TY - JOUR
T1 - The effect of ruthenium content on the stability and activity of Ti/RuO2-Sb2O5-SnO2 for oxygen evolution
AU - Li, Jiaying
AU - Qin, Xusong
AU - Chen, Guanghao
AU - Chen, Guohua
N1 - Funding Information:
The authors gratefully acknowledge the financial support provided by Hong Kong Innovation and Technology Commission (Project No. ITC-CNERC14EG03), and partially by Hong Kong Research Grant Council (Project No. T21-604/19-R).
Publisher Copyright:
© 2021 Taiwan Institute of Chemical Engineers
PY - 2021/8
Y1 - 2021/8
N2 - The effects of ruthenium content on Ti/RuO2-Sb2O5-SnO2 anodes are investigated in terms of catalytic activity and stability for oxygen evolution. The best electrochemical stability appears at nominal Ru content around 30%, giving average accelerated lives of 419 and 165 h at 25 and 70 °C, respectively, under the current density of 500 mA cm−2 in 3 M H2SO4 solution. These values are respectively ~8 and >22 times longer than any types of RuO2-based electrodes reported previously. The electrocatalytic activity of Ti/RuO2-Sb2O5-SnO2 anodes is found to increase with nominal Ru content approaching 75%. The physicochemical and electrochemical analyses reveal that the homogeneous intermixture of RuO2, SnO2 and Sb2O5 with a smooth and compact surface decreases the dissolution rate of RuO2, leading to a significant improvement on the electrode service life. Despite the numerous pores and cracks found in the coating, Ti/RuO2-Sb2O5-SnO2 anode with a nominal Ru content of 75% exhibits better electrocatalytic performance for O2 evolution, which is attributed to more active RuO2 sites exposed to electrolyte. Therefore, the existence of the optimal Ru content for Ti/RuO2-Sb2O5-SnO2 is the balanced effect between electrochemical stability and activity for O2 evolution, as well as cost for specific applications.
AB - The effects of ruthenium content on Ti/RuO2-Sb2O5-SnO2 anodes are investigated in terms of catalytic activity and stability for oxygen evolution. The best electrochemical stability appears at nominal Ru content around 30%, giving average accelerated lives of 419 and 165 h at 25 and 70 °C, respectively, under the current density of 500 mA cm−2 in 3 M H2SO4 solution. These values are respectively ~8 and >22 times longer than any types of RuO2-based electrodes reported previously. The electrocatalytic activity of Ti/RuO2-Sb2O5-SnO2 anodes is found to increase with nominal Ru content approaching 75%. The physicochemical and electrochemical analyses reveal that the homogeneous intermixture of RuO2, SnO2 and Sb2O5 with a smooth and compact surface decreases the dissolution rate of RuO2, leading to a significant improvement on the electrode service life. Despite the numerous pores and cracks found in the coating, Ti/RuO2-Sb2O5-SnO2 anode with a nominal Ru content of 75% exhibits better electrocatalytic performance for O2 evolution, which is attributed to more active RuO2 sites exposed to electrolyte. Therefore, the existence of the optimal Ru content for Ti/RuO2-Sb2O5-SnO2 is the balanced effect between electrochemical stability and activity for O2 evolution, as well as cost for specific applications.
KW - DSA
KW - Electrochemical stability
KW - Metal oxide coating
KW - O evolution
KW - Ru-based electro-catalyst
UR - http://www.scopus.com/inward/record.url?scp=85108947353&partnerID=8YFLogxK
U2 - 10.1016/j.jtice.2021.06.020
DO - 10.1016/j.jtice.2021.06.020
M3 - Journal article
AN - SCOPUS:85108947353
SN - 1876-1070
VL - 125
SP - 186
EP - 194
JO - Journal of the Taiwan Institute of Chemical Engineers
JF - Journal of the Taiwan Institute of Chemical Engineers
ER -