Energy & Environmental Materials
·
2024
·
IF 13
Li Zhang,Peiyue Jin,Ze Wu,Bo Zhou,Junchang Jiang,Aomeng Deng,Qiuyue Li,Tanveer Hussain,Yiqiong Zhang,Hanwen Liu,Shuangyin Wang
The electrochemical coupling of biomass oxidation and nitrogen conversion presents a potential strategy for high value-added chemicals and nitrogen cycling. Herein, in this work, CuO/Co 3 O 4 with heterogeneous interface is successfully constructed as a bifunctional catalyst for the electrooxidation of 5-hydroxymethylfurfural to 2,5-furandicarboxylic acid and the electroreduction of nitrate to ammonia (NH 3 ). The open-circuit potential spontaneous experiment shows that more 5-hydroxymethylfurfural molecules are adsorbed in the Helmholtz layer of the CuO/Co 3 O 4 composite, which certifies that the CuO/Co 3 O 4 heterostructure is conducive to the kinetic adsorption of 5-hydroxymethylfurfural. In situ electrochemical impedance spectroscopy further shows that CuO/Co 3 O 4 has faster reaction kinetics and lower reaction potential in oxygen evolution reaction and 5-hydroxymethylfurfural electrocatalytic oxidation. Moreover, CuO/Co 3 O 4 also has a good reduction effect on NO 3 − $$ {\mathrm{NO}}_3^{-} $$ . The ex-situ Raman spectroscopy shows that under the reduction potential, the metal oxide is reduced, and the generated Cu 2 O can be used as a new active site for the reaction to promote the electrocatalytic conversion of NO 3 − $$ {\mathrm{NO}}_3^{-} $$ to NH 3 synthesis. This work provides valuable guidance for the synthesis of value-added chemicals by 5-hydroxymethylfurfural electrocatalytic oxidation coupled with NO 3 − $$ {\mathrm{NO}}_3^{-} $$ while efficiently producing NH 3 .
研究领域:
化学工程
·
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2024
·Vol. 48
·期 28
·12535-12543
·
IF 2.7
Bo Sun,Man Li,Lifeng Cheng,Qijian Li,Xiaowen Chen,Shengqi Wang,Wenhua Yan,Lei Wang,Fuxiang Wei,Qingliang Wang
Transition metal oxides (TMOs) have excellent electrochemical properties. However, they are commonly associated with short cycle lives, agglomeration, and lower electrical conductivity. To ameliorate these drawbacks, porous rod-shaped CuO@Co3O4 has been synthesized through calcination with optimized oxidation temperature by using CuCo-MOF-74 as a template. Due to the porous structure, the CuO@Co3O4 electrode significantly increases the contact area with the electrolyte and greatly improves the reaction kinetics. As a result, the CuO@Co3O4 electrode exhibits excellent electrochemical performance with a specific capacitance of 545.5 F g−1 at a current density of 1 A g−1. The capacitance retention at 10 A g−1 was 88.7% after 10 000 cycles. Furthermore, an asymmetric supercapacitor (SC) has been assembled with CuO@Co3O4 as the positive electrode and commercial reduced graphene oxide (RGO) as the negative electrode, and the device has exhibited an energy density of 38.2 W h kg−1 at a power density of 1268.3 W kg−1. Impressively, the capacitance retention remained 83.2% even after 10 000 cycles at a high current density of 10 A g−1. This performance has demonstrated the potential of CuO@Co3O4 as an anode material for SCs.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
CHINESE JOURNAL OF CHEMICAL ENGINEERING
·
2021
·
IF 3.171
Yingmeng Zhang,Luting Liu,Qingwei Deng,Wanlin Wu,Yongliang Li,Xiangzhong Ren,Peixin Zhang,Lingna Sun
Hybrid CuO-Co 3 O 4 nanosphere building blocks have been embedded between the layered nanosheets of reduced graphene oxides with a three dimensional (3D) hybrid architecture (CuO-Co 3 O 4 -RGO), which are successfully applied as enhanced anodes for lithium-ion batteries (LIBs). The CuO-Co 3 O 4 -RGO sandwiched nanostructures exhibit a reversible capacity of ~847 mA·h·g −1 after 200 cycles’ cycling at 100 mA·g −1 with a capacity retention of 79%. The CuO-Co 3 O 4 -RGO compounds show superior electrochemical properties than the comparative CuO-Co 3 O 4 , Co 3 O 4 and CuO anodes, which may be ascribed to the following reasons: the hybridizing multicomponent can probably give the complementary advantages; the mutual benefit of uniformly distributing nanospheres across the layered RGO nanosheets can avoid the agglomeration of both the RGO nanosheets and the CuO-Co 3 O 4 nanospheres; the 3D storage structure as well as the graphene wrapped composite could enhance the electrical conductivity and reduce volume expansion effect associated with the discharge-charge process.
研究领域:
材料科学
·
能源存储
·
纳米技术
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Yufeng Wu,Shiyang Feng,Kui Yang,Wenjian Yang,Chao Li,Xuejun Cui,Jinxing Ma
Electrochemical ammonia synthesis via nitrate reduction reaction (NO 3 RR) offers a sustainable solution for mitigating nitrate pollution while recovering valuable nitrogen resources. Conventional flow-by/batch systems suffer from slow kinetics and low current efficiency due to a thick boundary layer at the electrode surface, which impairs NO 3 RR activity and selectivity. This study introduces a novel flow-through configuration employing a micron-porous CuO-Co 3 O 4 composite membrane electrode for enhanced NO 3 RR. Computational fluid dynamics simulations revealed a significantly thinner boundary layer (∼10 μm) in the flow-through mode compared to flow-by (>120 μm). Consequently, the flow-through mode exhibited a seven-fold increase in NO 3 RR kinetics, boosting the ammonia Faradaic efficiency (FE) from 7.2 % to 79.8 %. Optimization of the Co 3 O 4 membrane electrode, addressing parameters of Cu/Co loading and pore size, further enhanced performance. This achieved high ammonia selectivity and FE (up to 95.7 % and 88.1 %, respectively) across a broad nitrate concentration range (0.02–1.0 g N L −1 ). Mechanistic investigations, integrating scavenger-quenching experiments, electrochemical analyses, and electron paramagnetic resonance spectroscopy demonstrated that ammonia synthesis primarily followed the dominance of the direct electron transfer (DET) between the flow-through cathode and nitrate/nitrite, while hydrogen species (H*) served an auxiliary function. These results underscore the effectiveness of the flow-through membrane electrode configuration in facilitating efficient electrochemical ammonia synthesis, offering valuable insights for the advancement of electrochemical technologies for pollution control and resource recovery.
研究领域:
环境科学
·
电化学工程
✓ 已验证
产品关联
DOI
高影响因子
ChemPlusChem
·
2022
·Vol. 87
·期 11
·e202200290
·
IF 3.21
Wenjuan Bai,Bozheng Wang,Shaobo Yang,Song Yan,Chaochao Cao,Zheng Zhou,Jiawei Ji,Kai Guo,Chengchun Tang
Graphical A bimetallic oxide co-modified CuO−Co 3 O 4 /P−BNFs material is reported in this work, which significantly improved the adsorption performance on TCs, and the removal rate of TCs was more than twice that of P−BNFs under the same conditions. The presence of antibiotic contaminants in aqueous environment already poses significant risks to ecological sustainability, biodiversity and human public health and safety. Therefore, it is urgent to develop practical water pollution control technologies and new materials. Here, we prepared CuO−Co 3 O 4 co-modified porous boron nitride fibers (P−BNFs) for the adsorption and removal of tetracycline antibiotics (TCs) in aqueous environment. The prepared adsorbents were characterized by XRD, FTIR, XPS, SEM, TEM and BET, and the adsorption behavior was explored by batch experiments. The results show that the removal percentage for doxycycline (DC) reaches 98.68 %, which was much higher than that of P−BNFs, and the modification results of P−BNFs with CuO or Co 3 O 4 alone. After five regeneration cycles, the removal rate of DC by CuO−Co 3 O 4 /P−BNFs was still as high as 89.33 %. This is promising and indicates that the prepared CuO−Co 3 O 4 /P−BNFs adsorbent has good renewable recycling performance and practical application prospects.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
APPLIED SURFACE SCIENCE
·
2023
·
IF 6.7
Yuanzhong Li,Liling Li,Yufa Feng,Huize Wang,Jinyun Liao,Jianwei Ren,Weiyou Zhou,Mingyang He,Hao Li
Engineering and fabricating cost-effective and high-performing bifunctional catalysts for ammonia borane (AB) hydrolysis and methanolysis is paramount for their commercial availability. A series of rattle-structured CuO/Co 3 O 4 @C microsphere bifunctional catalysts for AB hydrolysis and methanolysis were produced using a simple hard template etching approach. The CuO/Co 3 O 4 @C-4 (4 refers to designed the mole ratio of Cu/Co) exhibits the best activity with TOF of 18.8 and 26.8 mol H2 ·mol cat -1 ·min −1 for AB hydrolysis and methanolysis, respectively. It is discovered that the excellent performance is mainly attributed to its unique rattle structure and the synergetic effect between Co 3 O 4 and CuO . Kinetic isotope effect (KIE) experiments and infrared spectroscopy were applied to investigate AB hydrolysis and methanolysis reaction mechanisms. A suggested mechanism for AB methanolysis on rattle-structured CuO/Co 3 O 4 @C-4 is proposed based on the experiment results. This work could provide useful guidance for the construction of high-performance bifunctional catalysts for AB hydrolysis and methanolysis for hydrogen production.
研究领域:
材料科学
·
催化化学
·
能源化学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2022
·
IF 7.392
Kean Chen,Binxian Chu,Qiuju Qin,Xuemei Ou,Runqi Zhao,Xiaoling Wei,Huan Wu,Bin Li,Lihui Dong
As an ideal substitute for the precious metals in the selective catalytic reduction of NO by CO, transition metal oxides perform very well. Thus, a series of CuO - Co 3 O 4 symbiotic oxide porous nanosheet catalysts are prepared with a CTAB-assisted hydrothermal method. Cu5 with the ratio of Cu and Co is 5 : 10, has the best activity on the premise of maintaining the nanosheet structure. Reduction pretreatment of Cu5 with H 2 is carried out, and the surface will be rapidly oxidized in air. In this period, Cu, CuO and Co 3 O 4 were produced and coexisted on surface. Cu5-re-163 exhibits greatly higher N 2 selectivity but a little inferior NO conversion. Further DFT calculation and characterizations proved that [N] free radicals exist during the reaction. The reaction on Cu5 and Cu-re-163 follow L-H and E-R mechanism respectively. [N] radicals on the latter are much easier to desorb, so that they are easy to combine with each other to form N 2 rather than with NO to generate N 2 O, as the reason why Cu5-re-163 has better selectivity.
研究领域:
催化化学
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材料科学
·
理论计算化学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Feng Chen,Xuebin Lin,Wei Chen,Na Wen,Yanqiao Jin
The design of a highly active Cu-Co catalyst for catalytic transfer hydrogenolysis of lignin without the use of external hydrogen remains highly challenging. In this work, Cu 2 O was initially encapsulated in ZIF-67, and subsequently Cu 2 O@ZIF-67 was utilized as a precursor and sacrificial template to prepare the unique double core–shell hollow nanocage CuO@Co 3 O 4 . Co and Cu, serving as Lewis acid sites and dehydrogenation sites for the hydrogen-donor solvent isopropanol, respectively, exhibited synergistic enhancement, further increasing the catalytic activity. Under the optimal conditions of 220 °C, 1 MPa N 2 , and 4 h, the catalyst achieved 100 % conversion of 2-phenoxy-1-phenylethanol and 100 % yield towards cyclohexanol and ethylbenzene. Furthermore, the catalyst remained stable and reusable after 5 cycles, providing a practicable guidance for the value-added conversion of lignin.
研究领域:
化学工程
·
催化材料科学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Energy Storage
·
2024
·
IF 8.9
Bairui Tao,Xiaoyan Feng,Fengjuan Miao
In order to solve the problem of glucose detection in medical development and meet the urgent demand for new energy storage devices, this paper proposes a new material suitable for glucose sensing and capacitive properties. The sensor was fabricated by depositing Co 3 O 4 nanoparticles onto nickel foam with integrated r-GO via the hydrothermal method, followed by the synthesis of CuO nanoparticles using electroplating. The detection range of the sensor is 0.3–11.3 mM. The sensor's sensitivity is 1000.3 μA mM −1 cm −2 , indicating its responsiveness to changes in analyte concentration. In electrochemical test systems, Signal-to-Noise Ratio (SNR) usually represents the relative intensity of the effective current signal and the background noise, reflecting the accuracy and reliability of the measurement. When the SNR is three, the minimum detection limit is 0.431 μM, highlighting its ability to reliably detect analytes at low concentrations amidst background noise. According to electrochemical workstation tests, the sensor demonstrates robust stability. Furthermore, the electrode material proves suitable for asymmetric supercapacitor devices, when the current density is 2 Ag −1 , the specific capacitance is 660.5 Fg −1 . At the same time, we also explore the cyclic stability of the device, which can retain 92.3 % of its initial specific capacitance after 5000 cycles, showing its remarkable long-term stability. In addition, the prepared nanocomposites can also light the red LED light. The results show that the synthesized CuO/Co 3 O 4 /r-GO/NF electrode can be used for electrochemical glucose sensing and supercapacitors, and plays an important role as a multi-functional material in the fields of medical, food, electronics, transportation and energy, providing key technical support for a variety of applications.
研究领域:
材料科学
·
医学
·
能源技术
✓ 已验证
产品关联
DOI
高影响因子
Catalysts
·
2025
·Vol. 15
·期 6
·538
·
IF 4
Jinlong Wen,Ziying Hu,Hongpeng Jia,Jing Chen,Can-Zhong Lu
The construction of multicomponent transition metal oxide catalysts can effectively increase the surface defects of catalysts, and bring a synergistic effect from different components, thus enhancing the generation of reactive oxygen species and improving the catalytic activity of catalysts for volatile organic compounds (VOCs) oxidation. In this article, CuO/Co3O4catalysts with abundant oxygen vacancies for the degradation of ethyl acetate was prepared by a simple impregnation method. The effect of the ratio of Co/Cu on the redox capacity, oxygen vacancy, active oxygen species and catalytic oxidation activity of ethyl acetate were studied. The 90% conversion and mineralization temperatures of ethyl acetate for the optimal catalyst Co3O4-20Cu are 211 and 214 °C (WHSV = 60,000 mL/(g·h), 1000 ppm ethyl acetate), which also shows good stability and excellent water vapor resistance. Compared with pure Co3O4, the CuO/Co3O4catalysts have more oxygen vacancies, provide more reactive oxygen species, allowing the catalyst better low-temperature reduction. Through in situ DRIFTS study, the intermediates of ethyl acetate decomposition were analyzed, then a possible catalytic oxidation mechanism of ethyl acetate on the Co3O4-20Cu catalyst was proposed. In addition, we prepared a Co3O4-20Cu/cordierite monolithic catalyst on the basis of Co3O4-20Cu, exhibiting a good catalytic activity in degradation of ethyl acetate.
研究领域:
催化化学
·
环境科学
·
材料化学
·
化学工程
·
表面化学
✓ 已验证
DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2019
·
IF 7.65
Wei Li,Yuxin Li,Deyun Zhang,Yeqing Lan,Jing Guo
CuO-Co 3 O 4 @CeO 2 nanoparticles used as a heterogeneous catalyst were prepared via a sol-gel method and characterized by various techniques. For comparison, a series of oxides was investigated for activating peroxymonosulfate (PMS) during the degradation of 2,4-dichlorophenoxyacetic acid (2,4-D). The results indicated that CuO-Co 3 O 4 @CeO 2 exhibited the highest catalytic performance among the catalysts. Complete degradation of 2,4-D (20 mg/L) was realized within 45 min at 1 mM PMS, CuO-Co 3 O 4 @CeO 2 loading of 0.07 g/L, and pH of 6. Recycling experiments confirmed that CuO-Co 3 O 4 @CeO 2 was very stable, and the 2,4-D degradation efficiencies ranged from 100% to 97.5%, decreasing by only 2.5% after the fifth run. The outstanding catalysis of CuO-Co 3 O 4 @CeO 2 resulted from the synergy of cerium, cobalt, and copper. Electron paramagnetic resonance and radical scavenger experiments confirmed the production of SO 4 • − and • OH radicals in the CuO-Co 3 O 4 @CeO 2 /PMS system, which were responsible for efficient decomposition of 2,4-D. Furthermore, the combination of CuO-Co 3 O 4 @CeO 2 andPMS was applied to treat natural water containing 2,4-D, and a high 2,4-D removal rate was also achieved. Based on these results, it was deduced that CuO-Co 3 O 4 @CeO 2 can be utilized as a catalyst to activate PMS and destroy organic contaminants in aqueous solution.
研究领域:
环境科学
·
催化
·
水处理
✓ 已验证
产品关联
DOI
PubMed
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2025
·
IF 21.1
Kexin Tian,Ye Liu,Yating Fu,Yi Ren,Chuanshu He,Zhaokun Xiong,Heng Zhang,Yang Liu,Jianping Zou,Jing Zhang,Bo Lai
A novel surface oxidation-dominated heterogeneous catalytic ozonation (HCO) process was developed to overcome matrix-induced scavenging limitations. By fabricating CuO-Co 3 O 4 heterojunction as catalyst, surface adsorbed hydroxyl radical (•OH ad ) and surface atomic oxygen ( ⁎ O ad ) emerge as primary reactive oxygen species (ROS) from ozone decomposition. The engineered catalyst achieves 4.3-fold and 1.9-fold higher oxalic acid degradation efficiency than CuO and Co 3 O 4 , respectively, accompanied by broad-spectrum mineralization for refractory pollutants and robust Cl⁻ resistance with verification in actual hypersaline industrial wastewater treatment. Combined characterization and theoretical calculations reveal that heterojunction formation increases Lewis acid sites and induces directional electron transfer from CuO to Co 3 O 4 , thereby lowering ozone activation barriers and accelerating surface-bound ROS generation, wherein O 3 is preferentially decomposed into •OH ad and ⁎ O ad at Co sites but only •OH ad at Cu sites. Collectively, this study advances a surface-bound ROS mediated catalytic ozonation paradigm with superior matrix resistance, enabling broader industrial deployment of HCO.
研究领域:
环境科学
·
催化
·
材料科学
·
化学工程
·
水处理
✓ 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）