Sustainable Energy & Fuels
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2019
·Vol. 4
·期 1
·164-170
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IF 4.912
Shijian Luo,Xiaoman Li,Wanguo Gao,Haiqiang Zhang,Min Luo
Today, industrial ammonia synthesis mainly depends on the Haber–Bosch process, which causes a lot of energy consumption and huge CO2 emissions. The electrochemical N2 reduction reaction (NRR) is considered a more sustainable and environmentally benign alternative to produce ammonia, but it requires an efficient catalyst to overcome the difficulty of N2 activation. In this work, we reported that MOF-derived C@NiO@Ni microtubes behaved as a high-efficiency electrocatalyst in 0.1 M KOH electrolyte. This electrocatalyst achieved a high NH3 yield of 43.15 μg h−1 mgcat.−1 and faradaic efficiency of 10.9% at −0.7 V vs. a reversible hydrogen electrode. The experimental results indicated that the excellent NRR performance originated from the oxygen vacancies in NiO. Moreover, the abundant NiO/Ni interfaces were conducive to proton adsorption and further enhanced the NRR performance.
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ANALYTICAL SCIENCES
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2019
·Vol. 35
·期 6
·639-644
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IF 1.618
Shan Xueling,Pan Yuting,Chen Xiaohui,Wang Wenchang,Chen Zhidong
A novel electrochemiluminescence (ECL) sensor for detection of brilliant blue FCF (BB) has been developed using Ru@ Zn-MOF/nafion modified GCE (glass carbon electrode) in this research. Different from conventional method for usage of Ru(bpy) 3 2+ in solution-phase, Ru(bpy) 3 2+ here was immobilized on a zinc-metal-organic-framework (Zn-MOF). After adding BB, a significant quenching phenomenon of ECL intensity was observed. The behavior of BB on the quenching effect of Ru(bpy) 3 2+ /Zn-MOF in different conditions was investigated thoroughly and the detection limit was achieved to 2.5 × 10 −8 M in an optimized condition. Furthermore, the interference of some conventional ions and amino acids to the detection of BB was also investigated. Additionally, the composite showed a good effect on the detection of BB in commercial samples. The proposed sensor provided a promising platform for food safety analysis, environmental monitoring and clinical testing.
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SENSORS AND ACTUATORS B-CHEMICAL
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2019
·
IF 6.393
Dejian Li,Sisi Zhang,Xuan Feng,Hongjing Yang,Fei Nie,Wenyan Zhang
In this work, a metal organic framework material ([Co(L)(H 2 O) 2 ] n , Co-MOF) was synthesized by a facile hydrothermal method, and it was found that Co-MOF have a peroxidase-like activity. They can efficiently catalyze the chemiluminescence (CL) reaction between luminol and H 2 O 2 and enhance the CL signal significantly. The possible enhancement mechanism suggested that Co-MOF catalyzed the decomposition of H 2 O 2 into O 2 and increased the generation of •O 2 − . Based on these findings, a new highly sensitive glucose sensor was constructed combined with the luminol-H 2 O 2 -Co-MOF CL system and glucose oxidase. Under the optimal conditions, the method exhibited a good linear response to glucose in the range of 0.04˜8 μM with a detection limit of 1 × 10 -8 M. The method has been further applied in the quantitative determination of glucose in human serum and urine successfully.
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APPLIED CATALYSIS B-ENVIRONMENTAL
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2019
·
IF 14.229
Yunhong Pi,Shuo Jin,Xiyi Li,Shi Tu,Zhong Li,Jing Xiao
Constructing advanced heterojunction structures is an effective approach to improve light utility and enhance photogenerated charge separation and transfer for solar energy conversion. Herein, we reported a MWCNT@MOF-derived In 2 S 3 hollow tube heterostructure via facile MOF sulfidation process, significantly boosting its photocatalytic degradation performance of tetracycline (TC) under visible light irradiation. The MWCNT bonds to the In 2 S 3 hollow tube strongly to construct an effective heterojunction, as illustrated in TEM and Raman spectroscopy. The 0.3%-MWCNT@MOF-derived In 2 S 3 exhibited the highest photocatalytic activity for visible-light-driven TC degradation, achieving ˜100% degradation efficiency, with its apparent reaction rate constants 3–5 times higher than that of the pure MOF-derived hollow In 2 S 3 and traditional In 2 S 3 bulk. The boosted visible-light-driven degradation efficiency was attributed to the synergy between electron acceptor of MWCNTs for enhanced separation of charge carriers and active center of MOF-derived In 2 S 3 hollow tube with shorter transfer distance of charge carriers, which not only promotes the carrier transfer and inhibits the recombination rate effectively, but also improves the visible light response. Such MOF-derived visible-light-active heterostructures thus provide a novel insight into the development of highly efficient photocatalyst for a wide usage.
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CERAMICS INTERNATIONAL
·
2018
·
IF 3.057
Shumin Wu,Xianliang Li,Yan Xu,Junbiao Wu,Zhuopeng Wang,Yide Han,Xia Zhang
Hierarchically spinel Ni x Co 1- x Fe 2 O 4 (0.0 ≤ x ≤ 0.5) microcubes were successfully prepared through a combined solvent evaporation strategy and morphology-inherited annealing treatment. By using the Fe-based metal-organic frameworks (MOFs), Fe 4 (Fe(CN) 6 ) 3 , and inorganic Ni 2+ and Co 2+ acetate salts as co-templated precursors, hierarchical Ni-doped spinel CoFe 2 O 4 architecture can be obtained, and the Ni/Co substitution ratios can be controlled systematically. The obtained cubic hierarchical Ni x Co 1- x Fe 2 O 4 , (0.0 ≤ x ≤ 0.5) composites presented highly acetone sensing properties, among which the Ni 0.1 Co 0.9 Fe 2 O 4 composite showed the strongest response performance (with gas response ( R g / R a ) of 1.67 at 240 °C) and excellent reproducibility (for at least 14 cycles), and the proposed acetone sensing mechanism was also discussed. The presented solvent evaporation and co-templated strategy may allow precisely access to fabricating other heteroatom doped inorganic materials with intriguing morphologies, architectures, chemical compositions and tunable sensing properties.
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ACS Applied Materials & Interfaces
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2018
·
IF 8.097
Yaxing Zhang,Jiaoyan Xu,Jianfei Xia,Feifei Zhang,Zonghua Wang
Herein, we report a high-performance electrocatalyst by orientationally growing Ni2P nanoparticles in situ on graphene film (Ni2P/G) for nonenzymatic glucose sensors in alkaline media. The combination of highly active Ni2P and stable graphene film with rapid conductivity enables this composite to display excellent electrochemical activity toward glucose with enhanced electron transfer rate and steadiness. With Ni-MOF-74 as a precursor, Ni2P/G showed even metal distribution, massive exposure of active sites, and spatially ordered structure. Benefiting from the synergistic reaction of Ni2P particles and graphene, this metal–organic frameworks (MOF)-derived composite exhibited high electrocatalytic activity and specificity toward glucose electrooxidation. Under optimized conditions, a wide linear response was obtained from 5 μM to 1.4 mM with a detection limit of 0.44 μM. Furthermore, an excellent linear response (R2 = 0.9897) was also obtained by a Ni2P/G modified electrode in human serum with the concentration of glucose ranging from 1 to 8 mM, indicating that the Ni2P/G platform could be utilized for glucose monitoring in practical life.
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Journal of Materials Chemistry A
·
2018
·Vol. 6
·期 30
·14930-14938
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IF 9.931
Y. F. Cui,W. Jiang,S. Liang,L. F. Zhu,Y. W. Yao
A series of In/Ga-based MIL-68s, with batch molar ratios of In(III) to Ga(III) (In/Ga ratio) equaling 5 : 0, 4 : 1, 3 : 2, 1 : 1, 2 : 3, 1 : 4, and 0 : 5, were solvothermally prepared. Calcinating the as-prepared MOFs at 500 °C for 3 h produced a series of mesoporous In/Ga oxides (IGOs) of hexagonal morphology with a characteristic main pore radius of 3 nm to 12 nm, and a specific surface area of up to 60–135 m2 g−1. Studies on the ethanol gas-sensing properties of the as-prepared IGOs revealed that the two IGOs produced from MIL-68 with In/Ga ratios of 3 : 2 and 1 : 1 present high response values of 80–110 towards 300 ppm ethanol and a low detection limit of no more than 2 ppm. However, the response value of In2O3, produced from MIL-68 with an In/Ga ratio of 5 : 0, was 11 towards 300 ppm ethanol. At the same time, the two IGO samples exhibited a high response to ethanol, which was more than 2.6 times higher than response values towards CH3CHO, CH3COCH3, H2, CO, CH4, and NO2, at a concentration of 300 ppm. This gas-sensing performance is suggested to be attributed to their comparatively larger specific surface area, and remarkable oxygen vacancy capabilities.
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JOURNAL OF MEMBRANE SCIENCE
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2019
·
IF 7.015
Yuan Yuan Cai,Qian Yang,Zhao Yu Zhu,Qi Hui Sun,Ai Mei Zhu,Qiu Gen Zhang,Qing Lin Liu
Metal-organic frameworks (MOFs) have attracted immense attention in the field of proton-conducting materials due to their high tunability and designability. Although considerable advances have been achieved in the design and fabrication of MOF-based proton-conducting materials, the design of MOF-based proton exchange membranes (PEMs) with excellent conductivity and low methanol permeability for fuel cells remains a great challenge. MOF-polymer hybrids exhibit excellent performances hard to realize from the individual components so that they are known as potential candidates for PEMs. Encapsulation of polymer into nanoporous MOFs is an effective strategy for constructing long-range ordered and continuous nanochannels to achieve efficient ion transport. Herein, a simple and rapid encapsulation strategy is used to encapsulate poly(4-styrenesulfonate) (PSS) into the nanochannels of ZIF-8 to prepare the MOF-polymer hybrid membranes (PSS@ZIF-8). The PSS is threaded in ZIF-8 through a solid confinement conversion process, whereby fast proton transport occurs in the ionic nanochannels created in ZIF-8. Strikingly, the resulting membrane possesses superior proton conductivity (2.59 × 10 -1 S cm -1 at 80 °C and 100% RH) and good methanol-barrier property (2.08 × 10 -9 cm 2 s -1 ), surpassing state-of-the-art Nafion membranes and most of the reported MOF-based proton-conducting materials.
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Small
·
2019
·Vol. 15
·期 35
·1902218
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IF 10.856
Xiaofang Li,Dong-Dong Ma,Changsheng Cao,Ruqiang Zou,Qiang Xu,Xin-Tao Wu,Qi-Long Zhu
Controllable synthesis of ultrathin metal–organic framework (MOF) nanosheets and rational design of their nano/microstructures in favor of electrochemical catalysis is critical for their renewable energy applications. Herein, an in situ growth method is proposed to prepare the ultrathin NiFe MOF nanosheets with a thickness of 1.5 nm, which are vertically inlaid into a 3D ordered macroporous structure of NiFe hydroxide. The well-designed composite delivers an efficient electrocatalytic performance with a low overpotential of 270 mV at a current density of 10 mA cm −2 and stable electrolysis as long as 10 h toward the electrochemical oxygen evolution reaction, much superior to the state-of-the-art RuO 2 electrocatalyst. A comprehensive analysis demonstrates that the excellent performance originates from the desirable combination of the highly exposed active centers in the ultrathin bimetallic MOF nanosheets, effective electron conduction between MOF nanosheets and ordered macroporous hydroxide, and efficient mass transfer across the hierarchically porous hybridization. This study sheds light on the exploration of powerful protocols to gain diverse high-performance MOF nanosheets and may open a perspective to achieve their efficient electrocatalytic performance.
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JOURNAL OF SOLID STATE CHEMISTRY
·
2024
·
IF 3.2
Wei Xia,Gui-Zhi Guo,Xue-Qian Wu,Ya-Meng Yin,Ya-Pan Wu,Shuang Li,Ruan Chi,Dong-Sheng Li
Direct methanol fuel cells (DMFCs) can permit the utilization of noble-metal-free electrocatalysts , which certainly reduces the cost and accelerates their practical implementation. With the exploration of efficient and economical methanol oxidation reaction (MOR) catalysts, Ni-based nanostructures have been recognized as the most promising MOR catalysts in alkaline media. Herein, we construct a novel heterojunction MOR electrocatalyst composed of Ni-based metal-organic framework (Ni-MOF) and NiFe-based layered double hydroxides (LDHs) through a coordination-induced self-assembly strategy. Owing to the synergic effect between Ni and Fe sites, coupled with the effect of hetero-interface, the resultant Ni-MOF/NiFe-LDH composite exhibits remarkable MOR activity in 0.1 M KOH electrolyte with the oxidation current density (32.66 mA cm −2 ) is 2.65 and 2.44 times higher than that of the primitive NiFe-LDH and Ni-MOF. The excellent stability of the Ni-MOF/NiFe-LDH electrocatalyst has also been confirmed by long-term chronoamperometry (CA) analysis. Our work paves a facile controllable way for fabricating MOF/LDH heterostructure targets on MOR and underlines its potential to boost energy conversion efficiency through the manipulation of synergic components.
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Materials Chemistry Frontiers
·
2024
·
IF 6
Xin Fu,Bo Pu,Li Pan,Ruiqi Ming,Qian Lv,Xiaobo Chen,Lihong Tian
Urea oxidation reaction (UOR) is a promising substitution for the oxygen evolution reaction (OER) on anode for highly efficient H2 production. However, the sluggish kinetics and high oxidation potential of NiII → NiIII severely limit the activity of Ni-based catalysts in the electrochemical UOR. Herein, composition regulation was adopted to enhance the electrocatalytic activity of a nickel-benzene dicarboxylate framework (Ni-BDC MOF)-derived electrode towards urea oxidation. In 1 M KOH with 0.33 M urea solution, the derived amorphous tri-metallic hydroxide layer on the surface of the NiMnCo MOF, induced by electro-activation, exhibited a low onset potential and a steeply rising current density with increasing applied potential. It achieved a benchmark current density of 10/100 mA cm−2 at an anode potential of 1.28/1.33 V vs. RHE, respectively. In particular, a 500 mA cm−2 current density was reached at an impressively low potential of 1.41 V vs. RHE. This exceptional performance is ascribed to the fact that the open framework provides a large electrochemical active surface, while the multicomponent synergy decreases the NiII → NiIII oxidation potential, enhances electron transfer and promotes the UOR kinetics. This study suggests that rational composition regulation is a promising approach to improving the performance of Ni-based MOF materials towards electrocatalytic urea oxidation.
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ACS Applied Materials & Interfaces
·
2025
·
IF 8.2
Vinayak Hegde,Mahesh P. Bhat,Jae-Ho Lee,Cheol Soo Kim,Kyeong-Hwan Lee
Pesticide delivery carriers provide protection against pathogens but face significant challenges, including limited loading capacity, rapid release rates, and inconsistent performance. To address these issues, this study develops a dual-stimuli-responsive pesticide delivery carrier, featuring an iron–copper bimetal–organic framework (Fe–Cu MOF) supported on diatomaceous earth (DE) and coated with lauric acid (LA). Here, DE serves as a biocompatible scaffold, enhancing the adhesion and retention of MOF particles at target sites, thereby improving the pesticide localization and delivery efficiency. The carrier exhibits a high thiabendazole (Tbz) loading capacity of 38.14% owing to its nanoporous structure. The LA coating functions as a pH- and temperature-responsive barrier, regulating pesticide release to prolong the treatment duration and minimizing the need for repeated applications. The carrier demonstrates controlled release rates of 80.73% at pH 5 and 96.55% at 40 °C, confirming its dual-stimuli responsiveness. In vitro assays reveal 92.26% inhibition of Botrytis cinerea at 1 μg mL–1, while in vivo experiments on tomato plants and fruits show complete inhibition at 200 μg mL–1. Additionally, the developed composites adhere strongly to leaves through electrostatic and hydrogen-bonding interactions, reducing the loss of pesticide due to rain erosion. Overall, DE-MOF-Tbz-LA presents a promising and efficient alternative to conventional pesticide applications.
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