APPLIED SURFACE SCIENCE
·
2021
·
IF 6.707
Zhenting Zhao,Yueyun Huang,Qiuguo Li,Haijuan Mei,Fanglong Zhu,Weiping Gong
We demonstrate the fabrication of Co 3 O 4 (derived from zeolitic imidazolate framework-67) wrapped Ag nanowires core-shell nanostructures, and support it on graphene matrix (Co 3 O 4 @Ag NWs-GR) to prepare enzymeless glucose sensor. The core-shell Co 3 O 4 @Ag nanowires possess porous surface and the proposed Co 3 O 4 @Ag NWs-GR nanocomposites exhibit hierarchical structure which could help to improve the performance of enzyme-free glucose detection. For practical application, the as-prepared Co 3 O 4 @Ag NWs-GR nanocomposites were sandwiched by nickel foam (NF) to develop a glucose detection electrode, which demonstrates good reproducibility and glucose specific selectivity. Then, the Co 3 O 4 @Ag NWs-GR/NF electrode was integrated with Pt wire, Ag/AgCl wire and polydimethylsiloxane (PDMS) to fabricate a sensitive device. The amperometric response of the as-developed device suggests that the Co 3 O 4 @Ag NWs-GR/NF based sensor presents a high sensitivity of 2.49 μA/μM/cm 2 in the linear interval of 3–2000 μM, a detection limit of 0.98 μM, as well as an outstanding long-term stability. Additionally, the human serum was used to verify that the Co 3 O 4 @Ag NWs-GR based glucose sensor can detect the glucose level in serum, suggesting it is applicable to the enzymeless glucose determination.
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Science China-Materials
·
2024
·
IF 6.8
He Xun,Xie Ting,Dong Kai,Nan Jue,Sun Hang,Yao Yongchao,Fan Xiaoya,Zheng Dongdong,Luo Yongsong,Sun Shengjun,Liu Qian,Li Luming,Chu Wei,Xie Lisi,Kong Qingquan,Sun Xuping
Electrocatalytic reduction of nitrate (NO 3 − ) can efficiently transform NO 3 − into ammonia (NH 3 ), enabling the simultaneous removal of NO 3 − pollutant from wastewater and the production of NH 3 . Here, we report the use of rare-earth lanthanum-doped Co 3 O 4 nanowires array on carbon cloth (La-Co 3 O 4 /CC) as an efficient electrocatalyst for the conversion of NO 3 − to NH 3 . The as-synthesized La-Co 3 O 4 /CC demonstrates a remarkable NH 3 Faradaic efficiency (96.36%) and NH 3 yield (537.44 µmol h −1 cm −2 ), markedly surpassing its Co 3 O 4 counterpart (87.78%, 279.4 µmol h −1 cm −2 ). Theoretical computations unveil that the incorporation of La doping promotes NO 3 − adsorption and optimizes the hydrogenation process, thus enhancing the electroreduction activity of Co 3 O 4 in NO 3 − conversion and NH 3 selectivity. Furthermore, a Zn–NO 3 − battery incorporating La-Co 3 O 4 /CC achieved a peak power density of 9.86 mW cm −2 . This work advances the application of Co 3 O 4 -based electrodes in electrocatalysis and highlights the effectiveness of rare earth element doping in NO 3 − reduction reactions.
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ENVIRONMENTAL RESEARCH
·
2025
·
IF 7.7
KeXuan Wu,Jing Cao,Ran Zhang,Yong Pei,Ting Peng,Ge Chen
Co 3 O 4 has exhibited chlorine evolution reaction (CER) activity comparable to that of RuO 2 . However, it is plagued by relatively low catalytic activity and insufficient long-term stability. In the field of cobalt oxide doping, typically, a relatively large quantity of dopants is used to modulate its performance. In contrast, the exploration of doping with trace amounts of elements has been scarce. In this study, small amounts of Sn and Bi were introduced into the Co 3 O 4 electrocatalyst. The impacts of different doping ratios on the morphology and catalytic performance of the catalyst were systematically investigated. Under specific proportion conditions, the co-doping of these two elements with cobalt tetroxide demonstrated a remarkable synergistic effect. Moreover, a mechanism for the improvement of catalyst performance, based on DFT calculations, was proposed. Subsequently, the ammonia-nitrogen degradation capacity and long-term stability of the modified catalyst were evaluated through ammonia-nitrogen degradation experiments. The degradation mechanism was further elucidated using free-radical scavenging experiments.
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
·
IF 6.3
Xuliang Zhang,Miaoyuan Zhang,Sifeng Zhang,Tolkyn S. Baizhumanova,Svetlana A. Tungatarova,Heng Zhang,Changdong Chen,Yongjun Han,Xiangqian Li,Shuang Ma
Developing highly efficient and long-lasting electrocatalysts for the oxygen evolution reaction (OER) in acidic conditions is crucial for advancing proton-exchange membrane water electrolysis (PEMWE) technology. In this work, we present a high-performance OER catalyst by doping the rare-earth element neodymium (Nd) into cobalt oxide (Co 3 O 4 ). The Nd-doped Co 3 O 4 catalyst demonstrates exceptional OER performance, exhibiting an overpotential of merely 304 mV at 10 mA cm −2 in 0.5 M H 2 SO 4 . This performance exceeds that of most non-noble-metal-based catalysts and is comparable to some Ru-based noble-metal catalysts. Furthermore, the catalyst demonstrates excellent long-term stability, maintaining stable performance even after continuous operation in the PEM flow cell for 24 h. Density functional theory (DFT) computations reveal that Nd doping refines the electronic structure of Co 3 O 4 , boosts electrical conductivity, and decreases the energy barriers associated with the formation of crucial OER intermediates. Additionally, the introduction of Nd induces oxygen vacancies and modulates the valence states of cobalt, further enhancing the material's structural stability. This work introduces a novel and effective approach to designing cost-effective, high-performance OER electrocatalysts, providing valuable insights for advancing sustainable energy conversion technologies.
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高影响因子
Materials Today Communications
·
2022
·
IF 3.662
Tao Wen,Yang Feng,Yuqiang Bi,Liang Xu,Changping Guo
In this work, nano Co 3 O 4 /C composite catalyst was in-situ synthesized on sponge by high-temperature calcination , and as a catalyst for the thermal decomposition of AP. SEM, EDS , XRD and BET analyses showed that the prepared samples were evenly distributed and nano-sized Co 3 O 4 /C composites. Moreover, the catalytic effect of the nanocomposite catalyst on the thermal decomposition of AP was studied by DSC and TG. The influence of different factors on the thermal decomposition performance of AP were studied. The results indicated that when the Co 3 O 4 /C composite catalyst content was 5 wt%, the high-temperature decomposition (HTD) peak of AP was reduced from 430.1 to 319.0 ℃ and the activation energy from 237.5 down to 81.1 kJ mol −1 . In addition, the possible catalytic mechanism was also briefly discussed. Therefore, all the results indicated that the 3D porous nano Co 3 O 4 /C composite catalyst demonstrated excellent catalytic performance for the thermal decomposition of AP.
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CRYSTENGCOMM
·
2021
·Vol. 23
·期 29
·5097-5105
·
IF 3.545
Zhenguo Wang,Ke Yu,Rong Huang,Ziqiang Zhu
With the development of the economy, energy shortages and the greenhouse effect gradually become problems facing humanity. Hydrogen energy is clean energy and is expected to become the most vital low-carbon energy in the future. At present, industrial hydrogen production mainly uses precious metals such as Pt. Therefore, it is of great significance to design a low-cost hydrogen evolution catalyst comparable in terms of hydrogen production performance and stability. In this work, porous Co3O4 with a hollow structure was prepared using the MOF template method, and VS2 nanosheets were uniformly attached and grown hydrothermally on it, thereby constructing a unique morphology of TS-Co3O4@VS2. The test results show that the catalyst can achieve a hydrogen evolution overpotential as low as 175.29 mV and a low Tafel slope (57.0 mV dec−1) and can work stably for 500 cycles at a current density of 100 mA cm−2 without noticeable performance degradation. Compared with other similar materials, this material significantly improves the kinetic process of the HER, reduces the reaction energy barrier for hydrogen evolution, and improves the operational stability of the catalyst. We believe that this material can provide a reference for the design of transition metal disulfide catalysts.
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CHINESE JOURNAL OF CHEMICAL ENGINEERING
·
2021
·
IF 3.171
Yingmeng Zhang,Luting Liu,Qingwei Deng,Wanlin Wu,Yongliang Li,Xiangzhong Ren,Peixin Zhang,Lingna Sun
Hybrid CuO-Co 3 O 4 nanosphere building blocks have been embedded between the layered nanosheets of reduced graphene oxides with a three dimensional (3D) hybrid architecture (CuO-Co 3 O 4 -RGO), which are successfully applied as enhanced anodes for lithium-ion batteries (LIBs). The CuO-Co 3 O 4 -RGO sandwiched nanostructures exhibit a reversible capacity of ~847 mA·h·g −1 after 200 cycles’ cycling at 100 mA·g −1 with a capacity retention of 79%. The CuO-Co 3 O 4 -RGO compounds show superior electrochemical properties than the comparative CuO-Co 3 O 4 , Co 3 O 4 and CuO anodes, which may be ascribed to the following reasons: the hybridizing multicomponent can probably give the complementary advantages; the mutual benefit of uniformly distributing nanospheres across the layered RGO nanosheets can avoid the agglomeration of both the RGO nanosheets and the CuO-Co 3 O 4 nanospheres; the 3D storage structure as well as the graphene wrapped composite could enhance the electrical conductivity and reduce volume expansion effect associated with the discharge-charge process.
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JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY
·
2020
·Vol. 20
·期 5
·2705-2712
·
IF 1.134
Luk Hsiang-Ning,Chen Yi-Hsin,Hsieh Chia-Ying,Han Yan Wei,Wu Ren-Jang,Chavali Murthy
A novel sensing material of cobalt oxide-bismuth phosphate (Co3O4–BiPO4) was prepared by the hydrothermal method. Thus prepared sensing material was characterized by X-ray diffraction analysis (XRD) and transmission electron microscopy (TEM). The
sensor was used for the determination of epinephrine by using modified Co3O4–BiPO4 on glassy carbon electrode (GCE). The cyclic voltammetry (CV) and differential pulse voltammetry (DPV) methods showed a wide linear response to a concentration range, from
1.71 to 55.00 μM, and the epinephrine detection limit for this sensing system was found to be 1.334 μM. The Co3O4–BiPO4 electrode has very high selectivity towards the detection of epinephrine supported by an interference test. The
epinephrine sensor seems very advantageous for future clinical health and medical sectors.
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高影响因子
JOURNAL OF POWER SOURCES
·
2025
·
IF 7.9
Xian Yang,Ling Leng,Gaoqun Zhang,Zhanfeng Deng,Jun Cheng
The development of efficient non-precious electrocatalysts for the alkaline hydrogen evolution reaction (HER) is critical for industrial water electrolysis. Herein, an amorphous NiS/crystalline Co 3 O 4 heterostructure (NiS/Co 3 O 4 @CP) is fabricated through a scalable two-step electrodeposition. The heterogeneous interface induces electron transfer from Co 3 O 4 to NiS, creating electron-rich NiS sites for optimized H* adsorption/desorption and high-valence Co 3+ species for accelerated water dissociation. The NiS/Co 3 O 4 @CP catalyst exhibits low overpotential of 60 mV at 10 mA cm −2 in 1 M KOH (25 °C) and maintains durability for 1000 h. Under industrial conditions (80 °C, 6 M KOH), the NiS/Co 3 O 4 @CP also exhibits an overpotential of merely 285 mV at 500 mA cm −2 . In a two-electrode electrolyzer, the NiS/Co 3 O 4 @CP//Ni mesh configuration attains a current density of 500 mA cm −2 at a voltage of merely 1.9 V. This work provides a practical strategy for high-performance HER catalysts.
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2018
·
IF 3.779
Guozhen Liu,Xinguang Yuan,Yanmin Yang,Jianming Tao,Yubin Chi,Lixun Hong,Zhiya Lin,Yingbin Lin,Zhigao Huang
Wreath-like Co 3 O 4 particles consisting of microplates are synthesized by a facile solvothermal method and subsequently surface-modified with TiO 2 ultrathin layer using a low-temperature hydrolysis process. Comparing with pure Co 3 O 4 , Co 3 O 4 @TiO 2 exhibits superior electrochemical performances in terms of reversible capacity, rate capability and cycling stability. Co 3 O 4 @TiO 2 exhibits high reversible capacity of 813.0 mAhg −1 at 500 mAg −1 after 180 cycles while the pristine Co 3 O 4 only has a discharge capacity of 512.5 mAhg −1 . The filling of TiO 2 nanoparticles in porous Co 3 O 4 sheets and the TiO 2 -coating on Co 3 O 4 surface, could effectively suppress large volume expansion of Co 3 O 4 and consequently enhance structural stability during the Li-ion insertion/extraction processes. Analysis from the electrochemical measurements reveals that the improved performances should be attributed to reduced the charge-transfer resistance and enhanced Li-ion diffusion kinetics because of TiO 2 -coating. In addition, the reduced work function induced by TiO 2 -coating is helpful to facilitate electron transfer in composites. Moreover, the built-in electric field resulting from the difference in work function between Co 3 O 4 and TiO 2 , would facilitate electron-transfer and Li-ion migration across heterojunction interfaces.
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MATERIALS CHEMISTRY AND PHYSICS
·
2019
·
IF 2.781
Jianli Tao,Meng Zhang,Xiang Gao,Hao Zhao,Zhenpeng Ren,Donghui Li,Jiaojiao Li,Ruiqin Zhang,Yonggang Liu,Yunpu Zhai
Co 3 O 4 /red phosphorus (Co 3 O 4 /RP) photocatalysts were synthesized via facile hydrothermal and mechanically grinding approach. The catalysts were characterized via XRD , TEM , XPS , N 2 sorption , photoelectro chemical measurements and UV–vis DRS . The results showed that the Co 3 O 4 nanocrystals were assembled on the surface of the RP. The loading of Co 3 O 4 on RP was beneficial to enhance the light absorption compared with pure RP. Under visible light , 94.5% of malachite green (MG) can be photodegraded within 20 min over 10% Co 3 O 4 /RP composite, while only 17.3% and 59.9% of MG can be photodegraded over pure Co 3 O 4 and RP. The reaction rate constant k obtained over 10% Co 3 O 4 /RP heterojunction (0.1464 min −1 ) is approximately 3.2 times that of pure RP (0.0457 min −1 ), and 15.3 times that of bare Co 3 O 4 (0.0096 min −1 ). The cycle experiments showed that the catalyst had high photocatalytic stability. Co 3 O 4 nanocrystals inhibit the photoelectron-hole pair recombination of red phosphorus semiconductor, and exhibit improved visible light absorption . Consequently, the catalytic performance of Co 3 O 4 /RP has been enhanced under visible light .
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ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2021
·Vol. 28
·期 28
·37592-37602
·
IF 4.223
Li Tao,Zhao Jinxian,Quan Yanhong,Luo Dongmou,Miao Chao,Ren Jun
Co 3 O 4 nanorods with diameters of ~0.15 μm and lengths of ~1 μm were prepared using a hydrothermal method via the assembly of microcrystals and tested in the catalytic oxidation of toluene. The catalytic performance of Co 3 O 4 nanorods was improved by the addition of Ag at various concentrations, and the 7% Ag/Co 3 O 4 catalyst achieves a toluene conversion of 90% at 256 °C with a space velocity of 78,000 mL g −1 h −1 , which is much lower than that of the pristine Co 3 O 4 (269 °C). The addition of Ag promoted the activation of the surface oxygen species and the formation of more oxygen vacancies, improving the relative low-temperature reducibility of Co 3 O 4 , which is favorable for toluene oxidation. Moreover, the 7% Ag/Co 3 O 4 catalyst showed an excellent stability for toluene oxidation at 250 and 260 °C for 50 h under the same conditions.
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