Program
Chemical and Biological Engineering
College
Engineering
Student Level
Master's
Location
Student Union Building, Ballroom C
Start Date
8-11-2021 11:00 AM
End Date
8-11-2021 1:00 PM
Abstract
Highly Durable Doped Barium Niobate Perovskite Electrodes for Electrochemical Oxidative Coupling of Methane Luke H. Denoyer1,2, Kyle J Troche Angelica Benavidez1, Fernando H. Garzon*,1,2, Kannan P. Ramaiyan*,1,2 1 Primary Affiliation: University of New Mexico Contact: ldenoyer@unm.edu 2 CISTAR/NSF Abstract Recently discovered large, and unused shale gas reserves provide an inexpensive methane source which is unfortunately difficult to transport in an economically viable manner. Hence, the on-site conversion of methane to ethylene for better utilization of the trapped methane gas is highly intriguing. Our studies here focus on the electrochemical oxidative coupling of methane (EC-OCM), which aims to convert methane using an electrochemically controlled supply of oxide ions within the cell's environment. Essentially, cell potentials are varied within the system, allowing for regulation on the selectivity of methane to ethylene while using the solid electrode-electrolyte system. Recently, Sr2¬Fe1.5+0.075Mo0.5¬O6-δ (SFMO-075Fe) electrodes have been used for EC-OCM towards ethylene production, with high selectivity. [1] Using numerous characterization methods, our group has deduced new findings about the chemical instability of this spinel material in environments suitable for methane conversion at ≈ 850 oC. [2] However, we also observed that at specific applied overpotentials, ethylene could be produced selectively at 70% faradaic efficiency, along with creation of energy that may be extracted for further use. The short lifespan and crystalline structure collapse of this electrocatalyst reinforced us to search for an electrode material with greater longevity in methane environments. Thus, we prepared an iron doped Barium magnesium niobate (BMNF) perovskite electrode that has previously shown chemical stability in conditions relevant for EC-OCM. Upon stability testing using XRD, TGA and TPO measurements, BMNF appears to maintain crystalline structure for long cycles (>100 hours) in methane environments. The electrochemical methods used for EC-OCM analysis included cyclic voltammetry, chronoamperometry and impedance measurements. The electrocatalyst was primarily assessed in terms of ability to convert methane to ethylene without the formation of over-oxidation products, such as CO2¬. Here we report our findings with BMNF perovskites towards EC-OCM and discuss ways to further improve their activity to prepare a catalyst that is entirely suitable for EC-OCM applications.
Luke's Poster
Highly Durable Doped Barium Niobate Perovskite Electrodes for Electrochemical Oxidative Coupling of Methane
Student Union Building, Ballroom C
Highly Durable Doped Barium Niobate Perovskite Electrodes for Electrochemical Oxidative Coupling of Methane Luke H. Denoyer1,2, Kyle J Troche Angelica Benavidez1, Fernando H. Garzon*,1,2, Kannan P. Ramaiyan*,1,2 1 Primary Affiliation: University of New Mexico Contact: ldenoyer@unm.edu 2 CISTAR/NSF Abstract Recently discovered large, and unused shale gas reserves provide an inexpensive methane source which is unfortunately difficult to transport in an economically viable manner. Hence, the on-site conversion of methane to ethylene for better utilization of the trapped methane gas is highly intriguing. Our studies here focus on the electrochemical oxidative coupling of methane (EC-OCM), which aims to convert methane using an electrochemically controlled supply of oxide ions within the cell's environment. Essentially, cell potentials are varied within the system, allowing for regulation on the selectivity of methane to ethylene while using the solid electrode-electrolyte system. Recently, Sr2¬Fe1.5+0.075Mo0.5¬O6-δ (SFMO-075Fe) electrodes have been used for EC-OCM towards ethylene production, with high selectivity. [1] Using numerous characterization methods, our group has deduced new findings about the chemical instability of this spinel material in environments suitable for methane conversion at ≈ 850 oC. [2] However, we also observed that at specific applied overpotentials, ethylene could be produced selectively at 70% faradaic efficiency, along with creation of energy that may be extracted for further use. The short lifespan and crystalline structure collapse of this electrocatalyst reinforced us to search for an electrode material with greater longevity in methane environments. Thus, we prepared an iron doped Barium magnesium niobate (BMNF) perovskite electrode that has previously shown chemical stability in conditions relevant for EC-OCM. Upon stability testing using XRD, TGA and TPO measurements, BMNF appears to maintain crystalline structure for long cycles (>100 hours) in methane environments. The electrochemical methods used for EC-OCM analysis included cyclic voltammetry, chronoamperometry and impedance measurements. The electrocatalyst was primarily assessed in terms of ability to convert methane to ethylene without the formation of over-oxidation products, such as CO2¬. Here we report our findings with BMNF perovskites towards EC-OCM and discuss ways to further improve their activity to prepare a catalyst that is entirely suitable for EC-OCM applications.
