INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2024
·
IF 8.1
Manigandan Ramadoss,Hesheng Yu,Xinsheng Li,Yuanfu Chen
The sluggish electro-kinetics of electron-driven water oxidation restricts the electrocatalyst-assisted electrical to life-valued product conversion applications. Herein, for the first time, self-assembled nanochain network, iron-doped cobalt oxide (Fe–CoO) embedded boron-doped carbon nanotubes (B-CNT), is synthesized via a facile self-assembly-hydrolysis strategy followed by Ostwald-ripening assisted crystal-growth approach. Due to its unique features, such as porous nanochain, low dimensional network, heteroatom distribution, and electronic modulated-rich active sites, it can synergistically accelerate the complicated multistep 4e − electron transfer kinetics, which guarantees Fe–CoO@B-CNT delivering extraordinary OER activity. Herein, a very low Tafel (54.6 mV/dev) and the overpotential of 260 mV to achieve a partial current density of 10 mAcm −2 in alkaline medium. Thus outperforms noble-metal and most cobalt/carbon-based electrocatalysts; furthermore, the hybrid delivers outstanding physicochemical stability over 48 h deprived of degradation. This work gives new insights into the rational designing and self-assembling fabrication of a hetero-atom doped hierarchical nanochain network with high conductivity and abundant active sites to significantly boost water oxidation activity.
研究领域:
材料科学
·
电化学
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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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PubMed
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
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电磁功能材料
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纳米复合材料
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微波吸收
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界面工程
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DOI
高影响因子
JOURNAL OF ENVIRONMENTAL MANAGEMENT
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2025
·
IF 8.4
Xiaoyi Huang,Qiangqiang Wu,Jingwen Tang,Rongsheng Ning,Jiang Yuan,Shengqiong Fang,Shuili Yu,Li'an Hou,Qinglun You
Building an effective heterogeneous Fenton catalyst over a broad pH range without the requirement for external energy input is still challenging. Herein, a vanadium-cobalt bimetallic catalyst (Co-V-8) are employed to extended a pH range of 3–9 by activating H 2 O 2 as a Fenton-like catalyst. The Co-based Co-V-8 catalysts demonstrate high diclofenac sodium deterioration efficiency (98.2%) under both acidic and alkaline environments, and the kinetic reaction rate within 15 min could reach 0.288 min −1 . Crucially, density functional theory (DFT) calculations imply that the Co-V-8 owned a narrower band gap and a higher Fermi level, which beneficial for quickening the electron transfer process. Results showed that the catalyst modified by V could introduce abundant oxygen vacancies, promote the decomposition of H 2 O 2 via V 3+ and V 4+ , and enhance the conversion of Co 3+ and Co 2+ , accelerating the formation of · OH, · OOH, · O − 2 and electron transfer process. Additionally, Co-V-8 promoted the utilization rate of H 2 O 2 exceeding 90% and exhibited exceptional catalytic ability in cleaning actual pharmaceutical wastewater. This research offers a sustainable separable and purification technology for wastewater remediation.
研究领域:
环境科学
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材料科学
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DOI
PubMed
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2026
·Vol. 37
·期 6
·416
·
IF 3.2
Tang Ruxuan,Chen Yuan-Bin,Su Xiuyuan
LiMg 6-x Co x AlO 8 (x = 0.01, 0.03, 0.05, 0.07) ceramics were successfully synthesized using the traditional solid-state reaction method. Among all the studied compositions, the sample with x = 0.03 sintered at 1360 °C exhibited the optimal microwave dielectric properties: a permittivity ( ε r ) of 9.98 ± 0.02, a high-quality factor ( Q × f ) reaching 147,664 ± 4,205 GHz, and a temperature coefficient of resonant frequency ( τ f ) of − 23 ± 1 ppm/°C. X-ray diffraction (XRD) combined with Rietveld refinement analysis confirmed that the primary crystalline phase is a LiMg 6-x Co x AlO 8 ceramic with a rock-salt structure of space group Fm-3 m (225). Additionally, a small amount of Co 3 O 4 secondary phase (also with the space group Fm-3 m ) was detected, accounting for approximately 3% of the total. X-ray photoelectron spectroscopy (XPS) characterization confirms that Co 2+ and Co 3+ coexist in CoO after sintering in air, exhibiting a mixed valence state. Scanning electron microscopy (SEM) results revealed that the sintering temperature significantly influenced the grain morphology and densification process. It was found that the density of the ceramics played a crucial role in determining both the ε r and Q × f values. Furthermore, based on the relationship τ f = - α L — τ ε /2, the correlation between the τ f value, the cationic bond energy, and its composition dependence was discussed. Based on the analysis of P–V-L theory, the ionicity of Li–O bonds and the lattice energy of Mg-O bonds exert a dominant effect on ε r and Q × f , respectively. This study holds potential reference value in the field of 5G/6G communications and lays a solid foundation for future developments in this area.
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CHEMICAL ENGINEERING JOURNAL
·
2021
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IF 13.273
Lin Sun,Yu Liu,Ming Yan,Qingjun Yang,Xiaoying Liu,Weidong Shi
The ideas of high effective specific surface area, multi-component and multi-phase synergistic are introduced to construct high-performance and high-stability electrodes. After etching and exchanging with Lewis acid (nickel ion) and annealing selenization, the hierarchical multi-phase Ni x Co 1-x Se 2 /carbon–nitrogen frameworks (CNFs, Zeolitic-Imidazolate-Framework-L derivatives) on CoO is synthesized. After systematic research, it is found that the concentration and reaction time of the Lewis acid and selenization conditions can directly affect the structure and composition (bimetal) of the electrode. In the optimal electrode, CNFs with the larger effective specific surface area can fully expose the active material to the electrolyte, the bimetal synergy (Ni-Co), and the multiphase synergy ((Ni, Co)Se 2 and CoSe 2 ) can effectively enhance the performance. The anode demonstrates a high mass-specific capacity of 207.8 mAh g −1 . A hybrid supercapacitor (Ni x Co 1-x Se 2 /CNFs/CoO@CC//activated carbon) is fabricated and displayed superior performance and stability: high energy density (45.0 Wh kg −1 , 800.0 W kg −1 ), and a cycle retention rate of 98.0% (12,000 cycles). LEDs in parallel were lit up by the devices, showing their practical value and potential.
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
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2019
·
IF 4.084
Shanshan Qiao,Jia Guo,Di Wang,Liugen Zhang,Afaq Hassan,Tingxiang Chen,Chao Feng,Yi Zhang,Jide Wang
It is of great significance to explore a bifunctional catalyst that can produce both hydrogen and oxygen to accelerate the development of water-splitting technology. In this work, Co@CoO/NG was obtained via calcinating ZIF-67 and in-situ preparation process, which exhibited excellent performance (water oxidation AQE 10.22% at λ = 450 nm and oxygen production rate 543198 μmol g −1 h −1 and hydrogen production rate 330 μmol −1 g −1 h −1 ). A comprehensive analysis of SEM, XRD , TEM, UV–vis, EIS , and PL showed that Co@CoO/NG-7 prepared has a perfect skeleton and more crystal defects , which can provide more reactive sites. The core-shell structure Co@CoO has a synergistic effect with graphene, which is beneficial to the light absorption, separation of photo-generated charges. Meanwhile, cyclic experiments of water oxidation and water reduction showed that the catalyst exhibited high stability during the reaction process. This study has provided a universal strategy to design efficient bifunctional catalyst for water-splitting.
研究领域:
材料科学
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能源科学
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DOI
高影响因子
ACS Applied Materials & Interfaces
·
2017
·
IF 7.504
Zhiyong Mao,Jingjing Chen,Yanfang Yang,Dajian Wang,Lijian Bie,Bradley D. Fahlman
Novel g-C3N4/CoO nanocomposite application for photocatalytic H2 evolution were designed and fabricated for the first time in this work. The structure and morphology of g-C3N4/CoO were investigated by a wide range of characterization methods. The obtained g-C3N4/CoO composites exhibited more-efficient utilization of solar energy than pure g-C3N4 did, resulting in higher photocatalytic activity for H2 evolution. The optimum photoactivity in H2 evolution under visible-light irradiation for g-C3N4/CoO composites with a CoO mass content of 0.5 wt % (651.3 μmol h–1 g–1) was up to 3 times as high as that of pure g-C3N4 (220.16 μmol h–1 g–1). The remarkably increased photocatalytic performance of g-C3N4/CoO composites was mainly attributed to the synergistic effect of the junction or interface formed between g-C3N4 and CoO.
研究领域:
材料科学
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光催化
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能源化学
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纳米科技
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可持续能源
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DOI
高影响因子
ACS Omega
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2018
·
IF 0
Anning Jiang,Nagapradeep Nidamanuri,Chenyun Zhang,Zhonghao Li
The sluggish oxygen evolution reaction (OER) hinders the development of electrocatalytic water splitting for energy conversion and storage. Therefore, it is imperative to explore the cost-effective and highly efficient noble-metal-free electrocatalysts for OER. Herein, we are introducing such OER electrocatalyst based on Co, fabricated through an ionic-liquid-assisted one-step synthesis, where ionic liquid played a dual role as solvent cum structure-directing agent. Besides possessing large-accessible surface area and numerous active sites, the as-prepared stable CoO nanosheets exhibited excellent electrochemical activity through establishing an extensive contact with the electrolyte. Under alkaline conditions, the overpotential to achieve a current density of 10 mA cm–2 is only 320 mV, and the Tafel slope is as small as 70 mV dec–1. Thus, our work provides a new pathway for designing and engineering the highly efficient non-noble metal OER electrocatalysts by using ionic liquids.
研究领域:
材料科学
·
能源化学
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DOI
PubMed
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2020
·
IF 4.939
Shasha Zhu,Jinglei Lei,Lina Zhang,Jianxin He
The exploration of catalysts with high activity and low cost for water splitting is still necessary. Herein, a nanowire-like morphology CoO/NF electrode is synthesized using facile hydrothermal reaction and calcination treatment. The urea can regulate its morphology during the synthetic process of CoO/NF. Electrochemical studies reveal that the as-obtained CoO/NF exhibits excellent electrocatalytic performance with overpotential of 307 mV at current density of 10 mA cm −2 and Tafel slope of 72 mV dec −1 for oxygen evolution reaction , and CoO/NF delivers current density of 10 mA cm −2 at overpotential of 224 mV for hydrogen evolution reaction . The results of the oxygen evolution reaction stability show that the overpotential of CoO/NF electrode is only increased by 4 mV at current density of 10 mA cm −2 . The two-electrode water splitting with CoO/NF electrodes as both anode and cathode needs a cell potential of 1.76 V to reach 10 mA cm −2 . Therefore, this simple method to prepare CoO/NF electrode can enhance the properties of electrocatalysts , which makes CoO/NF a promising material to replace noble metal-based catalysts.
研究领域:
材料科学
·
电化学
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产品关联
DOI
高影响因子
SOLAR ENERGY MATERIALS AND SOLAR CELLS
·
2019
·
IF 6.019
Qiu Zhang,Zhanbin Jin,Fengyan Li,Zhinan Xia,Yi Yang,Lin Xu
For boosting the power conversion efficiency (PCE) of quantum dot sensitized solar cells (QDSSCs), metal oxide (CoO) has been prepared via a facile mean and applied for CE materials in CdS/CdSe/ZnS QDSSCs. The electrochemical properties of the CoO counter electrode (CE) and photovoltaic performances of QDSSCs are investigated in detail. Under analogous sunlight illumination, compared with traditional Cu 2 S CE, the QDSSCs fabricated with CoO CE showed an obvious enhancement in cell properties and increased the power conversion efficiency (PCE) by 32.7%. A PCE of 6.02% was achieved by the QDSSCs with CoO CEs, which deliver a short circuit current density (J sc ) of 20.42 mA/cm 2 , open circuit voltage (V oc ) of 0.655 V and fill factor (FF) of 0.45. Research so far has shown that metal oxide (e.g. CoO) has many excellent properties, such as good electrical conductivity , outstanding catalytic activity , relatively small charge transfer resistance , large surface area and cost-effective, so it is very promising to be a CE material for QDSSCs.
研究领域:
材料科学
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能源研究
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DOI
高影响因子
Nanomaterials
·
2021
·Vol. 11
·期 3
·694
·
IF 5.076
Ruoxin Yuan,Hao Wen,Li Zeng,Xi Li,Xingang Liu,Chuhong Zhang
Supercritical CO2(scCO2) is often used to prepare graphene/metal oxide nanocomposite anodes for high performance lithium-ion batteries (LIBs) by the assisted solvothermal method due to its low viscosity, high diffusion, zero surface tension and good surface wettability. However, the formation mechanism of metal oxides and the combination mechanism between metal oxides and graphene in this system are superficial. In this work, a cobalt monoxide/graphene (CoO/G) nanocomposite is fabricated via the scCO2assisted solvothermal method followed by thermal treatment. We elucidate the mechanism that amorphous intermediates obtain by the scCO2assisted solvothermal method, and then ultrafine CoO nanoparticles are crystallized during the heat treatment. In addition, scCO2can promote CoO to be tightly fixed on the surface of graphene nanosheets by interfacial chemical bonds, which can effectively improve its cycle stability and rate performance. As expected, the CoO/G composites exhibit higher specific capacity (961 mAh g−1at 100 mA g−1), excellent cyclic stability and rate capability (617 mAh g−1after 500 cycles at 1000 mA g−1) when applied as an anode of LIB.Keywords:lithium-ion battery;anode;supercritical carbon dioxide;cobalt monoxide;graphene
研究领域:
材料科学
·
能源科学
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DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）