Hydrothermal synthesis of manganese phosphate/graphene foam composite for electrochemical supercapacitor applications.

Title Hydrothermal synthesis of manganese phosphate/graphene foam composite for electrochemical supercapacitor applications.
Authors A.Abdallah Mirghni; M.Jack Madito; T.Moureen Masikhwa; K.O. Oyedotun; A. Bello; N. Manyala
Journal J Colloid Interface Sci
DOI 10.1016/j.jcis.2017.01.098
Abstract

Manganese phosphate (Mn3(PO4)2 hexagonal micro-rods and (Mn3(PO4)2 with different graphene foam (GF) mass loading up to 150mg were prepared by facile hydrothermal method. The characterization of the as-prepared samples proved the successful synthesis of Mn3(PO4)2 hexagonal micro-rods and Mn3(PO4)2/GF composites. It was observed that the specific capacitance of Mn3(PO4)2/GF composites with different GF mass loading increases with mass loading up to 100mg, and then decreases with increasing mass loading up to 150mg. The specific capacitance of Mn3(PO4)2/100mg GF electrode was calculated to be 270Fg(-1) as compared to 41Fg(-1) of the pristine sample at a current density of 0.5Ag(-1) in a three-electrode cell configuration using 6M KOH. Furthermore, the electrochemical performance of the Mn3(PO4)2/100mg GF electrode was evaluated in a two-electrode asymmetric cell device where Mn3(PO4)2/100mg GF electrode was used as a positive electrode and activated carbon (AC) from coconut shell as a negative electrode. AC//Mn3(PO4)2/100mg GF asymmetric cell device was tested within the potential window of 0.0-1.4V, and showed excellent cycling stability with 96% capacitance retention over 10,000 galvanostatic charge-discharge cycles at a current density of 2Ag(-1).

Citation A.Abdallah Mirghni; M.Jack Madito; T.Moureen Masikhwa; K.O. Oyedotun; A. Bello; N. Manyala.Hydrothermal synthesis of manganese phosphate/graphene foam composite for electrochemical supercapacitor applications.. J Colloid Interface Sci. 2017;494:325337. doi:10.1016/j.jcis.2017.01.098

Related Elements

Manganese

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Phosphorus

Phosphorus Bohr ModelSee more Phosphorus products. Phosphorus (atomic symbol: P, atomic number: 15) is a Block P, Group 15, Period 3 element. The number of electrons in each of Phosphorus's shells is 2, 8, 5 and its electronic configuration is [Ne] 3s2 3p3. The phosphorus atom has a radius of 110.5.pm and its Van der Waals radius is 180.pm. Phosphorus is a highly-reactive non-metallic element (sometimes considered a metalloid) with two primary allotropes, white phosphorus and red phosphorus its black flaky appearance is similar to graphitic carbon. Compound forms of phosphorus include phosphates and phosphides. Phosphorous was first recognized as an element by Hennig Brand in 1669 its name (phosphorus mirabilis, or "bearer of light") was inspired from the brilliant glow emitted by its distillation.

Carbon

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