Journal of Materials Chemistry A
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2018
·Vol. 6
·期 8
·3730-3737
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IF 9.931
Tongtong Li,Yongxin Lu,Shuaishuai Zhao,Zhi-Da Gao,Yan-Yan Song
The development of catalysts based on non-precious metals that are able to catalyze both the oxygen reduction and oxygen evolution reactions (ORR/OER) is the key element to promote the practical application of rechargeable metal–air batteries. Here we report a novel concept that layered double hydroxides (LDHs) can be used as a precursor to form bimetals and their oxides simultaneously. Co3O4-doped Co/CoFe nanoparticles integrated with graphitic shells are derived from the thermal decomposition of a CoFe LDH bonded with urea as the carbon precursor. The composite material shows a surprisingly high bifunctional (ORR/OER) catalytic activity. The realized core–shell structure synergistically promotes the ORR performance while cobalt oxide doped on the metal surface boosts the OER performance. In addition, the carbon shell ensures high electrical conductivity and effectively impedes the aggregation and the further oxidation of Co/CoFe nanoparticles. When integrating the catalyst into a rechargeable Zn–air battery, the battery performance shows a higher discharge potential and cycling stability (over 65 h of cycling) and a lower charge plateau compared with a Zn–air battery based on a Pt/C and RuO2 catalyst mixture. This work demonstrates a new efficient air cathode material which could be practically applied to rechargeable metal–air batteries or other fuel cells.
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DESALINATION
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2024
·
IF 8.3
Xu Yin,Renping Li,Wei Li,Zhifeng Gao,Kajia Wei,Hongwei Zhu,Liankai Gu,Yun Jiang,Weiqing Han
Br − -containing wastewater has the risk of increasing Br − levels in receiving bodies if released into aquatic environments. Electrochemical oxidation is regarded as an ideal method for Br − removal and Br 2 extraction because of its simple procedure and high efficiency. In this work, a novel oxygen vacancy enriched Ti/O v -Co 3 O 4 -NRs electrode was fabricated and used for Br − removal and Br 2 extraction in Br − -containing wastewater. Characterization and experimental results showed that the Ti/O v -Co 3 O 4 -NRs electrode has more prominent bromine evolution reaction (BER) performance than several commercial electrodes (graphite, Ti/RuO 2 -Ir, Ti/PbO 2, etc.). Notably, the construction of oxygen vacancies obviously accelerated the removal of Br − (53 % improvement) by facilitating Br − adsorption and electron transfer. In addition, the influence factors such as initial pH, initial Br − concentration, current density, coexisting ions and temperature on Br − removal were optimized. The Ti/O v -Co 3 O 4 -NRs electrode also exhibited highly stable catalytic activity and conductivity. After 10 cycles, the removal rate of Br − decreased by 2.20 %, and the yield of Br 2 decreased by 3.6 %. In actual applications, the unit energy consumption reached 1.59–1.76 kJ·g −1 Br, and the current efficiency remained above 70 % throughout the whole treatment process. In addition, >80 % of the TOC could be removed during Br 2 extraction, which was more acceptable than the current reported experimental value of electrochemical Br 2 extraction and exhibited great application prospects.
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INORGANICA CHIMICA ACTA
·
2024
·
IF 2.7
Xinfeng zhu,Tuo Wang,Jiawei Sun,Jiaxuan Li,Jingyu Wang,Junning Wang,Rongfu Peng,Zhengjie Li,Jingquan Liu,Libin Jiang,Kai Wang,Dandan Pang,Xueping Liu,Chaohai Wang,Jinhui Zhang
A series of ZIF-67-derived materials have been prepared by stirring and roasting ZIF-67 at different temperatures and used to activate persulfate for oxidation of tetracycline. Compared with Co 3 O 4 and common MOFs (MiL-100-Fe, UiO-66, and ZIF-67), ZIF-67-derived materials exhibit excellent catalytic activity. A 95.06 % removal has been achieved for 20 mg/L tetracycline at a catalyst dosage of 0.6 g/L, PMS dosage of 0.2 g/L. The N 2 adsorption/desorption experiment and the SEM analysis show that the large specific surface area favors the full contact between the active sites and the pollutants, and the regular pore structure is conducive to the diffusion and mass transfer of the pollutants. Moreover, XRD, Raman, and XPS studies demonstrate that a suitable calcination temperature can promote the formation of oxygen vacancies and active Co 2+ , essential for the formation of active oxygen species. The free radical scavenging experiment reveals that ·O 2 – is the main active species, followed by 1 O 2 . The effects of catalyst dosage, PMS dosage, initial pH, and coexisting ions on tetracycline oxidation are also investigated. Thus, this study provides the theoretical basis and practical evidence for activating PMS as a high-performance catalytic material for the degradation of antibiotics in water.
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Nanoscale
·
2024
·Vol. 16
·期 36
·17009-17023
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IF 5.8
Congcong Wang,Suili Shi,Boya Liu,Guorong Wang,Zhiliang Jin
Rational design and synthesis of a unique heterojunction photocatalyst structure is an important strategy to enhance its performance and structural stability. Herein, Co9S8/MnCdS/Co3O4 photocatalysts with double S-scheme heterojunctions were successfully prepared by coupling Co9S8 and Co3O4 sheet structures with n-type MnCdS nanoparticles through a simple solvothermal and mechanical mixing method. The construction of the dual S-scheme heterostructure offers the possibility to expand the light absorption range, extend the carrier lifetime and maximise the redox capacity. In addition, the mechanism of charge transfer and the reason for the improvement of photocatalytic activity were explored through photoelectrochemical characterization. The lamellar structures of Co9S8 and Co3O4 not only provide excellent dispersion and slow down the agglomeration of MnCdS nanoparticles, but also promote charge transfer, which improves the photocatalytic hydrogen production effect. Under simulated solar irradiation, the evolution rate of H2 after 5 h was as high as 46.44 μmol, which was 3.49 and 1.49 times higher than those of pristine MnCdS and MnCdS/Co3O4, respectively. Meanwhile, it has good stability under 20 h irradiation. This work demonstrates a novel idea for the rational design of double S-scheme photocatalysts with efficient space separation.
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JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
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2024
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IF 4.3
Qinxing Xie,Peng Zhao,Dongliang Xie,Yingqiang Zhao,Shoumin Zhang,Weiping Huang
Electroactive cobalt oxide (Co 3 O 4 ) exhibits great promise as an anode material for lithium-ion batteries (LiBs) owing to its high theoretical capacity. However, its potential application faces challenges posed by low conductivity and poor cycling stability. In this study, a comprehensive multi-strategic approach was employed to fabricate a high-performance Co 3 O 4 -based anode. The approach involved utilizing Co–Cu bimetallic metal-organic frameworks (MOFs) anchored on a stainless-steel mesh (SSM) as the precursor. The resulting free-standing anode comprises Cu-doped porous Co 3 O 4 nanosheets , offering several advantageous characteristics such as being binder-free, possessing a hierarchically porous architecture, and demonstrating improved conductivity and structure stability. This combination of merits results in a material that exhibits significantly enhanced electrochemical performance , featuring high specific capacity, excellent cycling stability, and remarkable rate performance. This multi-strategic exploration of metal oxides with tailored surface area and pore size enables the precise design and fabrication of advanced anodes, specifically optimized for the demanding requirements of LiBs.
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Journal of Materials Chemistry A
·
2024
·Vol. 12
·期 28
·17463-17470
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IF 10.7
Shiqiang Sun,Guoling Li,Shanhui Zhu,Wenhao Meng,Leilei Xu,Jinlong Jiang,Fagen Wang,Xingyun Li
Precise defect engineering of metal oxide catalysts holds great importance for improving catalytic oxidation reactions. In this work, a judicious strategy by doping and partially de-doping of Cr atoms was orchestrated to produce a defect-containing Co3O4 catalyst. The co-existence of the remaining Cr dopant and some metal vacancies could synergistically contribute to the distortion of the crystal structure, Co–O bond activation, generation of abundant active oxygen species and enhancement of oxygen reactivity. Consequently, the catalytic performance for the methane oxidation reaction was significantly boosted, with a methane conversion rate normalized by the specific surface area of 0.114 μmol m−2 s−1, 1.41 times that of the pure Co3O4 catalyst at a reaction temperature of 295 °C. This work provides a viable methodology for improving Co3O4 catalysts for efficient methane oxidation.
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SYNTHETIC METALS
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2017
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IF 2.435
Binghu Wang,Wensheng Tan,Renjun Fu,Huihui Mao,Yong Kong,Yong Qin,Yongxin Tao
Hierarchical mesoporous Co 3 O 4 /C@MoS 2 core-shell structured materials are synthesized via a two-step calcination and a solvothermal method using cobalt metal-organic frameworks (cobalt-MOFs, ZIF-67) and (NH 4 ) 2 MoS 4 as the precursors of Co 3 O 4 /C and MoS 2 , respectively, which is a new class of core-shell materials as supercapacitor electrode materials. The obtained Co 3 O 4 /C@MoS 2 exhibits high specific capacitance (1076 F g −1 at 1 A g −1 ), rate capability (76.9% capacitance retention at 10 A g −1 ) and cyclic stability (64.5% capacitance retention after 5000 cycles at 10 A g −1 ). Moreover, the content of MoS 2 greatly influences the electrochemical performances of the obtained core-shell materials. The results demonstrate that the as-synthesized ZIF-67 can be used as a promising candidate for designing Co 3 O 4 based core-shell materials used in supercapacitors.
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Materials
·
2024
·Vol. 17
·期 9
·2019
·
IF 3.1
Jinteng Qi,Miao Yu,Yi Liu,Junting Zhang,Xinyi Li,Zhuo Ma,Tiedong Sun,Shaoqin Liu,Yunfeng Qiu
Medical titanium-based (Ti-based) implants in the human body are prone to infection by pathogenic bacteria, leading to implantation failure. Constructing antibacterial nanocoatings on Ti-based implants is one of the most effective strategies to solve bacterial contamination. However, single antibacterial function was not sufficient to efficiently kill bacteria, and it is necessary to develop multifunctional antibacterial methods. This study modifies medical Ti foils with Cu-doped Co3O4rich in oxygen vacancies, and improves their biocompatibility by polydopamine (PDA/Cu-Ov-Co3O4). Under near-infrared (NIR) irradiation, nanocoatings can generate •OH and1O2due to Cu+Fenton-like activity and a photodynamic effect of Cu-Ov-Co3O4, and the total reactive oxygen species (ROS) content inside bacteria significantly increases, causing oxidative stress of bacteria. Further experiments prove that the photothermal process enhances the bacterial membrane permeability, allowing the invasion of ROS and metal ions, as well as the protein leakage. Moreover, PDA/Cu-Ov-Co3O4can downregulate ATP levels and further reduce bacterial metabolic activity after irradiation. This coating exhibits sterilization ability against bothEscherichia coliandStaphylococcus aureuswith an antibacterial rate of ca. 100%, significantly higher than that of bare medical Ti foils (ca. 0%). Therefore, multifunctional synergistic antibacterial nanocoating will be a promising strategy for preventing bacterial contamination on medical Ti-based implants.
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JOURNAL OF HAZARDOUS MATERIALS
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2024
·
IF 12.2
Yujie Wang,Chen Yan,Yu Bingliang,Yaru Yang,Ningru Wang,Jingren Yang,Bin Li,Yanwei Li,Xing Xu
Developing efficient and eco-friendly technologies for treating the antibiotic wastewaters is crucial. At present, the catalysts with metal-nitrogen (M-N x ) coordination showed excellent Fenton-like performance but were always difficult to realize practical antibiotics degradation because of their complicated preparation methods and inferior stability. In this work, the Co-N x configuration was facilely reconstructed on the surface of Co 3 O 4 (Co-N x /Co 3 O 4 ), which exhibited superior catalytic activity and stability towards various antibiotics. DFT results indicated that stronger ETP oxidation will be triggered by the electron-donating pollutants since more electrons can be easily migrated from these pollutants to the Co-N x /Co 3 O 4 /PMS complex. The Co-N x /Co 3 O 4 /PMS system could maintain superior oxidation capacity, high catalytic stability and anti-interference due to (i) the strong nonradical ETP oxidation with superior degradation selectivity in Co-N x /Co 3 O 4 /PMS system, and (ii) the synchronously enhanced radical oxidation with high populations of non-selective radicals generated via activating PMS by the Co-N x /Co 3 O 4 . As a result, the synergies of synchronously enhanced dual oxidation pathways guaranteed the self-cleaning properties, maintaining 98 % of activity after eight cycles and stability across a wide pH range. Basically, these findings have significant implications for developing technologies for purifying antibiotic wastewater.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2024
·
IF 5.8
Zerong Wang,Huimin Yin,Yingli Guo,Yongtao Gao,Junhui Liu,Junhe Han,Mingju Huang
Using solar energy for photocatalytic degradation of pollutants is a clean and effective method for treating the increasingly severe problem of environmental pollution. Herein, porous ZnO/Co 3 O 4 cages with improved charge separation ability was designed via a facile ZIF-8@ZIF-67-derived approach for tetracycline (TC) photodegradation. Great photodegradation performance and good stability were achieved. The degradation rate was as high as 97 % within 60 min. The enhancement mechanism of TC photodegradation was investigated. The porous structure of ZnO/Co 3 O 4 produced a number of active sites. The effective utilized spectrum was extended from the ultraviolet to the red region. The presence of two mixed valence states of Cobalt, Co 2+ and Co 3+ , increased the density of defect states and was conducive to the adsorption of TC. The composite had a Z-scheme heterojunction, in which strong oxidative capacity can be maintained, combination of electrons and holes was greatly reduced and efficient charge transfer occurred. This study would give new insights into the design of new photocatalysts with synergetic enhancement effect for TC photodegradation.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2025
·
IF 9
Fang Yuan,Jialin Liang,Shixuan Wang,Jiajia Wang,Bo Chen,Gaofeng Wang,Chunquan Li,Zhiming Sun
Herein, in-situ self-assembly of ZIF-67 derivative on the surface of stilbite and the doping of Ni ions into the Co 3 O 4 lattice were simultaneously achieved through a one-step calcination method. The obtained Ni-doped Co 3 O 4 /stilbite (Ni-Co-AS) exhibited efficient photo-assisted thermal catalytic purification of formaldehyde (HCHO). The results showed that after being regulated by Ni-doped, the Ni-Co-AS composite could achieve efficient photo-assisted thermal catalytic degradation of HCHO driven solely by light. The HCHO removal rate and mineralization rate could reach 93.04 % and 88.60 % within 3 h, respectively. In addition, in order to further improve the photothermal conversion performance of Ni-Co-AS, the composite fiber felt (Ni-Co-AS/F) was prepared from Ni-Co-AS. The conditional experiments show that thermal catalysis is the main mechanism in the photothermal catalytic degradation of formaldehyde by Ni-Co-AS/F. Compared to the pure thermal catalysis (180℃), the presence of light helps to reduce the reaction temperature (120℃) and plays a role in co-catalysis. Ni-Co-AS/F could achieve a higher mineralization rate than that of Ni-Co-AS composite (91.66 %) within 3 h due to the better dispersion and quantum transmission efficiency. In dynamic and long-term degradation experiments, the Ni-Co-AS/F exhibited excellent catalytic performance under the appropriate temperature (35 ± 0.5℃) and humidity (45 ± 3 %) required for the HCHO degradation. This work could effectively provide an efficient and sustainable catalytic material for air pollution control.
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ENVIRONMENTAL RESEARCH
·
2025
·
IF 7.7
Jiani Qin,Minna Duan,Yi Zhang,Ruochen Hua,Yongqi Zhang,Chuanyi Wang,Bao Pan
The widespread use of tetracycline (TC) antibiotics poses significant environmental and health risks due to their persistence and toxicity in aquatic ecosystems. In this study, a heterogeneous catalyst composed of Co 3 O 4 supported on graphitic carbon nitride (Co 3 O 4 /CN) was developed to efficiently activate peroxymonosulfate (PMS) for TC degradation. A series of Co 3 O 4 /CN composites with different cobalt loadings were synthesized via a straightforward pyrolysis process. The optimized 12 %Co 3 O 4 /CN sample exhibited an enhanced specific surface area, abundant nitrogen vacancies, and improved electron transfer efficiency, achieving 86.6 % degradation of TC within 30 min, with 5.4-fold enhancement in reaction rate constant than PMS-only systems. Consistently high degradation efficiencies were also observed for various other micropollutants. Mechanism investigations revealed that O 2 · - radicals played a dominant role in TC degradation, while SO 4 · - , 1 O 2 , and ·OH radicals also contributed significantly, all synergistically promoted by the redox cycling of Co 2+ /Co 3+ species and the presence of nitrogen vacancies. Notably, the catalytic system exhibited broad pH adaptability, excellent reusability, and effective mineralization capacity. Toxicity assessment further indicated a reduced ecotoxicity of TC degradation byproducts. This study thus offers a promising and environmentally sustainable solution for the effective remediation of antibiotic-contaminated wastewater.
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