Date of Award
Spring 5-14-2022
Document Type
Thesis
Degree Name
Master of Science in Materials Science and Engineering (MSMSE)
Department
Physics
First Advisor
Ram Gupta
Second Advisor
Khamis Siam
Third Advisor
Serif Uran
Keywords
hydrogen, energy, electrolysis, HER, OER, supercapacitor, psuedocapacitor, transition metal oxides, transition metal sulfides, transition metal phosphides
Abstract
In contemporary society, there are many different ways that energy is used in daily life. From applications that require a high energy density to long-term storage in a stable manner, the requirements for energy usage are diverse. Therefore, the greater the number of uses a designed material exhibits, the more practical it may be for wide-scale manufacture. Two areas of particular interest for energy applications are fuel cells (to generate energy) and supercapacitors (to store energy). To provide cheaper and more durable alternatives for energy storage, electrodes containing CoMoO4, NiMoO4, CoMoS4, NiMoS4, CoMoP, and NIMoP were synthesized. The electrodes were synthesized through a hydrothermal method using Ni-foam as the substrate then tested as electrocatalysts for water splitting and electrodes for supercapacitor. As an electrocatalyst for hydrogen evolution reaction, NiMoS4 displayed the lowest overpotential of 148 mV with a Tafel slope of 159 mV/dec. On the other hand, CoMoS4 showed the lowest overpotential of 189 mV with a Tafel slope of 78 mV/dec among all four samples for oxygen evolution reactions. In terms of energy storage, the CoMoO4 had the highest specific capacitance of 2652 F/g at a current density of 0.5 A/g with an averaged charge retention of 91% and a Coulombic efficiency of 99% after 10,000 cycles.
Recommended Citation
Thompson, Kelsey, "TRANSISTION METAL CHALCOGENIDES AND PHOSPHIDES FOR ENERGY STORAGE AND CONVERSION THROUGH WATER SPLITTING" (2022). Electronic Theses & Dissertations. 396.
https://digitalcommons.pittstate.edu/etd/396
