CHEMICAL RESEARCH IN CHINESE UNIVERSITIES
·
2023
·
IF 3.1
Xiang Shuang,Guo Yong,Liu Xiaohui,Wang Yanqin
The interface between Au and support has attracted extensive interest because of its unique catalytic ability for hydrogen activation in catalytic hydrogenation/hydrogenolysis reactions. Herein, we create the Au-CoO-O V interface in the 1.0%Au/Co 3 O 4 -Rod-250 catalyst, which could dissociate H 2 via the heterolytic way to yield rich hydride species and achieve excellent catalytic performance in the hydrogenolysis of biomass-derived 5-hydroxymethylfurfural (HMF) to 2,5-dimethylfuran (DMF). The XRD and HRTEM analyses show that Au nanoparticles are uniformly dispersed on CoO-O V surface and in situ DRIFTS spectra show the enhancement of heterolytic dissociation of hydrogen (signals of Au—D and O—D vibration) compared with bare CoO (Co 3 O 4 -Rod-250). This work provides insights for fabricating highly active Au-support catalysts for catalytic hydrogenation/hydrogenolysis reactions.
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
SURFACE & COATINGS TECHNOLOGY
·
2024
·
IF 5.3
Dongqing Guo,Junhong Jia,Zongyu Zhang,Jie Yang,Jian Wang,Xiaoyu Jiao,Yun Shi,Leping Cai,Nairu He
In effort to reveal the high-temperature lubrication mechanisms of ternary oxides containing Mo/Co/Ni, the tribological characteristics of atmospheric plasma sprayed (APS) NiCrAlY-MoO 3 /CoO composite coatings at elevated temperatures were investigated. The high-temperature lubrication mechanisms of Co/Ni-molybdate formed on worn surfaces were analyzed through experimental analysis and density functional theory (DFT) calculations. The results demonstrate that the coefficient of friction (COF) of NiCrAlY coating after 30 % MoO 3 /CoO added decreased from 0.43 to 0.30 and the wear rate reduced from 5.00 × 10 −5 to 8.32 × 10 −6 mm 3 N −1 m −1 at 800 °C. This is ascribed to the synergistic lubrication effects of the layer crystal structured ternary oxides CoMoO 4 and NiMoO 4 , which are self-generated through tribo-chemical reactions on the worn surface at elevated temperatures. DFT calculations show that the binding energies of Co O (−1.05 eV) and Ni O (−0.61 eV) in the detected ternary oxides CoMoO 4 and NiMoO 4 are weaker than those of the corresponding bonds in binary oxides CoO (−1.99 eV) and NiO (−1.44 eV), and have potential to break more easily at high temperatures. Such layered structures with easy-to-break bonds of the ternary oxides containing Mo/Co/Ni provides excellent lubrication properties in the composite coatings.
研究领域:
材料科学
·
表面工程
·
计算化学
✓ 已验证
产品关联
DOI
高影响因子
CHINESE JOURNAL OF CATALYSIS
·
2023
·
IF 16.5
Wanjun Guo,Zhi-Qiang Wang,Shuang Xiang,Yaxuan Jing,Xiaohui Liu,Yong Guo,Xue-Qing Gong,Yanqin Wang
ABSTRACT Owing to the wide application of primary amines, their selective production via reductive amination has become a crucial research topic. Various metal-supported catalysts (Pt, Ru, Rh, Ir, Co, Ni, etc. ) have been investigated, and metallic species have been recognized as active sites in recent years. Herein, we reveal for the first time that CoO species containing oxygen vacancies within a core-shell-structured Co@CoO catalyst accelerate the ammonolysis of Schiff bases, key intermediates in reductive amination, through NH 3 dissociation to hydride-like NH 2 δ – species, delivering an excellent reductive amination performance. The catalyst is highly stable and was utilized in 10 catalytic cycles for the amination of biomass-derived cyclopentanone (CPO) to cyclopentylamine (CPA) without deactivation. Various computational models in combination with spectroscopic measurements indicated that this catalyst not only drives the dissociation of H 2 to the active H δ – species, but also enables the homolytic cleavage of NH 3 to NH 2 δ – . D 2 isotopic tracing experiments provided further evidence of the direct involvement of hydride-like NH 2 δ – species in Schiff base ammonolysis. Theoretical calculations verified the stable co-adsorption of H δ – and NH 2 δ – , which allows the Schiff base to move freely on the surface of the CoO shell and participate extensively in molecular collisions, resulting in exceptional catalytic activity. This is the first study that demonstrates the potential of metal oxide catalysts for the production of primary amines via reductive amination.
研究领域:
催化
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化学工程
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材料科学
·
物理化学
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2021
·
IF 5.316
Xiaoming Fan,Yuyin Fan,Xiao Zhang,Lin Tang,Jinxue Guo
Heterostructured materials favoring synergism, efficient charge transfer, and abundant active sites have aroused enormous interests for water electrolysis. Here heterogeneous Co@CoO encapsulated in P, N co-doped carbon nanofibers supported on carbon cloth (Co@CoO-PNC/CC) has been prepared to pursue attractive synergism for the application of pH-tolerant catalyst for oxygen evolution reaction (OER) in both alkaline and neutral solutions. The prepared Co@CoO-PNC/CC exhibits advanced OER performances, generating a current density of 10 mA cm −2 at overpotential of 289 mV in alkaline media and 371 mV in neutral media. The high OER activity can be assigned to the synergistic effect of abundant active sites and enhanced charge transfer between Co and CoO, as well as the specific P, N co-doped carbon nanofiber architecture.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
Interdisciplinary Materials
·
2024
·
IF 24.5
Bin Fan,Weikun Chen,Kaining Li,Qingya Wei,Qian He,Wei Liu,Bigui Zhou,Jun Yuan,Yingping Zou
The shuttle effect of lithium polysulfides (LiPSs) and their sluggish kinetic processes lead to rapid capacity fading and poor cycling stability in lithium–sulfur (Li–S) batteries, limiting their commercial viability. This study proposes a functionalized separator with adsorption and synergistic catalysis ability for Li–S batteries. The modified separator comprises Ti 3 C 2 T x sheets, CoO, and MoO 3 . Experimental and theoretical calculations demonstrate that Ti 3 C 2 T x /CoO/MoO 3 composite not only effectively inhibits the shuttle effect of LiPSs, ensuring efficient utilization of active materials, but also enhances reversibility and reaction kinetics among LiPSs. The full exposure of active sites in the Ti 3 C 2 T x /CoO/MoO 3 composite and the synergistic action of different catalysts enable efficient capture and conversion of LiPSs molecules at the material surface. Besides, the lithium–sulfur batteries with Ti 3 C 2 T x /CoO/MoO 3 @PP separator exhibited only a 0.042% capacity decay per cycle at 0.5 C (800 cycles). Moreover, a high areal capacity of 6.85 mAh cm −2 was achieved at high sulfur loading (7.9 mg cm −2 ) and low electrolyte-to-sulfur ratio (10 μL mg −1 ).
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
NANO
·
2020
·
IF 1.566
Ying Meng,Shibin Lu,Yaodong Wu,Zhenfa Zi,Yuan Ma,Haisheng Lu,Xuemei Chen,Ziwen Song
In this study, we have successfully synthesized porous CoO–Co@RGO composites using GO and Co-based metal-organic frameworks (MOFs) as precursors. Due to particular structures and advantageous characteristics, the synthesized porous CoO–Co@RGO composites exhibit outstanding electromagnetic (EM) wave absorbing properties with a filler loading of 10 wt.% in wax matrix. The maximum reflection loss (RL) of the prepared porous CoO–Co@RGO was − 3 4 . 2 2 dB with 2.1 mm thickness, and the effective absorption bandwidth as wide as 6.24 GHz (11.76–18 GHz), which covers the full Ku-band. Remarkably, the achieved all values of RL were under − 1 0 dB with 1.0–5.0 mm thickness, the corresponding to bandwidth range can be tuned to 13.84 GHz (4.16–18 GHz). The superior absorbing performance is attributed to suitable magnetic loss, high dielectric loss and large attenuation mainly caused by conduction loss and polarization relaxation.
研究领域:
材料科学
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电磁学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Tianyu Gong,Jinyang Zhang,Yang Liu,Linrui Hou,Jianlin Deng,Changzhou Yuan
It is an enormous challenge to develop low-cost non-noble metal bi-functional catalysts toward overall water splitting. The efficient water decomposition electrocatalysts need both intrinsic activities determined by electronic structure and superb mass transfer ability. For this, in the contribution, an efficient self-supported bi-functional catalyst, i.e. , nanoscale hetero Mo 2 C-CoO encapsulated in N -doped carbon nanofibers (Mo 2 C-CoO@ N -CNFs), is designed and fabricated with facile electrospinning avenue. Density functional theory and electrochemical investigation manifest that the synergistic effect of bimetallic Mo/Co accelerates kinetics of hydrogen evolution reaction (HER) and lowers the energy barrier of oxygen evolution reaction (OER). Thanks to the structural and compositional merits, the optimized integrated Mo 2 C-CoO@ N -CNFs film demonstrates remarkable catalytic activities in both OER and HER, and renders a current density of 10 mA cm −2 at 1.56 V when used for alkaline whole water cracking. The design concept here provides insights for future rational construction of advanced water decomposition catalysts.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2021
·
IF 9.229
Wenliang Feng,Venkata Sai Avvaru,Rudi Ruben Maça,Steven J. Hinder,Miguel Castillo Rodríguez,Vinodkumar Etacheri
Sodium-ion hybrid capacitors (SHCs) have attracted great attention owing to the improved power density and cycling stability in comparison with sodium-ion batteries. Nevertheless, the energy density (<100 Wh·kg–1) is usually limited by low specific capacity anodes (<150 mAh·g–1) and “kinetics mismatch” between the electrodes. Hence, we report a high energy density (153 Wh·kg–1) SHC based on a highly pseudocapacitive interface-engineered 3D-CoO-NrGO anode. This high-performance anode (445 mAh·g–1 @0.025 A·g–1, 135 mAh·g–1 @5.0 A·g–1) consists of CoO (∼6 nm) nanoparticles chemically bonded to the NrGO network through Co–O–C bonds. Exceptional pseudocapacitive charge storage (up to ∼81%) and capacity retention (∼80% after 5000 cycles) are also identified for this SHC. Excellent performance of the 3D-CoO-NrGO anode and SHC is owing to the synergistic effect of the CoO conversion reaction and pseudocapacitive sodium-ion storage induced by numerous Na2O/Co/NrGO nanointerfaces. Co–O–C bonds and the 3D microstructure facilitating efficient strain relaxation and charge-transfer correspondingly are also identified as vital factors accountable for the excellent electrochemical performance. The interface-engineering strategy demonstrated provides opportunities to design high-performance transition metal oxide-based anodes for advanced SHCs.
研究领域:
能源存储
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材料科学
·
电化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
BIOMATERIALS
·
2020
·
IF 10.317
Shiyan Fu,Ruihao Yang,Lei Zhang,Weiwei Liu,Guangyuan Du,Yang Cao,Zhigang Xu,Hongjuan Cui,Yuejun Kang,Peng Xue
Chemodynamic therapy (CDT), an emerging therapeutic strategy, has been recently exploited for in situ treatment through Fenton or Fenton-like reactions to generate cytotoxic reactive oxygen species (ROS). However, current systems rely significantly on the high local oxygen levels and strongly acidic conditions (pH = 3.0–5.0). Simultaneously, the produced ROS can be rapidly consumed by intracellular glutathione (GSH) in the electron transport chain. Herein, an original and biomimetic [email protected] nanocatalyst was prepared based on the assembly of Au and Pt nanoparticles (NPs) on the surface of hollow CoO nanocapsules . The as-synthesized nanozyme exhibits extremely high stability under physiological conditions , whereas it undergoes spontaneous disintegration in the unique tumor microenvironment (TME). Subsequently, the decomposition products can catalyze a cascade of biochemical reactions to produce abundant ROS without any external stimuli. Thus, the present nanoplatform can increase intracellular ROS levels through continuous supply of H 2 O 2 , relief of local hypoxia and depletion of GSH, which result in remarkable and specific tumor damage both in vitro and in vivo . The findings of this study highlight the promising potential of [email protected] nanocatalyst as a TME-responsive CDT nanomagnet for highly efficient tumor therapy.
研究领域:
纳米技术
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癌症治疗
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生物医学工程
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材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Sustainable Chemistry & Engineering
·
2024
·
IF 7.1
Qiang Wang,Lina Kong,Jianping Xu,Baozeng Zhou,Xiaofan Liu,Ziyu Lin,Shaobo Shi,Xiaosong Zhang,Lan Li
The construction of efficient and nonprecious cocatalysts, along with the establishment of rapid interfacial charge migration pathways to host semiconductors, is a major process in enhancing photocatalytic water splitting performance and remains a formidable challenge. Herein, the composition of CoP/CoO cocatalysts on g-C3N4 is regulated through phosphating for efficient and stable H2 evolution. Comprehensive analyses reveal that the CoO nanocrystals, possessing a bandgap of 1.95 eV, are uniformly loaded onto g-C3N4 with a portion undergoing an in situ transformation to metallic CoP, thereby forming a well-defined interfacial energy level structure for carrier separation. Moreover, the CoP/CoO cocatalysts exhibited a lower hydrogen adsorption Gibbs free energy (ΔGH) than that of the mono CoP or CoO. The optimal CoP/CoO/g-C3N4 exhibits an attractive and stable rate of solar-driven H2 evolution at 0.86 mmol·g–1·h–1, surpassing the rates of CoO/g-C3N4 and Pt/g-C3N4 by 30 and 1.5 times, respectively. The dual-driven interfaces of CoP/CoO/g-C3N4 provide a 2-fold acceleration for directional carrier transfer, in conjunction with accelerated surface reaction kinetics, resulting in efficient and stable H2 evolution. This scalable strategy, focusing interfacial engineering for rapid carrier transfer, offers a novel perspective in the design of highly active cocatalysts to boost the photocatalytic application.
研究领域:
材料科学
·
催化化学
·
能源科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF POWER SOURCES
·
2024
·
IF 8.1
Hao Song,Xue Liu,Jie Song,Zhuang Shi,Zhen Fu,Hao Feng,Hongyan Zhuo,Wenmiao Chen,Yanli Chen
The intrinsic activity and full exposure of active sites play important roles in high performance electrocatalytic reactions. Herein, a novel "secondary template strategy" is reported, for first time, to synthesize a hierarchical porous carbon-based catalyst loaded by single-atomic FeN x and CoO nanoparticles (CoO@Fe-NC ZnO ) from well-defined ZnO-Fe-PPY precursor, in which the PPY (polypyrrole) in-situ grown on the surface of the ZnO templates followed by the outer coating of FeCl 3 . The utilization of ZnO templates involve their decomposition during the pyrolysis process, leading to the porous structures of the resulted Fe-NC ZnO . Simultaneously, the pyrolysis products of FeCl 3 (Fe/Fe 3 O 4 ) can gradually formed in the remaining parts of the decomposed ZnO, effectively preventing the collapse of the porous structures (so-called secondary template strategy). Subsequently, the introduction of CoO further enhances the intrinsic activity of the as-prepared CoO@Fe-NC ZnO for oxygen reduction reaction (ORR) and oxygen evolution reaction (OER), respectively, with an excellent half-wave potential (E 1/2 ) of 0.917 V (vs. RHE) and a low potential of 1.556 V (vs. RHE) at a current density of 10 mA cm −2 (E 10 ). Meanwhile, zinc-air batteries assembled with CoO@Fe-NC ZnO catalyst have great application potential. This work provides a pathway for the preparation of bifunctional electrocatalysts with a hierarchical porous structure.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
Chemistry-An Asian Journal
·
2023
·Vol. 19
·期 2
·e202300951
·
IF 4.1
Pengkun Xia,Jing Pan,Yue Zhang,Mingzhen Mao,Lei Ma,Jianlin Chen,Long Zhang,Hui Wang,Hui Fan,Xiaohui Gao,Lianwen Deng
Graphical Mo−CoO nanosheets grown on nickel foam was used as a non-enzymatic glucose sensing electrode with a high sensitivity (89.3 mA cm −2 mM −1 ) and a low detection limit (0.43 μM). DFT calculations results confirmed that the lower adsorption free energy (−1.79 eV) for glucose adsorbing on Mo−CoO-1 surface promoted the glucose electrochemical oxidation reaction and then enhanced the sensing performance. In this work, a Mo doped CoO nanosheet grown on nickel foam (labeled as: Mo−CoO) with defect-rich and improved electron transfer capacity was designed to be used as a novel non-enzyme electrode material. Physical characterizations demonstrated the Mo elements were doped inside of the samples and they were mutually stabilized with each other, resulting in a high structural stability electrochemical catalytical activity even if the content of Mo was low. For non-enzymatic glucose electrochemical sensing, the prepared Mo−CoO-1 showed a remarkable sensitivity of 89.3 mA cm −2 mM −1 , and a low detection limit of 0.43 μM. Density functional theory (DFT) studies revealed that the doped Mo atom exhibited a higher d-band center compared to the Co atom. A stronger p-d orbital hybridization between the glucose and the Mo atoms indicated the enhancement of glucose adsorption and activation. Importantly, Mo−CoO-1 provided a good selectivity and long-term stability, which can be expected to be used in future practical applications.
研究领域:
材料科学
·
生物医学工程
·
电化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）