Cobalt (III) oxide and mixed cobalt(III) oxide - Tin oxide for oxygen evolution reaction in alkaline media
Само за регистроване кориснике
2022
Аутори
Stanković, TatjanaMilikić, Jadranka
Knežević, Sara
Ognjanović, Miloš
Stanković, Dalibor
Šljukić, Biljana
Конференцијски прилог (Објављена верзија)
Метаподаци
Приказ свих података о документуАпстракт
Electrochemical water dissociation involves two reactions: the hydrogen evolution reaction (HER) and the oxygen evolution reaction (OER), at the cathode and anode, respectively [1]. Water electrolysis could be sustainable and clean production of hydrogen as fuel, but HER and OER rates need to be improved for industrial applications. The OER involves the transport of four electrons which requires a high overvoltage to reach a satisfactory current density [1]. OER: 4OH- → 2H2O + O2 + 4e- Numerous studies have been focused on synthesizing high-performance and low-cost anode materials [2]. Metal oxides and metal chalcogenides are recognized as promising electrocatalysts for OER [3]. They can be synthesized using various methods with a wide range of precursors. Herein cobalt (III) oxide (Co3O4) and cobalt (III) oxide combined with tin oxide (Co3O4/SnO2) were examined for OER in alkaline media by linear sweep voltammetry (LSV). A three-electrode system was used for electrochemical exam...ination where saturated calomel electrode (SCE) and graphite rod were set as reference and counter electrodes, while Co3O4 and Co3O4/SnO2 were used as the working electrodes. All potentials in this paper were given versus reversible hydrogen electrode (RHE). Fig. 1 shows OER polarization curves of Co3O4 and Co3O4/SnO2 electrocatalysts in alkaline media where both electrocatalysts showed high OER activity. Still, Co3O4/SnO2 gave an almost three times higher OER current density of 98 mA cm-2 than Co3O4 electrocatalyst (30 mA cm-2) at 1.85 V. Tafel slopes were found to be 207 and 156 mV dec-1 for Co3O4 and Co3O4/SnO2 electrocatalysts, respectively. A lower slope means that less overpotential is required to get a high current. In this case, Co3O4/SnO2 has a lower Tafel’s slope which indicates synergetic effect of coupling two metal oxides when it comes to electro-oxidation of oxygen in alkaline media [1]. The iridium (IV) and ruthenium (IV) oxides (IrO2 and RuO2) as the best OER electrocatalysts but with low OER durability and high cost [1] could potentially be replaced with here tested Co3O4 and Co3O4/SnO2 electrocatalysts because of their low-cost synthesis, and high OER activity in alkaline media.
Извор:
Open Readings 2022 : 65th International conference for students of Physics and Natural sciences : the book of abstracts; March 15-18;, 2022, 365-Издавач:
- Vilnius University
Финансирање / пројекти:
- Министарство науке, технолошког развоја и иновација Републике Србије, институционално финансирање - 200146 (Универзитет у Београду, Факултет за физичку хемију) (RS-MESTD-inst-2020-200146)
Напомена:
- Online event
Институција/група
VinčaTY - CONF AU - Stanković, Tatjana AU - Milikić, Jadranka AU - Knežević, Sara AU - Ognjanović, Miloš AU - Stanković, Dalibor AU - Šljukić, Biljana PY - 2022 UR - https://vinar.vin.bg.ac.rs/handle/123456789/11662 AB - Electrochemical water dissociation involves two reactions: the hydrogen evolution reaction (HER) and the oxygen evolution reaction (OER), at the cathode and anode, respectively [1]. Water electrolysis could be sustainable and clean production of hydrogen as fuel, but HER and OER rates need to be improved for industrial applications. The OER involves the transport of four electrons which requires a high overvoltage to reach a satisfactory current density [1]. OER: 4OH- → 2H2O + O2 + 4e- Numerous studies have been focused on synthesizing high-performance and low-cost anode materials [2]. Metal oxides and metal chalcogenides are recognized as promising electrocatalysts for OER [3]. They can be synthesized using various methods with a wide range of precursors. Herein cobalt (III) oxide (Co3O4) and cobalt (III) oxide combined with tin oxide (Co3O4/SnO2) were examined for OER in alkaline media by linear sweep voltammetry (LSV). A three-electrode system was used for electrochemical examination where saturated calomel electrode (SCE) and graphite rod were set as reference and counter electrodes, while Co3O4 and Co3O4/SnO2 were used as the working electrodes. All potentials in this paper were given versus reversible hydrogen electrode (RHE). Fig. 1 shows OER polarization curves of Co3O4 and Co3O4/SnO2 electrocatalysts in alkaline media where both electrocatalysts showed high OER activity. Still, Co3O4/SnO2 gave an almost three times higher OER current density of 98 mA cm-2 than Co3O4 electrocatalyst (30 mA cm-2) at 1.85 V. Tafel slopes were found to be 207 and 156 mV dec-1 for Co3O4 and Co3O4/SnO2 electrocatalysts, respectively. A lower slope means that less overpotential is required to get a high current. In this case, Co3O4/SnO2 has a lower Tafel’s slope which indicates synergetic effect of coupling two metal oxides when it comes to electro-oxidation of oxygen in alkaline media [1]. The iridium (IV) and ruthenium (IV) oxides (IrO2 and RuO2) as the best OER electrocatalysts but with low OER durability and high cost [1] could potentially be replaced with here tested Co3O4 and Co3O4/SnO2 electrocatalysts because of their low-cost synthesis, and high OER activity in alkaline media. PB - Vilnius University C3 - Open Readings 2022 : 65th International conference for students of Physics and Natural sciences : the book of abstracts; March 15-18; T1 - Cobalt (III) oxide and mixed cobalt(III) oxide - Tin oxide for oxygen evolution reaction in alkaline media SP - 365 UR - https://hdl.handle.net/21.15107/rcub_vinar_11662 ER -
@conference{ author = "Stanković, Tatjana and Milikić, Jadranka and Knežević, Sara and Ognjanović, Miloš and Stanković, Dalibor and Šljukić, Biljana", year = "2022", abstract = "Electrochemical water dissociation involves two reactions: the hydrogen evolution reaction (HER) and the oxygen evolution reaction (OER), at the cathode and anode, respectively [1]. Water electrolysis could be sustainable and clean production of hydrogen as fuel, but HER and OER rates need to be improved for industrial applications. The OER involves the transport of four electrons which requires a high overvoltage to reach a satisfactory current density [1]. OER: 4OH- → 2H2O + O2 + 4e- Numerous studies have been focused on synthesizing high-performance and low-cost anode materials [2]. Metal oxides and metal chalcogenides are recognized as promising electrocatalysts for OER [3]. They can be synthesized using various methods with a wide range of precursors. Herein cobalt (III) oxide (Co3O4) and cobalt (III) oxide combined with tin oxide (Co3O4/SnO2) were examined for OER in alkaline media by linear sweep voltammetry (LSV). A three-electrode system was used for electrochemical examination where saturated calomel electrode (SCE) and graphite rod were set as reference and counter electrodes, while Co3O4 and Co3O4/SnO2 were used as the working electrodes. All potentials in this paper were given versus reversible hydrogen electrode (RHE). Fig. 1 shows OER polarization curves of Co3O4 and Co3O4/SnO2 electrocatalysts in alkaline media where both electrocatalysts showed high OER activity. Still, Co3O4/SnO2 gave an almost three times higher OER current density of 98 mA cm-2 than Co3O4 electrocatalyst (30 mA cm-2) at 1.85 V. Tafel slopes were found to be 207 and 156 mV dec-1 for Co3O4 and Co3O4/SnO2 electrocatalysts, respectively. A lower slope means that less overpotential is required to get a high current. In this case, Co3O4/SnO2 has a lower Tafel’s slope which indicates synergetic effect of coupling two metal oxides when it comes to electro-oxidation of oxygen in alkaline media [1]. The iridium (IV) and ruthenium (IV) oxides (IrO2 and RuO2) as the best OER electrocatalysts but with low OER durability and high cost [1] could potentially be replaced with here tested Co3O4 and Co3O4/SnO2 electrocatalysts because of their low-cost synthesis, and high OER activity in alkaline media.", publisher = "Vilnius University", journal = "Open Readings 2022 : 65th International conference for students of Physics and Natural sciences : the book of abstracts; March 15-18;", title = "Cobalt (III) oxide and mixed cobalt(III) oxide - Tin oxide for oxygen evolution reaction in alkaline media", pages = "365", url = "https://hdl.handle.net/21.15107/rcub_vinar_11662" }
Stanković, T., Milikić, J., Knežević, S., Ognjanović, M., Stanković, D.,& Šljukić, B.. (2022). Cobalt (III) oxide and mixed cobalt(III) oxide - Tin oxide for oxygen evolution reaction in alkaline media. in Open Readings 2022 : 65th International conference for students of Physics and Natural sciences : the book of abstracts; March 15-18; Vilnius University., 365. https://hdl.handle.net/21.15107/rcub_vinar_11662
Stanković T, Milikić J, Knežević S, Ognjanović M, Stanković D, Šljukić B. Cobalt (III) oxide and mixed cobalt(III) oxide - Tin oxide for oxygen evolution reaction in alkaline media. in Open Readings 2022 : 65th International conference for students of Physics and Natural sciences : the book of abstracts; March 15-18;. 2022;:365. https://hdl.handle.net/21.15107/rcub_vinar_11662 .
Stanković, Tatjana, Milikić, Jadranka, Knežević, Sara, Ognjanović, Miloš, Stanković, Dalibor, Šljukić, Biljana, "Cobalt (III) oxide and mixed cobalt(III) oxide - Tin oxide for oxygen evolution reaction in alkaline media" in Open Readings 2022 : 65th International conference for students of Physics and Natural sciences : the book of abstracts; March 15-18; (2022):365, https://hdl.handle.net/21.15107/rcub_vinar_11662 .