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

被引：46

作者：

da Silva, Anderson G. M. ^{[1
,2
]}

Fernandes, Cibele G. ^{[2
]}

Hood, Zachary D. ^{[3
,4
]}

Peng, Rui ^{[3
]}

Wu, Zili ^{[3
]}

Dourado, Andre H. B. ^{[2
]}

Parreira, Luanna S. ^{[2
]}

de Oliveira, Daniela C. ^{[5
]}

Camargo, Pedro H. C. ^{[6
]}

Cordoba de Torresi, Susana, I ^{[2
]}

机构：

[1] Pontificia Univ Catolica Rio de Janeiro PUC Rio, Dept Engn Quim & Mat DEQM, Rua Marques Sao Vicente,225 Gavea, BR-22453900 Rio De Janeiro, RJ, Brazil

[2] Univ Sao Paulo, Dept Quim Fundamental, Inst Quim, Av Prof Lineu Prestes 748, BR-05508000 Sao Paulo, SP, Brazil

[3] Oak Ridge Natl Lab, Ctr Nanophase Mat Sci, Oak Ridge, TN 37831 USA

[4] Georgia Inst Technol, Sch Chem & Biochem, Atlanta, GA 30332 USA

[5] Ctr Nacl Pesquisa Energia & Mat, Lab Nacl Luz Sincrotron, BR-13083970 Campinas, SP, Brazil

[6] Univ Helsinki, Dept Chem, AI Virtasen Aukio 1, Helsinki 00014, Finland

来源：

APPLIED CATALYSIS B-ENVIRONMENTAL | 2020年 / 277卷

基金：

巴西圣保罗研究基金会;

关键词：

Bimetallic NPs; TiO2; nanowires; Water splitting; ORR; Volcano plot; HYDROGEN-PRODUCTION; CATALYTIC-ACTIVITY; TIO2; MATERIALS; REACTION ORR; PD; EVOLUTION; OXIDATION; TI3+; ELECTROCATALYSTS; NANOPARTICLES;

D O I：

10.1016/j.apcatb.2020.119177

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

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 similar to 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 Pd0.22P0.78-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.

引用

页数：10

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