Journal of Energy Storage
·
2023
·
IF 9.4
Tingting Dai,Xuesong Li,Liying Wang,Xijia Yang,Yang Gao,Qixian Zhang,Wei Lü
Ni-Co-O material is the most representative polymetallic compound and has exhibited excellent energy storage properties. However, the high cost of composite restricts the practical application of Ni-Co-O material. In this paper, a simple and low-cost method is used to grow Ni-Co-O/C nanoarrays directly on a conductive matrix. The results show that the three-dimensional nanoflower-like Ni-Co-O/C composite has better electrochemical performance than that of the nanosheet Co-O/C binary composite. This microstructure provides a shorter path for electron transport, making the material high electron transport efficiency. The specific capacitance of Ni-Co-O/C/AC asymmetric supercapacitor can reach 128.75 mF cm −2 at 2 mA cm −2 . Under the condition of 20 mA cm −2 , after 4000 cycles of charge and discharge, the capacitance retention rate is maintained at 99.8 %. This 3D flower-like structure not only helps provide an open framework and rapid ion diffusion, but also exposes more active sites and enhances charge storage performance. Ni-Co-O/C calcined in nitrogen shows more abundant defect structure and larger specific surface area, which is further conducive to Ni-Co-O/C electrodes to expose more active sites and enhance the rapid diffusion and reaction of electrolyte ions .
研究领域:
材料科学
·
能源存储
✓ 已验证
产品关联
DOI
高影响因子
POLYMER DEGRADATION AND STABILITY
·
2024
·
IF 6.3
Yingbing Zou,Kui Niu,Fubin Luo,Hongzhou Li
The development of metal oxide flame retardants that are easy to synthesize, efficient, and recyclable would be more beneficial to circular economy. In this work, a porous core-shell Mn 3 CoO x was developed to efficiently reduce heat, smoke as well as hazardous gas during the combustion of epoxy resin (EP). Compared with pure EP, the peak heat release rate (pHRR), total heat release (THR), peak smoke production rate (pSPR), total smoke production (TSP), peak CO production rate (pCOPR), and peak CO 2 production rate (pCO 2 PR) of EP/Mn 3 CoO x are reduced by 47.5 %, 21.5 %, 34.6 %, 17.6 %, 58.6 %, and 55.4 %, respectively. It has been shown that Mn 3 CoO x not only catalyzes the formation of high-quality char layer but also effectively catalyzes the conversion of hazardous gas products into CO 2 . Recovery experiments of Mn 3 CoO x filler in EP composites show that the recovery of Mn 3 CoO x can reach 90.0 %. This work provides insights into the design of efficient metal oxide flame retardants and ideas for the development of recycled flame retardants.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2023
·
IF 9.5
Meilan Pan,Xue Zhang,Chenglei Pan,Jiong Wang,Bingjun Pan
Strategies for harmonizing the construction of an active site and the building of electron transport for a hybrid MoS2 catalyst are crucial for its application in electrochemical reactions. In this work, an accurate and facile hydrothermal strategy was proposed to fabricate the active center of Co–O–Mo on a supported MoS2 catalyst by forming a CoMoSO phase on the edge of MoS2, yielding (Co–O)x-MoSy (x = 0, 0.3, 0.6, 1, 1.5, or 2.1). The results show that the electrochemical performances (hydrogen evolution reaction (HER), oxygen evolution reaction (OER), and electrochemical degradation) of the yielded MoS2-based catalysts were positively correlated with the Co–O bonds, verifying the significant role of Co–O–Mo as the active center. The fabricated (Co–O)-MoS0.9 presented an extremely low overpotential and Tafel slope in both HER and OER, and it also demonstrated excellent BPA removal in the electrochemical degradation reaction. As compared with the Co–Mo–S configuration, the configuration of Co–O–Mo not only serves as the active center but also provides a conducting channel to facilitate electron conductivity with more accessible charge transfer at the electrode/electrolyte interface, which is favorable for electrocatalytic reaction. This work offers a new perspective for the active mechanism of metallic-heteroatom-dopant electrocatalysts and further boosts research on the development of noble/non-noble hybrid electrocatalysts in the future.
研究领域:
电化学
·
材料科学
·
催化
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CATALYSIS TODAY
·
2019
·
IF 4.888
Tianyu Gao,Yongxuan Yin,Guanghui Zhu,Qiue Cao,Wenhao Fang
Oxidative transformations of HMF are key routes toward a wide variety of chemicals and biofuels through an environmental friendly process. Co 3 O 4 NPs decorated Mn-Co-O solid solution, donated as Co 3 O 4 /Mn X Co, was prepared by co-precipitation method and used as non-precious metal catalyst for base-free oxidation of HMF to FDCA in the presence of O 2 and water. Comprehensive characterizations such as XRD, H 2 -TPR, O 2 -TPD, XPS, NH 3 /CO 2 -TPD and TEM were used to study materials properties especially the oxygen mobility and acidity-basicity. The effect of Mn/Co molar ratio in catalyst and the reaction conditions were investigated and optimized. In addition, the kinetics of the reaction was monitored to reveal the reaction route and rate-determining step. The variation of Mn/Co molar ratio was found to affect not only HMF conversion but also distribution of products. When the Mn/Co ratio was of 0.2, the Co 3 O 4 /Mn 0.2 Co catalyst showed the optimal catalytic performance (i.e., >99% yield of FDCA obtained under 1 bar O 2 at 140 °C after 24 h) due to the highest content of both Lewis and Brønsted acid sites on the surface, leading to the strongest ability of HMF adsorption and COOH group formation, as well as the enhanced oxygen mobility. This catalyst was shown stable after a minor deactivation (≤8%) during six recycling uses and its activity can be entirely regenerated by calcination in air.
研究领域:
催化化学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry A
·
2024
·Vol. 12
·期 21
·12712-12720
·
IF 10.7
Tianhao Yu,Peng Gao,Hong Du,Ling Dong
Metal–organic frameworks (MOFs) have recently been reported as promising catalysts for the oxygen evolution reaction (OER). Hence, we chose hydroxyl-rich 2,5-dihydroxyterephthalic acid as the ligand to prepare a novel MIL-100 and wrapped it on the NiCo-ZIF-67 surface to obtain an amorphous hollow material (NiCo-ZIF-67@Fe-MIL-100, denoted as NiCo-ZIF@MIL). The composite material presents a low overpotential (η ≈ 139 mV @ 10 mA cm−2), a small Tafel slope (119 mV dec−1) and great stability for the OER in 1 M KOH solution. Density Functional Theory (DFT) calculations show that the hydroxyl-rich structure, which accelerates OH− transfer and promotes the formation of the Co–O–Fe bridge, effectively reduces the reaction energy barrier (from 2.67 eV for NiCo-ZIF-67 to 2.08 eV for NiCo-ZIF@MIL). This work provides an important reference for the development of double-MOF materials.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Water Process Engineering
·
2025
·
IF 6.7
Weibao Liu,Shengwen Zhou,Wen Xu,Jiangwei Shang,Ming Yi,Xiuwen Cheng
The advancement of environmentally friendly, cost-effective and efficient persulfate catalysts represents a pivotal step in the evolution of advanced oxidation technology involving persulfate. In this study, manganese sand composites modified with Co 3 O 4 quantum dots were prepared by isovolumetric impregnation and employed to activate persulfate (PMS) for levofloxacin (LVF) degradation. The resulting materials were characterized, and the results demonstrated that the Co 3 O 4 quantum dots enhanced the electron transfer ability of the materials, which in turn improved the catalytic ability. The degradation rate of levofloxacin was 99 % within 60 min, and the total organic carbon mineralization rate was 46 % at dosages of 0.4 g/L and 0.3 g/L of catalyst and PMS, respectively. The results of probe experiments demonstrated that •OH, SO 4 •- , and non-radicals were responsible for 11.8 %, 6.6 % and 81.6 % of the observed degradation, respectively. Potential degradation pathways of levofloxacin were proposed based on HPLC-MS and Fukui index analysis, and the toxicity changes of the degradation products were investigated. Cycling experiments and ionic dissolution tests demonstrated the stability of the material, which exhibited 94 % degradation and a markedly reduced ionic dissolution at the fifth cycle. Subsequently, the Co 3 O 4 quantum dots‑manganese sand composite system was evaluated in extended continuous flow device experiments for the treatment of real medical wastewater. The mineralization rate of the medical wastewater was 77 % in 48 h of operation, demonstrating the feasibility of the reaction system for the treatment of real medical wastewater and providing technical references for the future treatment of difficult-to-degrade organic wastewater.
研究领域:
环境科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2025
·
IF 7.7
Ziwen Yao,Jing Li,Shuai Nie,Yuan Wang,Xitao Yin,Yunxia He
Utilizing p-n composite materials for the fabrication of metal-oxide semiconductor (MOS) gas sensors represents a promising strategy to achieve exceptional selectivity in detecting reducing gases such as hydrogen (H₂) and carbon monoxide (CO). However, previous studies have typically achieved this selectivity under fixed operating temperatures and single molar ratios. This study presents the successful synthesis of n-In₂O₃/p-Co₃O₄ nanoparticles, featuring a p-n heterojunction structure, using a simple composite preparation method. The gas-sensing properties, crystal structure, morphology, and chemical states were comprehensively characterized using an electrochemical workstation, XRD, TEM, HRTEM, and XPS. Experimental results show that the gas sensor responses of the n-In₂O₃/p-xCo₃O₄ composites (with x = 10.5, 15, 18, 21), annealed at 500°C within an operational temperature range of 350°C to 400°C, exhibit distinct behaviors for CO and H₂ gases. This addresses the challenge of achieving selective detection across varying conditions. Notably, the n-In₂O₃/p-18Co₃O₄ composites display opposing response characteristics for both gases across a broad temperature range of 200°C to 400°C. At 350°C, the n-In₂O₃/p-18Co₃O₄ sensor demonstrates optimal selectivity, significantly minimizing cross-sensitivity and improving detection accuracy and reliability. The sensor also shows excellent stability, with consistent responses under repetitive exposure conditions. By improving both sensor selectivity and stability, this research advances gas detection technologies, with potential applications in sustainable energy and public health monitoring.
研究领域:
材料科学
·
传感器技术
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
CHINESE JOURNAL OF CATALYSIS
·
2025
·
IF 17.7
Zhouzhou Wang,Qiancheng Zhou,Li Luo,Yaran Shi,Haoran Li,Chunchun Wang,Kesheng Lin,Chengsi Wang,Libing Zhu,Linyun Han,Zhuo Xing,Ying Yu
Neutral oxygen evolution reaction (OER) is a crucial half-reaction for electrocatalytic chemical production under mild condition, but with limited development due to low activity and poor stability. Herein, a tungsten-doped cobalt molybdate (WDCMO) catalyst was synthesized for efficient and durable OER under neutral electrolyte. It is demonstrated that catalyst reconstruction is suppressed by W doping, which stabilizes the Co-O-Mo point-to-point connection in CoMoO 4 architecture and stimulates to a lower valence state of active sites over the surface phase. Thereby, the surface structure maintains to avoid compound dissolution caused by over-oxidation during OER. Meanwhile, the WDCMO catalyst promotes charge transfer and optimizes *OH intermediate adsorption, which improves reaction kinetics and intrinsic activity. Consequently, the WDCMO electrode exhibits an overpotential of 302 mV at 10 mA cm –2 in neutral electrolyte with an improvement of 182 mV compared with CoMoO 4 electrode. Furthermore, W doping significantly improves the electrode stability from 50 h to more than 320 h, with a suppressive potential attenuation from 2.82 to 0.29 mV h –1 . This work will shed new light on designing rational electrocatalysts for neutral OER.
研究领域:
电化学
·
催化
·
材料科学
·
能量转换
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Cong Yuan,Xiaoxiao Zhu,Jiaqi Pan,Minghao Xu,Yongjun Jiang,Sheng Dai,Yikai Huang,Leixi Lu,Lei Zhou,Chengcheng Tian
The understanding of how single atoms anchoring on oxides contribute to high-activity catalysis in the sulfate radical-advanced oxidation process (SR-AOP) remains obscure. Here we presented a new strategy for regulating singlet oxygen ( 1 O 2 ) generation in peroxymonosulfate-based advanced oxidation processes (PMS-AOPs) by engineering the Co-O-X active sites on oxide supports in this study. The Co single atoms supported on mesoporous oxides (Co SA -XO 2 ) were first successfully developed using a modified sol–gel solvent vaporization self-assembly method. We found that Co SA -XO 2 catalysts served as efficient PMS activators for pollutant decomposition over a wide pH range. Notably, Co SA -TiO 2 exhibited exceptional performance, achieving nearly 100% removal of sulfasalazine (SSZ) within 10 min. Furthermore, evidenced by experimental results and density functional theory (DFT) calculations, 1 O 2 was confirmed to be predominately active oxidizing species by the unique Co-O-X bonds for activating PMS in Co SA -XO 2 /PMS system, resulting in an excellent pollution degradation. This study provides valuable insights into the construction of highly loaded single-atom catalysts using oxide substrates in the PMS-AOP system, along with the mechanism of regulating reactive oxygen species (ROS) formation through interfacial bonding between active metal and support.
研究领域:
催化
·
环境科学
·
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2022
·
IF 7.139
Dengyu Fu,Yanji Zhu,Lei Chen,Yue Sun,Meng Zhang,Huaiyuan Wang
Heteroatom modified catalyst applying for the two-electron oxygen reduction reaction has the potential application for efficient on-site production of H 2 O 2 . At present, state of the art catalyst synthesis is often energy-intensive and tends to destroy the original structure of heteroatoms. Based on the above considerations, Co-O, pyrrolic N structures co-modified graphite felt catalyst (Co-PDA-GF) is successfully synthesized by a simple two-step electrochemical method . Interestingly, the introduction of Co 2+ during the dopamine (DA) polymerization process changes the surface morphology of GF from a “thin-film” like to an “ant-nest” like. The cumulative H 2 O 2 concentration achieves 421 mg L −1 in 6 h test time, which is 16 times higher than that of R-GF, and the Methylene blue (MB) in-situ removal rate reaches 97.2% within 3 h. The enhanced H 2 O 2 yield of Co-PDA-GF catalyst is attributed to the increased oxygen-containing functional groups (-COOH, -C-O-C) and defect structures , and most importantly, Co-O and pyrrolic N synergistic modulation effects on local electronic modulation. This work provides new insights on DA polymerization morphology control and designing of high-efficient 2e − ORR catalyst with a low-energy method.
研究领域:
电化学
·
材料科学
·
催化
·
环境化学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Energy Storage
·
2025
·
IF 9.8
Jin-hua Zhang,Peng-jie Zhu,Yan-zhen Liu,Xiang-ru Zhu,Yong-feng Li,Cheng-Meng Chen
The construction of heterostructured energy storage and conversion with special morphology has the potential to be an up-and-coming area of research. In this study, we designed and synthesized a Co₃O₄/g-C₃N₄ heterostructured electrode material with a distinctive morphology using a multistep fabrication approach. The heterojunction formed between Co₃O₄ and g-C₃N₄ induces interfacial charge redistribution, resulting in a built-in electric field that facilitates efficient electron transfer and enhances the electronic structure. Furthermore, the engineered morphology, comprising nanocages and hollow tubes, significantly increases the number of electrochemically active sites. The optimized electrode achieved an impressive specific capacity of 921.8 F g −1 at a current density of 1 A g −1 , along with excellent cycling stability, retaining 82.88 % of its initial capacity after 10,000 cycles. Moreover, an asymmetric supercapacitor constructed with Co₃O₄/g-C₃N₄ as the positive electrode and activated carbon as the negative electrode demonstrated a stable and high energy density of 36.3 Wh kg −1 .
研究领域:
材料科学
·
能源存储与转换
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Wei-Xiao Li,Meng-Jiao Liu,Xiao-Yuan Wu,Sa-Sa Wang,Weiming Wu,Can-Zhong Lu
Porous Ni 2+ -doped Co 3 O 4 nanosheets were prepared by a combination method of electrodeposition and post-calcination. The catalytic activities of the as-prepared samples for the electrocatalytic nitrate reduction to ammonia were evaluated. It was found that the Ni 2+ -doped Co 3 O 4 sample with a Ni 2+ doping content of 20 % exhibited higher catalytic activity as compared with other samples. The outstanding catalytic activity of the 20 % Ni 2+ -doped Co 3 O 4 sample could be attributed to its porous nanosheet structure with rich oxygen vacancies, which was confirmed by SEM, XPS, TEM, EPR and operando EIS analyses. The DFT results further revealed that the increased hydrogen generation energy and nitrate adsorption, and the diminished rate-determining step energy barrier ensured Ni 2+ -doped Co 3 O 4 exhibited outstanding activity for the electrocatalytic nitrate reduction. Moreover, membrane-less electrocatalytic nitrate reduction was coupled with methanol oxidation by using the oxygen vacancies-rich Co 3 O 4 electrocatalyst. The Faradic efficiencies for the electroreduction of nitrate to ammonia and the electrooxidation of methanol to formate could keep at 98 % and 99 % after multiple cycles, respectively, revealing a good stability of the reported hybrid system for the membrane-less electrocatalytic ammonia synthesis.
研究领域:
材料科学
·
电化学
·
催化化学
✓ 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）