TY - JOUR
T1 - Quaternary transition metal molybdate (Mn 0.25Ni0.25Co0.25Fe0.25MoO4) design to improve the kinetics of the redox reaction in supercapacitors
AU - Appiagyei, Alfred Bekoe
AU - Han, Jeong In
N1 - Publisher Copyright:
© 2020 Elsevier Ltd and Techna Group S.r.l.
PY - 2020/6/1
Y1 - 2020/6/1
N2 - In this work, we report on a new Mn0.25Ni0.25Co0.25Fe0.25MoO4 (denoted as MNCFMo) material synthesized by a one-step hydrothermal method and studied the electrochemical performance of this quaternary molybdate as a pseudocapacitive material. The exact formation of the structure was confirmed with the aid of X-Ray Diffraction (XRD), Scanning Electron Microscopy (SEM), X-ray Photoelectron Spectroscopy (XPS) and Transmission Electron Microscopy (TEM) which reveal a pure crystal structure and nanorods-like morphology with the expected elemental composition. At current density of 2 A/g, MNCFMo exhibited promising electrochemical performance with calculated specific capacitance up to 1097 F/g compared to 897 F/g for Mn0.33Ni0.33Co0.33MoO4 (denoted as MNCMo) and could maintain a high capacitance of 413.6 F/g even at 40 A/g signifying an excellent rate material, which are ascribed to the additional fast reversible reaction offered by iron (Fe) insertion. Remarkably, the energy density could reach up to 38.1 Wh/kg at power density of 322.8 W/kg. Moreover, this material delivers a superior cycling stability with approximately 20% capacity loss after 5000 cycles at 10 A/g. Electrochemical impedance spectroscopy results reveal low solution resistance (Rs) of 0.307 Ω and charge transfer resistance (Rct) of 12.40 Ω respectively. These profound outputs are attributed to the cumulative redox effects from Mn, Ni, Co and Fe implying a high consideration for MNCFMo as an electrode in advanced supercapacitor application.
AB - In this work, we report on a new Mn0.25Ni0.25Co0.25Fe0.25MoO4 (denoted as MNCFMo) material synthesized by a one-step hydrothermal method and studied the electrochemical performance of this quaternary molybdate as a pseudocapacitive material. The exact formation of the structure was confirmed with the aid of X-Ray Diffraction (XRD), Scanning Electron Microscopy (SEM), X-ray Photoelectron Spectroscopy (XPS) and Transmission Electron Microscopy (TEM) which reveal a pure crystal structure and nanorods-like morphology with the expected elemental composition. At current density of 2 A/g, MNCFMo exhibited promising electrochemical performance with calculated specific capacitance up to 1097 F/g compared to 897 F/g for Mn0.33Ni0.33Co0.33MoO4 (denoted as MNCMo) and could maintain a high capacitance of 413.6 F/g even at 40 A/g signifying an excellent rate material, which are ascribed to the additional fast reversible reaction offered by iron (Fe) insertion. Remarkably, the energy density could reach up to 38.1 Wh/kg at power density of 322.8 W/kg. Moreover, this material delivers a superior cycling stability with approximately 20% capacity loss after 5000 cycles at 10 A/g. Electrochemical impedance spectroscopy results reveal low solution resistance (Rs) of 0.307 Ω and charge transfer resistance (Rct) of 12.40 Ω respectively. These profound outputs are attributed to the cumulative redox effects from Mn, Ni, Co and Fe implying a high consideration for MNCFMo as an electrode in advanced supercapacitor application.
KW - Capacitance
KW - Hydrothermal
KW - MnNiCoFeMoO
KW - Nanorods
KW - Quaternary molybdate
KW - Supercapacitors
UR - http://www.scopus.com/inward/record.url?scp=85079046234&partnerID=8YFLogxK
U2 - 10.1016/j.ceramint.2020.02.004
DO - 10.1016/j.ceramint.2020.02.004
M3 - Article
AN - SCOPUS:85079046234
SN - 0272-8842
VL - 46
SP - 12422
EP - 12429
JO - Ceramics International
JF - Ceramics International
IS - 8
ER -