CHINESE JOURNAL OF CATALYSIS
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2025
·
IF 17.7
Liang Zhang,Jialiang Rui,Yiqian Li,Zhizhi Yang,Shiro Kubuki,Junhu Wang,Bofan Zhang
Precise manipulation of the catalytic spin configuration and delineation of the relationship between spin related properties and oxidation pathways remain significant challenges in Fenton-like processes. Herein, encapsulated cobalt nanoparticles and cobalt-nitrogen-doped carbon moieties, endowed with confinement effects and variations in shell curvature were constructed via straightforward pyrolysis strategies, inducing alterations in magnetic anisotropy, electronic energy levels and spin polarization. The enhanced spin polarization at cobalt sites leads to a reduction in crystal field splitting energy and an increase in electronic spin density. This phenomenon facilitated electron transfer from cobalt orbitals to p z orbitals of oxygen species within peroxymonosulfate molecules, thereby promoting the formation of high-valent cobalt species. The encapsulation effectively stabilized cobalt nanoparticles, mitigating their dissolution or deactivation during reactions, which in turn enhances stability and durability in continuous flow processes. The high-valent cobalt species within the shell exhibit increased exposure and generate localized high concentrations, thereby intensifying interactions with migrating pollutants and enabling efficient and selective oxidation of emerging compounds with elevated redox potentials. This work underscores the profound impact of confined encapsulation curvature and spin polarization characteristics of metal sites on catalytic oxidation pathways and performance, opening novel avenues for spin engineering in practical environmental catalysis.
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Sustainable Energy & Fuels
·
2019
·Vol. 4
·期 4
·1654-1664
·
IF 4.912
Caiyun Wu,Yunmei Du,Yunlei Fu,Di Feng,Hui Li,Zhenyu Xiao,Yanru Liu,Yu Yang,Lei Wang
In this study, a composite of Mo, Co co-doped NiS bulks grown on an Ni foam (Mo,Co-NiS/NF) was synthesized as a bi-functional electrocatalyst for hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) using a simple method. The existence of ZIF-67 and Mo ensure the even distribution of Co and Mo elements and the formation of N doped carbon layer in Mo, Co-NiS/NF. Mo, Co co-doping and NF support greatly improved the electrocatalytic performance of NiS bulks, because metal element doping could improve the intrinsic activity and electrical conductivity. Moreover, the Ni foam could act as a substrate to avoid aggregation and provide nickel source to form the bimetallic sulfide. The product Mo,Co-NiS/NF-400 showed outstanding electrochemical properties, with ultralow overpotential (92 mV vs. RHE) for HER and ultralow overpotential (117.2 mV vs. RHE) for OER to achieve 10 mA cm−2, as well as the ultralow cell voltage (1.36 V) to achieve 20 mA cm−2 for overall water splitting. This study provides an available method to promote the electrocatalytic activity of the traditional monometallic sulfides for overall water splitting.
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SENSORS AND ACTUATORS B-CHEMICAL
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2025
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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.
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NEW JOURNAL OF CHEMISTRY
·
2025
·
IF 2.5
Danli Tang,Dengjie Zhong,Yongxian Zhou,Yunlan Xu,Tanxia Xiang,Wantao Li,Yuanfang Yang,Chunmiao Fan,Jisai Chen
Dye pollution has caused great harm to the ecological environment. In this paper, N and S co-doped biochar (K-NSBC) was obtained by a calcination–alkali activation method, then Co/Al layered double hydroxide (Co/Al-LDH) was anchored on it by a co-precipitation method to activate ozone (O3) to degrade methylene blue (MB). When the O3 concentration was 3.12 mg L−1, catalyst dosage was 0.6 g L−1, the MB concentration was 25 mg L−1, and pH was 6.8, the degradation efficiency of MB reached 99.65%. The degradation efficiency still remained at 92.75% even after Co/Al-LDH@K-NSBC was recycled five times. The results of material characterization and quenching experiments show that the presence of oxygen vacancies (Ov) on the metal surface not only accelerates the exchange of oxygen and the generation of active free radicals, but also promotes the conversion of Co3+/Co2+ and the activation of O3. Pyridine N, graphite N and thiophene S provide electron-rich groups, which promote the activation of O3 to produce reactive oxygen species (ROS). Among them, 1O2 is the main ROS leading to the degradation of MB, and its intermediates ˙OH and ˙O2− also participate in the oxidation of MB. This study is expected to provide new ideas and directions for the design of highly efficient and stable ozonation activators and industrialization of non-phase catalytic ozonation degradation of dye wastewater.
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International Journal of Bioprinting
·
2021
·
IF 6.638
Yang Zhou,Yuecheng Cui,Li-Qun Wang
The thermo-sensitive hydrogel formed by triblock copolymers of polyethylene glycols and aliphatic polyesters serves as a promising candidate for bioink due to its excellent biodegradability and biocompatibility. However, the thermo-crosslinking alone cannot achieve a robust hydrogel to support the 3D printed constructs without collapse. Herein, a photo-crosslinkable group was introduced into the triblock copolymers to achieve a dual-sensitive hydrogel. A triblock copolymer poly(lactide-co-glycolide)-polyethylene glycol-poly(lactide-co-glycolide) decorated with acrylate group in the chain end was prepared. The obtained aqueous solutions of the copolymers could transform into hydrogels with excellent shear thinning properties and rapid elastic recovery properties spontaneously on the increase of temperature. The resulted thermogels also allowed for photo-crosslinking by exposure to ultraviolet radiation, with storage modulus dramatically increased to stable the printed constructs. Through a two-step crosslinking strategy, complicated tissue-like constructs with high shape fidelity can be printed using the dual-sensitive inks. Moreover, the mechanical strength, swelling ratio, and printability of the hydrogels can be tuned by varying the substitution rate of the acrylate group without compromising the inks’ extrudability. We expect that the dual-sensitive hydrogels may be used as bioinks to print large constructs for applications in tissue engineering.
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PubMed
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2022
·
IF 7.139
Rui Jiang,Qian Li,Xue Zheng,Weizhe Wang,Wei Liu,Shuangbao Wang,Zhimou Xu,Jing Peng
Developing hydrogen economy is one of the feasible routes to reduce carbon emission in response to the energy crisis and global warming. The hydrogen generation by electrochemical water splitting has received widespread attention, but it is still challenging to fabricate high-efficient electrocatalysts to decrease the kinetic energy barrier of hydrogen evolution reaction (HER). Loading transition metal (TM) nanoparticles (NPs) into heteroatom-doped carbon materials (HCM) has been reported as a capable scheme to increase the electrochemical activity and stability, but the synergic effect between TM surface and HCM is still worth exploring. Ascertaining that, we used metal-organic frameworks (MOFs) as the sacrificial precursor to synthesis a series of Co NPs encapsulated in N-doped microporous carbon (NMPC) nanocatalysts (denoted as Co@NMPC) with different N species (such as pyrrolic, pyridinic and graphitic N). The nanocatalyst prepared at an appropriate condition displayed an outstanding HER activity with an overpotential of 193 mV in 1 M KOH solution and 132 mV in 0.5 M H 2 SO 4 solution to reach 10 mA cm −2 current density. Furthermore, the results of in situ shielding tests indicate that the synergy of pyridinic N–Co site owing to the intimate contact between Co surface and NMPC play the pivotal role in boosting HER performance. Density functional theory (DFT) calculations were employed to obtain an in-depth mechanism of synergic effect between Co and NMPC.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2021
·Vol. 32
·期 3
·2685-2695
·
IF 2.478
Zhang Hongbo,Fan Lining,Cao Hechun,Yu Yishi,Zhang Tianchi,Feng Qianqian,Zheng Hui,Wu Qiong,Zhang Yang
In this work, M-type hexagonal barium ferrites co-doped with Co and Zr atoms were prepared by a solid-phase method based on the sintering temperature and doping concentration. First, the influences of the sintering temperature on the crystal structure, microstructure, and magnetic properties of ferrites were studied. The crystallinity of the materials increases with the sintering temperature and obtaining high density and uniform grain size at 1300 °C, which promotes grain-boundary diffusion and suppresses grain-boundary migration. Second, the dependence of the crystal structure, microstructure, magnetic, and dielectric properties of Ba(Co x Zr x )Fe 12−2 x O 19 on the doping concentration ( x = 0, 0.2, 0.4, 0.6) was investigated at sintering temperature of 1300 °C. The increase of the crystal parameter c with x value reveals that the ions of Co 2+ and Zr 4+ successfully replace the Fe 3+ ions. Additionally, the co-doping ions of Co 2+ –Zr 4+ promote the grain-boundary migration and result in some large size grain (> 20 mm) that appeared and increased with the doping concentration. The magnetic hysteresis loops reveal the saturation magnetization increases from 60.45 to 68.6 emu/g, and the coercivity decreases from 1800 to 190 Oe with the x increased to 0.6. The dielectric properties measurement displays the Co–Zr co-doping can improve the dielectric and reduce the dielectric loss. The highest value of the real part of permittivity ( ε ′) and the lowest value of the imaginary part of permittivity ( ε ″) can be obtained at a doping concentration of x = 0.4.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2021
·
IF 5.816
Kexin Huang,Wanqing Zhang,Rajkumar Devasenathipathy,Zhongyun Yang,Xiaoxia Zhang,Xiaoqu Wang,Du-Hong Chen,Youjun Fan,Wei Chen
The economical, efficient and durable oxygen reduction catalysts facilitate the enhancement of electrochemical energy devices competitiveness towards widespread applications. In view of this, we provide an innovative sulfuration inducing method for the synthesis of ZnS and cobalt nanoparticles decorated N, S co-doped CNTs (ZnS/Co-NSCNTs) catalyst. S introduced into the zinc-based zeolitic imidazolate frameworks (ZIF-8) and cobalt-based zeolitic imidazolate frameworks (ZIF-67) precursors via pyrolysis , and induced the generation of ZnS/Co-NSCNTs have been confirmed by XRD , SEM, TEM, and XPS techniques . The key features including activity sites, transfer channels and adsorption energy back up the excellent electrocatalytic activity of the as-prepared ZnS/Co-NSCNTs towards oxygen reduction reactions (ORR). ZnS/Co-NSCNTs additionally exhibited a positive half-wave potential of 0.871 V (vs. RHE) with improved current density towards ORR. In alkaline medium , ZnS/Co-NSCNTs catalyst displayed a high tolerance towards methanol and an excellent long-term cycling stability. The observed onset potential for our prepared ZnS/Co-NSCNTs catalyst is analogous with the commercially available noble metal catalysts . Also, ZnS/Co-NSCNTs catalyst as a cathode in zinc-air battery displayed an enhanced electrochemical performance with a highly specific capacity of 750.1 mAh g −1 , outstanding cycling stability, and high rate behavior. This work provides a new approach for the construction of stable low-cost alternative air-cathode catalysts for other energy conversion and storage applications.
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高影响因子
APPLIED ORGANOMETALLIC CHEMISTRY
·
2024
·Vol. 38
·期 8
·e7556
·
IF 3.7
Muhammad Jawad Ahmad,Xue Lu,Liye Liang,Guangming Li
Since catalytic chemoselective reduction of corresponding nitroarenes is a significant route to produce functionalized anilines, developing inexpensive and highly active catalyst is imperia. Herein, the Co-Ce-H 2 salen-hmta composite was first prepared by grinded completely the mixture of Co-H 2 Salen and hexamethylenetetramine (hmta) in 1:1 mol ratio in a mortar. The 3d–4f hetero-metal Co-Ce-H 2 salen coordination polymer acted as a support precursor and hmta provided the nitrogen source. Then, a target catalyst of Co/NC-CeO 2 -hmta were afforded by pyrolysis of Co-Ce-H 2 salen-hmta composite at 800°C in the presence of argon atmosphere. When the target catalyst of Co/NC-CeO 2 -hmta and reference catalysts were applied for the hydrogenation of nitroarenes under N 2 H 4 , the target catalyst of Co/NC-CeO 2 -hmta exhibited better performance than reference catalysts in terms of conversion, yield, selectivity, and recyclability. Spectral analysis suggested that the high catalytic performance of a target catalyst of Co/NC-CeO 2 -hmta were attributed to highly dispersed metallic Co 0 , rich oxygen vacancies, and nitrogen-doped carbon matrix.
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高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2017
·
IF 3.582
Hao Xu,Songsong Li,Lei Ge,Changcun Han,Yangqin Gao,Dongsheng Dai
Efficient separation of photo-generated electrons and holes is a crucial aspect for photocatalytic hydrogen evolution . Herein, novel plate-like Co(OH) 2 decorated TiO 2 nanosheets for photocatalytic water splitting were synthesized by a facile in-situ synthetic method. The results of X-ray diffractometry (XRD), transmission electron microscope (TEM), UV–Vis diffusion reflectance spectroscopy (DRS) and X-ray photoelectron spectroscopy (XPS) indicate the successfully incorporation of Co(OH) 2 co-catalysts onto the surface of TiO 2 nanosheet photocatalysts . Further photocatalytic hydrogen evolution experiments illustrate that all Co(OH) 2 decorated TiO 2 samples show higher rate of hydrogen production performance than pure TiO 2 sample and the composite sample with Co(OH) 2 loading amount of 0.5mol% presents the highest photocatalytic hydrogen production activity of 746.93 μmol g −1 ·h −1 . It is indicated that plate-like Co(OH) 2 particle act as an electron collector, which leads to photo-generated electrons transfer from TiO 2 to Co(OH) 2 , and therefore enhance the photocatalytic activity . Based on above results, a possible mechanism is proposed and further verified by surface photovoltage spectra (SPV).
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高影响因子
Journal of Macromolecular Science Part B-Physics
·
2020
·
IF 0.911
Hailin Xie,Zhihua Zhou,Wenjuan Liu,Yanmin Zhao,Tianlong Huang,Ping Chen,Ziwei Zhou,Dan Wang,Jianglong Duan,Jianjun Fang
Polymeric/ceramic composite scaffolds that are biocompatible and biodegradable are widely used for tissue engineering applications. In this work a series of poly(L-lactide-co-glycolide-co-ε-caprolactone)/nano-biaoactive glass-nano-β-tricalcium phosphate composite scaffolds were successfully fabricated and the influences of the inorganic content and freezing temperature on the physical properties were studied. The composite scaffolds with various inorganic contents showed an interconnected pore structure with irregular shapes. The composite scaffolds had a porosity that was reduced with increasing inorganic content and decreasing freezing temperature. The incorporation of inorganic fillers and decreasing freezing temperature improved the mechanical properties of the hybrid scaffolds. By appropriate control of these two factors (10.0 wt% content of NBAG and β-TCP with freezing at −30 °C) a suitable composite scaffold was prepared as a potential bone tissue engineering implant.
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高影响因子
RARE METALS
·
2022
·Vol. 42
·期 1
·146-154
·
IF 6.318
Wu Yun-Feng,Ma Ji-Wei,Huang Yun-Hui
Designing highly active and durable electrocatalysts towards oxygen reduction reaction (ORR) plays a paramount importance for proton exchange membrane fuel cells. Pt-based binary alloys Pt-M (M = 3d-transition metals) possessing excellent electronic and geometric properties have received increasing interests as highly active electrocatalysts. Herein, we report a series of Pt x Co/C ( x = 1, 2, 3) catalysts by a facile one-pot soft-chemistry method. In the acidic conditions, the mass activities of PtCo/C, Pt 2 Co/C and Pt 3 Co/C are 0.526, 0.462 and 0.441 A·mg Pt −1 , which are 2.60, 2.31 and 2.22 times higher than that of Pt/C (0.200 A·mg Pt −1 ), respectively. The specific activities of PtCo/C, Pt 2 Co/C and Pt 3 Co/C are 706.59, 679.41 and 801.83 μA·cm −2 , which are accordingly 2.89, 2.76 and 3.28 times higher than that of Pt/C (244.75 μA·cm −2 ). Notably, Pt 3 Co/C shows a remarkable durability. After 5000 cycles of the accelerated durability testing, the mass activity and specific activity of Pt 3 Co/C catalyst are 2.47 and 3.80 times higher than that of the commercial Pt/C, respectively. The improved ORR activity and durability can be ascribed to the synergistic interaction between Pt and Co. Graphical
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