International Journal of Electrochemical Science
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2024
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IF 1.3
Ying Geng,Chun-yong Zhang,Lin Zhu,Hao-yu Wang,Ji-rong Bai,Jing-jing Huang,Zhen-long Zhao
s Polymer catalyst electrodes have good electrical conductivity, high mechanical strength and other characteristics, which have good prospects in the future market of green and low carbon. In this paper, the electrode of PEDOT polymer catalyst is studied, and the electrochemical performance of the electrode is improved by doping different metals. This study describes the design of PEDOT-Co 3 O 4 @Mn 3 O 4 /Mn 2 O 3 catalysts by simple solvothermal synthesis. As a catalyst in the hydrogen evolution reaction (HER), the overpotential of the same polarization curve is much smaller than that of PEDOT, with a Tafel slope of 118.21 mV dec ‐1 , by electrochemical and characterization analysis. In the test of the supercapacitor performance, it has a large specific capacitance of 1298.5 Fg -1 and a small electrical impedance (0.21 Ω). After 2000 cycles of CV test, the capacitance remains 87.76 %, and the curve shape is stable, which proves that it has good electrochemical performance. Our results confirm the materials have great application prospects in HER and capacitors.
研究领域:
材料科学
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电化学
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能源存储与转换
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DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2025
·
IF 13.2
Yong Liu,Mingjun Han,Jianye Liu,Yaling Huang,Yisi Liu,Wenzhang Li,Yang Liu,Jie Li
The practical implementation of Li-O 2 batteries remains constrained by three persistent challenges: sluggish oxygen redox kinetics, prohibitive costs of noble metal catalysts, and insufficient activity of non-precious alternatives. Herein, we present a novel ultralow Pt (0.25 wt%) single-atom loading Co 3 O 4 nanoneedle array catalyst (Pt 1 -Co 3 O 4 ) grown on carbon cloth via an ionic substitution strategy. This material functions as an advanced self-supporting cathode for aprotic Li-O 2 batteries. Benefiting from the surface self-reconstruction induced by Pt single-atom occupied the tetrahedral central sites of Co 3 O 4 , the electronic structure of Co 3 O 4 is modified, significantly enhancing the kinetics of both the oxygen reduction reaction (ORR) and oxygen evolution reaction (OER). As a result, the Pt 1 -Co 3 O 4 cathode demonstrates excellent cycling stability and a remarkably low discharge–charge overpotential of just 0.86 V. Furthermore, the Li-O 2 battery with this cathode exhibits a high discharge-specific capacity (8.20mAh cm −2 ) and long cycling life (220 cycles, >1100 h at 0.1 mA cm −2 ), outperforming all reported Co 3 O 4 -based ORR/OER catalysts, as well as many non-noble metal catalysts, even those with significant noble metal loading. Crucially, the thin-film-like layers of discharge product Li 2 O 2 are uniformly dispersed on the Pt 1 -Co 3 O 4 nanoneedles. This reduces the adsorption energy between LiO 2 /Li 2 O 2 and Pt 1 -Co 3 O 4 compared to Co 3 O 4 , ensuring good structural stability during discharge/charge cycles and facilitating the decomposition of discharge products during recharge, thus reducing overvoltage and enhancing battery efficiency. These findings position Pt 1 -Co 3 O 4 as a promising catalyst for Li-O 2 batteries and open new avenues for the development of oxide-based single-atom catalysis.
研究领域:
材料科学
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电化学
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能源存储与转换
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DOI
高影响因子
DIAMOND AND RELATED MATERIALS
·
2024
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IF 4.3
Xiaowei Liu,Konghu Tian,Chao Zhang,Jing Wang,Yufei Li,Lixin Xu,Chulgyu Jhun,Liang Zhang
This study obtained cobalt nitrate (Co 3 O 4 )/carbon fibers (CF) composites with a core-shell structure using in situ Co 3 O 4 growth on lightweight and flexible hydrophilic CF through a hydrothermal synthesis method and simple heat treatment to improve the attenuation of microwaves and their absorption properties. The urea content was adjusted to tune the needle-like morphology of Co 3 O 4 . The results showed that sample S3 had excellent microwave absorption (MA) performance with a minimum reflection loss ( RL min ) of −61.55 dB at a thickness of 4.75 mm. However, the thickness corresponding to the maximum effective absorption bandwidth (EAB, RL<-10 dB) of 4.72 GHz was only 1.88 mm, covering almost the entire Ku band. CF, as the core of structures, significantly impact microwave reflection. However, the Co 3 O 4 shell coating dominated the dielectric loss of the Co 3 O 4 /CF composite, and its MA performance improved with the refinement of the Co 3 O 4 structures. This study provided a practical solution for preparing lightweight and efficient transition metal oxide and carbon-based MA composites.
研究领域:
材料科学
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电磁学
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DOI
高影响因子
Catalysts
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2025
·Vol. 15
·期 5
·491
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IF 4
Hao Yu,Shen Yan,Jiahua Zhang,Hua Wang
Electrocatalytic nitrate reduction reaction (NO3−RR) to ammonia (NH3) presents an alternative, sustainable approach to ammonia production. However, the existing catalysts suffer from poor NH3yield under lower concentrations of NO3−, and the kinetic understanding of bimetal catalysis is lacking. In this study, a Co3O4–modified Cu2+1O nanowire (CoCuNWs) catalyst with a high specific surface area was synthesized to effectively produce NH3from a 10 mM KNO3basic solution. CoCuNWs demonstrated a high NH3yield rate of 0.30 mmol h−1cm−2with an NH3Faradaic efficiency (FE) of 96.7% at −0.2 V vs. RHE, which is 1.5 times higher than the bare Cu2+1O NWs. The synergistic effect between Co3O4and Cu2+1O significantly enhanced both the nitrate conversion and ammonia yield. Importantly, it is revealed that the surface of CoCuNWs is kinetically more easily saturated with NO3−(NO2−) ions than that of Cu2+1O NWs, as evidenced by both the higher current density and the plateau occurring at higher NOx−concentrations. In addition, CoCuNWs exhibit a higher diffusion coefficient of NO3−, being 1.6 times higher than that of Cu2+1O NWs, which also indicates that the presence of Co3O4could promote the diffusion and adsorption of NO3−on CoCuNWs. Moreover, the ATR–SEIRAS analysis was applied to illustrate the reduction pathway of NO3−to NH3on CoCuNWs, which follows the formation of the key intermediate from *NO2−, *NO, *NH2OH to *NH3. This work presents a strategy for constructing dual–metal catalysts for NO3−RR and provides an insight to understand the catalysis from the perspective of the kinetics.
研究领域:
电化学
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催化材料
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环境科学
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产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2022
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IF 6.371
Jie Zhu,Qian Zhang,Peng Zhao,Lin Chen,Sudong Yang,Qiang Yan,Hongmei Li
Exploring robust and high-performance bifunctional electrocatalysts for overall water splitting is crucial for converting electric power to hydrogen energy, especially for the flexible utilization of intermittent green energy resources. Herein, pine-needle-like NiFe 2 O 4 @Co 3 O 4 heterostructure nanoarrays with abundant oxygen vacancies were deposited onto nickel foam via hydrothermal reaction , cathodic electrodeposition , and CaH 2 reduction. The synergistic approach boosts the electrochemical activity of catalyst by improving conductivity, mass diffusion efficiency, and active site quantity. Accordingly, the optimal electrocatalyst exhibits outstanding catalytic activity with high electrochemical stability in an alkaline medium, providing low overpotentials of 251 mV and 77 mV respectively to achieve 10 mA·cm −2 for catalyzing OER and HER . Moreover, the as-fabricated bifunctional electrocatalyst only requires a cell voltage of 1.56 V to enable a current density of 10 mA·cm −2 for realizing water electrolysis, outperforming many other previously reported catalysts. This work provides an inspiration for developing open structure materials with synergistic effect, and demonstrates a feasible method to synthesis high-efficiency electrocatalysts 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
Journal of Energy Storage
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2024
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IF 8.9
Xiangyu Han,Zhiwei Ge,Xipeng Lin,Haoshu Ling,Yakai Bai,Lin Lin,Shuang Zhang,Long Peng,Liang Wang,Haisheng Chen
Metal oxide redox system characterized open-loop operation, high energy density, and high reversibility, which is one of the most promising thermochemical energy storage technologies for the next-generation concentrated solar power plants . Most of the previous studies focused on the material properties, while the energy storage performance of oxide monolithic bodies, such as energy storage density and heat storage/release rate, has rarely been reported. In this paper, a novel and effective method for the improvement of the energy storage performance of oxide honeycombs with multi-scale composite pores is proposed and presented. Methyl cellulose and four common biomass materials, including bagasse, loofah, juniper leaf, and pine needle, were used as pore-forming agents for oxide honeycombs. The pyrolysis of methyl cellulose forms small-scale pores in the honeycomb bodies and contributes the major pore volume. The biomass templates further optimize the pore characteristics, all biomass-templated Co 3 O 4 -based honeycomb bodies have higher total pore volume and permeability than that of biomass-free honeycomb body. The honeycomb with 2.5 wt% pine needle achieves the highest energy storage density , with an average of 694.62 kJ/kg during the second to fifteenth cycles. In addition, the honeycomb containing 7.5 wt% pine needle has the highest energy store/release rate. Biomass-templated Co 3 O 4 -based honeycomb shows a high crushing strength, and there are no obvious cracks and structural deformations on its surface after 15 thermal cycles. The findings demonstrate that the methyl cellulose and biomass template method can effectively optimize the pore structure and energy storage properties of the oxide honeycombs, thereby expanding the application prospects of Co 3 O 4 -based honeycombs in thermochemical energy storage .
研究领域:
材料科学
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能源工程
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产品关联
DOI
高影响因子
ELECTROCHIMICA ACTA
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2020
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IF 6.215
Yinchao Zhao,Chenguang Liu,Ruowei Yi,Ziqian Li,Yanbing Chen,Yinqing Li,Ivona Mitrovic,Stephen Taylor,Paul Chalker,Li Yang,Cezhou Zhao
There is considerable scientific interest in the newly available family of MXenes material. An analog as graphene, this two-dimensional (2D) layered material with the structure of transition metal carbides or nitrides exhibits superior electronic conductivity , large interlayer spacing for highly efficient lithium ions diffusion pathways and environmental benignity, making it useful as energy storage material . However, the inferior capability to store lithium ions impedes its wide application in lithium-ion batteries. Therefore, a facile strategy for preparing Co 3 O 4 nanoparticles incorporated with MXene nanosheets on Ni foams has been developed. Small-size Co 3 O 4 nanoparticles are uniformly distributed within the MXene nanosheets leading to the highly efficient lithium ions and electrons transmission, as well as the prevention for the restacking of MXene nanosheets and huge volume change of the Co 3 O 4 nanoparticles . Under the cooperative effect of Co 3 O 4 nanoparticles and MXene nanosheets , the Co 3 O 4 /MXene composite electrode with the mass ratio of Co 3 O 4 /MXene = 1:1 exhibits an excellent reversible capacity of 1005 mAh g −1 after 300 cycles at the current density of 1 C, which significantly exceeds that of pristine Co 3 O 4 electrode. Though the current density climbs to 5 C, the composite electrode remains a stable capacity of 307 mAh g −1 after 1000 cycles. It is demonstrated that Co 3 O 4 /MXene composite electrode has the potential as an anode for the high-performance lithium-ion batteries.
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
CHEMICAL ENGINEERING JOURNAL
·
2018
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IF 6.735
Yarong Bai,Junping Dong,Yaqin Hou,Yaoping Guo,Yongjin Liu,Yulin Li,Xiaojin Han,Zhanggen Huang
Herein, a series of Co 3 O 4 nanoparticles inlaid in porous carbon (CoO x @PC-T) were successfully prepared via first pyrolysis of ZIF-67 in argon atmosphere at different temperature and then oxidized in 5% O 2 /Ar mixed gas. The as-made samples were employed as catalysts for selective catalytic reduction of NO x with NH 3 at low temperature (100 °C–200 °C). The effect of pyrolysis temperature on the microstructure, textural properties, and chemical properties of CoO x @PC-T were characterized by TG-MS, BET, XRD, SEM, TEM, H 2 -TPR and XPS in detail. Results show that the pyrolysis temperature has a significant effect on the carbonization degree of carbon in ZIF-67, and which in turn affects the exposure and oxidization of cobalt nanoparticles on the catalyst surface. Experiments results show that CoO x @PC-800 display the highest NO x conversion ratio, which is attributed to its higher ratio of Co 3+ /Co 2+ and large specific surface area. Moreover, the stability, H 2 O and SO 2 resistance of CoO x @PC-800 were also studied.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
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2024
·
IF 6.9
Liusha Cen,Fan Yu,Shixue Liu,Chengcai Li,Wangyong Jin,Chenliang Wang,Hailin Zhu,Yuhai Guo
The technology that catalyst activated perxymosulfate (PMS) has been widely used in the decomposition of organic pollutants. We prepared Zn and Co-based ZIF and obtained C-doping Co 3 O 4 / ZnO heterojunction after pyrolysis. C-doping Co 3 O 4 / ZnO heterojunction with cage core-shell structure was loaded on the polyvinylidene fluoride (PVDF) membranes with a layered porous structure by solvent-assisted nanoparticle embedding (SANE) method, where the carmine degradation reached 99.6 % by MC-430 activated Perxymosulfate (PMS) within 10 min. The influencing factors (such as the pyrolysis temperature, PMS dosage, and dye concentration) on OFX degradation were observed, and MC-430 exhibited good tolerance for these factors and a wide range of solution hydrogen ion concentrations (pH= 4–10). The strong reusability and stability analysis showed that the carmine degradation of the MC-430/PMS system changed minorly (from 99.6 % to 97.7 %) in 5 consecutive cycles without any treatment. The degradation mechanism was confirmed by capture experiments, in which the non-free radical path was the main one and the free radical path was the auxiliary one. Moreover, structure characterizations and density functional theory calculations verified that doped C sites provided a channel for electron transfer from Zn sites to Co sites, which increased the generation rate of reactive oxygen species (ROS) and prolonged the catalyst life. This work provides a new method for the preparation of nonmetallic doping bimetallic strong coupling catalysis.
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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产品关联
DOI
高影响因子
ACS Sensors
·
2025
·
IF 9.1
Yulin Zhu,Yan Liang,Jianxian You,Dehua Wang,Jiahao Li,Yanxing Yang,Yong Yang
The resistive gas sensors based on semiconductor materials provide an effective strategy for the detection of harmful gases. However, the limitations of surface gas adsorption activity and interface charge transfer efficiency of semiconductor sensing materials, as well as the complex device fabrication process, pose significant challenges to the development of sensors. Here, a ternary Co3O4/ZnIn2S4/Pt heterostructure arrays gas sensor is designed, which consists of Co3O4 nanowire arrays grown in situ on an alumina flat substrate as backbones, ultrathin ZnIn2S4 nanosheets wrapped around the surface of Co3O4 nanowires, and highly dispersed Pt nanoparticles on the outermost layer. It enables superior sensing performance for the detection of the volatile organic compound triethylamine, which exhibits a significant response of ∼118.97 (Ra/Rg) toward 100 ppm of triethylamine at a relatively low working temperature of 200 °C, along with excellent response/recovery speed, selectivity, and enduring stability (over 3 months). Based on first-principles calculation and a series of spectroscopic characterization (including in situ spectroscopy), it is revealed that the heterostructure arrays exhibited enhanced adsorption activity for both oxygen and triethylamine molecules. Most importantly, the robust p-n heterointerface (Co3O4/ZnIn2S4) and semiconductor-metal heterointerface (Co3O4/Pt, ZnIn2S4/Pt) are formed in the ternary heterostructure, achieving efficient multi-interface charge transfer characteristics. In addition, thanks to the design of in situ 1D/2D/0D porous array structures, the ternary Co3O4/ZnIn2S4/Pt heterostructure arrays not only have large specific surface areas for gas reaction but also simplify device manufacturing. This research offers novel perspectives on boosting the gas sensing performance of semiconductor materials through the comprehensive design of ternary heterostructures with robust multi-interfaces.
研究领域:
材料科学
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化学工程
·
半导体技术
✓ 已验证
DOI
PubMed
高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2022
·Vol. 29
·期 52
·79184-79198
·
IF 5.19
Zhao Yajuan,Dang Pu,Gao Yaqian,Li Yan,Xie Huidong,Yang Chang
Co 3 O 4 /Bi 4 O 7 /Bi 2 O 3 (CBB) composites were prepared, in which Co 3 O 4 was synthesized from Co-MOF as precursor. The peroxymonosulfate (PMS) activated by CBB catalyst under visible light was used to degrade tetracycline (TC). Owing to the synergistic effect of photocatalysis and PMS activation, 98.4% of TC was removed within 60 min. The optimal loading of Co 3 O 4 was determined, and the influence of PMS dosage, initial pH, and disturbing anions on the degradation effect were investigated. The “CBB + Vis + PMS” system showed good reusability, and the degradation was only reduced by 1.7% after 5 cycles. This system also had a good degradation of other five pollutants. The quenching experiment showed that holes (h + ), superoxide radicals (·O 2 − ), and singlet oxygen ( 1 O 2 ) were the main active species. The degradation products of TC were determined by liquid chromatography-mass spectrometry, and the degradation pathway was proposed. Finally, a double Z-scheme degradation mechanism was proposed in the “CBB + Vis + PMS” system. The peroxymonosulfate activated by CBB under visible light to degrade organic pollutants has widespread application prospects in environmental remediation. Graphical abstract
研究领域:
环境科学
·
催化化学
✓ 已验证
DOI
PubMed
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
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2025
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IF 7.7
Xinzhi Wang,Jie Hu,Wangwang Guan
In this work, a self-template in situ etching strategy was applied to fabricate a hollow shuttle-like WO 3 -Co 3 O 4 heterojunction. The morphology and nanostructure were investigated comprehensively by a series of techniques. Notably, the hollow shuttle-like WO 3 -Co 3 O 4 shows a large specific area and promising architecture, which can efficiently promote the gas adsorption-desorption process and provide more active sites in whole composites. Compared to other sensing devices, the WO 3 -Co 3 O 4 sample with hollow shuttle-like architecture shows the best gas sensing characterizations, and the response to 100 ppm acetone is as high as 52 under optimum working temperature. Moreover, it also presents good repeatability, high against moisture, fast response-recovery speed and long-term stability. The enhanced gas sensing characterizations can be ascribed to the synergistic effect of a unique hollow shuttle-like structure and the p-n heterojunction at the interface of WO 3 and Co 3 O 4 . These admirable properties make it an excellent candidate for constructing high-performance acetone sensors. In addition, the relative sensing mechanism of shuttle-like WO 3 -Co 3 O 4 composites-based sensors will be discussed in detail.
研究领域:
材料科学
·
传感器技术
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产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）