INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
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2022
·Vol. 23
·期 7
·3799
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IF 6.208
Lulu Xiong,Yuanyuan Zhang,Shiming Wu,Feng Chen,Lingli Lei,Ling Yu,Changming Li
A facile and ingenious method to chemical etching-coordinating a metal-organic framework (MOF) followed by an annealing treatment was proposed to prepare Co3O4nanoparticles uniformly dispersed in rational porous carbon nano-boxes (Co3O4@CNBs), which was further used to detect H2O2released from living cells. The Co3O4@CNBs H2O2sensor delivers much higher sensitivity than non-etching/coordinating Co3O4, offering a limit of detection of 2.32 nM. The wide working range covers 10 nM-359 μM H2O2, while possessing good selectivity and excellent reproducibility. Moreover, this biosensor was used to successfully real-time detect H2O2released from living cells, including both healthy and tumor cells. The excellent performance holds great promise for Co3O4@CNBs’s applications in electrochemical biomimetic sensing, particularly real-time monitor H2O2released from living cells.Keywords:nano-boxes;tannic acid;Co3O4@CNBs;hydrogen peroxide sensor;electrochemical detection;living cell
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高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2022
·
IF 9.221
Haiyan Zhao,Linna Dou,Jujie Ren,Min Cui,Na Li,Xueping Ji,Xiaoting Liu,Cong Zhang
Adenosine triphosphate (ATP), as the primary energy source and significant biomarker, is associated with the occurrence and progression of various diseases. Therefore, detecting ATP sensitively is essential for ATP-related biochemical study, disease diagnosis and treatment. Herein, sensitive electrochemical aptasensing of ATP was proposed based on MOF-derived porous Co 3 O 4 coupled with AuNPs and nucleic acids as a novel electrocatalysis signal probe . Firstly, [email protected] 3 O 4 nanocomposite was synthesized via pyrolysis Co-zeolitic imidazolate framework and then functionalized with AuNPs by in situ chemical reduction, which showed excellent electrocatalytic activity towards hydroquinone (HQ) as well as excellent stability. Then, DNA capture probe (CP) was connected to [email protected] 3 O 4 nanocomposite via Au-S bond to form [email protected] 3 O 4 -CP signal probe for signal transduction . Meanwhile, well-designed aptamer probe (AP) containing ATP aptamer and its complementary sequence was immobilized on AuNPs modified electrode surface via Au-S bond. In the presence of ATP, the aptamer in AP interacted with ATP, resulting in the dissociation of AP. Consequently, [email protected] 3 O 4 -CP signal probe could be captured on electrode surface via hybridization, leading to a significant amplified electrocatalytic signal towards HQ. Finally, the quantitative determination of ATP was achieved by determining the current signal generated on electrode surface. The proposed electrochemical aptasensor demonstrated excellent sensitivity and selectivity that could detect ATP as low as 0.3 nM. Moreover, the aptasensor showed excellent performance for detecting ATP in complex serum matrix. These results indicate that MOF-derived nanocomposites have promising application in construction of novel electrocatalysis signal probe as well as versatile bioassays.
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CHEMICAL ENGINEERING SCIENCE
·
2021
·
IF 4.311
Shao-Bo Cao,Lin-Yu Zhou,Guolei Xiang,Guang-Wen Chu,Liang-Liang Zhang,Jian-Feng Chen
Sub-10 nm Co 3 O 4 nanoparticles with a narrow size distribution are prepared by a surfactant-free liquid precipitation method in a rotating packed bed (RPB) reactor. The mean size of the material is about 8.5 nm, and is the smallest among previous reports via surfactant-free liquid precipitation. The growth mechanisms show that the sizes of Co 3 O 4 nanoparticles inherit from the precursory Co(OH) 2 . Compared to the traditional stirred tank reactor, RPB can enhance the nucleation of Co(OH) 2 through enhanced micro-mixing, which leads to thinner and more uniform products. As-prepared Co 3 O 4 can show enhanced catalytic performance for ammonium perchlorate (AP) decomposition. The peak temperatures of AP decomposition reduce to 296.8 °C, 291.8 °C, 290.0 °C, and 286.6 °C by adding 2 wt% 22.6 nm, 15.0 nm, 10.9 nm, and 8.5 nm of Co 3 O 4 nanoparticles, respectively. Density functional theory (DFT) calculations and thermogravimetry coupled with mass spectrometry (TG-MS) analysis reveal that the size-dependent catalytic activity of Co 3 O 4 for AP decomposition origin from varied O 2 activation ability and NH 3 adsorption capacity at the edge and corner sites.
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ANALYTICA CHIMICA ACTA
·
2021
·
IF 6.558
Yiwei Liu,Xiaopeng Hu,Yide Xia,Faqiong Zhao,Baizhao Zeng
In this work, a novel signal on/off ratiometric electrochemical sensor for the selective detection of chlorpromazine (CPZ) was developed. The sensor was constructed by electrodepositing dual-monomer molecularly imprinted polymer (DMMIP) film on the surface of Pt/Co 3 O 4 nanoparticles modified glassy carbon electrode, using CPZ as template molecule, methylene blue and catechol as functional monomers. The copolymerization of two monomers increased the diversity of functional groups for binding template molecules, and enhanced stability. The quantitative detection of CPZ was performed by differential pulse voltammetry, using the peak current of poly (methylene blue) as reference signal and the peak current of CPZ as indicating signal. The results showed that the developed DMMIP sensor not only possessed high selectivity and sensitivity, but also exhibited satisfactory anti-interference ability. Under the optimum conditions, a linear detection range of 0.005–9 μmol L −1 (R 2 = 0.9962) was obtained, and the limit of detection was 2.6 nmol L −1 . Moreover, the sensor showed good reproducibility and stability toward CPZ detection. It was applied to detect CPZ in serum and pharmaceutical samples, and satisfactory recoveries (ranging from 95.3% to 108.0%) were achieved.
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高影响因子
Small
·
2021
·Vol. 17
·期 43
·2101393
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IF 13.281
Shiyin Zhao,Yangke Long,Yiping Su,Shubin Wang,Zuotai Zhang,Xuanjun Zhang
Antibiotics discharge has been a critical issue as the abuse in clinical disease treatment and aquaculture industry. Advanced oxidation process (AOPs) is regarded as a promising approach to degrade organic pollutants from wastewater, however, the catalysts for AOPs always present low activities, and uncontrollable porosities, thus hindering their further wider applications. In this work, an aliovalent-substitution strategy is employed in metal-organic framework (MOF) precursors assembly, aiming to introduce Co(II/III) into Ce-O clusters which could modify the structure of the clusters, then change the crystallization, enlarge the surface area, and regulate the morphology. The introduction of Co(II/III) also enlarges the pore size for mass transfer and enriches the active sites for the production of sulfate radicals (SO 4 • − ) in MOF-derived catalysts, leading to excellent performance in antibiotics removal. Significantly, the CeO 2 •Co 3 O 4 nanoflowers could efficiently enhance the generation of sulfate radical SO 4 • − and promote the norfloxacin removal efficiency to 99% within 20 min. The CeO 2 •Co 3 O 4 nanoflowers also present remarkable universality toward various antibiotics and organic pollutants. The aliovalent-substitution strategy is anticipated to find wide use in the exploration of high-performance MOF-derived catalysts for various applications.
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高影响因子
HYDROMETALLURGY
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2020
·
IF 3.338
Xuanbing Wang,Ruidong Xu,Suyang Feng,Chen Chen,Buming Chen
In this paper, a Co 3 O 4 - and CNT-doped 3D PbO 2 electrode was fabricated through galvanostatic electrodeposition in a Pb(Ac) 2 -NH 2 SO 3 H solution, and the electrochemical properties were systematically investigated in a zinc electrolyte. The XRD results show that the deposit is a mixture of an α + β phase (a dominant β-PbO 2 phase with a minor α-PbO 2 phase present), and the SEM images show that Co 3 O 4 and CNT have been simultaneously deposited with PbO 2 . The 3D-Ti/PbO 2 -(4 g·L −1 ) Co 3 O 4 -(0.4 g·L −1 ) CNT electrode exhibits a voltammetric charge 5 times larger than that of the 3D-Ti/PbO 2 electrode, which indicates outstanding electrocatalytic activity. The oxygen evolution reaction overpotential and cell voltage are only 394 mV and 3.74 V at 500 A∙m −2 , respectively. In addition, the obtained electrode showed a high current efficiency of 95.3% and a service life of 26 h under a current density of 20,000 A∙m −2 . Hence, this study offers a facial synthesis route to prepare composite electrodes for zinc electrowinning and provides deep insight into the relationship among doping substances, microstructures and electrocatalytic activity.
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Materials Today Energy
·
2020
·
IF 5.604
Xingkun Wang,Huiyu Gai,Zongkun Chen,Yanhui Liu,Jingjing Zhang,Bolin Zhao,Arafat Toghan,Minghua Huang
The design of non-precious metal-N-C (M-N-C) materials with efficient oxygen reduction activity are extremely necessary for renewable energy technologies. These M-N-C electrocatalysts are often composed of metal nanoparticles and M-N x sites simultaneously due to their structural heterogeneity induced by the high-temperature strategy. However, these metal nanoparticles usually suffer from a partial electrochemical/chemical oxidation or dissolution in strong alkaline electrolytes , which may decrease the number of active sites for electrocatalytic oxygen reduction reaction (ORR). Herein, we demonstrated a facile strategy to get this obstacle that fabricate the core-shell crystalline/amorphous Co/Co 3 O 4 heterostructures incorporated in N-doped hollow carbon spheres (Co/Co 3 O 4 @NHCS). Specifically, the amorphous Co 3 O 4 shell could effectively prevent the electrochemical oxidation/dissolution of metal Co core in strong alkaline solution. It could also create abundant interface that provide sufficient electron supply and reaction places, and thus make it promising the high efficiency of electron transfer . Furthermore, the N-doped defective graphitic carbon could optimize and facilitate the charge/mass transport that could maximize the catalytic activity. Deliberately coupling the crystalline/amorphous Co/Co 3 O 4 heterostructures with Co-N x sites are advantageous to achieve the remarkable catalytic activity and superior durability for ORR in alkaline media. As expected, the resulted Co/Co 3 O 4 @NHCS catalysts possess the superior ORR activity with a half-wave potential of 0.82V (vs. RHE), similar to that of the commercial Pt/C. Most importantly, it shows excellent durability with almost negligible loss in catalytic performance after 3500 cycles. This work opens an avenue for rational design the efficient ORR electrocatalysts toward practical applications in fuel cells.
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ELECTROCHIMICA ACTA
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2020
·
IF 6.215
Chun-Yang Li,Yuan-Yuan Wei,Wei Shen,Xuan Dong,Meng Yang,Juan Wei
The construction of ultrahighly sensitive electrochemical sensing interfaces is essential for the accurate determination of trace-level arsenic(III) (As(III)) due to its severe toxicity. In this report, an ultrahighly sensitive electrochemical sensor was constructed for the electroanalysis of As(III) by the uniform assembly of gold nanoparticles on porous cobaltosic oxide (Co 3 O 4 ) microsheets (AuNPs/Co 3 O 4 nanocomposites). The developed sensor-modified screen-printed carbon electrode (SPCE) detected As(III) by using square wave anodic stripping voltammetry (SWASV) with an ultrahigh sensitivity of 12.1 ± 0.2 µA ppb −1 and a low limit of detection (LOD) of 0.09 ppb (S/ N = 3). The strong electrochemical performance is attributed to the high adsorption capacity of porous Co 3 O 4 microsheets and the favorable electrocatalysis of in situ AuNPs toward As(III) reduction. In addition, the proposed method demonstrates satisfactory anti-interference performance in the presence of other metal ions (Cu(II), Pb(II), Cd(II), Zn(II), Hg(II), Ca(II), Fe(III), Mg(II), Mn(II), and Ni(II)). Robust stability and reproducibility were also realized. Most importantly, the electrochemical sensor was successfully applied to the electroanalysis of As(III) in water and human serum samples. The results of this study provide new insights into the design of sensitive and stable electrochemical sensing interfaces for the accurate analysis of trace levels of As(III) in practical applications.
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APPLIED SURFACE SCIENCE
·
2020
·
IF 6.182
Lin Gong,Xiaodong Li,Qi Zhang,Bing Huang,Qiang Yang,Guangcheng Yang,Yousong Liu
Transition metal quantum dots (QDs) are ideal electrocatalysts due to their short ion diffusion path, high atom utilization and effective electron transfer properties. However, a lack of facile and large-scale synthesis strategy limits their industrial production and commercial application. In this study, a triaminoguanidine salt-induced one-step deflagration method is first reported for the ultrafast (hundreds of milliseconds) and gram-scale synthesis of Co 3 O 4 QDs-C 3 N 4 /rGO as an efficient oxygen reduction reaction (ORR) catalyst with high durability. The deflagration reaction process is carefully studied and the formation mechanism is proposed to explain the controllable synthesis of Co 3 O 4 QDs. An optimized sample is capable of achieving an excellent ORR performance in terms of an onset potential of 0.97 V (vs. RHE, equivalent to Pt/C) and the limited current density of −5.33 mA·cm −2 at 0.35 V (vs. RHE, ~7% higher than that of Pt/C). It is believed that this simple and effective synthesis strategy will open up an exciting new avenue to the future design and facile synthesis of Co 3 O 4 or other QDs-based functional materials.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2021
·
IF 5.816
Jianxun Zhao,Jian Lv,Dayong Liu,Wanqiang Liu,Heng Liu,Peng Chen,Xinwei Wang,Yong Cheng,Xin Guo
Co 2 B alloy was synthesized via the method of high temperature solid phase. Carbon fiber (CF) was prepared from cotton by calcination process. The addition of carbon fiber and Co 3 O 4 improves corrosion resistance and charge transfer speed of the composite material electrode . The R ct value of Co 2 B + 1 wt.% CF was 360 mΩ, lower than the other composite electrode could reduce charge transfer resistance . The overall electrochemical performance of Co 2 B + 2 wt.% Co 3 O 4 + 1 wt.% CF was best among all the electrodes, and its C max could reach 715.3 mAh/g. The high conductivity and multiple reaction sites provided by carbon fiber and the catalytic effect of Co 3 O 4 may be the main reasons for the improvement of electrochemical performance, which enhance the kinetic performance of electrochemical reactions . The synergistic effect of carbon fiber and Co 3 O 4 improves the electrochemical hydrogen storage properties of Co 2 B alloy. This work presents a simple and effective method to improve the electrochemical hydrogen storage performance of cobalt-boron alloys by adding transition metal oxides and carbon materials derived from biomass.
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CHEMICAL ENGINEERING JOURNAL
·
2019
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IF 8.355
Zhilin Li,Min Wang,Chongyue Jin,Jin Kang,Jun Liu,Hairong Yang,Yueqiu Zhang,Qianyun Pu,Yu Zhao,Meiyan You,Zengmin Wu
To further enhance the peroxymonosulfate (PMS) activation performance, novel Co 3 O 4 hierarchical porous nanosheets composed of 5–10-nm ultrafine nanoparticles (Co 3 O 4 -MC) are successfully fabricated by calcining corn straw (CS) biotemplates coated with a metal–organic framework (MOF)–Co precursor. In view of the combined advantages that MOF-Co derivation and biotemplates afford, the resulting Co 3 O 4 -MC catalysts have a large specific surface area (64.42 m 2 /g) with the cobalt active sites distributed over entire catalysts nanosheets. These catalysts exhibited excellent PMS activation activity toward oxytetracycline (OTC) degradation with a 100% removal rate in 12 min. Additionally, Co 3 O 4 -MC is found to be highly stable with a minor Co leaching of 11 μg/L. Quenching tests and electron paramagnetic resonance (EPR) measurements indicated that radical and nonradical PMS activation mechanisms coexisted in the Co 3 O 4 -MC/PMS system. The pathway of OTC degradation is investigated based on the OTC intermediates whose presence is confirmed by gas chromatography-mass spectroscopy (GC–MS). It is also found that the toxicity of the degraded OTC toward zebrafish is lower than that of the initial OTC. This study provides a prospective strategy for developing highly effective metal oxide toward PMS activation for the rapid removal of stubborn organic pollutants in water.
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CHEMICAL ENGINEERING JOURNAL
·
2018
·
IF 6.735
Liwei Chen,Xu Zuo,Shengjiong Yang,Tianming Cai,Dahu Ding
Rational design and synthesis of efficient catalyst for the generation of sulfate radicals (SO 4 − ) through heterogeneous approach is highly desirable. In the present study, a magnetic cobalt-based catalyst, Co 3 O 4 @Fe 2 O 3 was successfully synthesized by using metal-organic frameworks (MOFs) as a template. A hollow core-shell structure possessing moderate specific surface area (22.8 m 2 g −1 ) and pore volume (0.18 cm 3 g −1 ) was obtained. The catalyst performed high efficiency for the degradation of norfloxacin (NOR) by coupling with peroxymonosulfate (PMS). And the process was kinetically favorable in neutral (0.43 min −1 at pH of 7.5) and weak acidic/basic conditions, whilst significantly inhibited at acidic condition (0.12 min −1 at pH of 4.5). Catalyst loading showed a more remarkable effect on the degradation process than PMS dose. Interestingly, chloride, phosphate and bicarbonate ions clearly promoted the degradation process while humic acid showed a detrimental effect. Cl 2 /HOCl oxidation system was demonstrated when massive Cl − was added into the reaction system. As evidenced by electron paramagnetic resonance (EPR) analysis, both hydroxyl and sulfate radicals contributed to the degradation and the latter one played a crucial role. Eventually, degradation pathway was tentatively proposed based on the HPLC-ESI-MS/MS analysis of the detected intermediates. This study would be very meaningful to promote the applications of sulfate radical based advanced oxidation processes (SR-AOPs) for the environmental remediation.
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