Zhang,Yu Zhang,Xi-ming Song
A CoOOH cocatalyst overlayer is electrochemically deposited on the BiVO 4 surface, and thermal annealing converted CoOOH to Co 3 O 4 in situ. The primary difference between the two cocatalysts lies in their electrolyte permeabilities, resulting in significant differences in their thermodynamic effects on enhancing the photoelectrochemical water oxidation performance. We proved that the CoOOH cocatalyst is unable to achieve true chemical passivation of the surface states of the BiVO 4 photoanode, whereas the Co 3 O 4 cocatalyst can chemically passivate the surface states. Nevertheless, the CoOOH cocatalyst still exhibits better water oxidation performance than Co 3 O 4 , which is attributed to the fact that the permeable CoOOH cocatalyst can accumulate more photogenerated holes in the bulk phase and provide more active sites. However, the CoOOH cocatalyst still exhibits better water oxidation performance compared to Co 3 O 4 , which is attributed to the permeable CoOOH cocatalyst can accumulate more photogenerated holes in its bulk phase and offer more active sites.
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高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2022
·
IF 9.136
Jing Yang,Heng-Quan Chen,Fen Qiao,Xifeng Zhu,Tao Wang,Wei-Ping Pan
Engineering metal-based nanoarchitectures and their atomic-scale arrangement is a promising avenue for enhanced mercury adsorbent activities. Interactions between metal single atoms and substrates result in regulated transitions between distinct reaction processes that boost mercury adsorption activity. Herein, a novel sorbent of porous Co 3 O 4 with Palladium atomic dispersed was successfully prepared by one-step pyrolysis of zeolitic imidazolate framework 67 (ZIF-67) precursors. Via engineering single Pd atoms into ZIF-derived Co 3 O 4 (Pd 1 /Co 3 O 4 -ZIF), the strong metal-support interaction (SMSI) activated the reducibility of Co 3+ in porous Co 3 O 4 to efficiently adsorb and oxidize Hg 0 , enhancing its mercury removal efficiency. Specifically, Pd 1 /Co 3 O 4 -ZIF exhibited superior sorption performance for Hg 0 over a broad range of temperatures (30–350 °C) and high gaseous hourly space velocity (about 555,500 hr −1 ) with the average Hg 0 removal efficiency higher than 98%. The strategy of constructing atomic active sites on the surface of porous metal-oxide to convert adsorbed Hg 0 into HgO is a promising approach to solve the problem that Hg 0 in flue gas is challenging to remove. Density functional theory (DFT) calculation further proved that the existence of a single Pd site on the surface of Co 3 O 4 significantly reduced the energy barrier of Hg 0 to HgO at the atomic level. This work contributed to a thorough comprehension of the structural and adsorption properties of the ZIF-derived Co 3 O 4 sorbent engineering with a single atom and enabled the efficient capture of elemental mercury in flue gas by such ZIF-derived sorbent.
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高影响因子
ADVANCED POWDER TECHNOLOGY
·
2019
·
IF 3.25
Weiwei Qiu,Hidekazu Tanaka,Feng Gao,Qingxiang Wang,Mingqiang Huang
Porous nanododecahedron of Co 3 O 4 /C has been synthesized by calcination of the ZIF-67 in air at 400 °C and then be used as electrode material for fabricating a highly sensitive and low overpotential sensor of nitrite ion (NO 2 − ). The structure and morphology characterization show that ZIF-67 behaves as an ideal sacrificial template for preparing Co 3 O 4 /C with regular shape. The two components of Co 3 O 4 and carbon are uniformly distributed in the composite. Electrochemical analysis shows that the excellent electrocatalysis performance toward the oxidation of NO 2 − is based on the synergy of Co 3 O 4 and carbon in the nanocomposite. At NO 2 − concentration from 2 nM to 8 mM, a fast response time within 3 s is revealed and 1.21 nM of detection limit is achieved. The sensor is also reliable to analysis of NO 2 − existed in the real samples of soil leaching liquid and macrophage supernate.
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高影响因子
ACS Applied Nano Materials
·
2019
·
IF 0
Panpan Wang,Ling Cao,Yu Chen,Ying Wu,Junwei Di
A novel kind of hydrogen peroxide (H2O2) photoelectrochemical (PEC) sensor was constructed based on Co3O4 and PbS nanomaterial modified indium tin oxide (ITO) photoelectrode. The Co3O4 nanoparticles, as mimic enzyme of catalase (CAT), can catalyze H2O2 to generate oxygen (O2) in suit. Then the electron acceptor of O2 enhances the cathodic photocurrent of the photoelectrode. The PEC sensor exhibited high sensitivity because of the formation of p–p type heterostructure between PbS and Co3O4 semiconductors. The photocurrent enhancement can be used to detect concentration of H2O2. The calibration plot was linear in the range from 5 to 250 μM, and the detection limit was estimated to be 1.2 μM. The results demonstrated the possibility of nanozyme application in PEC biosensors and the substitution of Co3O4 nanozyme for the natural enzyme.
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