Fast acid-leaching strategy treated hollow cobalt-carbon materials as high-efficient electrochemical catalysts for Zn-air batteries

2021 ◽  
Author(s):  
Jun Yang ◽  
Jilan Long ◽  
Cheng Chen ◽  
Guang-Ming Liang ◽  
Bing Tang ◽  
...  
Keyword(s):  
Carbon Materials ◽  
Metal Organic Frameworks ◽  
Acid Leaching ◽  
High Density ◽  
Metal Centers ◽  
High Efficient ◽  
Metal Organic ◽  
Electrochemical Catalysts ◽  
Carbon Based

Metal-organic frameworks (MOFs) are employed as ideal calcining templates for the synthesis of high-efficient metal-carbon based ORR and OER catalysts. However, owing to the high density of metal centers, MOFs...

Design of Hollow Carbon-based Materials Derived from Metal–Organic Frameworks for Electrocatalysis and Electrochemical Energy Storage

2021 ◽  
Author(s):  
Huan Pang ◽  
Wenhui Hu ◽  
Mingbo Zheng ◽  
Bingyan Xu ◽  
Ying Wei ◽  
...  
Keyword(s):  
Carbon Materials ◽  
Electrochemical Reaction ◽  
Metal Organic Frameworks ◽  
Metal Nanoparticle ◽  
Internal Cavity ◽  
Transport Path ◽  
Metal Organic ◽  
Hollow Carbon ◽  
Carbon Based Nanomaterials ◽  
Carbon Based

Hollow nanostructured materials are suitable for electrochemical reaction because of their unique internal cavity and short transport path. Carbon-based nanomaterials, including simplex carbon materials, heteroatom-doped carbon materials, carbon–transition metal nanoparticle...

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>

Vapor-assisted self-conversion of basic carbonates in metal–organic frameworks

Nanoscale ◽  
2021 ◽  
Vol 13 (9) ◽  
pp. 5069-5076
Author(s):  
Miaomiao Jia ◽  
Jingyi Su ◽  
Pengcheng Su ◽  
Wanbin Li
Keyword(s):  
Carbon Capture ◽  
Metal Organic Frameworks ◽  
Solvent Vapor ◽  
Metal Centers ◽  
Metal Organic ◽  
High Alkalinity

Basic carbonates with high alkalinity are incorporated into metal–organic frameworks by solvent vapor-assisted self-conversion of partial metal centers to improve carbon capture performance.

High efficiency LaOCl supported Fe-Fe3C-based catalyst for hydrogenation of nitroarenes fabricated by coordination-assisted-pyrolysis

2021 ◽  
Author(s):  
Xuewei Li ◽  
Wei She ◽  
Jing Wang ◽  
Weizuo Li ◽  
Guangming Li
Keyword(s):  
High Efficiency ◽  
Metal Organic Frameworks ◽  
Efficient Catalyst ◽  
Considerable Potential ◽  
Highly Efficient ◽  
Hydrogenation Reactions ◽  
Metal Organic ◽  
Carbon Based

Bi-metal organic frameworks (Bi-MOFs) derived carbon-based catalysts have exhibited the considerable potential for hydrogenation reactions. However, designing a suitable bi-MOF to fabricate the highly efficient catalyst is still great challenge....

Tuning the electrochemical and catalytic ORR performance of C60 by its encapsulation in ZIF-8: a solid-state analogue of dilute fullerene solution

2021 ◽  
Vol 5 (20) ◽  
pp. 7654-7665
Author(s):  
Olivia Basu ◽  
Subhabrata Mukhopadhyay ◽  
Avik De ◽  
Anupam Das ◽  
Samar K. Das
Keyword(s):  
Solid State ◽  
Active Sites ◽  
Metal Organic Frameworks ◽  
Electrochemical Activity ◽  
High Density ◽  
Fullerene Solution ◽  
Metal Organic ◽  
Significant Attention

Hassle-free encapsulation of fullerene C60 in ZIF-8 has been performed to preserve the molecularity and solution-like properties of C60 in solid-state. The resulting composite shows efficient heterogeneous electrocatalytic oxygen reduction reaction.

Design and synthesis of nanoporous carbon materials using Cd-based homochiral metal–organic frameworks as precursors for supercapacitor application

CrystEngComm ◽  
2018 ◽  
Vol 20 (31) ◽  
pp. 4364-4369 ◽  
Author(s):  
Guangju Zhang ◽  
Siqi Xiu ◽  
Ying Wei ◽  
Qingguo Zhang ◽  
Kedi Cai
Keyword(s):  
Carbon Materials ◽  
Metal Organic Frameworks ◽  
Nanoporous Carbon ◽  
Supercapacitor Application ◽  
Design And Synthesis ◽  
Metal Organic ◽  
Nanoporous Carbon Materials

Design and synthesis of nanoporous carbon materials using Cd-based homochiral metal–organic frameworks as precursors for supercapacitor application.

Copper fumarate with high-bifunctional nanozyme activities at different pH for glucose and epinephrine colorimetric detection in human serum

The Analyst ◽  
2021 ◽  
Author(s):  
Meihui Ying ◽  
Guizeng Yang ◽  
Yuanjie Xu ◽  
Hui-Ling Ye ◽  
Xing Lin ◽  
...  
Keyword(s):  
Human Serum ◽  
Active Sites ◽  
Colorimetric Detection ◽  
Metal Organic Frameworks ◽  
High Density ◽  
Detection Methods ◽  
Metal Organic

Metal-organic frameworks (MOFs) have attracted extensive attention in the construction of colorimetric detection methods due to their easy modification and high density of active sites. However, most of the reported...

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