TY - JOUR
T1 - Electrochemical and photoelectrochemical oxygen evolution reactions by Group X hetero-metal oxides
AU - Balamurugan, Chandran
AU - Jo, Hyeonjeong
AU - Yoo, Dongwan
AU - Cho, Jaewhan
AU - Nam, Ki Min
AU - Seo, Junhyeok
N1 - Publisher Copyright:
© 2020 Elsevier B.V.
PY - 2021/3/1
Y1 - 2021/3/1
N2 - Electrochemical and photoelectrochemical water splitting methods must be developed to establish a sustainable energy system. In this study, we prepared Group X hetero-metal oxides and studied their (photo)electrochemical properties. Their electrochemical oxygen evolution activities improved as follows: PtO ≪ Ni/NiO < PdO + Ni/NiO < PtOx + Ni/NiO. During deposition of the nanoparticles on a nanorod-shaped TiO2 surface, we observed interesting chemical and photoelectrochemical reactivities varied by the hetero-metal oxides nanoparticles. The Group X hetero-metal oxides on the TiO2 photoanode systematically enhanced catalytic activities for the photoelectrochemical oxygen evolution reaction, while decreasing the surface charge recombination and modulating the TiO2 band gap. The Pt/PtOx + Ni/NiO hetero-metal oxides acted as the most efficient cocatalyst on the TiO2 surface with a photocurrent of 2.62 mA/cm2 at 1.23 V vs. RHE and 70% IPCE value, which is ~4 times higher than a pristine TiO2.
AB - Electrochemical and photoelectrochemical water splitting methods must be developed to establish a sustainable energy system. In this study, we prepared Group X hetero-metal oxides and studied their (photo)electrochemical properties. Their electrochemical oxygen evolution activities improved as follows: PtO ≪ Ni/NiO < PdO + Ni/NiO < PtOx + Ni/NiO. During deposition of the nanoparticles on a nanorod-shaped TiO2 surface, we observed interesting chemical and photoelectrochemical reactivities varied by the hetero-metal oxides nanoparticles. The Group X hetero-metal oxides on the TiO2 photoanode systematically enhanced catalytic activities for the photoelectrochemical oxygen evolution reaction, while decreasing the surface charge recombination and modulating the TiO2 band gap. The Pt/PtOx + Ni/NiO hetero-metal oxides acted as the most efficient cocatalyst on the TiO2 surface with a photocurrent of 2.62 mA/cm2 at 1.23 V vs. RHE and 70% IPCE value, which is ~4 times higher than a pristine TiO2.
KW - Facet-selective deposition
KW - Group X hetero-metal oxides
KW - nanorod TiO
KW - Photoelectrochemical oxygen evolution
UR - http://www.scopus.com/inward/record.url?scp=85096912716&partnerID=8YFLogxK
U2 - 10.1016/j.apsusc.2020.148523
DO - 10.1016/j.apsusc.2020.148523
M3 - Article
AN - SCOPUS:85096912716
SN - 0169-4332
VL - 541
JO - Applied Surface Science
JF - Applied Surface Science
M1 - 148523
ER -