Open AccessOne-pot synthesis of manganese oxide/graphene composites via a plasma-enhanced electrochemical exfoliation process for supercapacitors
Author(s) -
Dang Nhat Minh,
Thanh Hải Nguyễn,
To Van Nguyen,
Tran Viet Thu,
Le Hoang Sinh,
Masashi Akabori,
Nobuaki Ito,
Hoàng Văn Nguyễn,
Trong Lu Le,
Tuan Hong Nguyen,
Van Tu Nguyen,
Ngoc Hong Phan
Publication year - 2020
Publication title -
nanotechnology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.926
H-Index - 203
eISSN - 1361-6528
pISSN - 0957-4484
DOI - 10.1088/1361-6528/ab8fe5
Subject(s) - graphene , materials science , supercapacitor , exfoliation joint , raman spectroscopy , graphene oxide paper , oxide , graphite oxide , manganese , x ray photoelectron spectroscopy , scanning electron microscope , electrochemistry , electrode , graphite , chemical engineering , composite material , nanotechnology , metallurgy , chemistry , physics , engineering , optics
In this work, a feasible one-pot approach to synthesize manganese oxide/graphene composites, the so-called plasma-enhanced electrochemical exfoliation process (PE 3 P), has been developed. Herein, a composite of graphene decorated with manganese oxide nanoparticles was prepared via PE 3 P from a KMnO 4 solution and graphite electrode under a voltage of 70 V in an ambient environment. By controlling the initial KMnO 4 concentration, we obtained distinct MnO 2 /graphene samples. The prepared samples were characterized by scanning electron microscopy, transmission electron microscopy, x-ray diffraction, x-ray photoelectron spectroscopy, and Raman spectroscopy. The electrochemical measurements of the MnO 2 /graphene composites revealed that the specific capacitance of the samples is approximately 320 F g –1 at a scan rate of 10 mV s –1 , which is comparably very high for manganese oxide/carbon-based supercapacitor electrode materials. Considering the simple, low-cost, one-step and environmentally friendly preparation, our approach has the potential to be used for the fabrication of MnO 2 /graphene composites as the electrode materials of supercapacitors.