RSC Advances
·
2016
·Vol. 6
·期 94
·91791-91797
·
IF 3.289
Jia-yi Pu,Jin-quan Wan,Yan Wang,Yong-wen Ma
In this study, Co-based MOF with a 2D structure, 3D microrod structure and 3D nano-dodecahedral structure was synthesized by the coordination of cobalt ions and different organic ligands. Then, Co3O4, which was derived from these Co-based MOFs, was used to activate oxone for RhB degradation. It was found that the morphology and structure of the templates can significantly influence the formation of the nano Co3O4 products, which has an indirect effect on the catalytic ability of the resulting Co3O4 for oxone to degrade RhB. Among the products, nano-sphere Co3O4, which was derived from a template with a 3D nano-dodecahedral structure (ZIF-67) can effectively activate oxone to degrade RhB. Under neutral conditions, the rate constant of the degradation of RhB (0.1 mM) was 0.0509 min−1 with 50 mg L−1 catalyst and 1.0 mM oxone based on first-order kinetics. In addition, the influence of a series of parameter factors (pH, the dosage of catalyst and oxone) on the catalyst was also studied. Low cobalt ion dissolution (0.04 mg L−1 at pH = 3, <0.01 mg L−1 at pH = 7) and good recyclability (degradation rate of RhB after 5 cycles: close to 96%, 89% at pH = 7, pH = 3) further proved that the as-prepared Co3O4 can be used as a promising catalyst.
研究领域:
环境化学
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材料科学
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催化化学
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纳米技术
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环境污染治理
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DOI
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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产品关联
DOI
高影响因子
Journal of Energy Storage
·
2024
·
IF 8.9
Xiling Mao,Hao Liu,Jianhua Xu,Mengwei Li,Wenyao Yang
The rational surface reconstruction of component heterointerfaces is an effective strategy for boosting the electrochemical activity and structural stability of asymmetric supercapacitors. In this study, a Co 3 O 4 /rGO (cobalt oxide/reduced graphene oxide(rGO)) heterostructure was designed using a hydrothermal and annealing strategy. Owing to its abundant electroactive sites, accelerated diffusion reaction kinetics, and strong OH − adsorption capability, the optimized Co 3 O 4 /rGO composite delivered an ultrahigh capacitance of 273.3 F/g at 1 A/g. Additionally, density functional theory (DFT) calculations verified the significant charge transfer from Co 3 O 4 to rGO near the heterointerface, achieving obvious charge redistribution and the formation of a space-charge layer. This optimization enhances significantly optimizes OH − adsorption and diffusion and improves electrical conductivity, leading to the excellent electrochemical performance of the surface-reconstructed Co 3 O 4 /rGO. More importantly, the all-solid-state asymmetric supercapacitor Co 3 O 4 /rGO//AC (activated carbon) demonstrated an exceptional energy density of 16.47 Wh/kg at a power density of 599 W/kg, along with excellent cycling stability, retaining 91.0 % capacitance after 5000 cycles. Overall, this study provides an effective approach for designing surface-reconstructed heterointerfaces to achieve remarkable electrochemical performance and ensure structural integrity, showcasing significant potential for practical applications in the energy storage market.
研究领域:
材料科学
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电化学
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能源存储
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DOI
高影响因子
Surfaces and Interfaces
·
2022
·
IF 6.137
Jinhao Gao,Wenqiang Chen,Huaqiang Shi,Zhijian Li,Liming Jing,Chen Hou,Jianzhi Wang,Yang Wang
Co 3 O 4 @Fe 3 O 4 /cellulose membrane was synthesized by coating rod-like MOF-derived Fe 3 O 4 with Co 3 O 4 nanoparticles and blending with cellulose solution, further applied in the visible light-driven photo-Fenton system for perfluorooctanoic acid (PFOA) degradation. In the H 2 O 2 /membrane/visible light system, the Electron paramagnetic resonance (EPR) analysis and scavenger experiment results suggested that PFOA degradation was a co-dependent mechanism via photogenerated electrons, photogenerated holes ( h + ) and various radical species, rather than a single active constituent. Co 3 O 4 @Fe 3 O 4 /cellulose membrane showed outstanding degradation performance, stability and recyclability under optimal conditions. Compared with pure Fe 3 O 4 or Co 3 O 4 nanoparticles , the Co 3 O 4 @Fe 3 O 4 /cellulose membrane can degrade around 94.5% PFOA within 180 min in reaction system, and the leached Fe and Co was only 0.05 and 0.49 ppm, respectively. Moreover, Co 3 O 4 @Fe 3 O 4 /cellulose was reused by rinsing with ultra-pure water and the degradation capacity was still 80.4% after five cycles. The degradation pathway of PFOA also was proposed based on UHPLC-MS analysis.
研究领域:
环境科学
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材料科学
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DOI
高影响因子
Frontiers in Materials
·
2022
·
IF 3.985
Yang Jiangping,Zhang Zhe,Sun Siyuan,Wang Cheng
The development of transition metal oxides (TMOs) as electrocatalysts for oxygen evolution reaction (OER) has the potential to surpass the performance of noble-metal-based catalysts. In this work, a quenching rapidly strategy was used to synthesize Mo-modified Co3O4 nanosheet arrays as advanced catalysts. The resulting Mo-Co3O4 electrodes showed superior activity and reaction kinetics, with an overpotential of only 341 mV to drive a current density of 100 mA cm−2 and a Tafel slope of 69.0 mV dec−1. This improved performance is thought to be due to the formation of high-valence Co sites, which creates a synergistic effect. The ability to regulate the synthesis without causing obvious agglomeration and nucleation growth during annealing makes this method a promising approach for the design of other advanced functional materials.
研究领域:
材料科学
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电化学
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纳米技术
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DOI
高影响因子
NANOTECHNOLOGY
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2021
·Vol. 32
·期 34
·345702
·
IF 3.874
Yuqiang Zhang,Yan Wang,Jiahui Zhu,Xubin Zhang,Wangfeng Cai
A flower-like structured electrode material of Co3O4@Ni–Co layered double hydroxide (LDH) grown on Ni foam (Co3O4@Ni–Co LDH/NF) was prepared via an in situ growth, annealing and electrodeposition process. The Co3O4@Ni–Co LDH/NF electrode was prepared with the optimized conditions of annealing temperature 300 °C, deposition time 20 min and Ni/Co ratio 1:1. The results showed that the as-prepared electrode material exhibited an excellent specific capacitance and great cycling stability. Furthermore, an quasi-solid-state supercapacitor was assembled using the prepared Co3O4@Ni–Co LDH/NF as the positive electrode and activated carbon on Ni foam (AC/NF) as the negative electrode. The as-assembled device presented a high energy density and power density.
研究领域:
材料科学
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电化学
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DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
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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.
研究领域:
环境科学
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分析化学
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DOI
PubMed
高影响因子
APPLIED CATALYSIS A-GENERAL
·
2021
·
IF 5.706
Mingyang Tan,Liang Zhu,Hao Liu,Yajun Fu,Shuang-Feng Yin,Weijun Yang
A Cobalt porphyrin conjugated porous polymer (Co/PCP) was obtained by hybrid polymerization of a mixture of Co(II)(5,10,15,20-tetrakis(4-bromophenyl)-21H,23H-porphyrin) (CoTBPP) and 5,10,15,20-tetrakis(4-bromophenyl)-21H,23H-porphyrin (TBPP) (3:7 M ratio) with the coupling reagent of p-phenyldiboric acid. This Co/PCP was carbonized at 400 °C and the obtained catalyst (denoted as Co 3 O 4 @PNC-400) was composed of Co 3 O 4 nanoclusters wrapped in the nitrogen-carbon materials. This catalyst has an extremely high catalytic activity for the aerobic oxidation of C–H bonds. It can efficiently catalyze the oxidation of the C–H bonds in toluene and cyclohexane with high conversion and high selectivity of (alcohol + aldehyde), (alcohol + ketone) compounds, respectively. When heat-treated at 400 °C, the porous framework structure of the porphyrin polymer was partially retained, and the highly active Co 3 O 4 nanoclusters were generated in situ. The reaction of C N to C N and connection with the Co 3 O 4 nanoclusters also occurred. Co 3 O 4 @PNC-400 has obvious synergistic catalytic effect between Co 3 O 4 and nitrogen-carbon framework during the catalytic reaction. The defective structure caused by the migration of cobalt also greatly improved the catalytic activity. Co/PCPs with different cobalt contents were also synthesized and heat treated at different temperature. These catalysts were a new type of efficient C–H oxidation catalysts with excellent potential application value.
研究领域:
材料科学
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催化
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化学工程
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有机化学
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DOI
高影响因子
CHEMOSPHERE
·
2018
·
IF 4.427
Ruixia Yuan,Lin Hu,Peng Yu,Zhaohui Wang,Huaiyuan Wang,Jingyun Fang
3D porous Co 3 O 4 /nitrogen-doped graphene aerogel (NGA) hybrid for heterogeneous activation of peroxymonosulfate (PMS) was prepared by feasible hydrothermal and freeze-drying methods. The morphology, crystal structure and chemical composition of the catalyst were investigated by scanning electron microscopy, X-ray diffractometer , X-ray photoelectron spectroscopy, Raman spectra and Fourier transform infrared spectroscopy . Co 3 O 4 /NGA at a high N doping level of 7.6% (in atomic percentage) exhibited excellent catalytic performance for acid orange 7 (AO7) degradation, with almost complete removal within 30 min. Moderate PMS content, higher temperature and lower solution pH conditions would facilitate the decomposition of AO7. The catalyst possesses excellent long-term stability and recycling performance with simple separation and post-treatment approaches. Kinetic model was developed to simulate the transformation of main active radical species and the AO7 oxidation profiles, considering effects of coexisting ions (Cl − and HCO 3 − ). Based on results of electron spin resonance, typical quenching tests and kinetic calculation, sulfate radicals play dominate role in AO7 degradation. Co 3 O 4 nanocrystals and the new active sites created by nitrogen doping into graphene honeycomb network should synergistically contribute to the high degradation efficiency. This work has expanded the possibility of recyclable catalysts design for heterogeneous activation of PMS, with a dual catalytically active center and desirable stability.
研究领域:
环境科学
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材料科学
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催化化学
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DOI
高影响因子
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.
研究领域:
环境科学
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材料科学
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催化化学
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DOI
高影响因子
DALTON TRANSACTIONS
·
2017
·Vol. 46
·期 45
·15947-15953
·
IF 4.029
Ming Zhong,Dong-Hui Yang,Ling-Jun Kong,Wei Shuang,Ying-Hui Zhang,Xian-He Bu
Developing high-performance electrode materials to replace a traditional graphite electrode is critical for the commercialization of lithium ion batteries, which however still remains a great challenge. Herein, we report a suitable method to synthesize a series of well-dispersed nanostructured Co3O4–CoFe2O4 composites (CCFs) from bimetallic metal–organic frameworks (BiMOFs) with varied Fe3+/Co2+ molar ratios. When used as anodes for lithium ion batteries, the CCF-12 composite exhibits a maximum initial discharge capacity of 1328 mA h g−1, a reversible capacity of 940 mA h g−1 at 100 mA g−1 after 80 cycles, and a better rate capability in comparison with those of pure Co3O4 and other CCF composites. The well-dispersed structure and small particle size are believed to mainly contribute to the outstanding electrochemical performance of CCF-12 electrodes.
研究领域:
材料科学
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电化学
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纳米科技
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能源存储
·
无机化学
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DOI
高影响因子
CATALYSIS LETTERS
·
2022
·Vol. 153
·期 3
·779-789
·
IF 2.936
Guo Guangkai,Zhong Dazhong,Zhao Tao,Liu Guang,Li Jinping,Zhao Qiang
It is important to develop active, stable, and cost-effective electrocatalysts for highly efficient overall water splitting. Metal organic frameworks were considered as efficient precursors for overall water splitting catalysts. In this paper, NC/Ni–Co 3 O 4 @Co 1−x S with small size is obtained from ZIF-67. NC/Ni–Co 3 O 4 @Co 1−x S materials exhibit superior overall water splitting properties, with a low overpotential of 170 mV for the hydrogen evolution reaction at 10 mA cm −2 and 210 mV for the oxygen evolution reaction at 10 mA cm −2 and long-term stability. Furthermore, the overall water splitting only requires 1.64 V to drive the current density of 10 mA cm −2 , when the NC/ Ni–Co 3 O 4 @Co 1−x S are used as both anode and cathode. NC/Ni–Co 3 O 4 @Co 1−x S has excellent electrocatalytic activity due to its nanosheet structure, which greatly increases the electrochemically active surface area and the NC/Ni–Co 3 O 4 @Co 1−x S has good electrical conductivity and abundant Co 3+ sites, so the electrocatalytic activity is significantly enhanced. This study provides a new idea for the design and synthesis of novel composite electrocatalysts. Graphical
研究领域:
材料科学
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电化学
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能量转换
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纳米技术
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催化
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）