SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Zhengxu Liu,Yihui Hu,Yushi Huang,Zhengrui Zhang,Yuancai Lv,Minghua Liu
In this study, sludge-derived biochar loaded Co 3 O 4 composite (Co 3 O 4 @SDBC) were successfully synthesized through cobalt impregnation and secondary calcination of sludge-derived biochar precursors. The experimental results demonstrated that the Co 3 O 4 @SDBC catalyst performed exceptionally well for peroxymonosulfate (PMS) activation, with a high degradation efficiency (>99 %) of ofloxacin (OFL) within 10 min under the optimal conditions (a catalyst dose of 0.10 g•L −1 , a PMS dose of 0.975 mM and an initial pH = 6.4), and showed good adaptability across a broad pH spectrum, under the interference of the anions and humic acid (HA), as well as in various water matrices. The results of quenching experiments revealed that the non-radical pathway (especially 1 O 2 and electron transfer) was the dominated reactive ingredients in the PMS activation process induced by Co 3 O 4 @SDBC. Notably, the online electrochemical tests and density functional theory (DFT) results indicated the presence of biochar carrier not only effectively lowered the escape of Co ions, while enhanced the steadiness of Co 3 O 4 @SDBC, but also accelerated the electron transfer, promoted the adsorption and cleavage of PMS, facilitated the redox cycle between Co(II) and Co(III), reduced the reaction energy barriers simultaneously, thereby making it more favourable for the generation of 1 O 2 . Furthermore, the toxicity assessment suggested that the cumulative toxicity of OFL decreased throughout degradation. Overall, this work mechanistically revealed the enhancement of biochar on the Co 3 O 4 @SDBC catalyst, offering a viable method to activate PMS for antibiotic removal and achieving a mutually beneficial strategy for sludge waste resource utilization and environmental remediation.
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高影响因子
Nanomaterials
·
2025
·Vol. 15
·期 10
·752
·
IF 4.3
Chang Feng,Yufeng Chen,Weie Wang,Yanan Niu,Xi Cao,Yuguang Lv
g-C3N4, a biocompatible material, has prominent applications in biology and is ideal for nano-enzyme studies. Though reported as a peroxidase mimic, its activity remains low. This group combined N,S-doped carbon quantum dots (NS-CQDs) with g-C3N4(7NSC-g), verifying its peroxidase-like activity. Based on this, a ternary composite of Co3O4in different forms and 7NSC-g was developed to enhance peroxidase activity, to design a g-C3N4-based composite enzyme. Characterizations determined the composition and morphology. Colorimetry evaluated peroxidase activity, where the simulated enzyme catalyzes blue product formation from the TMB substrate in the presence of H2O2. UV-Vis spectrophotometry measured absorbance changes to determine target concentrations. The results show Co3O4doping improves catalytic activity, with larger specific surface area providing more activation sites. The highest activity of g-C3N4/NS-CQDs/Co3O4was at 5% floral Co3O4, being efficient due to Co3O4’s electron-transfer acceleration and hydroxyl-radical mechanism. Under optimal conditions, the composite detected H2O2(10.0–230.0 μM, detection limit of 0.031 μM) and glucose (10.0–650.0 μM, detection limit of 1.024 μM).
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高影响因子
ACS Sensors
·
2025
·
IF 9.1
Yulin Zhu,Yan Liang,Jianxian You,Dehua Wang,Jiahao Li,Yanxing Yang,Yong Yang
The resistive gas sensors based on semiconductor materials provide an effective strategy for the detection of harmful gases. However, the limitations of surface gas adsorption activity and interface charge transfer efficiency of semiconductor sensing materials, as well as the complex device fabrication process, pose significant challenges to the development of sensors. Here, a ternary Co3O4/ZnIn2S4/Pt heterostructure arrays gas sensor is designed, which consists of Co3O4 nanowire arrays grown in situ on an alumina flat substrate as backbones, ultrathin ZnIn2S4 nanosheets wrapped around the surface of Co3O4 nanowires, and highly dispersed Pt nanoparticles on the outermost layer. It enables superior sensing performance for the detection of the volatile organic compound triethylamine, which exhibits a significant response of ∼118.97 (Ra/Rg) toward 100 ppm of triethylamine at a relatively low working temperature of 200 °C, along with excellent response/recovery speed, selectivity, and enduring stability (over 3 months). Based on first-principles calculation and a series of spectroscopic characterization (including in situ spectroscopy), it is revealed that the heterostructure arrays exhibited enhanced adsorption activity for both oxygen and triethylamine molecules. Most importantly, the robust p-n heterointerface (Co3O4/ZnIn2S4) and semiconductor-metal heterointerface (Co3O4/Pt, ZnIn2S4/Pt) are formed in the ternary heterostructure, achieving efficient multi-interface charge transfer characteristics. In addition, thanks to the design of in situ 1D/2D/0D porous array structures, the ternary Co3O4/ZnIn2S4/Pt heterostructure arrays not only have large specific surface areas for gas reaction but also simplify device manufacturing. This research offers novel perspectives on boosting the gas sensing performance of semiconductor materials through the comprehensive design of ternary heterostructures with robust multi-interfaces.
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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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ACS Sustainable Chemistry & Engineering
·
2025
·
IF 7.3
Ruyan Chen,Yanan Li,Jiahong Li,Changqing Liu,Cheng-Xin Li
The relatively poor sintering ability of lanthanum-doped strontium titanate (LST) interconnects presents a challenge for co-sintering with cell green bodies. This issue needs to be addressed to advance the development of flat-tubular segmented-in-series solid oxide fuel cells (FT-SIS-SOFCs). This work achieved low-temperature fabrication of industrial-sized FT-SIS-SOFCs by establishing a microstructural engineering approach to overcome the intrinsic low sinterability of perovskite-type LST interconnects via Co3O4 modification. The results show that the modification of Co3O4 had a significant promotion effect on the densification of LST by reducing the sintering activation energy and can achieve high density at 1350 °C and excellent structural stability. The modification of Co3O4 can enhance conductivity of LST under an air atmosphere by substitution of Co3+ ions for Ti4+, while it causes a decrease in conductivity under a hydrogen atmosphere due to the reduced concentration of Ti3+. Moreover, the prepared five-cell FT-SIS-SOFCs with a size of 75.8 × 59.5 mm exhibited a high voltage of 5.33 V, peak power density of about 85 mW/cm2 at 800 °C, and excellent long-term stability. Ultimately, 14-cell FT-SIS-SOFCs measuring 151.5 × 59.5 mm were successfully fabricated for the first time, demonstrating excellent output performance and stability as well, with a power density of 96 mW/cm2 at 800 °C.
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高影响因子
International Journal of Minerals Metallurgy and Materials
·
2025
·Vol. 32
·期 11
·2806-2813
·
IF 7.2
Yu Zidong,Liu Xiaojuan,Liu Zhicheng,Liu Ye,Su Chao,Sun Zhi,Du Jilei,Wei Tao
Sodium-ion batteries (SIBs) have recently gained wildly interest due to the abundance of sodium, lower production costs, and better low-temperature performance compared to lithium-ion batteries (LIBs). Among various cathode materials of SIBs, O3-type NaNi 0.4 Fe 0.2 Mn 0.4 O 2 (NFM424) demonstrates high capacity and ease of synthesis, yet suffers from structural degradation and sluggish Na + kinetics caused by large ionic radius and strong electrostatic interactions. To overcome these issues, a configuration strategy combined with TiO 2 and Co 3 O 4 by a simple solid-state reaction method was introduced to improve structural and electrochemical stability. XRD, SEM, TEM, and various electrochemical characterizations as well as TGA/DSC tests were conducted. The resulting NaNi 0.4 Fe 0.2 Mn 0.3 Co 0.05 Ti 0.05 O 2 (NFMCT) cathode mitigated Jahn-Teller distortions and Na + /vacancy ordering while enhancing phase integrity and diffusion pathways. The obtained NFMCT maintained 93.7 mAh·g −1 after 550 cycles at 1 C, with superior rate capabilities at 2 C and 5 C. These findings deepen the understanding of configuration strategy by using multi-element oxide and highlight a practical strategy for designing high-performance SIB cathodes.
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高影响因子
Journal of Materials Chemistry A
·
2017
·Vol. 5
·期 22
·11163-11170
·
IF 8.867
Lifeng Hang,Yiqiang Sun,Dandan Men,Shengwen Liu,Qian Zhao,Weiping Cai,Yue Li
Hierarchical micro/nanostructured C doped Co/Co3O4 hollow spheres were prepared by two-step treatment (annealing at 600 °C in an Ar atmosphere and then at 250 °C in air) of PS@Co(OH)2 core–shell structures templated from PS microspheres without any modification. In 1 M KOH, such hollow nanospheres showed an overpotential of 352 mV at a benchmark oxygen evolution reaction (OER) current density of 10 mA cm−2, which was lower than that of RuO2 (364 mV), Co3O4 hollow nanospheres (410 mV) and C-Co/Co3O4 nanoparticles (462 mV). Importantly, the C-Co/Co3O4 hollow spheres exhibited a small onset potential (1.49 V) due to their more active sites, higher electrical conductivity, larger specific surface area, and excellent electron and ion diffusion permeability. This work provides a strategy to design and fabricate earth-abundant, low-cost electrocatalysts for water splitting in practical applications.
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高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2021
·Vol. 56
·期 11
·6689-6703
·
IF 4.22
Cao Yanming,Zhang Dongbin,Kong Xianggui,Zhang Fazhi,Lei Xiaodong
Abstract Introducing anion and cation vacancies into Co-based oxides is a promising strategy to promote their catalytic activity. However, the mild and effective methods for synthesizing cobalt oxide and vacancies are rarely proposed. In this work, via an innovative one-step hydrothermal process, we synthesized Co 3 O 4 -based catalyst, which was successively proven rich with oxygen vacancies (V O ) and cobalt vacancies (V Co ). As an electrocatalyst for benzyl alcohol (BA) oxidation, the vacancy-rich Co 3 O 4 on nickel foam (NF) with optimized electronic structure displayed a super high conversion (> 99%) and selectivity (> 99%) for benzoic acid (BAc) with excellent recyclability, representing one of the best Co‐based catalysts. X-ray photoelectron spectroscopy (XPS) and X-ray adsorption near-edge structure (XANES) technologies coupled with density functional theory calculations (DFT) demonstrated the obvious electronic delocalization caused by vacancies not only lowered the adsorption energy of BA and improved the intrinsic activity of catalytic Co sites for faster reaction kinetics, but also narrowed the band gap for better electrical conductivity. This work opens up a new simple synthetic idea to construct the high-performance electrocatalysts by tuning electronic structure. Graphical abstract
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
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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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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高影响因子
MICROCHIMICA ACTA
·
2019
·Vol. 186
·期 3
·1-10
·
IF 5.479
Liu Lihong,Yang Ming,Zhao Hui,Xu Yingming,Cheng Xiaoli,Zhang Xianfa,Gao Shan,Song Haiyan,Huo Lihua
Co 3 O 4 /carbon hybrid hollow nanospheres (hs-Co 3 O 4 /C) with an empty cavity and a thin shell, were synthesized starting from the pectin and cobalt acetate via cross-linking deposition at room temperature and post-calcination. The hierarchical structure is constructed from the interconnected nanoparticles in the residual carbon matrix, and the carbon content can be adjusted by changing the calcination temperature. The gas sensor based on hs-Co 3 O 4 /C calcined at 300 °C in air shows high response towards 50 ppm of H 2 S (S = 95.5) and good selectivity at a low working temperature (92 °C). The detection limit is as low as 0.1 ppm. The non-enzymatic glassy carbon electrode based sensor constructed from the same material exhibits excellent electrocatalytic activity for H 2 O 2 with the sensitivity of 405.8 μA∙mM∙cm −2 at 0.3 V (vs. SCE) in alkaline solution. The chronoamperometric response time is < 3 s and the detection limit (at S/N = 3) is 0.30 μM. The good sensing performances are attributed to the synergetic effect of unique hollow nanostructure and appropriate amount of carbon in the hybrid material. The porous nanostructure can increase the mass transfer efficiency, and the cross-linked nanoparticles with good crystallinity also improve the conductivity of materials. The presence of carbon enhances the charge transfer ability and increases the specific surface, thereby improving the sensor performance.
Schematic illustration of the formation of hollow Co 3 O 4 nanospheres composited with pectin-derived carbon. The material displays excellent selectivity for H 2 S gas and in non-enzymatic detection of dissolved H 2 O 2 .
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2017
·
IF 6.216
Bin Wang,Xiao-Ying Lu,Chi-Wing Tsang,Yuanhao Wang,Wai Kuen Au,Hongfan Guo,Yuanyuan Tang
Rational structure design of anode materials plays crucial roles in the continuous improvement of electrochemical lithium storage performance for high performance lithium-ion batteries (LIBs). In this study, a novel hierarchical straw-sheaf-like Co 3 O 4 (Co 3 O 4 -SSL) composed of numerous strongly tied nanoneedles was successfully synthesized with hydrothermal route by a charge-driven self-assembly strategy. Material characterizations indicated that typical length of nanoneedles was about 10 µm and the average diameter was about 80 nm. Mechanism studies implied that positively charged diallyldimethylammonium chloride (DDA) molecules played a key role in the formation of straw-sheaf-like structures. Impressively, when Co 3 O 4 -SSL was investigated as anode materials for electrochemical lithium storage, high specific capacity (e.g. 842.9 mAh g −1 after 300 cycles tested at 500 mA g −1 ), superior cycling stability (e.g. capacity retention of about 100% over 300 cycles) and excellent rate capability (e.g. 707 mAh g −1 tested at 3000 mA g −1 ) were achieved in the repeated charging-discharging cycles, demonstrating great potentials in energy storage materials. The proposed synthetic strategy is appealing in electrode structure design for next generation LIBs .
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