PdPt-TiO2 nanowires: correlating composition, electronic effects and O-vacancies with activities towards water splitting and oxygen reduction

Anderson G.M. da Silva; Cibele G. Fernandes; Zachary D. Hood; Rui Peng; Zili Wu; André H.B. Dourado; Luanna S. Parreira; Daniela C. de Oliveira; Pedro H.C. Camargo; Susana I.Córdoba de Torresi

doi:10.1016/j.apcatb.2020.119177

PdPt-TiO₂ nanowires: correlating composition, electronic effects and O-vacancies with activities towards water splitting and oxygen reduction

Anderson G.M. da Silva, Cibele G. Fernandes, Zachary D. Hood, Rui Peng, Zili Wu, André H.B. Dourado, Luanna S. Parreira, Daniela C. de Oliveira, Pedro H.C. Camargo, Susana I.Córdoba de Torresi

Surface Chemistry & Catalysis Group

Research output: Contribution to journal › Article › peer-review

48 Scopus citations

Abstract

We report the optimization of both the support and the active phase of PdPt NPs supported on TiO₂ nanowires to obtain highly active electro/photocatalysts for the oxygen reduction and water splitting reactions. This system displayed strong metal-support interactions, high concentration of oxygen vacancies, and PdPt NP were ∼2 nm in size. By optimizing the loading of PdPt, both the photo- and electrocatalytic activities were improved compared to commercial materials. Interestingly, a volcano plot was obtained from the activity and the PdPt composition, and the Pd_0.22Pt_0.78-TiO₂/C sample afforded the optimal performance. For instance, the amount of hydrogen produced from water splitting was 11.6 mmol/g_catalyst. For the ORR, the activity was similar to a commercial Pt catalyst, but a lower E_onset (0.87 V_RHE vs w 0.95 V_RHE) was detected. The variations in the activities with the composition correlated well with the variations in the electronic effects and the concentration of oxygen vacancies.

Original language	English
Article number	119177
Journal	Applied Catalysis B: Environmental
Volume	277
DOIs	https://doi.org/10.1016/j.apcatb.2020.119177
State	Published - Nov 15 2020

Funding

This work was supported by the São Paulo Research Foundation (FAPESP) (grant number 2015/26308-7 ). S.I.C.T. and P.H.C.C. thank CNPq for their research fellowships. A.G.M.S., L. S.P. and A.H.B.D. thank FAPESP and CNPq for their fellowships (grant numbers FAPESP 2017/12407-9 and 2018/25567-7 ). We thank the Brazilian Synchrotron Light Laboratory (LNLS) for access to the XPS facility and the Laboratory of Structural Characterization (LCE/DEMa/UFSCar) for the general facilities. A portion of this research was conducted at the Center for Nanophase Materials Sciences, which is a DOE Office of Science User Facility. This work was supported by the S?o Paulo Research Foundation (FAPESP) (grant number 2015/26308-7). S.I.C.T. and P.H.C.C. thank CNPq for their research fellowships. A.G.M.S. L. S.P. and A.H.B.D. thank FAPESP and CNPq for their fellowships (grant numbers FAPESP 2017/12407-9 and 2018/25567-7). We thank the Brazilian Synchrotron Light Laboratory (LNLS) for access to the XPS facility and the Laboratory of Structural Characterization (LCE/DEMa/UFSCar) for the general facilities. A portion of this research was conducted at the Center for Nanophase Materials Sciences, which is a DOE Office of Science User Facility.

Keywords

Bimetallic NPs
ORR
TiO nanowires
Volcano plot
Water splitting

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10.1016/j.apcatb.2020.119177

Cite this

da Silva, A. G. M., Fernandes, C. G., Hood, Z. D., Peng, R., Wu, Z., Dourado, A. H. B., Parreira, L. S., de Oliveira, D. C., Camargo, P. H. C., & de Torresi, S. I. C. (2020). PdPt-TiO₂ nanowires: correlating composition, electronic effects and O-vacancies with activities towards water splitting and oxygen reduction. Applied Catalysis B: Environmental, 277, Article 119177. https://doi.org/10.1016/j.apcatb.2020.119177

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abstract = "We report the optimization of both the support and the active phase of PdPt NPs supported on TiO2 nanowires to obtain highly active electro/photocatalysts for the oxygen reduction and water splitting reactions. This system displayed strong metal-support interactions, high concentration of oxygen vacancies, and PdPt NP were ∼2 nm in size. By optimizing the loading of PdPt, both the photo- and electrocatalytic activities were improved compared to commercial materials. Interestingly, a volcano plot was obtained from the activity and the PdPt composition, and the Pd0.22Pt0.78-TiO2/C sample afforded the optimal performance. For instance, the amount of hydrogen produced from water splitting was 11.6 mmol/gcatalyst. For the ORR, the activity was similar to a commercial Pt catalyst, but a lower Eonset (0.87 VRHE vs w 0.95 VRHE) was detected. The variations in the activities with the composition correlated well with the variations in the electronic effects and the concentration of oxygen vacancies.",

keywords = "Bimetallic NPs, ORR, TiO nanowires, Volcano plot, Water splitting",

author = "{da Silva}, {Anderson G.M.} and Fernandes, {Cibele G.} and Hood, {Zachary D.} and Rui Peng and Zili Wu and Dourado, {Andr{\'e} H.B.} and Parreira, {Luanna S.} and {de Oliveira}, {Daniela C.} and Camargo, {Pedro H.C.} and {de Torresi}, {Susana I.C{\'o}rdoba}",

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da Silva, AGM, Fernandes, CG, Hood, ZD, Peng, R, Wu, Z, Dourado, AHB, Parreira, LS, de Oliveira, DC, Camargo, PHC & de Torresi, SIC 2020, 'PdPt-TiO₂ nanowires: correlating composition, electronic effects and O-vacancies with activities towards water splitting and oxygen reduction', Applied Catalysis B: Environmental, vol. 277, 119177. https://doi.org/10.1016/j.apcatb.2020.119177

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AU - Peng, Rui

AU - Wu, Zili

AU - Dourado, André H.B.

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AU - Camargo, Pedro H.C.

AU - de Torresi, Susana I.Córdoba

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AB - We report the optimization of both the support and the active phase of PdPt NPs supported on TiO2 nanowires to obtain highly active electro/photocatalysts for the oxygen reduction and water splitting reactions. This system displayed strong metal-support interactions, high concentration of oxygen vacancies, and PdPt NP were ∼2 nm in size. By optimizing the loading of PdPt, both the photo- and electrocatalytic activities were improved compared to commercial materials. Interestingly, a volcano plot was obtained from the activity and the PdPt composition, and the Pd0.22Pt0.78-TiO2/C sample afforded the optimal performance. For instance, the amount of hydrogen produced from water splitting was 11.6 mmol/gcatalyst. For the ORR, the activity was similar to a commercial Pt catalyst, but a lower Eonset (0.87 VRHE vs w 0.95 VRHE) was detected. The variations in the activities with the composition correlated well with the variations in the electronic effects and the concentration of oxygen vacancies.

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