Tailoring electrochemical efficiency of hydrogen evolution by fine tuning of TiO x /RuO x composite cathode architecture
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Tailoring electrochemical efficiency of hydrogen evolution by fine tuning of TiO x /RuO x composite cathode architecture. / Fedorov, Fedor S.; Vasilkov, Mikhail Y.; Panov, Maxim; Rupasov, Dmitry; Rashkovskiy, Alexander; Ushakov, Nikolay M.; Lee, Jaeho; Hempelmann, Rolf; Kallio, Tanja; Nasibulin, Albert G.
In: International Journal of Hydrogen Energy, Vol. 44, No. 21, 23.04.2019, p. 10593-10603.Research output: Contribution to journal › Article › Scientific › peer-review
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T1 - Tailoring electrochemical efficiency of hydrogen evolution by fine tuning of TiO x /RuO x composite cathode architecture
AU - Fedorov, Fedor S.
AU - Vasilkov, Mikhail Y.
AU - Panov, Maxim
AU - Rupasov, Dmitry
AU - Rashkovskiy, Alexander
AU - Ushakov, Nikolay M.
AU - Lee, Jaeho
AU - Hempelmann, Rolf
AU - Kallio, Tanja
AU - Nasibulin, Albert G.
PY - 2019/4/23
Y1 - 2019/4/23
N2 - Here we report an approach to design composite cathode based on TiO x nanotubes decorated with RuO x nanowhiskers for efficient hydrogen evolution. We tailor catalytic activity of the cathodes by adjustment of morphology of TiO x nanotubular support layer along with variation of RuO x loaded mass and assess its performance using electrochemical methods and wavelet analysis. The highest energy efficiency of hydrogen evolution is observed in 1 M H 2 SO 4 electrolyte to be ca. 64% at −10 mA/cm 2 for cathodes of the most developed area, i.e. smaller diameter of tubes, with enhanced RuO x loading. The efficiency is favored by detachment of small hydrogen bubbles what is revealed by wavelet analysis and is expressed in pure noise at wavelet spectrum. At increased current density, −50 or −100 mA/cm 2 , better efficiency of composite cathodes is supported by titania nanotubes of larger diameter due to an easier release of large hydrogen bubbles manifested in less periodic events appeared in the frequency region of 5–12 s at the spectra. We have shown that efficiency of the catalysts is determined by a pre-dominant type of hydrogen bubble release at different operation regimes depending on specific surface and a loaded mass of ruthenia.
AB - Here we report an approach to design composite cathode based on TiO x nanotubes decorated with RuO x nanowhiskers for efficient hydrogen evolution. We tailor catalytic activity of the cathodes by adjustment of morphology of TiO x nanotubular support layer along with variation of RuO x loaded mass and assess its performance using electrochemical methods and wavelet analysis. The highest energy efficiency of hydrogen evolution is observed in 1 M H 2 SO 4 electrolyte to be ca. 64% at −10 mA/cm 2 for cathodes of the most developed area, i.e. smaller diameter of tubes, with enhanced RuO x loading. The efficiency is favored by detachment of small hydrogen bubbles what is revealed by wavelet analysis and is expressed in pure noise at wavelet spectrum. At increased current density, −50 or −100 mA/cm 2 , better efficiency of composite cathodes is supported by titania nanotubes of larger diameter due to an easier release of large hydrogen bubbles manifested in less periodic events appeared in the frequency region of 5–12 s at the spectra. We have shown that efficiency of the catalysts is determined by a pre-dominant type of hydrogen bubble release at different operation regimes depending on specific surface and a loaded mass of ruthenia.
KW - Composite cathode
KW - Hydrogen evolution reaction
KW - Ruthenia
KW - Titania nanotubes
KW - Water electrolysis
KW - Wavelet analysis
UR - http://www.scopus.com/inward/record.url?scp=85063411503&partnerID=8YFLogxK
U2 - 10.1016/j.ijhydene.2019.03.019
DO - 10.1016/j.ijhydene.2019.03.019
M3 - Article
VL - 44
SP - 10593
EP - 10603
JO - International Journal of Hydrogen Energy
JF - International Journal of Hydrogen Energy
SN - 0360-3199
IS - 21
ER -
ID: 32931151