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

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

doi:10.1016/j.apcatb.2020.119177

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

Journal Article · Fri May 29 00:00:00 EDT 2020 · Applied Catalysis B: Environmental

DOI:https://doi.org/10.1016/j.apcatb.2020.119177· OSTI ID:1787019

da Silva, Anderson G.M. ^[1]; Fernandes, Cibele G. ^[2]; Hood, Zachary D. ^[3];

^[4];

^[4]; Dourado, André H.B. ^[2]; Parreira, Luanna S. ^[2]; de Oliveira, Daniela C. ^[5]; Camargo, Pedro H.C. ^[6]; de Torresi, Susana Córdoba ^[2]

Pontifícia Universidade Católica do Rio de Janeiro (PUC-Rio) (Brazil); Univ. of Sao Paulo (Brazil)
Univ. of Sao Paulo (Brazil)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Center for Nanophase Materials Sciences (CNMS); Georgia Inst. of Technology, Atlanta, GA (United States)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Center for Nanophase Materials Sciences (CNMS)
Laboratório Nacional de Luz Síncrotron, Sao Paulo (Brazil). Centro Nacional de Pesquisa em Energia e Materiais
Univ. of Helsinki (Finland)

Here 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.

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Research Organization:: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES); São Paulo Research Foundation (FAPESP)

Grant/Contract Number:: AC05-00OR22725; 2015/26308-7; 2017/12407-9; 2018/25567-7

OSTI ID:: 1787019

Alternate ID(s):: OSTI ID: 1819533

Journal Information:: Applied Catalysis B: Environmental, Vol. 277; ISSN 0926-3373

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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

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