DALTON TRANSACTIONS
·
2022
·Vol. 51
·期 19
·7561-7570
·
IF 4.569
Wenhao Liao,Xianfeng Tong,Yali Zhai,Haojiang Dai,Yingyan Fu,Min Qian,Geng Wu,Tianyun Chen,Qinghua Yang
In order to lower energy consumption it is critical to develop highly efficient and stable non-precious metal bifunctional catalysts. In this study, we found that rational design of novel nanostructures is able to increase the number of active sites, conductivity and accelerate electron transfer, thus promoting enhanced performance of the catalyst. We successfully synthesized carbon nanotubes (CNTs) containing a hollow polyhedral (CNTHPs) structure through annealing, etching and phosphating. The unique hollow shape not only provides a stable structure but also facilitates mass and charge transfer. Thus, CoP/CNTHPs can catalyze the hydrogen and oxygen evolution reactions effectively with overpotentials of 147 and 238 mV at 10 mA cm−2. Simultaneously, CoP/CNTHPs only needs a voltage of 1.54 V to attain a current density of 10 mA cm−2 in the electrocatalytic water splitting process, demonstrating its bifunctional activity. Furthermore, the electrolytic catalytic performance does not weaken significantly after 12 hours of electrolysis, demonstrating excellent stability. Overall, this research offers useful insights into rational design of high-performance non-noble metal catalysts.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Liang Ma,Meng Zhang,Zengyan Wei,Xiangyu Meng,Rongfeng Chen,Meixi Qin,Lin Zhu,Yaming Wang,Xiaoxiao Huang,Ming Feng,Peigang He,Dechang Jia,Yu Zhou,Xiaoming Duan
Efficient oxygen evolution reaction (OER) electrocatalysts with non-noble metals are very important for the large-scale application of electrocatalytic hydrogen production systems. ZIF-67 as a promising precursor to prepare Co-based catalysts suffer from its poor conductivities and low intrinsic catalytic activities. In this study, we developed a Co 3 O 4 /CeO 2 /C heterostructure nanoflowers (CoCe/C HFs) catalyst with two-dimension (2D) nanostructures using a facile one step hydrothermal reaction. This method is both energy-efficient and environmentally friendly. Hierarchical three-dimensional (3D) nanoflower structure increased active metal sites enhanced the electronic conductivity. The synthesized Co 10 Ce 1 /C HFs (the molar ratio of Co:Ce = 10:1) display excellent OER activities with a low overpotential of 274 mV and small Tafel slope (82.6 mV dec −1 ) in 1 M KOH. This performance surpasses that of both monometallic Co 3 O 4 /C and the commercial RuO 2 catalysts. Electrochemical tests, X-ray photoelectron spectroscopy, and density functional theory (DFT) calculations results indicate that the superior OER performance of Co 10 Ce 1 /C HFs is attributed to optimized electronic structure of Co 3 O 4 , and the improved conductivities and the cooperative effects between Co 3 O 4 and CeO 2 interfaces.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
MOLECULES
·
2024
·Vol. 29
·期 9
·2078
·
IF 4.2
Yu Cao,Zeming Dai,Xuan Zhou,Yuting Lin,Jianhua Hou
The dyes in printing and dyeing wastewater are harmful to the human body and the environment. It is essential to develop practical and effective adsorbents to deal with them. In this study, an Fe-doped, ZIF-67 derived Fe/Co/C composite material with strong magnetism was successfully synthesized. The effects of pH, initial concentration, and adsorption time on the properties of the adsorbent were investigated. To further improve the removal efficiency and enhance the practicality, potassium peroxymonosulfate (PMS) was added to the system due to its Fenton-like effect. Then, an Fe/Co/C composite was used with PMS to remove Congo red (CR) with a 98% removal of 250 mg·L−1. Moreover, for its high saturation magnetization of 85.4 emu·g−1, the Fe/Co/C composite can be easily recovered by applying a magnetic field, solving the problem that powdery functional materials are difficult to recover and, thus, avoiding secondary pollution. Furthermore, since the composite material was doped before carbonization, this synthetic strategy is flexible and the required metal elements can be added at will to achieve different purposes. This study demonstrates that this Fe-doped, ZIF-67 derived magnetic material has potential application prospects for dye adsorption.
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
Catalysis Science & Technology
·
2022
·Vol. 12
·期 8
·2519-2530
·
IF 6.177
Lixue Qi,Jiajun Dai,Yichen Liao,Jian Tian,Daohua Sun
The low olefin selectivity of Pd-based catalysts is a long-term challenge for the selective hydrogenation of 1,3-butadiene. Hybrid Pd/metal–organic framework (MOF) catalysts may help tackle this problem as they can stabilize Pd nanoparticles and regulate their electronic property. Herein, both surface-supported Pd/ZIF-67 and encapsulated Pd@ZIF-67 catalysts were prepared to explore the synergy between Pd and ZIF-67 and the structure–performance relationship of the catalysts. SEM and TEM reveal the different spatial positions of Pd on the two catalysts. Interestingly, encapsulated Pd@ZIF-67 shows excellent catalytic performance in the 40 h test, with a conversion of 100% and a butene selectivity of 98%, outperforming the surface-supported Pd/ZIF-67 catalyst. XPS, CO-IR and DFT calculations indicate that the encapsulated structure promotes the synergistic interaction between the ZIF-67 and Pd sites. Furthermore, in situ DRIFTS of 1-butene reveals that the enhanced synergistic interaction weakens the adsorption of 1-butene on the catalyst surface while inhibiting its isomerization and further hydrogenation. The presented strategy together with the mechanistic results clarify the relationship between the structure and the synergistic interaction and provide a promising approach for the application of synergistic interactions in hydrogenation catalysts.
研究领域:
催化化学
·
材料科学
✓ 已验证
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2020
·
IF 4.939
Yongqing Wang,Zhiqiang Lan,Hong Fu,Haizhen Liu,Jin Guo
MgTM/ZIF-67 nanocomposites were prepared by the deposition-reduction method using ZIF-67, MgCl 2 , and TMCl x (TM = Ni, Cu, Pd, Nb) as raw materials. The dehydrogenation activation energies of MgTM/ZIF-67 (TM = Ni, Cu, Pd, Nb) nanocomposites were calculated to be 115.4 kJ mol −1 H 2 , 115.7 kJ mol −1 H 2 , 113.6 kJ mol −1 H 2 , and 75.8 kJ mol −1 H 2 , respectively; hence, the MgNb/ZIF-67 nanocomposite manifested the best comprehensive hydrogen storage performance. The hydrogen storage capacity of the MgNb/ZIF-67 nanocomposite was hardly attenuated after the 100th hydrogen absorption-desorption cycle. The dehydrogenated enthalpies of MgH 2 and CoMg 2 H 5 in MgNb/ZIF-67 hydride were calculated to be 72.4 kJ mol −1 H 2 and 81.0 kJ mol −1 H 2 , respectively, which were lower than those of additive-free MgH 2 and Mg/ZIF-67. The improved hydrogen storage properties of MgNb/ZIF-67 can be ascribed to the CoMg 2 –Mg(Nb) core-shell structure and the catalytic effects of NbH and niobium oxide nanocrystals .
研究领域:
材料科学
·
催化化学
✓ 已验证
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2025
·
IF 7.7
Zhonghang Xia,Han Zheng,Huiming Ji,Yiwen Zhang
H 2 gas sensors with facile preparation, high sensitivity and low detection limits are crucial for hydrogen energy safety. Given the high surface area, abundant porosity and high stability, zeolitic imidazolate frameworks (ZIFs) provide a potential development path for hydrogen sensors. In this work, ZIF-67@ZIF-8 modified with palladium nanoparticles (Pd NPs) was synthesized by room-temperature solution synthesis and NaBH 4 reduction method. The xPd@ZIF-67@ZIF-8 (x=10, 20, 30, 40) samples exhibit a rough mesoporous surface due to etching of NaBH 4 and feature a uniform distribution of Pd NPs. The modification of Pd NPs broadens the hole accumulation layer (HAL) of ZIF-67@ZIF-8 and decreases the resistance (from ~500 to 1 MΩ), thereby reducing the operating temperature. It is noteworthy that the operating temperature zone of 20 Pd@ZIF-67@ZIF-8 is 85-115 ℃ with higher hydrogen sensitivity than the other sensors at optimum operating temperature (≥ 100 ℃). Meanwhile, the 20 Pd@ZIF-67@ZIF-8 sensor demonstrates a rapid response speed to low concentration H 2 (response to 50 ppm H 2 within 8 s) on account of the spillover and catalytic effects of Pd NPs. Furthermore, the 20 Pd@ZIF-67@ZIF-8 sensor possesses a relatively low theoretical detection limit (16.5 ppb), and exhibits excellent moisture resistance, cycle and long-term stability. This sensitive material provides a prospective avenue for hydrogen energy safety monitoring.
研究领域:
材料科学
·
传感器技术
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
ChemistrySelect
·
2024
·Vol. 9
·期 4
·e202304908
·
IF 1.9
Jiajia Yang,Yawei Chen,Yiting Cao,Weiming Liu,Tongtong Zhang,Huiyun Zhou
Graphical In this paper, the nanocomposites with dodecahedral structure ZIF-8@ZIF-67 and BBH@ZIF-8@ZIF-67 have been synthesized by one-pot method. Bimetallic MOFs ZIF-8@ZIF-67 exhibited superior antibacterial properties and good biocompatibility. BBH-loaded ZIF-8@ZIF-67 showed enhanced synergistic antibacterial activity. Molecular docking suggests that PBP2a and DHFR may be potential antibacterial targets of BBH. Stimulus-responsive nanocarrier materials have garnered significant attention in biomedical science. Among them, metal-organic frameworks (MOFs) have emerged as promising candidates due to their remarkable antibacterial properties and pH sensitivity. In this study, a pH-responsive bimetallic MOFs carrier, ZIF-8@ZIF-67, was successfully synthesized for the delivery of berberine hydrochloride (BBH). Comprehensive characterization using UV-Vis spectroscopy, FT-IR spectroscopy, X-ray diffraction (XRD), scanning electron microscopy (SEM), and transmission electron microscopy (TEM) confirmed the successful synthesis and structural integrity of ZIF-8@ZIF-67 and BBH@ZIF-8@ZIF-67. Subsequently, the drug release behavior, antibacterial efficacy, and biocompatibility of the composite material were systematically evaluated. Our findings revealed that BBH@ZIF-8@ZIF-67 exhibited well-controlled drug release properties, excellent antibacterial effects and biocompatibility. Furthermore, molecular docking results revealed that penicillin-binding protein 2a and dihydrofolate reductase in S. aureus may serve as two potential antibacterial targets for BBH. This research provides valuable insights into the use of bimetallic MOFs materials for developing highly efficient stimulus-responsive nanocarrier systems in biomedical applications.
研究领域:
纳米技术
·
生物医学科学
·
材料科学
·
药学
·
微生物学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2018
·
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
Advanced Materials Technologies
·
2017
·Vol. 2
·期 12
·1700224
·
IF 0
Zehui Li,Wenbo Wang,Hongbin Cao,Qiang Zhang,Xinyuan Zhou,Dongbin Wang,Yaling Wang,Shuangshuang Zhang,Guangjin Zhang,Chenming Liu,Yi Zhang,Rongji Liu,Jingkun Jiang
A new hydrogen peroxide detection sensitive material, boron doped carbonized ZIF-67@graphene (Co-N/C@G-B) is synthesized through pyrolysis of a sandwich-like ZIF-67 coating graphene material. After doping boron atoms by using chemical vapor deposition method, new active sites such as Co 2 B and B N C bonds are created, and mesopores are significantly increased. Most importantly, this Co-N/C@G-B material is found to exhibit excellent performance as an enzyme-free biosensor for detecting hydrogen peroxide with a very wide detection range (from 0.5 × 10 −6 to 60 × 10 −3 m ), a low detection limit (0.19 × 10 −6 m ), and a rapid response time (≈3 s). The prepared biosensor also shows strong anti-interference ability in the complex working occasions. Furthermore, for real application of the materials, an electronic device of biosensor is developed by using technologies of screen printing electrode, integrated circuit, 3D printed shell, and custom-developed program, which shows high sensitivity and portability to detect hydrogen peroxide. Such device paves a way for further practical application of advanced materials in commercial scale.
研究领域:
材料科学
·
生物医学工程
·
分析化学
✓ 已验证
DOI
JOURNAL OF ALLOYS AND COMPOUNDS
·
2024
·
IF 5.8
Shang Gao,Xinmeng Li,Chenyu Wang,Ruihua Yuan,Qin Zhang
Although metal-organic framework (MOF) derivatives are expected to exhibit advanced gas sensing properties, few amorphous MOF derivatives have been synthesized and used as gas sensors because common synthetic methods usually yield crystalline derivatives. In this work, an amorphous derivative of ZIF-67 consisting of nanocubes with an average size of about 200 nm was synthesized by calcining ZIF-67 at 260 ℃. The amorphous derivative started to transform into crystalline Co 3 O 4 at a calcination temperature of 270 ℃, during which the nanocubes collapse into nanoparticles . The amorphous derivative has a high specific surface area of 350.2 m 2 /g and a high mesopore ratio of 77.3 %. Remarkably, the amorphous derivative of ZIF-67 delivers a significantly enhanced response of 74.8–100 ppm triethylamine (TEA) gas at a low working temperature of 100℃ (30 % relative humidity), which is superior to that of ZIF-67 and its crystalline derivative. In addition, the amorphous derivative offers higher selectivity, greater long-term stability and good response under high relative humidity conditions. The response and recovery times are 125 s and 88 s. The improved gas sensing performance is mainly attributed to the high adsorbed oxygen content, large specific surface area and higher porosity of the material. The synthetic method detailed here could facilitate the development of gas sensors based on amorphous materials.
研究领域:
材料科学
·
化学工程
·
传感器技术
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2020
·
IF 3.807
Xia Wang,Fei Yang,Min Jiang,Lingyi Shen,Ji Ma,Jianming Zhang
Effective utilization of waste biomass has been a fascinating topic for the development of sustainable energy. An effective alkaline hydrothermal/pyrolysis process was designed to prepare highly porous carbons noted as HK-PSC800 using waste Platanus acerifolia seeds as precursors. A symmetric supercapacitor (SSC) device based the same two HK-PSC800 electrodes owns the high specific energy density (30.9 Wh kg −1 at a low power density of 500 W kg −1 ) with excellent rate capability. To further optimize the energy density of the device, two types of asymmetric supercapacitors (ASC) with a working potential window of 1.5 V are designed and assembled by using HK-PSC800 and Co 3 O 4 derived from zeolitic imidazolate framework-67 as electrode materials . The specific energy density of as-fabricated ASC (Co 3 O 4 //HK-PSC800) with pure Co 3 O 4 materials as the positive electrode is nearly the same as the SSC (HK-PSC800//HK-PSC800). However, the specific energy density of the other ASC (Co 3 O 4 @HK-PSC800//HK-PSC800) can be improved by 18.8% when 28 wt% Co 3 O 4 is in-situ grown in HK-PSC800 as the positive electrode. This research proves that the suitable composition of ASC electrode materials helps us to develop biomass based carbons materials for application in the high-voltage and high-energy devices.
研究领域:
材料科学
·
能源技术
·
可持续发展
✓ 已验证
DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2020
·
IF 16.683
Wenkai Pei,Junyang Zhang,Haijian Tong,Mengna Ding,Fengyan Shi,Ruizhe Wang,Yuning Huo,Hexing Li
The serious problem from pollution of metal ions placed great pressure to global water ecosystem and human beings. Herein, a synergistic photocatalytic-photothermal system of integrated membrane for the removal and reutilization of aqueous Ag + ions was designed. The crystal of zeolitic imidazolate frameworks-67 (ZIF-67) stably grew on the graphene oxide (GO) membrane with the uniform distribution. In the ZIF-67/GO membrane, the adsorption and photo-reduction of Ag + ions on ZIF-67 crystals led to the deposition of Ag nanoparticles on the membrane surface, which facilitated the capture of visible light, suppressed the recombination of the electron-hole pairs and promoted the photothermal effect. Meanwhile, the high efficiency of photothermal conversion on GO substrate realized the water evaporation to concentrate the Ag + solution and inhibited the separation of photo-induced charges. The synergistic photocatalytic-photothermal route on ZIF-67/GO membrane provides a new sight for the recycle of metal ions for the future practical applications.
研究领域:
环境科学
·
材料科学
✓ 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）