scholarly journals Conductive Metal-Organic Frameworks for Amperometric Sensing of Paracetamol

2020 ◽  
Vol 8 ◽  
Author(s):  
Jing Wang ◽  
Sen Liu ◽  
Jiahuan Luo ◽  
Shaogang Hou ◽  
Haixiang Song ◽  
...  
Keyword(s):  
Electrical Conductivity ◽  
Catalytic Activity ◽  
Detection Limit ◽  
Metal Organic Frameworks ◽  
Redox Activity ◽  
High Electrical Conductivity ◽  
Limit Of Determination ◽  
Metal Organic ◽  
Amperometric Sensing ◽  
Excellent Reproducibility

An electrochemical sensor for paracetamol is executed by using conductive MOF (NiCu-CAT), which is synthesized by 2, 3, 6, 7, 10, 11-hexahydroxytriphenylene (HHTP) ligand. The utility of this 2D NiCu-CAT is measured by the detection of paracetamol, p-stacking within the MOF layers is essential to achieve high electrical conductivity, redox activity, and catalytic activity. In particular, NiCu-CAT demonstrated detection Limit of determination near 5μM for paracetamol through a wide concentration range (5–190 μM). The NiCu-CAT/GCE exhibits excellent reproducibility, stability, and interference for paracetamol.

Tuning the Redox Activity of Metal−Organic Frameworks for Enhanced, Selective O2 Binding

2019 ◽  
Author(s):  
Andrew Rosen ◽  
M. Rasel Mian ◽  
Timur Islamoglu ◽  
Haoyuan Chen ◽  
Omar Farha ◽  
...  
Keyword(s):  
Density Functional ◽  
Metal Organic Frameworks ◽  
Redox Activity ◽  
Screening Methods ◽  
Bridging Ligands ◽  
Metal Centers ◽  
Computational Screening ◽  
Open Metal Sites ◽  
Metal Organic ◽  
Unsaturated Metal Sites

<p>Metal−organic frameworks (MOFs) with coordinatively unsaturated metal sites are appealing as adsorbent materials due to their tunable functionality and ability to selectively bind small molecules. Through the use of computational screening methods based on periodic density functional theory, we investigate O<sub>2</sub> and N<sub>2</sub> adsorption at the coordinatively unsaturated metal sites of several MOF families. A variety of design handles are identified that can be used to modify the redox activity of the metal centers, including changing the functionalization of the linkers (replacing oxido donors with sulfido donors), anion exchange of bridging ligands (considering μ-Br<sup>-</sup>, μ-Cl<sup>-</sup>, μ-F<sup>-</sup>, μ-SH<sup>-</sup>, or μ-OH<sup>-</sup> groups), and altering the formal oxidation state of the metal. As a result, we show that it is possible to tune the O<sub>2</sub> affinity at the open metal sites of MOFs for applications involving the strong and/or selective binding of O<sub>2</sub>. In contrast with O<sub>2</sub> adsorption, N<sub>2</sub> adsorption at open metal sites is predicted to be relatively weak across the MOF dataset, with the exception of MOFs containing synthetically elusive V<sup>2+</sup> open metal sites. As one example from the screening study, we predict that exchanging the μ-Cl<sup>-</sup> ligands of M<sub>2</sub>Cl<sub>2</sub>(BBTA) (H<sub>2</sub>BBTA = 1<i>H</i>,5<i>H</i>-benzo(1,2-d:4,5-d′)bistriazole) with μ-OH<sup>-</sup> groups would significantly enhance the strength of O<sub>2</sub> adsorption at the open metal sites without a corresponding increase in the N<sub>2</sub> affinity. Experimental investigation of Co<sub>2</sub>Cl<sub>2</sub>(BBTA) and Co<sub>2</sub>(OH)<sub>2</sub>(BBTA) confirms that the former exhibits only weak physisorption, whereas the latter is capable of chemisorbing O<sub>2</sub> at room temperature. The chemisorption behavior is attributed to the greater electron-donating character of the μ-OH<sup>-</sup><sub> </sub>ligands and the presence of H-bonding interactions between the μ-OH<sup>-</sup> bridging ligands and the O<sub>2</sub> adsorbate.</p>

From Ru nanoparticle-encapsulated metal–organic frameworks to highly catalytically active Cu/Ru nanoparticle-embedded porous carbon

2017 ◽  
Vol 5 (10) ◽  
pp. 4835-4841 ◽  
Author(s):  
Pradip Pachfule ◽  
Xinchun Yang ◽  
Qi-Long Zhu ◽  
Nobuko Tsumori ◽  
Takeyuki Uchida ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
High Temperature ◽  
Porous Carbon ◽  
Metal Organic Frameworks ◽  
Ammonia Borane ◽  
Carbon Composites ◽  
High Catalytic Activity ◽  
Catalytically Active ◽  
Metal Organic

High-temperature pyrolysis of Ru nanoparticle-encapsulated MOF (Ru@HKUST-1) afforded ultrafine Cu/Ru nanoparticle-embedded porous carbon composites (Cu/Ru@C), which show high catalytic activity for ammonia borane hydrolysis.

scholarly journals Cation-Dependent Intrinsic Electrical Conductivity in Isostructural Tetrathiafulvalene-Based Microporous Metal–Organic Frameworks

2015 ◽  
Vol 137 (5) ◽  
pp. 1774-1777 ◽  
Author(s):  
Sarah S. Park ◽  
Eric R. Hontz ◽  
Lei Sun ◽  
Christopher H. Hendon ◽  
Aron Walsh ◽  
...  
Keyword(s):  
Electrical Conductivity ◽  
Metal Organic Frameworks ◽  
Metal Organic

Controllable synthesis of urchin-like hierarchical superstructure MOFs with high catalytic activity and stability

2021 ◽  
Author(s):  
Zhanke Wang ◽  
Lei Ge ◽  
Guangxu Zhang ◽  
Rongrong Gao ◽  
Hao Wang ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
High Activity ◽  
Metal Organic Frameworks ◽  
High Catalytic Activity ◽  
Controllable Synthesis ◽  
Metal Organic ◽  
Self Assembled

A novel dissolution-crystallization strategy was developed to synthesize urchin-like superstructure metal-organic frameworks (MOFs) with self-assembled 1D nanorods. The superstructure MOFs not only inherit the high activity of nano-sized MOFs but...

Porous Monolithic Electrode of Ni3FeN on 3D Graphene for Efficient Oxygen Evolution

2020 ◽  
Vol 20 (8) ◽  
pp. 5175-5181 ◽  
Author(s):  
Ruiqing Li ◽  
Chenyang Xu ◽  
Xiangfen Jiang ◽  
Yoshio Bando ◽  
Xuebin Wang
Keyword(s):  
Electrical Conductivity ◽  
Catalytic Activity ◽  
Oxygen Evolution ◽  
Alkaline Solution ◽  
High Performance ◽  
High Electrical Conductivity ◽  
3D Graphene ◽  
Transition Metal Nitride ◽  
Iron Incorporation ◽  
3D Network

Developing high-performance nonprecious electrocatalysts for oxygen evolution reaction (OER) is of great importance, but it remains a challenge. In this paper, we synthesize a porous monolithic catalytic electrode, which is transition metal nitride, Ni3FeN, constructed on a 3D network-like support of the strutted graphene foam (Ni3FeN/SG). The obtained Ni3FeN/SG electrode shows the excellent catalytic activity and the durability for OER in alkaline solution, owing to iron incorporation, high electrical conductivity and 3D network-like structure of strutted graphene. It requires small overpotential (226 mV) to actuate 10 mA cm−2, superior to most recently developed catalysts and commercial RuO2. The fabrication strategy provides a substantial way to expand 3D porous monolithic electrodes for various electrocatalytic applications.

Polymorphous Indium Metal–Organic Frameworks Based on a Ferrocene Linker: Redox Activity, Porosity, and Structural Diversity

2020 ◽  
Vol 59 (14) ◽  
pp. 9969-9978 ◽  
Author(s):  
Jannik Benecke ◽  
Erik Svensson Grape ◽  
Alexander Fuß ◽  
Stephan Wöhlbrandt ◽  
Tobias A. Engesser ◽  
...  
Keyword(s):  
Metal Organic Frameworks ◽  
Structural Diversity ◽  
Redox Activity ◽  
Metal Organic ◽  
Indium Metal

scholarly journals Electrical conductivity and magnetic bistability in metal–organic frameworks and coordination polymers: charge transport and spin crossover at the nanoscale

2020 ◽  
Vol 49 (15) ◽  
pp. 5601-5638 ◽  
Author(s):  
Víctor Rubio-Giménez ◽  
Sergio Tatay ◽  
Carlos Martí-Gastaldo
Keyword(s):  
Electrical Conductivity ◽  
Charge Transport ◽  
Coordination Polymers ◽  
Spin Crossover ◽  
Electronic Devices ◽  
Metal Organic Frameworks ◽  
Active Components ◽  
Metal Organic

This review aims to reassess the progress, issues and opportunities in the path towards integrating conductive and magnetically bistable coordination polymers and metal–organic frameworks as active components in electronic devices.

Enzyme encapsulation in metal–organic frameworks for applications in catalysis

CrystEngComm ◽  
2017 ◽  
Vol 19 (29) ◽  
pp. 4082-4091 ◽  
Author(s):  
Marek B. Majewski ◽  
Ashlee J. Howarth ◽  
Peng Li ◽  
Michael R. Wasielewski ◽  
Joseph T. Hupp ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Metal Organic Frameworks ◽  
Enzyme Encapsulation ◽  
Metal Organic

Various methods for encapsulating enzymes in metal–organic frameworks are discussed and the catalytic activity of biocomposites prepared using these methods is highlighted.

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