International Journal of Electrochemical Science
·
2023
·Vol. 12
·期 4
·2618-2627
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IF 1.5
Gongrui Wang,Yanshuang Meng,Lei Wang,Jun Xia,Fuliang Zhu,Yue Zhang
A novel yolk-shell structured Co 3 O 4 -CoO/Carbon (Co 3 O 4 -CoO/C) composite was prepared and applied as cathode active materials in lithium ion batteries. The composites were prepared through a facile copolymerization of ionic liquid and acrylonitrile, which were used as carbon sources, followed by carbonization. The yolk-shell structure of the composite endows the electrodes with excellent cycling performance due to improved electronic conductivity, reduced strain and depressed aggregation of active materials compared with bare Co 3 O 4 . Thus, the Co 3 O 4 -CoO/C composite showed a high reversible capacity and cycling life of 590 mAh·g -1 after 50 charge/discharge cycles at a current rate of 890 mAh·g -1 .
研究领域:
材料科学
·
电化学
·
储能
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DOI
高影响因子
JOURNAL OF SOLID STATE ELECTROCHEMISTRY
·
2020
·Vol. 24
·期 4
·941-950
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IF 2.646
Yang Pan,Li Wenjuan,Lian Yijun,Yu Feng,Dai Bin,Guo Xuhong,Liu Zhiyong,Peng Banghua
Photoelectrocatalytic (PEC) water splitting technology is used to convert solar energy into hydrogen energy, and has the potential to alleviate energy crisis problem. TiO 2 nanowire arrays (NAs), as a promising PEC photoanode, have the advantages of low cost and stable mechanical properties. However, due to its wide energy band, poor conductivity, and slow carrier transfer kinetics, modifying TiO 2 NAs with metal is a feasible way to achieve high PEC performance, especially cobalt-based compounds. Different from the fussy and polluted synthesizing methods, here, we use a facile method to successfully load Co 3 O 4 and CoO mixtures on TiO 2 NAs. A series of characterization methods are conducted to study the morphology, structure, and PEC water oxidation performance. It is found that the photocurrent density of the obtained CoO-Co 3 O 4 /TiO 2 photoelectrode is enhanced and good stability can be kept up for 13 h or more. The prominent reason for enhanced PEC performance of CoO-Co 3 O 4 /TiO 2 NAs is that loading CoO and Co 3 O 4 can increase the light absorption, reduce the charge transfer resistance, and improve the charge separation efficiency of TiO 2 NAs. Our work introduces an alternative designing way to load both of CoO and Co 3 O 4 on photoelectrode in a particularly eco-benign way, which provides efficient and stable cobalt-based TiO 2 photoanodes, and it can be applied to wider research fields, such as solar cells and photo-responsive devices.
CoO x /TiO 2 NAs were synthesized via a facile approach. Because of accelerated charge transfer kinetics and enlarged light absorption capability, it exhibits superior PEC water oxidation and higher stability performance.
研究领域:
材料科学
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能源科学
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产品关联
DOI
高影响因子
METALLURGICAL AND MATERIALS TRANSACTIONS B-PROCESS METALLURGY AND MATERIALS PROCESSING SCIENCE
·
2020
·Vol. 51
·期 4
·1339-1343
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IF 2.035
Ren Guoxing,Xiao Songwen,Liao Caibin,Xia Longgong,Liu Zhihong
The activity coefficient of CoO in SiO 2 -saturated MnO-SiO 2 slag was measured using metal-slag-gas equilibrium experiments under controlled oxygen potentials (10 −12 to 10 −10 atm) at 1623 K. The solubility of CoO in the slag increased with increasing oxygen potential and cobalt content in the alloy. The activity coefficient of cobalt oxide, γ CoO , referred to solid CoO, can be described as: γ CoO = 1.65 − 0.14 (wt pct CoO), where (wt pct CoO) represents the mass percent of CoO in the slag.
研究领域:
冶金学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2021
·
IF 6.901
Katam Srinivas,Yuanfu Chen,Zhe Su,Bo Yu,Marimuthu Karpuraranjith,Fei Ma,Xinqiang Wang,Wanli Zhang,Dongxu Yang
Development of inexpensive and highly efficient bifunctional electrocatalysts for overall water-splitting is of great significance to produce sustainable hydrogen fuel from a renewable water source. Particularly, the sluggish oxygen evolution reaction kinetics limit the overall efficiency of water-splitting catalysis. Although, precious metal-based catalysts can reduce the energy barrier and drive the reaction at low overpotentials, their scarcity and high cost limit the commercialization. In order to address the aforementioned issues, we present a metal-organic framework (MOF)-derived CoFe 2 O 4 /CoO heterostructure-embedded carbon nanotubes (CNT)-network with exceptional water-splitting performance. Due to the collective advantages related to MOF-derived porous carbon with abundant oxygen-vacancies, CoFe 2 O 4 /CoO heterostructure-embedded CNT-networks with largely exposed catalytic sites, and their synergistic interactions, the hybrid catalyst (CoFe/C-650) delivers superior performance for oxygen evolution reaction (OER), hydrogen evolution reaction (HER), and overall water-splitting: it requires a low overpotential of 246 mV (for OER) and 164 mV (for HER) at 10 mA/cm 2 ( ƞ 10 ) with low Tafel slopes of 45.27 and 86.38 mV/dec, respectively. Interestingly, it requires an overpotential of 1.614 V ( ƞ 10 ) for full water-splitting catalysis, which is comparable to that of benchmark Pt/C (Cathode) and RuO 2 (Anode) combination. This work presents a novel approach towards nanostructure design and facile production of transition metal-based oxide heterostructures to achieve the superior bifunctional activity.
研究领域:
材料科学
·
能源化学
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产品关联
DOI
高影响因子
Catalysis Science & Technology
·
2019
·Vol. 9
·期 24
·6957-6964
·
IF 5.726
Weiyang Jin,Xiaoliang Guo,Jun Zhang,Lekai Zheng,Fang Liu,Yongchuan Hu,Jing Mao,Hui Liu,Yanming Xue,Chengchun Tang
Designing and developing a cost-effective and highly stable hydrogen evolution reaction (HER) electrocatalyst under alkaline conditions is critical for sustainable energy conversion and storage. Cobalt-based oxides have been considered as ideal HER electrocatalysts and have been intensively studied; however, their catalytic activity is still unsatisfactory. The modulation of electrical conductivity, which limits the catalytic activity of the transition metal cobalt-based oxides, is an effective way to improve the electron transfer efficiency, mass transfer and kinetic process of the HER. Herein, an ultrathin carbon layer coated cobalt(II) oxide nanosheet array grown in situ on carbon cloth was synthesized by a simple two-step method for efficient HER. The obtained interconnected C@CoO nanosheet array possesses lower overpotentials and smaller Tafel slopes than those of bare CoO and shows excellent stability in 20 h long-term stability tests. The ultrathin carbon coated structure provides CoO with enhanced electron transfer efficiency, increased number of active sites and strong structural stability. This work paves an interesting route for boosting the HER performance of oxide-based electrocatalysts through introducing an ultrathin carbon coating for various energy systems in the future.
研究领域:
材料科学
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能源化学
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产品关联
DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
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2017
·
IF 9.446
Zheng Wan,Qian Xu,Hui Li,Yi Zhang,Yong Ding,Jide Wang
This paper introduces the first attempt of using well organized Co@CoO core-shell nanocrystals as an alternative toward noble metal catalysts for photocatalytic water splitting reactions. In this work, four kinds of stable magnetic Co@CoO core-shell nanocrystals were fabricated through a one-pot toluene-water two-phase interfacial reaction with oleic acid as a surfactant. The size and shape of the as-prepared crystals can be carefully adjusted through dynamically coating the closely packed monolayer of coordinating ligand onto the growing crystals. It is notable that spherical pine-nut-like hierarchical assemblies of Co@CoO core-shell nanoplates exhibit excellent photocatalytic activity (the maximum value of O 2 yield is over 96%). Even after the sixth run, the high catalytic activity of the recovered Co@CoO core-shell nanoplates remained.
研究领域:
材料科学
·
催化化学
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产品关联
DOI
高影响因子
ACS Applied Nano Materials
·
2022
·
IF 6.14
Qiong Zhang,Dewen Xu,Yunfa Si,Renxin Xu,Bailu Luo,Shuangyuan He,Dan Liu
As a recently emerging 2D material, Ti3C2TX MXene, with some distinct characters, might bring opportunities for developing advanced microwave absorption materials (MAMs). Although the multilayered MXene with an accordion-like structure has been used as the building blocks to obtain composite MAMs, the exfoliated MXene (eMXene) nanosheets have rarely been explored. Herein, we construct a hierarchically structured MXene-based composite by simultaneously decorating magnetic nanosheets/particles onto eMXene sheets for an efficient microwave absorption. Systematic ex situ characterizations reveal that the eMXene sheets can act as a structure-directing agent and host to allow an interlaced growth of ultrathin CoO nanosheets and spherical Co@C nanoparticles onto their surfaces. Such structural design impedes the agglomeration of eMXene sheets and magnetic nanounits while guaranteeing the adequate exposure of polar functional groups on MXene surfaces. Meanwhile, the introduction of dual magnetic phases enables an additional magnetic loss capability and also builds massive void spaces and rich heterointerfaces between various nanounits for a significantly enhanced dielectric polarization loss, resulting in a superior impedance matching and attenuation capability. Accordingly, the optimal composite exhibits a minimum reflection loss of −73.4 dB at a thin thickness of 2.1 mm and an effective absorption bandwidth up to 5.6 GHz (12.4–18.0 GHz) at a thin thickness of 1.8 mm. This study might stimulate the further development of exfoliated MXene-based composite microwave absorbers with hierarchical structures.
研究领域:
材料科学
·
电磁学
·
纳米技术
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产品关联
DOI
高影响因子
ENERGY & FUELS
·
2023
·
IF 5.3
Peng Wang,Zinan Wang,Ximin Zhang,Yongli Liao,Wei Duan,Ying Yue,Yuning Zhang
Flexible supercapacitors have attracted widespread attention due to the rapid development of wearable electronics. Nevertheless, most supercapacitors will degrade after being stretched and cannot work underwater. Here, a new kind of stretchable superhydrophobic supercapacitor was proposed. On the basis of the freeze–thaw treatment of PVA hydrogel, carrageenan and carbon nanotubes (CNTs) were further introduced to construct a triple network hydrogel that achieved self-healing, high elasticity, and stretchability simultaneously. Then, hydrophobic modified CNTs and NiO/CoO nanoparticles were sprayed onto the surface of the hydrogel to construct electrodes. The energy storage performance was improved by combining pseudocapacitive (CoO and NiO) and electric double-layer capacitive (MWCNT) behaviors. The superhydrophobic supercapacitor has excellent flexibility, self-healing, and self-cleaning properties. Furthermore, it can maintain superhydrophobic and good energy storage performance even after being stretched 400%, abraded 65 cycles, and cut 20 times. Owing to superhydrophobicity, this supercapacitor would have a bright application for underwater workings.
研究领域:
材料科学
·
能源技术
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF POWER SOURCES
·
2025
·
IF 7.9
Xin Miao,Yunxin Shi,Liying Wang,Zhenzhu Cao,Yongfeng Zhang,Shaohua Luo
Hollow Co/CoO@NSCO nanospheres were synthesized via solvothermal derivation from dual-ligand Co-MOF, followed by controlled calcination. The calcination-temperature-mediated tuning of Co/CoO ratios and oxygen vacancy concentrations significantly enhanced lithium storage performance. Optimized Co-450 (450 °C calcination) delivered exceptional reversible capacities of 1112.5 mAh g −1 at 0.2 A g −1 after 100 cycles and 605.6 mAh g −1 at 1 A g −1 after 1000 cycles. Ex situ XRD confirmed metallic Co's role as an electrochemically inactive conductive matrix, while oxygen vacancies (65.7 % by XPS) facilitated rapid Li + diffusion. Kinetic analysis revealed hybrid charge storage: capacitive effects (68 % contribution at 1 mV s −1 ) dominated by pseudocapacitance from Co 2+ /Co 3+ redox couples, complemented by diffusion-controlled processes. The hierarchical hollow structure accommodated volume changes, and heteroatom-doped carbon enhanced electronic conductivity. This work demonstrates calcination-driven phase engineering as a viable strategy for high-performance anodes.
研究领域:
材料科学
·
电化学
·
纳米技术
·
储能
✓ 已验证
产品关联
DOI
高影响因子
CARBON
·
2025
·
IF 11.6
Xianghong Li,Yuan Shu,Tingkai Zhao,Jalil abdul,Haoxin Duan,Muyang Ma,Tao Jiang,Yanzong Liu
Electromagnetic functional materials are playing an increasingly vital role in electromagnetic interference shielding, stealth protection, and information security. Carbon nanotubes (CNTs), owing to their unique structure and outstanding electromagnetic properties, have attracted widespread attention. Here, a 3D Co/CoO/RGO/CNT crosslinked heterostructure was fabricated by in-situ growth of CNTs on Co(CO 3 ) 0 · 5 (OH)·0.11H 2 O precursors that were crosslinked with reduced graphene oxide through a combined hydrothermal and chemical vapor deposition strategy. The resulting interconnected conductive heterostructures significantly enhanced electron transport, interfacial polarization, and impedance matching. Notably, the optimized composites achieved a minimum reflection loss of −23.95 dB with an effective absorption bandwidth of 4.2 GHz (at 10 wt% filler loading and 2.17 mm thickness), fully covering the X-band. Furthermore, the study of heterointerfaces between different components and their underlying loss mechanisms provides critical insights into the electromagnetic wave absorption behavior and guides the rational design of advanced structural materials. Density functional theory simulations were also employed to investigate the electronic structure and charge distribution at the Co–CoO and Co–CNT interfaces. The simulation results reveal that charge redistribution and the formation of interface dipoles contribute to enhanced dielectric and magnetic losses, offering a microscopic explanation for the superior microwave absorption performance.
研究领域:
材料科学
·
电磁功能材料
·
纳米复合材料
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微波吸收
·
界面工程
✓ 已验证
产品关联
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2022
·
IF 9.221
Wendong Zhu,Ya Cheng,Ce Wang,Xiaofeng Lu
Nanozymes are a new type of enzymes with ultrahigh environmental stability while facing the issues of low activity and poor specificity. Fabricating a confined structure has been verified to be an ideal strategy to optimize the catalytic performance of nanozymes. In this study, a particle-in-tube structured NiO/CoO/polypyrrole (PPy) is prepared via an electrospinning, calcination, vapor-phase deposition and thermal reduction route. Due to the novel confined structure and synergistic effect between different components, the boosted peroxidase (POD)-like properties are revealed. Furthermore, the prepared NiO/CoO/PPy nanotubes exhibit excellent long-term stability and multi-batch reproducibility for POD mimicking. In addition, a catalase (CAT)-like property is also achieved. Based on its desirable POD-like performance, a rapid colorimetric sensing platform to detect glutathione (GSH) is established with a low detection limit of 0.02 μM (S/N = 3) and favorable selectivity. We believe that this work presents a new strategy to construct high-efficiency nanozymes and excavates its potential in biosensing application.
研究领域:
生物化学
·
材料科学
·
分析化学
✓ 已验证
DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2026
·
IF 10.6
Haosheng Lan,Yansen Qu,Yi Zhang,Le Ding,Zhanhong Zhao,Yingjie Xia,Yiman Xie,Zhiliang Liu,Xinghua Chang
Cu-Co nanoalloys were constructed and employed to drive electrocatalytic nitrate reduction to ammonia (ENRA). Comprehensive structure and electrochemical characterizations combined with theoretical calculations decipher that Co incorporation elevates the d -band center and keeps moderate aqueous *H supply, facilitating adsorption and hydrogenation of nitrate and oxynitride intermediates. Crucially, an efficiently integrated Cu 2 O/CoO heterojunction emerged on the surface of the Cu-Co nanoalloy. Spontaneous local charge redistribution at the Cu 2 O/CoO interface gives rise to distinct nucleophilic and electrophilic regions. Such heterogeneous structure is favourable for targeted asymmetric bridge adsorption of oxynitrides (*NO 2 , *NO), thus promoting breakage of N-O bond and suppressing the accumulation and desorption of intermediates. As a result, CuCo 3 exhibits excellent ENRA performance, featured with a nitrate removal rate of 74.7%, an ammonia selectivity of 98.7%, and a Faradaic efficiency of 90.2% at −0.6 V vs. RHE under neutral electrolyte. Coupling ENRA with an air stripping process, high purity solid NH 4 Cl is successfully obtained with a nitrogen recovery rate of 80% in conjunction with a high energy efficiency of 73%, demonstrating the practical feasibility of converting nitrate-containing wastewater into value-added ammonia products.
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产品关联
DOI
PubMed
高影响因子
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