Electrochemical stability of RuO2(110)/Ru(0001) model electrodes in the oxygen and chlorine evolution reactions

Andrey Goryachev, Marco Etzi Coller Pascuzzi, Francesco Carlà, Tim Weber, Herbert Over (Corresponding author), Emiel J.M. Hensen (Corresponding author), Jan Philipp Hofmann (Corresponding author)

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RuO 2 is commercially employed as an anodic catalyst in the chlor-alkali process. It is also one of the most active electrocatalysts for the oxidation of water, relevant to electrochemical water splitting. However, the use of RuO 2 is limited by its low anodic stability under acidic conditions, especially at high overpotentials. In the present work, the electrochemical stability of model RuO 2(110)/Ru(0001) anodes was investigated in order to gain a deeper understanding of the relation between structure and performance in Cl 2 and O 2 evolution reactions (CER and OER, respectively). Online electrochemical mass spectrometry was used to determine the onset potential of CER and OER in HCl and H 2SO 4 electrolytes, respectively. The onset potential of OER was higher in HCl than in H 2SO 4 due to competition with the kinetically more favorable CER. A detailed stability evaluation revealed pitting corrosion of the electrode surface with exposure of Ru(0001) metal substrate concomitant with the formation of a hydrous RuO 2 in some areas regardless of the applied electrochemical treatment. However, despite local pitting, the RuO 2(110) layer preserves its thickness in most areas. Degradation of the electrode was found to be less severe in 0.5 M HCl due to a decrease in the faradaic efficiency of RuO 2 oxidation caused by competition with the kinetically more favorable CER.

Originele taal-2Engels
Artikelnummer135713
Aantal pagina's11
TijdschriftElectrochimica Acta
Volume336
DOI's
StatusGepubliceerd - 10 mrt 2020

Vingerafdruk

Chlorine
Oxygen
Pitting
Electrodes
Oxidation
Water
Electrocatalysts
Alkalies
Electrolytes
Mass spectrometry
Anodes
Metals
Corrosion
Degradation
Catalysts
Substrates

Citeer dit

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title = "Electrochemical stability of RuO2(110)/Ru(0001) model electrodes in the oxygen and chlorine evolution reactions",
abstract = "RuO 2 is commercially employed as an anodic catalyst in the chlor-alkali process. It is also one of the most active electrocatalysts for the oxidation of water, relevant to electrochemical water splitting. However, the use of RuO 2 is limited by its low anodic stability under acidic conditions, especially at high overpotentials. In the present work, the electrochemical stability of model RuO 2(110)/Ru(0001) anodes was investigated in order to gain a deeper understanding of the relation between structure and performance in Cl 2 and O 2 evolution reactions (CER and OER, respectively). Online electrochemical mass spectrometry was used to determine the onset potential of CER and OER in HCl and H 2SO 4 electrolytes, respectively. The onset potential of OER was higher in HCl than in H 2SO 4 due to competition with the kinetically more favorable CER. A detailed stability evaluation revealed pitting corrosion of the electrode surface with exposure of Ru(0001) metal substrate concomitant with the formation of a hydrous RuO 2 in some areas regardless of the applied electrochemical treatment. However, despite local pitting, the RuO 2(110) layer preserves its thickness in most areas. Degradation of the electrode was found to be less severe in 0.5 M HCl due to a decrease in the faradaic efficiency of RuO 2 oxidation caused by competition with the kinetically more favorable CER.",
keywords = "Chlorine evolution reaction, Electrocatalysis, Oxygen evolution reaction, Ruthenium dioxide, Stability",
author = "Andrey Goryachev and {Etzi Coller Pascuzzi}, Marco and Francesco Carl{\`a} and Tim Weber and Herbert Over and Hensen, {Emiel J.M.} and Hofmann, {Jan Philipp}",
year = "2020",
month = "3",
day = "10",
doi = "10.1016/j.electacta.2020.135713",
language = "English",
volume = "336",
journal = "Electrochimica Acta",
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Electrochemical stability of RuO2(110)/Ru(0001) model electrodes in the oxygen and chlorine evolution reactions. / Goryachev, Andrey; Etzi Coller Pascuzzi, Marco; Carlà, Francesco; Weber, Tim; Over, Herbert (Corresponding author); Hensen, Emiel J.M. (Corresponding author); Hofmann, Jan Philipp (Corresponding author).

In: Electrochimica Acta, Vol. 336, 135713, 10.03.2020.

Onderzoeksoutput: Bijdrage aan tijdschriftTijdschriftartikelAcademicpeer review

TY - JOUR

T1 - Electrochemical stability of RuO2(110)/Ru(0001) model electrodes in the oxygen and chlorine evolution reactions

AU - Goryachev, Andrey

AU - Etzi Coller Pascuzzi, Marco

AU - Carlà, Francesco

AU - Weber, Tim

AU - Over, Herbert

AU - Hensen, Emiel J.M.

AU - Hofmann, Jan Philipp

PY - 2020/3/10

Y1 - 2020/3/10

N2 - RuO 2 is commercially employed as an anodic catalyst in the chlor-alkali process. It is also one of the most active electrocatalysts for the oxidation of water, relevant to electrochemical water splitting. However, the use of RuO 2 is limited by its low anodic stability under acidic conditions, especially at high overpotentials. In the present work, the electrochemical stability of model RuO 2(110)/Ru(0001) anodes was investigated in order to gain a deeper understanding of the relation between structure and performance in Cl 2 and O 2 evolution reactions (CER and OER, respectively). Online electrochemical mass spectrometry was used to determine the onset potential of CER and OER in HCl and H 2SO 4 electrolytes, respectively. The onset potential of OER was higher in HCl than in H 2SO 4 due to competition with the kinetically more favorable CER. A detailed stability evaluation revealed pitting corrosion of the electrode surface with exposure of Ru(0001) metal substrate concomitant with the formation of a hydrous RuO 2 in some areas regardless of the applied electrochemical treatment. However, despite local pitting, the RuO 2(110) layer preserves its thickness in most areas. Degradation of the electrode was found to be less severe in 0.5 M HCl due to a decrease in the faradaic efficiency of RuO 2 oxidation caused by competition with the kinetically more favorable CER.

AB - RuO 2 is commercially employed as an anodic catalyst in the chlor-alkali process. It is also one of the most active electrocatalysts for the oxidation of water, relevant to electrochemical water splitting. However, the use of RuO 2 is limited by its low anodic stability under acidic conditions, especially at high overpotentials. In the present work, the electrochemical stability of model RuO 2(110)/Ru(0001) anodes was investigated in order to gain a deeper understanding of the relation between structure and performance in Cl 2 and O 2 evolution reactions (CER and OER, respectively). Online electrochemical mass spectrometry was used to determine the onset potential of CER and OER in HCl and H 2SO 4 electrolytes, respectively. The onset potential of OER was higher in HCl than in H 2SO 4 due to competition with the kinetically more favorable CER. A detailed stability evaluation revealed pitting corrosion of the electrode surface with exposure of Ru(0001) metal substrate concomitant with the formation of a hydrous RuO 2 in some areas regardless of the applied electrochemical treatment. However, despite local pitting, the RuO 2(110) layer preserves its thickness in most areas. Degradation of the electrode was found to be less severe in 0.5 M HCl due to a decrease in the faradaic efficiency of RuO 2 oxidation caused by competition with the kinetically more favorable CER.

KW - Chlorine evolution reaction

KW - Electrocatalysis

KW - Oxygen evolution reaction

KW - Ruthenium dioxide

KW - Stability

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U2 - 10.1016/j.electacta.2020.135713

DO - 10.1016/j.electacta.2020.135713

M3 - Article

VL - 336

JO - Electrochimica Acta

JF - Electrochimica Acta

SN - 0013-4686

M1 - 135713

ER -