Ice-templated Self-assembly of VOPO4-Graphene Nanocomposites for Vertically Porous 3D Supercapacitor Electrodes

Scientific Reports
Kwang Hoon LeeJeong Gon Son

Abstract

A simple ice-templated self-assembly process is used to prepare a three-dimensional (3D) and vertically porous nanocomposite of layered vanadium phosphates (VOPO4) and graphene nanosheets with high surface area and high electrical conductivity. The resulting 3D VOPO4-graphene nanocomposite has a much higher capacitance of 527.9 F g(-1) at a current density of 0.5 A g(-1), compared with ~247 F g(-1) of simple 3D VOPO4, with solid cycling stability. The enhanced pseudocapacitive behavior mainly originates from vertically porous structures from directionally grown ice crystals and simultaneously inducing radial segregation and forming inter-stacked structures of VOPO4-graphene nanosheets. This VOPO4-graphene nanocomposite electrode exhibits high surface area, vertically porous structure to the separator, structural stability from interstacked structure and high electrical conductivity, which would provide the short diffusion paths of electrolyte ions and fast transportation of charges within the conductive frameworks. In addition, an asymmetric supercapacitor (ASC) is fabricated by using vertically porous VOPO4-graphene as the positive electrode and vertically porous 3D graphene as the negative electrode; it exhibits a wide cell v...Continue Reading

References

Aug 2, 2008·Science·John R Miller, Patrice Simon
Oct 29, 2008·Nature Materials·Patrice Simon, Yury Gogotsi
May 7, 2010·Journal of the American Chemical Society·Hailiang WangHongjie Dai
Jul 23, 2011·Chemical Society Reviews·Guoping WangJiujun Zhang
Dec 6, 2012·Nature Communications·Ling QiuDan Li
Jun 15, 2013·Advanced Materials·Yongji GongPulickel M Ajayan
Dec 10, 2013·Chemphyschem : a European Journal of Chemical Physics and Physical Chemistry·Hui ZhangXingyou Tian
Mar 15, 2014·Dalton Transactions : an International Journal of Inorganic Chemistry·Kai DaiHeng Wang
Jun 26, 2014·Chemical Communications : Chem Comm·Jingxiang LowSwelm Wageh
Aug 12, 2014·Chemical Communications : Chem Comm·Bao ZhangHui Li

❮ Previous
Next ❯

Citations

Aug 30, 2016·ACS Applied Materials & Interfaces·Christian StolzeUlrich S Schubert
Nov 9, 2018·Chemical Communications : Chem Comm·Guang HeArumugam Manthiram
Sep 16, 2020·Advanced Materials·Kayeon KeumJeong Sook Ha

❮ Previous
Next ❯

Methods Mentioned

BETA
atomic force microscopy
X-ray
scanning electron microscopy
AFM

Related Concepts

Trending Feeds

COVID-19

Coronaviruses encompass a large family of viruses that cause the common cold as well as more serious diseases, such as the ongoing outbreak of coronavirus disease 2019 (COVID-19; formally known as 2019-nCoV). Coronaviruses can spread from animals to humans; symptoms include fever, cough, shortness of breath, and breathing difficulties; in more severe cases, infection can lead to death. This feed covers recent research on COVID-19.

Blastomycosis

Blastomycosis fungal infections spread through inhaling Blastomyces dermatitidis spores. Discover the latest research on blastomycosis fungal infections here.

Nuclear Pore Complex in ALS/FTD

Alterations in nucleocytoplasmic transport, controlled by the nuclear pore complex, may be involved in the pathomechanism underlying multiple neurodegenerative diseases including Amyotrophic Lateral Sclerosis and Frontotemporal Dementia. Here is the latest research on the nuclear pore complex in ALS and FTD.

Applications of Molecular Barcoding

The concept of molecular barcoding is that each original DNA or RNA molecule is attached to a unique sequence barcode. Sequence reads having different barcodes represent different original molecules, while sequence reads having the same barcode are results of PCR duplication from one original molecule. Discover the latest research on molecular barcoding here.

Chronic Fatigue Syndrome

Chronic fatigue syndrome is a disease characterized by unexplained disabling fatigue; the pathology of which is incompletely understood. Discover the latest research on chronic fatigue syndrome here.

Evolution of Pluripotency

Pluripotency refers to the ability of a cell to develop into three primary germ cell layers of the embryo. This feed focuses on the mechanisms that underlie the evolution of pluripotency. Here is the latest research.

Position Effect Variegation

Position Effect Variagation occurs when a gene is inactivated due to its positioning near heterochromatic regions within a chromosome. Discover the latest research on Position Effect Variagation here.

STING Receptor Agonists

Stimulator of IFN genes (STING) are a group of transmembrane proteins that are involved in the induction of type I interferon that is important in the innate immune response. The stimulation of STING has been an active area of research in the treatment of cancer and infectious diseases. Here is the latest research on STING receptor agonists.

Microbicide

Microbicides are products that can be applied to vaginal or rectal mucosal surfaces with the goal of preventing, or at least significantly reducing, the transmission of sexually transmitted infections. Here is the latest research on microbicides.