DALTON TRANSACTIONS
·
2025
·
IF 3.3
Kang Wang,Chao Fan,Ruihang Hu,Chen Sun,Yan-Qin Wang
During conventional water electrolysis for hydrogen production, the high theoretical potential of the oxygen evolution reaction (OER) leads to excessive energy consumption. In contrast, the urea oxidation reaction (UOR), with its significantly lower theoretical potential, has attracted considerable attention as an energy-efficient alternative for hydrogen production. In this study, we develop a Ni-doped Mn MOF-74 catalyst Ni-Mn MOF-74 supported on carbon cloth (CC), exhibiting a unique bud-like architecture featuring a petal-surrounded pistil morphology, which exhibits excellent UOR performance in alkaline medium. This catalyst achieves a current density of 100 mA cm-2 at an ultralow potential of 1.40 V (vs. RHE) in 1.0 M KOH + 0.5 M urea electrolyte while maintaining remarkable stability. Importantly, in a urea-assisted hydrogen production electrolyzer composed of Ni-Mn MOF-74 (anode) and Pt/C (cathode), the system delivers a current density of 100 mA cm⁻² at a cell voltage of only 1.49 V in alkaline freshwater and 1.50 V in alkaline seawater, respectively, while remaining excellent stability. The enhanced UOR activity stems from Ni doping, which effectively modulates the catalyst's morphology and electronic structure, the synergism of Ni and Mn strengthening the adsorption of urea molecule and OH- ion, thereby accelerating urea decomposition kinetics.
研究领域:
电化学
·
催化
·
材料科学
·
能量转换
·
环境科学
·
纳米技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2019
·
IF 6.393
Ya Xiong,Xiao Chang,Xurong Qiao,Kun Li,Lei Zhu,Fujun Xia,Xiaofang Li,Qingbin Zheng,Wei Xing,Qingzhong Xue
For the first time, Co-MOF-74 derived Co 3 O 4 /graphene heterojunction nanoscrolls (Co 3 O 4 /GNS) structure is synthesized by a simple one-step hydrothermal strategy and subsequent calcination process. Theoretically, the growth mechanism of Co 3 O 4 /GNS is revealed by molecular dynamic simulation, demonstrating that a high loading of Co-MOF-74 nanoparticles is needed for effective rolling of GO. The sensor based on Co 3 O 4 /GNS exhibits high response of 58.1 (34-fold enhancement compared with that of Co 3 O 4 ), short response/recovery time of 12 s/66 s (157 s/200 s for Co 3 O 4 ) toward 1 ppm acetone at 190 °C and superior selectivity, which are much better than those of most reported acetone sensors. Moreover, the Co 3 O 4 /GNS can even detect as low as 50 ppb acetone with a notable response (1.24). The appreciable response together with rapid response/recovery of Co 3 O 4 /GNS is attributed to the large heterojunction interface between Co 3 O 4 and graphene nanoscroll and high-speed gas transfer pathways provided by nanoscroll. This unique structure design is believed to offer guidance for generalizable synthesis of metal oxide/GNS that can be effectively applied in the fields of ppb-level gas detection.
研究领域:
材料科学
·
化学传感器
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
MICROPOROUS AND MESOPOROUS MATERIALS
·
2021
·
IF 5.455
Xiaowu Liang,Pengfei Wang,Congli Li,Min Yuan,Qi Shi,Jinxiang Dong
CO is an important raw material and the separation of CO/N 2 in blast furnace gas can supply an abundant source of CO. Metal organic frameworks (MOFs) containing open metal sites are capable of selectively binding to CO over N 2 . However, the open metal sites easily bind to guest molecules during the preparation and activation process. In this study, typical MOFs containing open metal sites (Co-MOF-74) were used to investigate the activation behavior and corresponding CO/N 2 adsorptive separation performance. To characterize the removal and decomposition of guest molecules, TG-MS and NMR analysis of MOF-74 prepared under different activation conditions were performed. During the heat and vacuum process, the guest H 2 O and methanol (MeOH) molecules in Co-MOF-74 were first removed at 150 °C under vacuum. The aim of high temperature activation at 300 °C is the decomposition of a small amount of bind N,N-dimethylformamide (DMF) and terminal ligands occupying the open metal sites in Co-MOF-74. In addition, H 2 O molecules occupy the open metal sites of Co-MOF-74 during the filtration and MeOH wash steps under air, which is accompanied by the removal of a portion of DMF. The CO adsorption (298 K and 1 bar) and the CO/N 2 selectivity (Ideal adsorbed solution theory: 50:50, v/v) of Co-MOF-74 activated at 300 °C was 6.07 mmol/g and 384, respectively, which was higher than that of the other activated Co-MOF-74 samples and was attributed to the effective removal of guest molecules. Our results may guide the activation of MOFs, which contain open metal sites.
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
MICROPOROUS AND MESOPOROUS MATERIALS
·
2024
·
IF 4.8
Liuqin Zhang,Huali Li,Xiaohu Zhang,Qiuping Li,Gege Zhang,Shuying Pu,Fa-Qian Liu
CuZn-MOF-74 was successfully synthesized at room temperature. And then the efficacy of UV-curable PBMA coating that contains Poly(butyl methacrylate) (PBMA) and CuZn-MOF-74 in terms of stable release of copper ions and anti-fouling properties was evaluated. PBMA/CuZn-MOF-74 coating exhibits stable copper ion release performance due to the coordination between metal ions and organic ligands and the complex interaction between Cu and Zn cations in CuZn-MOF-74. The results of the antibacterial experiment lasting for 21 days show that the addition of MOF-74 improves the antibacterial performance of the coatings and the antibacterial rate can be over 98 %. The antibacterial mechanism of the coating mainly includes the toxic effect of open metal sites, release copper ions and the oxidative stress caused by the increased of ROS. And the coating has good elastic deformation recovery ability, which makes it be able to resist sediment impact in the ocean. Finally, the concise method for preparing MOF-74 (room temperature, only MeOH) and the use of UV-curing to prepare coatings (e.g., solvent-free, mild conditions) are helpful to improve the environmental friendliness. Therefore, this UV-curable PBMA coating containing a low concentration of MOF-74 (e.g., 3 wt%, 6 wt%) would be effective in anti-biofouling while introducing the important advantage of UV-curable method in energy conservation and environmental protection.
研究领域:
材料科学
·
化学
·
环境科学
·
生物技术
✓ 已验证
产品关联
DOI
高影响因子
ACS Sustainable Chemistry & Engineering
·
2020
·
IF 7.632
Qingqing Zha,Mingxia Li,Zihao Liu,Yonghong Ni
Metal–organic frameworks (MOFs) have attracted much interest in electrocatalysis as promising catalysts in recent years. However, it still remains a challenge to directly use MOF-based materials as bifunctional electrocatalysts for overall water splitting. Herein, a hierarchical Co,Fe-MOF-74/Co/carbon cloth (CC) three-layer hybrid electrode is synthesized by a simple electrochemical deposition technology with subsequent solvothermal treatment. Electrochemical performance investigations show that the as-constructed Co,Fe-MOF-74/Co/CC electrode exhibits impressive electrocatalytic activity for full water splitting, which only requires a low overpotential of 226 mV@20 mA cm–2 for the oxygen evolution reaction (OER) and 94 mV@–10 mA cm–2 for the hydrogen evolution reaction (HER), respectively. Employing the as-constructed electrode as the anode and cathode in a two-electrode setup simultaneously, only 1.65 V of the voltage is needed to deliver the current density of 20 mA cm–2. The above excellent electrochemical performances should be attributed to the specific architecture, the synergistic effect of the Co and Fe species, and the superhydrophilic surface of the catalyst. More importantly, further investigations uncover that metal hydroxides and oxyhydroxides produced in situ during electrochemical tests are the veritable active species, which promote the high catalytic activity of the present catalyst.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2023
·Vol. 47
·期 18
·8507-8514
·
IF 3.3
Jianxia Gu,Jingting He,Haiyan Zheng,Chunyi Sun
The novel composite electrocatalysts [Mo3S13]2−/Co-MOF-74 have been successfully prepared by using a simple solvothermal method. The morphology of composite catalysts can be effectively controlled by regulating the amount of [Mo3S13]2− because the addition of [Mo3S13]2 can affect the nucleation rate of Co-MOF-74. After the optimization, [Mo3S13]2−/Co-MOF-74 with spindle-like morphology displays remarkable OER electrocatalytic activity with a low overpotential (368 mV) to afford the current density of 10 mA cm−2 and a small Tafel slope of 90.6 mV dec−1, which is almost on a par with IrO2/C (358 mV, 89.1 mV dec−1). Besides, this composite catalyst can continuously work for about 17 h with almost negligible attenuation in current density. Such an excellent electrocatalytic OER performance of [Mo3S13]2−/Co-MOF-74 benefits from the good morphology obtained by the introduction of a moderate amount of [Mo3S13]2− as well as the synergistic effect between the [Mo3S13]2− and Co-MOF-74. This work provides new insight into the development of MOF-based electrocatalysts for the OER.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
Energy Technology
·
2019
·Vol. 7
·期 6
·1900018
·
IF 3.163
Jianhua Yu,Xiaolei Gao,Zhenxing Cui,Yu Jiao,Qian Zhang,Hongzhou Dong,Liyan Yu,Lifeng Dong
Recently, binary transition metal oxides, phosphates, and sulfides have attracted wide attention due to their potential applications in supercapacitors. The emergence of metal-organic frameworks (MOFs) provides new opportunities for the synthesis and investigation of porous binary metal compounds with similar microstructures. Herein, binary metal oxide (NiCo-O) tubular structures are derived from NiCo-MOF-74 via a facile annealing process, and then phosphate (NiCo-P) and sulfide (NiCo-S) structures are obtained from NiCo-O by heat treatment and solvothermal process, respectively. Among the three derivatives, NiCo-S with nanosheet structures has the highest specific capacitance of 930.4 F g −1 at a current density of 1 A g −1 and an excellent rate capability with a retention of ≈80% at 10 A g −1 . The long-term cycling performance of NiCo-S is superior with 70.5% retention after 10 000 cycles. The hybrid supercapacitor device with NiCo-S and activated carbon as positive and negative electrodes delivers a high energy density of 22.6 W h kg −1 at a power density of 800 W kg −1 . The excellent performance of NiCo-S can be attributed to its nanosheet structure, which increases the specific surface area and electroactive sites.
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
PHYSICA SCRIPTA
·
2022
·Vol. 98
·期 1
·015012
·
IF 3.081
Juncheng Zhou,Xinyue Huang,Wenlin Feng
A Michelson interferometric carbon monoxide (CO) fiber-optic sensor based on Co/Ni-MOF-74 is proposed and fabricated. The bimetallic-ion-coordination MOFs material Co/Ni-MOF-74 was prepared by solvothermal method. Through XRD and XPS characterizations, the results show that Co/Ni-MOF-74 and Ni-MOF-74 have the same crystal structure. Co/Ni-MOF-74 has a good adsorption effect on CO, and it is integrated into the optical fiber sensing structure for CO detection. In the CO concentration range of 0–35 ppm, the sensitivity and linearity are 0.022 35 dB/ppm and 0.999 36, respectively. The detection limit of the sensor is about 1.990 46 ppm. The presented fiber-optic sensor has excellent selectivity, resistance to temperature interference and good time stability, and it is expected to be applied to the detection of trace CO.
研究领域:
材料科学
·
光学工程
·
环境监测
✓ 已验证
DOI
高影响因子
Materials Science and Engineering B-Advanced Functional Solid-State Materials
·
2025
·
IF 4.6
Haoyue Deng,Tiehu Li,Hao Li,Alei Dang,Yongkang Han
In this study, a composite material composed of Mg-MOF-74 and graphene oxide (GO) was synthesized to overcome MOFs’ limitations in CO 2 capture. At 273 K/101 kPa, the Mg-MOF-74 composite containing 6 wt% GO achieved 3.46 mmol/g CO 2 uptake and 114.4 CO 2 /N 2 selectivity, demonstrating 25.8 % and 29.3 % enhancements compared with pristine Mg-MOF-74. This enhancement is due to the optimization of CO 2 adsorption by the new pores formed at the interface and the strong affinity of GO functional groups for CO 2 molecules. Furthermore, due to the excellent properties of GO and its strong interaction with Mg-MOF-74, the composites show notable improvements in thermal, adsorption–desorption cycling, and moisture stability. Notably, the Mg-MOF-74 composite containing 6 wt% urea-modified GO exhibits optimal CO 2 adsorption/stability. This is not only due to the synergy between GO and Mg-MOF-74, but also because the amine groups and polar C O bonds in urea can boost adsorption/separation and enhance stability through amine-Mg 2+ coordination. These findings highlight Mg-MOF-74@GO composites as promising candidates for industrial CO 2 capture.
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Mengdan Ma,Anning Zhou,Tao Hong,Xinyu Jia,Moxuan Liu
Metal-organic frameworks (MOFs) are promising materials for CO 2 adsorption and capture. The unique crystal structure and the open porous structure of MOFs are key factors affecting their CO 2 adsorption performance, but the precise tuning of MOF structures remains a challenge. Herein, we applied the Kamlet-Taft method to investigate the effect of solvent proton-supplying/accepting capaity (β/α parameters) on the structure and CO 2 adsorption performance of Mg-MOF-74 by tuning the reaction solvent polarity. It was found that the ratio of the nucleation rate/growth rate of Mg-MOF-74 could be effectively controlled by adjusting the β/α value of the solvent, realizing the regulation of the crystal structure and morphology of Mg-MOF-74. In addition, the size of solvent molecules played a crucial role in the pore size of Mg-MOF-74. Interestingly, the solvent molecules were competitively coordinated with ligands and participate in the growth of Mg-MOF-74 upon decreasing the β/α value. The crystal structure, morphology and pore size of Mg-MOF-74 could be precisely regulated by the β/α value and molecular size of the reaction solvent, and the highest performing Mg-MOF-74 exhibited a CO 2 adsorption capacity of 7.38 mmol/g.
研究领域:
材料科学
·
环境化学
·
多孔材料
·
气体吸附
·
晶体工程
✓ 已验证
DOI
高影响因子
MOLECULES
·
2023
·Vol. 28
·期 12
·4604
·
IF 4.6
Li Zhang,Mengting Zhang,Pingping Yang,Yin Zhang,Junjie Fei,Yixi Xie
Rutin, as a biological flavonoid glycoside, has very important medicinal value. The accurate and rapid detection of rutin is of great significance. Herein, an ultrasensitive electrochemical rutin sensor based on β-cyclodextrin metal–organic framework/reduced graphene oxide (β-CD-Ni-MOF-74/rGO) was constructed. The obtained β-CD-Ni-MOF-74 was characterized by X-ray diffraction spectroscopy (XRD), X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FT-IR), and nitrogen adsorption and desorption. The β-CD-Ni-MOF-74/rGO presented good electrochemical properties benefiting from the large specific surface area and good adsorption enrichment effect of β-CD-Ni-MOF-74 and the good conductivity of rGO. Under optimal conditions for the detection of rutin, the β-CD-Ni-MOF-74/rGO/GCE showed a wider linear range (0.06–1.0 μM) and lower detection limit (LOD, 0.68 nM, (S/N = 3)). Furthermore, the sensor shows good accuracy and stability for the detection of rutin in actual samples.Keywords:electroanalysis;carbon materials;electrochemical reduction;modified electrode
研究领域:
分析化学
·
材料科学
·
电化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2022
·
IF 5.518
Yujuan Cao,Ning Wu,Fan Yang,Meng Yang,Tingting Zhang,Hao Guo,Wu Yang
Due to the insufficient performance, it is still a challenge to combine conventionally synthesized metal-organic framework (MOF-74) with other materials to fabricate composite electrodes for high-performance supercapacitors . Herein, we synthesized a series of NiCo-MOF-74 composite materials with different amounts of polypyrrole nanotubes (T-PPy) denoted as NiCo-MOF-74/T-PPy-m (m = 2.5, 5, 10, 15 and 20) through in situ growth of the bimetallic MOF around the PPy nanotubes by a simple solvothermal method . By comparison, the NiCo-MOF-74(1)/T-PPy-10 composite, with a Ni/Co molar ratio of 1:1 obtained in the presence of 10 mg of T-PPy, possessed the highest specific capacitance of 849 C·g −1 at 1 A·g −1 and excellent cyclic stability with a capacitance retention rate of 90.0% after 10,000 cycles as well as good rate performance. Moreover, the assembled asymmetric supercapacitor respectively using NiCo-MOF-74(1)/T-PPy-10 and active carbon as positive electrode and negative electrode achieved a superior energy density of 58.4 Wh kg −1 at the power density of 747.6 W kg −1 and high cyclic lifespan (91.4% capacitance retention after 10,000 cycles). The mechanism of capacitance increase was studied in detail, influences of metal molar ratios, morphology and addition amounts of PPy on electrochemical performances of the formed composition materials were systematically discussed, and it was found that the interpenetrating network structure assembled by “string of candied haws”-like T-PPy-interweaved NiCo-MOF-74(1) polyhedrons possessed the best capacitive performance for enhanced conductivity of the resulted composite, improved dispersity of the bimetallic MOF and more exposed active sites. And the interwoven structure alleviated the stress change-induced structure or phase variation caused by repeated volumetric swelling and shrinking during charge/discharge cycle and enhanced the rate capability and cycling stability.
研究领域:
材料科学
·
电化学
✓ 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）