Scientific Reports
·
2018
·Vol. 8
·期 1
·1-10
·
IF 4.122
Lin Zhichao,Qiao Xiuwen
Coral reef has a unique dendritic structure with large specific surface area, rich pore structure, so that it can be attached to a large number of zooxanthellae for gas exchange. Coral reef ecosystems are also known as underwater rainforests. Inspired by this biological structure, we designed and fabricated coral-like Co 3 O 4 decorated N-doped carbon particles (Co 3 O 4 /N-CP). The obtained Co 3 O 4 /N-CP-900 catalyst shows efficient ORR electrocatalytic performances in an alkaline medium with a positive onset and half-wave potentials of 0.97 and 0.90 V (vs. RHE), as well as a high diffusion-limited current density (5.50 mA cm −2 ) comparable to that of a Pt/C catalyst (5.15 mA cm −2 ). It also displays better stability and methanol tolerance than commercial Pt/C. In addition, the Co 3 O 4 /N-CP-900 electrode has a high specific capacitance of 316.2 F g −1 in 6 M KOH, as well as good rate capabilities and excellent cycle performance. These results are due to large surface area, narrow pore size distribution, high density electrochemical energy conversion and storage activity centers. This method presented here offers an effective path for the development of high performance multi-functional carbon-based materials for ORR and supercapacitor applications.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Materials Chemistry A
·
2018
·Vol. 6
·期 8
·3730-3737
·
IF 9.931
Tongtong Li,Yongxin Lu,Shuaishuai Zhao,Zhi-Da Gao,Yan-Yan Song
The development of catalysts based on non-precious metals that are able to catalyze both the oxygen reduction and oxygen evolution reactions (ORR/OER) is the key element to promote the practical application of rechargeable metal–air batteries. Here we report a novel concept that layered double hydroxides (LDHs) can be used as a precursor to form bimetals and their oxides simultaneously. Co3O4-doped Co/CoFe nanoparticles integrated with graphitic shells are derived from the thermal decomposition of a CoFe LDH bonded with urea as the carbon precursor. The composite material shows a surprisingly high bifunctional (ORR/OER) catalytic activity. The realized core–shell structure synergistically promotes the ORR performance while cobalt oxide doped on the metal surface boosts the OER performance. In addition, the carbon shell ensures high electrical conductivity and effectively impedes the aggregation and the further oxidation of Co/CoFe nanoparticles. When integrating the catalyst into a rechargeable Zn–air battery, the battery performance shows a higher discharge potential and cycling stability (over 65 h of cycling) and a lower charge plateau compared with a Zn–air battery based on a Pt/C and RuO2 catalyst mixture. This work demonstrates a new efficient air cathode material which could be practically applied to rechargeable metal–air batteries or other fuel cells.
✓ 已验证
产品关联
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2018
·Vol. 42
·期 13
·11117-11123
·
IF 3.201
Jiali Zhang,Fangwei Zhang,Shouwu Guo,Jingyan Zhang
A three-dimensional composite of Co3O4 nanoparticles and nitrogen-doped reduced graphene oxide (3D Co3O4/N-rGO) with a unique 3D porous structure was prepared, and its catalytic activity in lignin model compound oxidation was explored. The 3D Co3O4/N-rGO composite exhibits improved catalytic performance as compared to Co3O4 nanoparticles or 3D N-rGO in the oxidation of lignin model compounds. The higher catalytic activity of the 3D Co3O4/N-rGO composite is attributed to the combination of its porous structural features, large surface area that is provided by the 3D N-rGO matrix, and active Co3O4 nanoparticles doped on the N-rGO surface. The structural features of the 3D Co3O4/N-rGO are beneficial to reactant and product diffusion and transportation, and also are helpful in preventing aggregation of Co3O4 nanoparticles. In addition, the introduction of N atoms in rGO is also favorable for the formation of active oxygen species for the oxidation of model compounds. Given the high activity and the easy recovery from the reaction system, the 3D Co3O4/N-rGO composite should be applicable to non-noble metal catalytic systems for lignin model compounds.
✓ 已验证
产品关联
DOI
高影响因子
SCIENCE OF THE TOTAL ENVIRONMENT
·
2018
·
IF 4.61
Limin Hu,Guangshan Zhang,Meng Liu,Qiao Wang,Shuying Dong,Peng Wang
Nickel foam (NF)-functionalized Co 3 O 4 -Bi 2 O 3 nanoparticles (CBO@NF) synthesized using a facile one-step microwave-assistant method were employed as catalysts to activate peroxymonosulfate (PMS) with bisphenol A (BPA) as the target pollutant. The crystallinity , morphology, and chemical valence state of the synthesized CBO@NF were analyzed using XRD, SEM , and XPS, respectively. Moreover, effects of the preparation parameters, including the calcination temperature and calcination time as well as the loading dosage, were evaluated in detail. A degradation efficiency of 95.6% was achieved within 30 min with the optimal degradation system. The CBO@NF/PMS system shows great catalytic activity in a pH range from 3.0 to 11.0. The stability and reusability of the CBO@NF supported catalyst was evaluated through a recycling experiment. In addition, the possible degradation mechanism was also explored using a quenching experiment and electron paramagnetic resonance (EPR) detection. The result shows that both the surface-bound SO 4 − and OH play significant roles during the degradation process, where the electron transfer of Co 2+ /Co 3+ , Bi 3+ /Bi 5+ , and Ni 2+ /Ni 3+ realizes the sustained regeneration of the active radicals. This work provides new insight for the practical applications of sulfate radical-based advanced oxidation processes (SR-AOPs) in wastewater treatment .
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Applied Materials & Interfaces
·
2018
·
IF 8.097
Guijuan Wei,Zhen Zhou,Xixia Zhao,Weiqing Zhang,Changhua An
Ultrathin metal–organic framework (MOF) nanosheets possessing inherent advantages of both two-dimensional (2D) features and MOFs are attracting intensive research interest. The direct manufacture of MOF nanosheets is still a challenge up to now. Here, we have developed a novel bottom-up approach to synthesize zeolitic imidazolate framework-67 (ZIF-67) nanosheets, which can be in situ converted into Co3O4 ultrathin nanomeshes after thermal treatment. Interestingly, the obtained Co3O4 nanomeshes are rich in oxygen defects, providing fruitful active sites for the faradaic reaction. The modified electrode exhibits a large specific capacitance (1216.4 F g–1 at 1 A g–1), as well as a high rate capability (925.5 F g–1 at 20 A g–1). Moreover, an asymmetric supercapacitor made of Co3O4//activated carbon shows an energy density of 46.5 Wh kg–1 at 790.7 W kg–1. Furthermore, the 2D Co3O4 ultrathin nanomeshes show an outstanding performance for the oxygen evolution reaction with an overpotential of 230 mV at the onset potential and a small Tafel slope of 74.0 mV dec–1. The present method presents a facile avenue to the preparation of other 2D ultrathin metal oxide nanostructures with various applications in energy catalysis and conversion.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SURFACE & COATINGS TECHNOLOGY
·
2018
·
IF 2.906
Jiaoyuan Zhang,Rongrong Chen,Jingyuan Liu,Qi Liu,Jing Yu,Hongsen Zhang,Xiaoyan Jing,Milin Zhang,Jun Wang
In this work, superhydrophobic and superoleophilic nickel foam loaded with ZnO@Co 3 O 4 hierarchical structure was successfully fabricated via a simplified one-pot hydrothermal method , followed by a brief calcination process and, finally, superhydrophobically modification with hexadecyltrimethoxysilan (HDTMS). The as-prepared nickel foam showed excellent abrasion resistance , chemical stability and high oil-water separation efficiency. The chemical composition and morphologies were characterized by means of Fourier transform infrared spectroscopy (FT-IR), X-ray diffraction analysis (XRD) and scanning electron microscopy (SEM). The sample we have manufactured proves to be a potential material for the separation of oil-water mixtures.
✓ 已验证
产品关联
DOI
高影响因子
ANALYST
·
2018
·Vol. 143
·期 20
·5030-5037
·
IF 3.864
Qiong Wu,Fengxia Zhang,Huijuan Li,Zhihua Li,Qi Kang,Dazhong Shen
Herein, we report a ratiometric photoelectrochemical (PEC) immunosensor coupled with secondary antibodies–Co3O4 nanoparticle conjugates (Ab2–Co3O4 NPs) for signal amplification. The Ab1-g-C3N4@TiO2 NTs and BSA-g-C3N4@TiO2 NTs act as the sensing and reference photoelectrodes, where Ab1, BSA and TiO2 NTs are the capture antibodies, bovine serum albumin and TiO2 nanotube arrays, respectively. In the presence of target Ag, the sensing PEC photocurrent decreases due to the steric hindrance of Ab1 molecules, which increases the inner resistance of the photoelectrode. The signal-off response is enhanced further using Ab2–Co3O4 NP conjugates due to their steric hindrance effect and the consumption of electron donors by the Co3O4 NPs. Furthermore, the performance of the ratiometric PEC platform is tested using alpha-fetoprotein (AFP) as a model antigen. Under the optimal conditions, the concentration of AFP is detected in the range of 0.4 pg mL−1 to 40 ng mL−1 with a detection limit of 0.2 pg mL−1. This ratiometric strategy is beneficial to improve the reliability and anti-interference ability of PEC immunosensors.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ANALYTICA CHIMICA ACTA
·
2018
·
IF 5.123
Yuting Zhang,Dongmei Deng,Xiaoli Zhu,Shuai Liu,Yan Zhu,Long Han,Liqiang Luo
Bimetallic Au-Ag/Co 3 O 4 nanofibers (Au-Ag/Co 3 O 4 NFs) were synthesized by an electrospinning method and calcination treatment. Due to the admirable synergic effect of electrocatalytic ability of Au and Ag, and the large surface-to-volume ratio of Co 3 O 4 nanofibers caused by their rough surface, the synthesized Au-Ag/Co 3 O 4 NFs were applied to a sensing platform for hydrogen peroxide oxidation . Using electrochemical techniques, the novel sensing platform based on Au-Ag/Co 3 O 4 NFs shows a wide linear concentration range with high detection sensitivity of 1241.1 μA mM −1 cm −2 . This sensitive sensor was also applied to determine H 2 O 2 from human breast cancer cells, indicating its great potential application in physiology and pathology.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2017
·Vol. 25
·期 5
·4656-4666
·
IF 2.741
Hu Limin,Zhang Guangshan,Liu Meng,Wang Qiao,Wang Peng
In this work, Co 3 O 4 -Bi 2 O 3 was successfully synthesized using a microwave-assisted method [Co 3 O 4 -Bi 2 O 3 (MW)] and employed as a peroxymonosulfate (PMS) activator for bisphenol A removal. A reference catalyst was prepared using the same preparation conditions but different heating mode and labeled as Co 3 O 4 -Bi 2 O 3 (CH). The series of Co 3 O 4 -Bi 2 O 3 was characterized using XRD, SEM, and N 2 adsorption to detect their crystallinity, morphology, and surface area, among others. Results indicated that both microwave and calcination significantly affected the characteristic and catalytic activity of the catalyst. Moreover, the microwave-irradiated catalyst calcined at 300 °C showed higher catalytic activity and mineralization percentage for BPA degradation than the conventionally heated catalyst calcined at the same temperature. Microwave temperature and microwave time of the proposed microwave-assisted method were also investigated. Compared with other catalysts, the present catalyst showed considerably superior preparation time and degradation efficiency. This study broadens a new horizon for advanced oxidation process using a PMS activator.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SYNTHETIC METALS
·
2017
·
IF 2.435
Binghu Wang,Wensheng Tan,Renjun Fu,Huihui Mao,Yong Kong,Yong Qin,Yongxin Tao
Hierarchical mesoporous Co 3 O 4 /C@MoS 2 core-shell structured materials are synthesized via a two-step calcination and a solvothermal method using cobalt metal-organic frameworks (cobalt-MOFs, ZIF-67) and (NH 4 ) 2 MoS 4 as the precursors of Co 3 O 4 /C and MoS 2 , respectively, which is a new class of core-shell materials as supercapacitor electrode materials. The obtained Co 3 O 4 /C@MoS 2 exhibits high specific capacitance (1076 F g −1 at 1 A g −1 ), rate capability (76.9% capacitance retention at 10 A g −1 ) and cyclic stability (64.5% capacitance retention after 5000 cycles at 10 A g −1 ). Moreover, the content of MoS 2 greatly influences the electrochemical performances of the obtained core-shell materials. The results demonstrate that the as-synthesized ZIF-67 can be used as a promising candidate for designing Co 3 O 4 based core-shell materials used in supercapacitors.
✓ 已验证
产品关联
DOI
高影响因子
Journal of the Taiwan Institute of Chemical Engineers
·
2017
·
IF 4.217
Qun-Zeng Huang,Ji-Chao Wang,Li-Qun Ye,Qian Zhang,Hong-Chang Yao,Zhong-Jun Li
The construction of p–n heterojunction is an efficient strategy to restrain photogenerated charge carriers recombination and enhance the photocatalytic efficiency toward H 2 evolution from water splitting. Herein a novel p–n heterojunction Mn 0.25 Cd 0.75 S/Co 3 O 4 was synthesized via facile hydrothermal method. Photocatalytic H 2 evolution of as-synthesized Mn 0.25 Cd 0.75 S/Co 3 O 4 composites in the absence of noble metal co-catalysts under visible light irradiation ( λ ≥ 400 nm) was investigated. The results demonstrated that photocatalytic H 2 evolution of Mn 0.25 Cd 0.75 S was significantly enhanced by loading Co 3 O 4 nanoparticles . It was confirmed that 0.48 wt% of Co 3 O 4 loading content achieved the highest H 2 evolution rate of 25.71 mmol/g/h, which was about 5.35 times higher than that of pure Mn 0.25 Cd 0.75 S. The remarkably improved photocatalytic activity could be attributed to the formation of the p–n junction at the interface between Mn 0.25 Cd 0.75 S and Co 3 O 4 , effectively promoting interfacial charge transfer and separation. This work revealed that the p–n heterojunction Mn 0.25 Cd 0.75 S/Co 3 O 4 may be a promising candidate for efficient energy conversion.
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry A
·
2024
·Vol. 12
·期 28
·17463-17470
·
IF 10.7
Shiqiang Sun,Guoling Li,Shanhui Zhu,Wenhao Meng,Leilei Xu,Jinlong Jiang,Fagen Wang,Xingyun Li
Precise defect engineering of metal oxide catalysts holds great importance for improving catalytic oxidation reactions. In this work, a judicious strategy by doping and partially de-doping of Cr atoms was orchestrated to produce a defect-containing Co3O4 catalyst. The co-existence of the remaining Cr dopant and some metal vacancies could synergistically contribute to the distortion of the crystal structure, Co–O bond activation, generation of abundant active oxygen species and enhancement of oxygen reactivity. Consequently, the catalytic performance for the methane oxidation reaction was significantly boosted, with a methane conversion rate normalized by the specific surface area of 0.114 μmol m−2 s−1, 1.41 times that of the pure Co3O4 catalyst at a reaction temperature of 295 °C. This work provides a viable methodology for improving Co3O4 catalysts for efficient methane oxidation.
✓ 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）