SENSORS AND ACTUATORS B-CHEMICAL
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2017
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IF 5.401
Degong Ding,Qingzhong Xue,Wenbo Lu,Ya Xiong,Jianqiang Zhang,Xinglong Pan,Baoshou Tao
Here, we have newly developed chemically functionalized three-dimension (3D) graphene oxide hydrogels (FGH) decorated with metal-organic frameworks (MOFs)-derived Co 3 O 4 nanostructures, in which the Co 3 O 4 nanostructures are uniformly distributed in 3D FGH frameworks. It is found that the Co 3 O 4 /FGH composites exhibits excellent acetone sensing properties, for instance, it shows an ultra-high response (R gas /R 0 = 81.2) to 50 ppm acetone, which was ∼20 times higher than that of pristine Co 3 O 4 film, a short response time (∼20 s), and a distinct cross-selectivity against other interfering gases. Notably, upon exposure to 1 ppm acetone in air, the composites still can express an apparent response (R gas /R 0 = 4.06). The excellent acetone sensing properties of Co 3 O 4 /FGH can be mainly attributed to the unique porous structures of 3D FGH frameworks and the modulation of electrical transport properties of the Co 3 O 4 /FGH junctions in the composites. The Co 3 O 4 nanostructures uniformly distributed in 3D FGH frameworks can easily adsorb a great amount of acetone gas molecules through the unique porous frameworks and produce a great deal of electrons, which can be transferred to the p-type FGH frameworks through Co 3 O 4 /FGH junctions so that the resistance of Co 3 O 4 /FGH composites is greatly increased. Therefore, the acetone response of the composites is dramatically enhanced because of the Co 3 O 4 /FGH junctions. This study presents a new idea of building MOF-derived oxides/FGH junctions to enhance gas response of oxide-based gas sensors, and has great potential in fabrication of new generation gas sensors.
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高影响因子
ELECTROCHIMICA ACTA
·
2017
·
IF 4.798
Zhiyong Gao,Chen Chen,Jiuli Chang,Liming Chen,Dapeng Wu,Fang Xu,Kai Jiang
The enhancement of energy density at high power density is highly desired in design of supercapacitor , which relies on the electrochemically accessible electrode area, electrons/ions diffusion channels of electrodes and the device assembly manner. Herein, graphitized and porous fullerene carbon soot is used as matrix for preparation of activated carbon (denoted as a-FC). The high specific surface area, hierarchical pore sizes and moderate graphitization degree of a-FC enable balanced specific capacitance, rate capability and cycleability. Meanwhile, graphene-Co 3 O 4 composite (GC) with cross-linked porous Co 3 O 4 nanofibers array onto graphene sheet is hydrothermally deposited on Ni foam substrate. The pseudocapacitive GC electrode can offer superior capacitance (1935 F g −1 at 5 A g −1 ), rate capability (68% capacitance retaining ratio within 0.5–50 A g −1 ) and considerable cycleability (17% capacitance decline within 2000 charge-discharge cycles) comprehensively. Furthermore, the asymmetric supercapacitor based on the a-FC and GC electrodes delivers balanced energy density (50.3–20.9 Wh kg −1 ), power density (786–12128 W kg −1 ) and cycleability (77% initial capacitance maintaining ratio within 5000 charge-discharge cycles), highlighting the potential in efficient energy storage device.
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Materials Chemistry Frontiers
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2017
·Vol. 2
·期 2
·323-330
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IF 0
Chaojie Lyu,Jinlong Zheng,Rui Zhang,Ruqiang Zou,Bin Liu,Wei Zhou
As a widely used antimicrobial agent in toothpastes and body washes for decades, triclosan (TCS) is causing great harm to the environment through wastewater. Herein, we used a two-electrode system to remove TCS comprising Co3O4 nanowires/carbon cloth (Co3O4 NWs/CC) as anode and CoP nanowires/carbon cloth (CoP NWs/CC) as cathode. At a constant current density of 10 mA cm−2, the degradation efficiency for TCS is 95% in 60 min and it is transformed into important chemical raw materials, including phenol, 1,2-dihydroxybenzene, and 2-phenoxyphenol. Subsequently, hydrogen is generated on the CoP NWs/CC cathode with Faradaic efficiency of nearly 100%. The synergetic effect of the superhydrophilic surfaces of the Co3O4 NWs/CC anode and the CoP NWs/CC cathode as well as the superaerophobicity of the cathode assures full contact of the electrolyte solution and the active materials and high-efficiency generation of H2 bubbles.
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Journal of Energy Chemistry
·
2024
·
IF 14
Xuena Ma,Zhangxin Xu,Mingyang Liu,Panzhe Qiao,Qi Li,Ruihong Wang,Baojiang Jiang
Electronic-state modulation strategy offers great potential in designing RuO 2 -based bifunctional-electrocatalysts for rechargeable Zn-air batteries (ZABs). Various three-dimensional (3D) transition metal oxides are attempted to couple with RuO 2 for constructing an appropriate Ru O M interface. This work aims to construct Co 3 O 4 -RuO 2 heterostructures on carbon sheets (Co 3 O 4 /RuO 2 /NCNS) for boosting electronic transfer and regulation. Experiments and theoretical calculations identify the electronic transfer from Co 3 O 4 to RuO 2 that modulates the electronic structure of metal surfaces/interfaces. Specifically, it leads to the increase in Co 3+ content, electron-rich state at RuO 2 surface and electronic accumulation at interfaces. Moreover, this electronic-state modulation optimizes the d-band center in Co 3 O 4 /RuO 2 that lowers the reaction barriers and endows interfaces as the biggest contributor to oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) performance. The Co 3 O 4 /RuO 2 /NCNS shows a quite low potential difference of 0.62 V and remarkable durability for ORR/OER. Co 3 O 4 /RuO 2 /NCNS-assembled ZABs exhibit an excellent specific capacity of 818.3 mA h g −1 and a superior lifespan over 750 h.
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高影响因子
APPLIED SURFACE SCIENCE
·
2024
·
IF 6.3
Jianqiang Ye,Buming Chen,Jun Guo,Hui Huang,Yapeng He,Shixing Wang
High oxygen evolution overpotential and low corrosion resistance are regarded as the main drawbacks of anode materials in zinc electrowinning . To improve the electrocatalytic activity of oxygen evolution reactions (OER) and reduce energy consumption in zinc electrowinning, a Co 3 O 4 nanoparticle-modified PbO 2 anode was prepared on a Ti substrate with Sn-SbO X as an interlayer through pulse electrodeposition . The surface morphology, phase composition, and electrochemical properties of the as-prepared anode were systematically investigated. The introduction of Co 3 O 4 nanoparticles refined the crystal size of PbO 2 and increased the surface roughness of the anode. Electrochemical tests suggested the excellent electrocatalytic activity of the Co 3 O 4 nanoparticle-modified PbO 2 anode. Density functional theory (DFT) calculations revealed that Co 3 O 4 nanoparticles reduced the OER free energy (1.58 eV) and that pulse electrodeposition reduced the PbO 2 crystal size and increased the active surface area of the anode. In the simulated zinc electrowinning test, an improved current efficiency (90.6 %) was achieved, and the low energy consumption (2,508.29 kW·h) for zinc production per ton was significantly reduced as compared with that for the conventional Pb-0.75 %Ag anode. The lifetime of the modified electrode is increased by approximately 36.8 %. This provides a reference for the design and development of anode materials with high oxygen evolution activity and strong corrosion resistance in zinc electrowinning systems.
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SENSORS AND ACTUATORS B-CHEMICAL
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2024
·
IF 8
Bing Song,Lixue Qi,Hongyi Wu,Yan Tong,Li Li,Muhammad Ikram,Keying Shi
The solvothermal and wet chemical method was developed to synthesized the p-n heterostructures of the thin porous Co 3 O 4 nanosheets with ZnO nanoparticles. The resulting products were analyzed by using various characterization techniques. The results possessed that the presence of a large number of oxygen defects on the surface of Co 3 O 4 -ZnO-7 favors enhancing the NO 2 adsorption. Correspondingly, the formation of p-n heterojunction and the large surface area of the material itself increased the carrier density and exposed more active sites, which collectively boost the sensing performance to NO 2 . The sensor showed a high response of 45.7 (S = R a /R g ) to 100 ppm NO 2 at room temperature (RT = 25 °C), with a short response/recovery time (1.3/25 s), and the lower detection limit of the sensor reached 30 ppb, with good selectivity, reproducibility and stability. This study will offer the opportunity to develop new sensors with high response and fast response-recovery to NO 2 at room temperature.
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CHEMICAL ENGINEERING JOURNAL
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2024
·
IF 13.3
Feng Chen,Xuebin Lin,Wei Chen,Na Wen,Yanqiao Jin
The design of a highly active Cu-Co catalyst for catalytic transfer hydrogenolysis of lignin without the use of external hydrogen remains highly challenging. In this work, Cu 2 O was initially encapsulated in ZIF-67, and subsequently Cu 2 O@ZIF-67 was utilized as a precursor and sacrificial template to prepare the unique double core–shell hollow nanocage CuO@Co 3 O 4 . Co and Cu, serving as Lewis acid sites and dehydrogenation sites for the hydrogen-donor solvent isopropanol, respectively, exhibited synergistic enhancement, further increasing the catalytic activity. Under the optimal conditions of 220 °C, 1 MPa N 2 , and 4 h, the catalyst achieved 100 % conversion of 2-phenoxy-1-phenylethanol and 100 % yield towards cyclohexanol and ethylbenzene. Furthermore, the catalyst remained stable and reusable after 5 cycles, providing a practicable guidance for the value-added conversion of lignin.
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APPLIED SURFACE SCIENCE
·
2024
·
IF 6.3
Songlin Li,Min Zhang,Zhaohui Lei,Jie Gao,Pengfei Cheng,Hai Wang
Water vapor causes the baseline resistance, response, recovery time, and long-term stability of the metal oxide semiconductor (MOS) gas sensors to change in different humidity. Combining first-principle and experimental can provide an in-depth understanding of the sensing mechanism from the atomic and molecular scales. In this work, we examined the humidity sensitivity of different concentrations of Ni-doped Co 3 O 4 in detail. Co 48 O 64 (1 1 0) and Co 48 O 64 (1 1 1) were constructed by HR-TEM and doped with single, double, and treble Ni atoms on both surfaces. We calculated the adsorption of water and n-butanol molecule on these eight surfaces. The results show that Ni doping improves the moisture resistance properties of Co 48 O 64 (1 1 0) and Co 48 O 64 (1 1 1), and the sensing properties of C 3 H 9 OH adsorbed on Ni 2 Co 46 O 64 (1 1 0) and Ni 2 Co 46 O 64 (1 1 1) are higher than single and treble Ni atoms doping. To investigate the humidity sensitivity further, we synthesized nanorods Co 3 O 4 with and without Ni doping. The experimental results showed that the humidity sensitivity of Ni-Co 3 O 4 was significantly lower than that of Co 3 O 4 . The decrease in the response value for the C 3 H 9 OH may be attributed to the change in the concentration of the Ni doping or the difference in the primarily exposed crystal facet.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2024
·
IF 9.4
Yu-Lin Zhong,Xu Zhang,Ai-Jun Wang,Pei Song,Tiejun Zhao,Jiu-Ju Feng
Reactive oxygen species (ROS)-centered chemodynamic therapy (CDT) holds significant potential for tumor-specific treatment. However, insufficient endogenous H 2 O 2 and extra glutathione within tumor microenvironment (TME) severely deteriorate the CDT's effectiveness. Herein, rich-Zn-Co 3 O 4 / N -doped porous carbon (Zn-Co 3 O 4 /NC) was fabricated by two-step pyrolysis, and applied to build high-efficiency nano-platform for synergistic cancer therapy upon combination with glucose oxidase (GOx), labeled Zn-Co 3 O 4 /NC-GOx for clarity. Specifically, the multiple enzyme-like activities of the Zn-Co 3 O 4 /NC were scrutinously investigated, including peroxidase-like activity to convert H 2 O 2 to O 2 ∙− , catalase-like activity to decompose H 2 O 2 into O 2 , and oxidase-like activity to transform O 2 to O 2 ∙− , which achieved the CDT through the catalytic cascade reaction. Simultaneously, GOx reacted with intracellular glucose to produce gluconic acid and H 2 O 2 , realizing starvation therapy. In the acidic TME, the Zn-Co 3 O 4 /NC-GOx rapidly caused intracellular Zn 2+ pool overload and disrupted cellular homeostasis for ion-intervention therapy. Additionally, the Zn-Co 3 O 4 /NC exhibited glutathione peroxidase-like activity, which consumed glutathione in tumor cells and reduced the ROS consumption for ferroptosis. The tumor treatments offer some constructive insights into the nanozyme-mediated catalytic medicine, coupled by avoiding the TME limitations.
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PubMed
高影响因子
PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
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2024
·
IF 6.9
Liusha Cen,Fan Yu,Shixue Liu,Chengcai Li,Wangyong Jin,Chenliang Wang,Hailin Zhu,Yuhai Guo
The technology that catalyst activated perxymosulfate (PMS) has been widely used in the decomposition of organic pollutants. We prepared Zn and Co-based ZIF and obtained C-doping Co 3 O 4 / ZnO heterojunction after pyrolysis. C-doping Co 3 O 4 / ZnO heterojunction with cage core-shell structure was loaded on the polyvinylidene fluoride (PVDF) membranes with a layered porous structure by solvent-assisted nanoparticle embedding (SANE) method, where the carmine degradation reached 99.6 % by MC-430 activated Perxymosulfate (PMS) within 10 min. The influencing factors (such as the pyrolysis temperature, PMS dosage, and dye concentration) on OFX degradation were observed, and MC-430 exhibited good tolerance for these factors and a wide range of solution hydrogen ion concentrations (pH= 4–10). The strong reusability and stability analysis showed that the carmine degradation of the MC-430/PMS system changed minorly (from 99.6 % to 97.7 %) in 5 consecutive cycles without any treatment. The degradation mechanism was confirmed by capture experiments, in which the non-free radical path was the main one and the free radical path was the auxiliary one. Moreover, structure characterizations and density functional theory calculations verified that doped C sites provided a channel for electron transfer from Zn sites to Co sites, which increased the generation rate of reactive oxygen species (ROS) and prolonged the catalyst life. This work provides a new method for the preparation of nonmetallic doping bimetallic strong coupling catalysis.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2025
·
IF 9.7
Zhe Guan,Lili Bo,Jiayao Zhu,Zhijie Feng,Qizhao Wang,Yupeng Li,Jianmin Gou,Xiaolu Yang,Fang Nian,Jinhui Tong
The development of efficient bifunctional electrocatalysts for overall water splitting is crucial for sustainable hydrogen production. In this work, we introduce a novel CoP/Co 3 O 4 /N-doped carbon nanofiber (CoP/Co 3 O 4 /N-CNFs) catalyst, synthesized through a combination of electrospinning, carbonization, oxidation, and phosphorization. The resulting heterostructure exhibits outstanding bifunctional electrocatalytic activity for both hydrogen evolution reaction (HER) and oxygen evolution reaction (OER). The key innovations include the interface effect and synergistic interactions between CoP and Co 3 O 4 , enhanced by nitrogen doping and abundant oxygen vacancies, which significantly improve the catalyst's intrinsic activity, electrochemical surface area, stability, and near-unity Faraday efficiency. In situ structural evolution during electrolysis leads to the formation of active Co(OH) 2 and CoOOH species, further enhancing catalytic performance. The optimal CoP/Co 3 O 4 /N-CNFs-370-1:40 catalyst demonstrates exceptional HER and OER performances, requiring overpotentials of just 79 mV and 287 mV at 10 mA·cm −2 respectively, which is superior to many analogous non-noble electrocatalysts reported. Density functional theory (DFT) calculations reveal that the CoP/Co 3 O 4 heterojunction facilitates efficient charge transfer and optimizes the adsorption of reaction intermediates by modulating the d-band center, which accounts for the superior catalytic activity. This work offers a promising strategy for designing efficient non-precious bifunctional electrocatalysts for water splitting.
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PubMed
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2022
·
IF 9.136
Huixian Zhou,Hui Zhong,Yiqing Zeng,Yutang Kang,Bin Chen,Shuanglu Ma,Yifan Li,Yu Zhang,Shasha Feng,Zhaoxiang Zhong,Weihong Xing
The strategy of constructing catalytic membrane has a significant influence on its structure and performance. In this work, Co 3 O 4 -C x @SiO 2 nanofiber membranes (NFMs) were fabricated by an in-situ growth–pyrolysis–oxidation strategy. The Co 3 O 4 -C x catalyst derived from ZIF-67 was wrapped around nanofibers, which helps to maintain a stable membrane structure, then suppressing the reduction of gas permeability. Among the Co 3 O 4 -C x catalyst, the carbon skeleton can prevent the agglomeration of Co 3 O 4 nanoparticles, obtaining an ultra-fine Co 3 O 4 nanoparticles with high dispersibility, redox property and surface area. The obtained Co 3 O 4 -C 300 @SiO 2 NFM exhibits outstanding ammonia selective catalytic reduction (NH 3 -SCR) denitrification activity (T 90 = 225 °C at a GHSV of 77,000 h −1 ). The effect of catalyst loading on PM 2.5 filtration performance of SiO 2 NFM was also tested. Co 3 O 4 -C 300 @SiO 2 NFM has higher filtration efficiency (99.99%) than SiO 2 NFM at a lower pressure drop of 58 Pa, which suggests that catalyst loading via our method can improve the filtration performance of SiO 2 NFM. This work might provide a universal strategy for the design and preparation of highly efficient catalytic membrane.
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