Inorganic Chemistry Frontiers
·
2024
·
IF 6.1
Teng You,Shuang Xiao,Ping Huang,Chunyan Wang,Qiuxia Deng,Ping Jiang,Daiping He
Co3O4 has been explored extensively for glucose electrochemical detection, while it suffers from limited performance, due to the poor electrical conductivity originated from its semiconductor nature. Photethermal effect (PE) localized on the electrode surface has been illustrated as an attractive strategy in boosting water electrolysis, yet little insight was thrown on glucose electrochemical detection. In this paper, a one-stone-two-birds strategy to integrate PE and electrocatalytic activity of Co3O4 nanowires array supported on nickel foam (Co3O4 NWs/NF) was proposed for glucose electrochemical detection. Under near-infrared (NIR) light irradiation, the temperature of Co3O4 NWs/NF electrode was elevated, along with an enlarged electrochemical surface area (ECSA) and accelerated electron transfer process. PE assisted Co3O4 NWs/NF (PE- Co3O4 NWs/NF) shows high performance in glucose sensing, with a wide linear range from 1 μM to 0.73 mM, an excellent sensitivity of 26.17 mA mM-1 cm-2 and a low limit of detection of 0.56 μM. Moreover, PE-Co3O4 NWs/NF shows good feasibility and reliability for glucose determination in human serum samples. This work proposes a photothermal electrocatlytic dual functional system for glucose electrochemical sensing, and provides a novel approach in boosting Co3O4 catalytic activity in glucose detection.
研究领域:
生物传感
·
电化学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2014
·
IF 4.086
Si Xiao,Jiarui Cui,Pengfei Yi,Ying Yang,Xueyi Guo
Agarose–based electrolyte containing magnetic Co 3 O 4 nanoparticles is studied for quasi–solid–state dye–sensitized solar cells (DSSCs) under external magnetic field treatment. SEM studies reveal the existence of oriented microstructure in Co 3 O 4 –modified agarose electrolyte film under proper magnetic field intensity. The formation mechanism of this ordered structure induced by magnetic field is analyzed. The impedance analysis shows that the ionic conductivity of Co 3 O 4 –modified agarose electrolyte is obviously increased by applying magnetic field intensity of 25 mT. Improved electron recombination process and photoelectric performance are observed in DSSCs under certain magnetic field treatment by electrochemical impedance spectra (EIS) and photovoltaic studies. The DSSC treated with magnetic field can maintain the efficiency unchanged for 434 hours without sealing. This is attributed to the high ionic conductivity and improved electron transfer process in DSSC resulting from the magnetic field treatment. Comparison of photovoltaic performances for Co 3 O 4 and NiO modified DSSCs under 25 mT magnetic field treatment shows that Co 3 O 4 -modified DSSC exhibits higher energy conversion efficiency than that of NiO-modified one at the same condition.
研究领域:
材料科学
·
能源科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2020
·
IF 3.83
Bo Yu,Fanming Meng,Muhammad Wasim Khan,Rui Qin,Xingbin Liu
Traditional bulk photocatalysts often experience serious charge recombination and poor visible-light capturing, resulting in inefficient photocatalytic activity. However, proper nanostructure design usually helps to increase the activity of composite photocatalysts. Here, hollow TiO 2 @g-C 3 N 4 /Co 3 O 4 core-shell microspheres are first reported. The hollow structure of the heterostructured will directionally separate the photogenerated carriers, and the photogenerated holes transferred to the surface will be further captured by Co 3 O 4 to achieve an exposed oxidized surface. The novel multi-stage hollow microspheres can simultaneously achieve effective transfer of photogenerated carriers and extended light absorption. Benefiting from these structural and compositional characteristics, the optimized TiO 2 @g-C 3 N 4 /Co 3 O 4 nanospheres have excellent photodegradation activity for tetracycline and MO. Under simulated sunlight, the degradation rates of TC (10 mg/L) and MO (25 mg/L) at 60 min are 91.6% and 97.8%, respectively. At the same time, high activity is maintained after multiple cycles of testing. Possible transfer paths for photogenerated carriers have also been proposed. This work will provide more inspiration for the design of multi-stage hollow photocatalytic systems.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
FUEL
·
2024
·
IF 6.7
Juzhi Leng,Xinru Yang,Qi Zeng,Wenting Chen,Shupeng Guo,Min Zhong,Lili Liu,Yunlei Chen,Pengju Yang,Mingqi Li
Photochemical reduction of CO 2 (CO 2 RR) to syngas is an attractive approach for carbon–neutral recycling. Manipulating binding strength to reactive species on catalyst surfaces is challenging but essential for achieving efficient syngas production with a desired CO/H 2 ratio. Here, we demonstrate that the binding strength to key reaction intermediates (*CO 2 , *H and *CO) on the Co 3 O 4 surface can be fine-tuned by incorporating varying amount of Zn atoms. Dedicated experiments and theoretical simulations unveil that Zn doping allows for simultaneous control of both CO 2 adsorption/activation and the adsorption affinity of *CO on Zn-Co 3 O 4 catalysts, resulting in a significant enhancement in CO 2 to CO conversion. Moreover, Zn doping can alter the hydrophilicity of the catalyst surface, affecting the water adsorption behavior and adjusting the hydrogen evolution reaction (HER) activity. As a result, the CO/H 2 ratio can be readily tuned via varying the Zn doping level. This study presents an effective and economical method approach to manipulate the electronic structure of catalyst surfaces for controlling the kinetics of CO 2 RR and HER reactions, providing valuable insight into the design of highly active transition metal oxides (TMOs) based photocatalysts for syngas production with a tailored CO/H 2 ratio.
研究领域:
材料科学
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化学工程
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2018
·
IF 5.116
Kun Wu,Dazhong Shen,Qingtian Meng,Jiahai Wang
The preparation of hydrogen by electrochemical water splitting consists of two processes, i.e., hydrogen evolution reaction (HER) and oxygen evolution reaction (OER). It takes scientists a great deal of effort to design and synthesize electrocatalytic materials with high catalytic properties, low fabrication cost and simple synthesis method. In this paper we report the synthesis of the octahedral Co 3 O 4 particles by a simple hydrothermal method , with the double-layer capacitance (C dl ) 154.85 mF cm −2 , and a lot of {111} high-index facets exposed. The Co 3 O 4 of this structure not only contains oxygen vacancies and hydroxyl groups on the surface, but has a high electrochemical surface area. The synergistic effect of these features makes it a high efficiency catalyst for HER and OER. The bright performance is manifested in that the HER in an alkaline medium requires only 77.9 mV overpotential for a current density of 10 mA cm −2 , and the OER needs 301.2 mV overpotential for a current density of 10 mA cm −2 , while during the electrolytic overall water splitting, it just needs 1.60 V for a current density of 10 mA cm −2 . The durability test also shows good performance of the material both for the HER and OER processes with the tolerating time of Chronoamperometry (j-t) curve test for 20 h. This work not only proves the efficient catalytic performance of this material, but also has the guiding significance for the large volume synthesis of electric catalysts used in industry.
研究领域:
材料科学
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电化学
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催化作用
✓ 已验证
产品关联
DOI
高影响因子
Journal of Environmental Chemical Engineering
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2021
·
IF 5.909
Hailu Fu,Jilei Lin,Shuang Cao,Bosheng Chen,Renhua Huang,Hao Chen,Tao Ding,Pengfei Sun,Ligang Luo
A series of cobalt-based catalysts (Co 3 O 4 , Mn/Co 3 O 4 , K-Co 3 O 4, and K-Mn/Co 3 O 4 ) were prepared for toluene catalytic combustion and anti-K poisoning experiments. Co 3 O 4 catalyst has exhibited good performance in toluene oxidation , but it has poor anti-K poisoning performance. The Mn/Co 3 O 4 catalyst has shown excellent low-temperature catalytic activity , good resistance to K poisoning at T 90 of 226 °C, and achieved a complete toluene conversion at about 235 °C; the activity after the addition of K slightly reduced at T 90 of 237 °C. A series of characterizations indicated that adding Mn can effectively promote the Co 2+ ↔Co 3+ cycle, increase the Co 3+ content on the catalyst surface, and enhance the redox performance of the catalyst. On the other hand, MnO x intercepts K species and generates Mn-O-K, blocking most of the poisonous effects of K on cobalt oxide , thereby protecting the active species (Co 3+ and surface-adsorbed oxygen) and acidic sites on the Co 3 O 4 surface. Finally, GC-MS and in-situ infrared characterization were adopted to investigate the reaction mechanism of the catalysts. Two reaction paths of the Co 3 O 4 catalyst may co-occur. Still, the reaction path of the Mn/Co 3 O 4 catalyst is relatively simple; that is, the chemically adsorbed toluene molecules are oxidized through surface-active oxygen, after which various intermediate by-products are formed successively. Finally, they are completely degraded into CO 2 .
研究领域:
环境科学
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催化化学
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2017
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IF 6.216
Yan Fan,Yuefei Ji,Guanyu Zheng,Junhe Lu,Deyang Kong,Xiaoming Yin,Quansuo Zhou
Herbicide atrazine (ATZ) has caused great environmental concern due to its long-term application in agriculture and persistence nature. This study examined the degradation of ATZ in heterogeneously activated peroxymonosulfate (PMS) oxidation processes, using Co 3 O 4 as the catalyst, finding that high PMS concentrations and near neutral pH (pH 6.0) were beneficial for ATZ degradation. ATZ degradation rate was influenced by functional groups present on the Co 3 O 4 surface at varying pH. Complete removal of 20 μM ATZ was achieved in 15 min, with 2.0 mM PMS and 0.4 g/L Co 3 O 4 at pH 6.0. Minimal cobalt leaching occurred during reaction, shown by a maximum dissolved Co concentration (0.06 mg/L) found at pH 3.0 and decreasing with increasing pH. During the reaction, Co 3 O 4 showed high potential for reusability. Structural properties of the pristine and used Co 3 O 4 catalysts were characterized by scanning electron microscope; X-ray diffraction; and X-ray photoelectron spectroscopy, with no changes observed post-reaction. A total of 7 intermediate products of ATZ were detected by liquid chromatography-tandem mass spectrometry, with quantification of intermediate products allowing the contribution of different pathway for ATZ degradation, to be accessed. Transformation pathways including dealkylation, dechlorination-hydroxylation, and alkylic-oxidation were proposed for catalytic decomposition of ATZ in the Co 3 O 4 /PMS system.
研究领域:
环境科学
·
化学
✓ 已验证
DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2024
·
IF 7.4
Haonan Zhu,Fangyuan Wang,Yingying Cao,Yuhai Yang,Siyu Yang,Zipeng Zou,Fengjie Hu,Feng Chen,Jianping Qiu,Shuang Song
Nb 2 O 5 based photocatalysts have garnered significant attention in the field of antibiotic photodegradation due to their potential. Enhancing the efficiency of carrier separation efficiency still remains a crucial factor for optimizing photocatalytic performance. Herein, a Nb 2 O 5 /Co 3 O 4 p–n heterojunction photocatalyst was synthesized by a straightforward one-step hydrothermal method. The Nb 2 O 5 /Co 3 O 4 composites effectively utilized visible light to catalytically degrade norfloxacin, achieving 89.2% degradation in 90 min. This performance was 2.68 and 7.42-fold greater than pure Nb 2 O 5 and Co 3 O 4 , respectively. Furthermore, this composite maintained its high activity through five cycles of photocatalysis. The exceptional performance was creditable to the establishment of p-n heterojunction structure between Nb 2 O 5 and Co 3 O 4 , which effectively inhibited the electron-hole recombination and distinctly broadens the visible light adsorption region. •O 2 − and h + were confirmed as the critical active species in this process. The primary degradation pathways for norfloxacin were decarboxylation and ring-opening. This study introduced an innovative method for developing and fabricating flower-like Nb 2 O 5 -based heterojunctions for enhancing photocatalytic efficiency. This approach held significant promise for the effective treatment of antibiotic-contaminated wastewater through photocatalysis.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
Catalysis Science & Technology
·
2025
·
IF 4.2
Xiaohui Wang,Zhuang Li,Peng Zhao,Chao Yao,Jie Meng,Shixiang Zuo,Wei Zhu,Jingwei Liu,Fengqin Wu
Natural manganese ore (NMO) has received extensive attention on account of its inherent stability, abundant reserves, and low cost. The higher specific surface area and abundant active sites are considered crucial for catalytic combustion. However, owing to the limited specific surface area inherent to natural manganese ore, we employed an acid etching activation treatment to enlarge the specific surface area of NMO (from 17.8 m2 g−1 to 48.9 m2 g−1). Herein, we successfully fabricated composite catalysts consisting of activated natural manganese ore (HNMO) and Co3O4 using the ethylene glycol sol–gel method and then evaluated them for the catalytic combustion of ethane. Results showed that the catalytic performance of the composite catalysts for ethane could not be enhanced monotonically by increasing the introduction of Co indiscriminately. Among them, the Co2-HNMO catalyst exhibited a higher specific surface area, increased Mn4+ and Co3+ contents and higher oxygen mobility, which were attributed to the significant interaction between Co3O4 and HNMO. The T90 of the corresponding Co2-HNMO catalyst was 294 °C under a space velocity of 40 000 mL g−1 h−1. This work presents new insights into the design and synthesis of efficient composite catalysts based on natural minerals.
研究领域:
化学工程
·
催化材料科学
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Lihong Liu,Ming Yang,Bo Li,Duo zhang,Lihua Huo
In this paper, Au-modified Co 3 O 4 hollow nanospheres/graphene composites (Au-Co 3 O 4 /rGO) were synthesized for the first time through a novel “one-pot cooking” method at ambient temperature. The hollow nanospheres exhibited a particle size of approximately 10–15 nm, while the modified Au nanoparticles were about 4–5 nm in diameter. A high-efficiency and high response H 2 S gas sensor was constructed based on Au-Co 3 O 4 /rGO ternary composites. The effects of different Au modifying mass ratios on the H 2 S gas-sensitive performance of the composites were systematically investigated. At an operational temperature of 92 °C, the Au-Co 3 O 4 /rGO sensor, incorporating an Au loading mass ratio of 1.3 wt%, exhibited a response value of 175.4 for H 2 S at 100 ppm, a recovery time of 30 s, and a detection limit reaching as low as 10 ppb. This response was tripled compared to the undoped Co 3 O 4 /rGO sensor. At the same time, the H 2 S sensing mechanism by Au-Co 3 O 4 /rGO was discussed in detail.
研究领域:
材料科学
·
传感器技术
·
纳米科技
✓ 已验证
产品关联
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2013
·
IF 3.777
Lian-Kui Wu,Ji-Ming Hu
Nanoporous Co 3 O 4 (po-Co 3 O 4 ) films have been prepared on stainless steel substrate by a novel two-step method. Firstly, a composite Co 3 O 4 -SiO 2 film was fabricated via electrochemical co-deposition under a cathodic potential from the mixed sol-gel precursor. Then, the obtained composite film was underwent consecutive cycling voltammetries in a concentrated KOH solution to etch the SiO 2 component, leading to the formation of po-Co 3 O 4 films. The resultant film electrode exhibits satisfactory electrocatalytic property towards the oxygen evolution reaction (OER).
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
Catalysis Science & Technology
·
2016
·Vol. 6
·期 19
·7273-7279
·
IF 5.287
Guozhu Chen,Qihui Xu,Yong Wang,Guolong Song,Cuncheng Li,Wei Zhao,Weiliu Fan
It is still an important issue to develop a facile, environmentally friendly way to synthesize bimetal oxide materials. In this paper, Co3O4–CeO2 core–shell catalysts were prepared by an interfacial reaction, where Co(CO3)0.35Cl0.2(OH)1.1 nanorods were dispersed in Ce3+ aqueous solution for 2 days, followed by a calcination step. The samples were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), and X-ray photoelectron spectroscopy (XPS). Based on the characterization and comparative experimental results, we proposed that the OH− ions slowly dissociated from the Co(CO3)0.35Cl0.2(OH)1.1 precursor combined with Ce3+ to develop into Ce(OH)3 nanoparticles because of its smaller solubility product constant than that of the Co precursor or Co(OH)2. Neither an additional precipitation agent nor stabilizing molecules were employed during the whole preparation. Raman spectroscopy and H2-temperature programmed reduction (H2-TPR) analysis revealed that there is a synergistic effect between Co3O4 and CeO2 in the as-prepared Co3O4–CeO2 core–shell catalysts, which is responsible for their enhanced catalytic activity toward CO oxidation in comparison to pure Co3O4 and CeO2.
研究领域:
催化材料
·
环境科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）