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01 Apr 08:17

Recent Advances of Two‐Dimensional Nanomaterials for Electrochemical Capacitors

by Tingting Huang, Yuan Jiang, Guozhen Shen, Di Chen
Recent Advances of Two‐Dimensional Nanomaterials for Electrochemical Capacitors

Peeling back the layers: The electrochemical properties and great variety of 2D nanomaterials make them highly attractive candidates for electrochemical capacitors, such as supercapacitors, lithium‐ion capacitors, and sodium‐ion capacitors. Recent research progress in developing 2D nanomaterials for application as high‐performance electrochemical capacitors is reviewed.


Abstract

Two‐dimensional (2D) nanomaterials have drawn a wide range of research interests because of their unique ultrathin layered structures and attractive properties. In particular, the electrochemical properties and great variety of 2D nanomaterials make them highly attractive candidates for electrochemical capacitors, such as supercapacitors, lithium‐ion capacitors, and sodium‐ion capacitors. Herein, a comprehensive review of recent progress towards the application of 2D nanomaterials for electrochemical capacitors is provided. Several typical types of 2D nanomaterials are first briefly introduced, followed by detailed descriptions of their electrochemical capacitor applications. Finally, research perspectives and future research directions of these interesting areas are also provided.

09 Jun 23:59

On thermal stability and catalytic reactivity of Zr-based metal–organic framework (UiO-67) encapsulated Pt catalysts

Publication date: August 2016
Source:Journal of Catalysis, Volume 340
Author(s): Peter Hester, Shaojun Xu, Wei Liang, Nadeen Al-Janabi, Reza Vakili, Patrick Hill, Christopher A. Muryn, Xiaobo Chen, Philip A. Martin, Xiaolei Fan
Pt nanoparticles (NPs, 0.5wt.%) encapsulated in a zirconium-based metal–organic framework (UiO-67 MOF) were synthesized via a linker design method. Thermal behavior of Pt in UiO-67 composite materials was compared with UiO-67 using thermogravimetric and differential thermal analysis (TG-DTA). The results showed that Pt insertion can impair the thermal stability of bulk UiO-67, resulting in a ca. 14% drop in the critical temperature of the thermal decomposition. Temperature-programmed oxidation of materials showed that calcination at 450K was essential to provide a clean framework. Temperature-programmed reduction of materials revealed that the chemisorption of H2 on UiO-67 (at 323K) was evidently enhanced owing to the incorporation of Pt NPs, thus making PtNP@UiO-67 suitable for hydrogenation reactions and hydrogen storage. PtNP@UiO-67 catalyst was evaluated by the oxidation and hydrogenation of 5-hydroxymethylfurfural in aqueous solutions at 363K, showing improved activity and selectivity in hydrogenation reactions.

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06 Jan 23:02

The week in science

The week in science

Nature 529, 7584 (2016). http://www.nature.com/doifinder/10.1038/529007a

Volkswagen sued; Nobel laureate Alfred Gilman dies; and Guinea now free of Ebola.

18 Sep 22:37

Porous CoP concave polyhedron electrocatalysts synthesized from metal-organic frameworks with enhanced electrochemical properties for hydrogen evolution

J. Mater. Chem. A, 2015, 3,21471-21477
DOI: 10.1039/C5TA05018A, Paper
Miao Xu, Lei Han, Yujie Han, You Yu, Junfeng Zhai, Shaojun Dong
Porous CoP concave polyhedrons were prepared by a topological conversion from Co-MOFs with enhanced electrochemical HER activities.
The content of this RSS Feed (c) The Royal Society of Chemistry
02 Jul 01:33

Machine ethics: The robot’s dilemma

by Boer Deng

Machine ethics: The robot’s dilemma

Nature 523, 7558 (2015). http://www.nature.com/doifinder/10.1038/523024a

Author: Boer Deng

Working out how to build ethical robots is one of the thorniest challenges in artificial intelligence.

10 Jun 08:59

A graphene-like MoS2/graphene nanocomposite as a highperformance anode for lithium ion batteries

J. Mater. Chem. A, 2014, 2,13109-13115
DOI: 10.1039/C4TA01644K, Paper
Yongchang Liu, Yanping Zhao, Lifang Jiao, Jun Chen
A graphene-like MoS2/graphene nanocomposite exhibits excellent electrochemical performance with high capacity, high rate capability and good cyclability as the anode for lithium-ion batteries.
The content of this RSS Feed (c) The Royal Society of Chemistry