Surfaces and Interfaces
·
2024
·
IF 5.7
Yanping Zhang,Yinian Zhu,Yinming Fan,Shengpeng Mo,Xiaobin Zhou,Zongqiang Zhu
A set of MOFs-derived Co 3 O 4 @MnO x hollow-sphere were synthesized to develop a catalyst for the photothermal catalytic removal of NO using acetone as a reducing agent. The study systematically investigated the impact of organic ligands and photoactive substances on energy transfer and photothermocatalytic reactions involving acetone and NO under 5 vol % H 2 O with the catalysts. At 240°C, sample C-5/1 (with an organic ligand added and Co/Mn molar ratio of 5/1) demonstrated 75 % NO conversion and 65 % acetone conversion. The highest catalytic performance was observed in the L-Py sample (with photoactive substance was added), achieving 80 % NO and 69 % acetone conversion at 240°C. The catalyst demonstrated low crystallinity, and the introduction structural defects through ligands adjusted the ratio of active components. Meanwhile, enhanced catalytic performance was attributed to light energy scattering in the inner space of microspheres, resulting in the efficient transfer of 2.17 eV energy with the addition of two photoactive substances. The elevated concentration of surface-active oxygen facilitated oxidation, while M n /M n+1 (Mn 3+ /Mn 4+ and Co 2+ /Co 3+ ) redox cycling supplied surface oxygen in the photothermal low-temperature response. The proposed mechanism for the simultaneous degradation of acetone and NO was elucidated using Density Functional Theory calculations.
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Chemical Engineering Journal Advances
·
2020
·
IF 0
Jiuhu Zhao,Zhengzhong Wen,Rongshu Zhu,Zhi Li,Ran Ding,Yongji Zhu,Tingkun Gu,Rong Yang,Zhenye Zhu
In this paper, In-metal oxide/H-Beta catalysts were synthesized by ion exchange method and In-Co 3 O 4 /H-Beta exhibited the highest catalytic activity for the selective catalytic reduction of NO x with CH 4 in presence of H 2 O and SO 2 . Thus, the synthesis conditions of In-Co 3 O 4 /H-Beta were optimized. The results showed that In-Co 3 O 4 /H-Beta exhibited excellent catalytic performance and high CH 4 selectively when the synthesis was carried out by ion exchange method, the ratio of Si and Al in H-Beta was 25, the ratio of Co 3 O 4 and H-Beta was 5:40, the concentration of ion exchange liquid was 0.033 M and calcination temperature was 500 °C. The NO x removal efficiency was about 87.6 % and N 2 selectivity could reach 96.3% in the presence of H 2 O and SO 2 . Through a series of characterizations, it was concluded that In-Co 3 O 4 /H-Beta owned stable catalyst structure, abundant Brønsted acid sites and the highest ratio of InO + /In 2 O 3 under the optimal synthesis conditions. In addition, the doped of Co 3 O 4 could inhibit the adsorption of sulfate species on the surface of In/H-Beta catalyst, leading to the excellent H 2 O and SO 2 resistance property.
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PLASMA SCIENCE & TECHNOLOGY
·
2023
·Vol. 25
·期 10
·104003
·
IF 1.7
Shucheng DI,Jiacheng XU,Shuiliang YAO,Jing LI,Zuliang WU,Erhao GAO,Jiali ZHU,Lianxin DAI,Weihua LIU,Buhe ZHANG,Junwei ZHANG
The plasma catalytic degradation of o-xylene in simulated air was improved by loading low amounts of Pt, Pd, or Au onto Co3O4. At room temperature, o-xylene conversion and COx selectivity using a 0.1 wt% Pt/Co3O4 catalyst reached 98.9% and 80%, and the energy efficiency was at the top level in comparison with values in the literature. A stable o-xylene degradation performance could be obtained by online regenerating the heat-insulated reactor with a high energy density. After characterization, it was found that the loading of nanosized Pt not only increased the Co3+/Co2+ ratio, where the Co3+ benefitted the formation of reactive oxygen species, but also conduced Pt0 to oxygen activation, resulting in effective promotion of complete o-xylene oxidation. Operando plasma diffuse reflectance infrared Fourier transform spectroscopy demonstrated the complete o-xylene oxidation and proved that Pt played a key role in the complete oxidation of o-xylene.
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JOURNAL OF HAZARDOUS MATERIALS
·
2021
·
IF 10.588
Wenying Zou,Yue Tang,Hong Zeng,Chunxiao Wang,Yuangen Wu
The current method for rapid and ultrasensitive detection of multiple heavy metals in environmental water still face challenge. Herein, the porous Co 3 O 4 nanodisks with robust peroxidase-mimicking activity were prepared, and its catalytic activity can be significantly inhibited by the heavy metals like Cd(II), Hg(II), Pb(II) and As, which makes us to establish an ultrasensitive and rapid colorimetric sensor for the detection of multiple heavy metals. Further investigation reveals the anticompetitive inhibition effect of heavy metals on peroxidase-mimicking activity. The colorimetric sensor displays excellent sensitivity and selectivity , and the limits of detection (LOD) for Cd(II), Hg(II), Pb(II) and As are 0.085 μg·L −1 , 0.19 μg·L −1 , 0.2 μg·L −1 and 0.156 μg·L −1 , respectively. Notably, the absorbance variation will be greater than 0.5 as the concentration of heavy metals exceeds 5 μg·L −1 , which can be clearly discriminated by the naked eyes. Moreover, the average recovery range of heavy metals in actual water samples is from 86.9% to 98.3%. The above results indicate that the proposed sensor exhibits excellent practical applicability for the rapid and ultrasensitive detection of multiple harmful heavy metals in several environmental water samples, which has potential bright application in protecting the environment and human health.
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CHINESE JOURNAL OF CATALYSIS
·
2026
·
IF 17.2
Lingtong Ji,Peimeng Qiu,Qingjun Ma,Peng Li,Shengli Chen
Spinel Co 3 O 4 is theoretically predicted as a promising cost-effective anodic electrocatalyst for proton exchange membrane water electrolysis (PEMWE) owing to favorable adsorption energetics. However, the inevitable surface reconstruction under operating conditions severely compromises its long-term activity and stability. Here we report a praseodymium (Pr) and nickel (Ni) co-doped cobalt spinel (PrNi-Co 3 O 4 ) catalyst featuring a spatially selective distribution of uniform bulk Ni doping and spontaneous surface Pr segregation, which realizes a surface-interface synergistic optimization strategy to effectively overcome this bottleneck. Density functional theory calculations and voltammetric investigations reveal that the nickel dopants induce surface pre-oxidation, boosting intrinsic activity while simultaneously increasing the energy for lattice cobalt leaching. Besides, in-situ surface-enhanced infrared absorption spectroscopy demonstrates that surface praseodymium species lowers the water dissociation barrier by decreasing the hydrogen bonding degree, while simultaneously reinforcing stability through the mitigation of metal-oxygen bond polarization and the anchoring of oxygenated intermediates. The assembled PEMWE cell employing the PrNi-Co 3 O 4 anode operates at only 2.02 V at 1 A cm −2 and sustains stable operation for 490 h, placing it at the forefront of reported non-noble metal catalysts. This study helps advance the commercial viability and scalability of green hydrogen production by circumventing the reliance on precious iridium.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2025
·
IF 9.7
Hongfan Huang,Haihui Wu,Jiqing Zhang,Tao Zou,Ende Feng,Xuekun Sui,Wenjing Zhang,Bao Liu,Liu Yang,Xiaohui Guan,Penggang Yin,Guangsheng Wang
Exploiting high-quality cathode materials and optimizing their electrochemical performance for aqueous zinc-ion batteries (AZIBs) is of prominent significance for the advancement of charge storage devices. Herein, a novel zeolitic imidazolate framework assisted synthesis method has been proposed for the first time to prepare C and N co-doped Mn 2 O 3 /Co 3 O 4 cathode (C/N-Mn 2 O 3 /Co 3 O 4 ) with unique hollow hexahedron structure. Theoretical, simulative, and experimental results all reveal that primarily benefiting from synergistic effects, the drawbacks of low structural stability and electrical conductivity for Mn 2 O 3 , and the shortcomings of inferior electrochemical activity and cycling stability for amorphous Co x O y (A-Co x O y ), could be effectively compensated. In addition, the unique hollow hexahedron structure could provide abundant active sites and electron transfer paths, which is conducive to the enhancement of electrochemical activity and kinetics. The zinc battery utilizing C/N-Mn 2 O 3 /Co 3 O 4 as cathode exhibits a high specific capacity of 355.9 mAh·g −1 at 0.1 A·g −1 , which is much higher than that of A-Co x O y . After dozens of cycling at different current densities, the specific capacity could be retained, indicating superior rate performance. Moreover, the specific capacity presents no decrease during initial 600 repeated charge/discharge cycles, suggesting admirable cycling stability. Additionally, the electrochemical kinetics and energy density of the AZIBs are also distinctly improved.
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MICROCHEMICAL JOURNAL
·
2025
·
IF 5.1
Haoran Yang,Xu Zhao,Ke Shang,Yu Zhang,Mian Li,Tingting Liu
Non-noble-metal nanomaterials, characterizing by their low cost, large surface area, abundant active sites, and superior conductivity, play a pivotal role in the development of advanced electrochemical sensors. In this study, cobalt oxalates recovered from waste lithium-ion batteries are employed as cobalt sources to successfully synthesize three-dimensional (3D) porous Co-Co 3 O 4 @NC-CNT microspheres via a straightforward hydrothermal method. The sensors based on Co-Co 3 O 4 @NC-CNT microspheres enable rapid, sensitive, and precise detection of hydrogen peroxide (H 2 O 2 ) and glucose. Under optimum conditions, when used for glucose detection, the Co-Co 3 O 4 @NC-CNT microspheres exhibit a rapid response time of 2.9 s, a low limit of detection (LOD = 0.066 μM), a high sensitivity of 104.73 μA cm −2 mM −1 , and a wide linear range of 0.01 to 16.0 mM. For H 2 O 2 detection, the 3D porous Co-Co 3 O 4 @NC-CNT microspheres demonstrate an excellent sensitivity of 238.74 μA cm −2 mM −1 , a low LOD of 0.128 μM, and a wide linear range of 0.04 to 16.0 mM. In addition, as non-enzymatic sensors for both glucose and H 2 O 2 , the 3D porous Co-Co 3 O 4 @NC-CNT microspheres showcase exceptional stability, repeatability, and remarkable resistance to interference from organic and inorganic molecules. Notably, the electrochemical sensors based on Co-Co 3 O 4 @NC-CNT microspheres demonstrate excellent accuracy in the quantitative determination of H 2 O 2 and glucose concentrations in real samples. This study not only establishes a promising industrial chain for the recycling of cobalt from spent devices to synthesize 3D porous and spherical Co-Co 3 O 4 @NC-CNT catalysts, but also paves the way for the sensitive and rapid detection of H 2 O 2 and glucose concentrations in real samples, along with other biosensing applications.
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DALTON TRANSACTIONS
·
2021
·Vol. 50
·期 30
·10501-10514
·
IF 4.39
Xuqiang Hao,Dingzhou Xiang,Zhiliang Jin
Herein, a novel amorphous monodisperse Co3O4 quantum dots/3D hexagonal CdS single crystals (0D/3D Co3O4 QDs/CdS) p–n heterojunction was constructed by a simple hydrothermal and electrostatic self-assembly method. The amorphous monodispersed Co3O4 QDs (≈4.5 nm) are uniformly and tightly attached to the surface of the hexagonal CdS single crystals. The sample, 0.5% CQDs/CdS exhibits outstanding hydrogen evolution activity of 17.5 mmol h−1 g−1 with a turnover number (TON) of 4214, up to 10.3 times higher than that of pure CdS. The enhanced photocatalytic activity can be attributed to the synergistic effect of the p–n heterostructure and the quantum confinement effect of Co3O4 QDs, which significantly promoted the separation efficiency of photo-generated electrons and holes. Additionally, the sulfur vacancy also can act as electron trappers to improve carrier separation and electron transfer. The photoelectrochemical and time-resolved fluorescence (TRPL) results further certify the effective spatial charge separation. This work gives an insight into the design of the 0D/3D Co3O4 QDs/CdS p–n heterostructure for a highly efficient photocatalysis.
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MICROCHEMICAL JOURNAL
·
2025
·
IF 5.1
Fangzheng Liu,Yunfei Ouyang,Xinyao Xie,Junwei Ke,Lu Qiu,Zhaoyang Zhang,Shiyi Huang,Xiangxiang Chen
To effectively detect the volatile terpineol and butyl xanthate gases produced during the flotation process in mineral processing plants, Co 3 O 4 nanosheets, Co 3 O 4 nanoparticles, and Co 3 O 4 nanoflowers were synthesized via one-pot hydrothermal method as sensing materials. The crystal structure and microscopic morphology of the synthesized materials were characterized using XRD, SEM and TEM, respectively. The specific surface area and pore-size distribution were recorded using BET. The elemental distribution and valence states were analyzed using XPS, and the chemical bonds and functional groups were analyzed using FTIR. The gas sensing properties demonstrated that Co 3 O 4 nanosheets exhibited superior sensing performance over Co 3 O 4 nanoparticles and Co 3 O 4 nanoflowers. The Co 3 O 4 nanosheets showed maximum responses of 8.06 and 9.17 to 50 ppm volatile terpineol and 200 ppm volatile butyl xanthate gases at the optimal operating temperature of 200 °C, respectively, as well as favorable gas sensing response-recovery characteristics and reproducibility. The superior performance is attributed to the abundant oxygen vacancies and the distinctive porous structure of Co 3 O 4 nanosheets. This work significantly contributes to the development of high-performance gas sensors for the mining industry.
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FOOD CHEMISTRY
·
2024
·
IF 8.5
Mingzhe Jiang,Min Wang,Wenjing Lai,Chenglin Hong,Xuetong Song,Siyu Chen
Mycotoxin contamination currently poses a significant concern and presents a major challenge to global food safety management. In this research, gold‑silver nanoclusters (Au-AgNCs) were utilized as platforms for electrogenerated chemiluminescence (ECL) and electrochemical (EC) responses, while polyaniline-coated cobalt tetraoxide and gold (PANI@Co 3 O 4 /AuNPs) served as bifunctional probes with intelligently modulated light/electric signals to develop a dual mode adaptor sensor for sensitive detection of alternariol (AOH). The sensor's benefits are evident in three areas:(1) Bandgap modulation allows Au-Ag to exhibit enhanced light/electric response;(2) PANI@Co 3 O 4 /AuNPs exhibit both ECL quenching effects and the capability to activate KHSO 5 , along with improved electrical conductivity, which collectively improves the sensor's detection performance;(3) The dual-channel signal outputs significantly reduce the risk of false detections. Testing results indicated that the ECL and EC sensors performed exceptionally well across AOH concentration ranges of 0.001–100 ng/mL and 0.01–1000 ng/mL, with detection limit of 0.803 pg/mL and 0.378 pg/mL, respectively.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2026
·
IF 5.4
Wenshuai Si,Yi Shao,Lijuan Chang,Wei Song,Shouying Wang,Zhijie Zhang,Chunxia Yao
A 2D/2D mesoporous Co 3 O 4 /g-C 3 N 4 nanocomposite with triple synergy was constructed. • The Co 3 O 4 /g-C 3 N 4 nanocomposite shows excellent antibiotic removal efficiency. • The photothermal effect accelerates TC degradation by elevating reaction temperature. • This work offers insights into the design of multimodal synergistic photocatalysts for environmental remediation. Developing potent photocatalysts is of great significance for both preventing and remediating antibiotic-polluted environments. In this work, a 2D/2D mesoporous Co 3 O 4 /g-C 3 N 4 (Co 3 O 4 /CN) nanocomposite is constructed and reported as a multimodal antibiotic-degrading photocatalyst featuring triple-function synergy: (1) The mesoporous structure of Co 3 O 4 increases the nanocomposite's surface area, enhancing antibiotic adsorption; (2) Co 3 O 4 /CN exhibits excellent full-spectrum light absorption and remarkable photothermal effect, elevating the temperature of the reaction system to facilitate photodegradation reaction; (3) The p-n heterojunction formed between Co 3 O 4 and g-C 3 N 4 promotes efficient separation of photogenerated electrons and holes. Owing to the combined action of its mesoporous structure, photothermal effect, and efficient charge separation, the Co 3 O 4 /CN nanocomposite demonstrates outstanding photocatalytic performance, with tetracycline (TC) being completely degraded (100% degradation rate) within 100 min. This research offers valuable references for the synthesis of multimodal synergistic photocatalysts applied in environmental remediation. Download: Download high-res image (275KB) Download: Download full-size image This work successfully constructed a 2D/2D Co₃O₄/g-C₃N₄ nanocomposite with triple-function synergy of mesoporous structure, photothermal effect, and p-n heterojunction, which provides valuable references for the design of multimodal synergistic photocatalysts in environmental remediation.
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Energy Technology
·
2024
·Vol. 12
·期 3
·2301166
·
IF 3.6
Yanyi Liu,Jian Wei,Xinyu Qiao,Xueting Li,Hao Zhang,Houfei Xiong
Lithium–sulfur (Li–S) batteries are favored as ideal batteries for next-generation electrical stored energy systems owing to their high theoretical energy diversity and low operating costs. Therefore, the development of Li–S batteries with excellent rate capability and stable cycling is still a challenge. In this article, the electrochemical performance of lithium–sulfur batteries with high capacity and long cycle stability is achieved through dual physical and chemical adsorption effects using polypyrrole (PPy) attached to Co 3 O 4 /TiO 2 heterojunction structures based on metal–organic frameworks (MOFs) backbone materials. Co 3 O 4 /TiO 2 polyhedra form a built-in electric field, which is also a good adsorbent for polysulfides PPy nanotubes have a vacant structure, thus minimizing the volume expansion during deformation and maintaining the stability of the structure. The reversible specific capacities of lithium–sulfur batteries prepared based on Co 3 O 4 /TiO 2 /PPy electrodes are 1095 and 739.4 mAh g −1 at 0.1 C and 1 C multiplicity, respectively, and the capacity retention rate is 77.84% after 500 cycles at 1 C multiplicity. The structural design of the S@Co 3 O 4 /TiO 2 /PPy anode demonstrates an excellent ability to limit LiPS and has great potential to provide a promising avenue for the practical application of lithium–sulfur batteries.
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