Pt alloy nanoparticles decorated on large-size nitrogen-doped graphene tubes for highly stable oxygen-reduction catalysts

Chen, Mengjie; Hwang, Sooyeon; Li, Jiazhan; Karakalos, Stavros; Chen, Kate; He, Yanghua; Mukherjee, Shreya; Su, Dong; Wu, Gang

doi:10.1039/C8NR05888A

Title: Pt alloy nanoparticles decorated on large-size nitrogen-doped graphene tubes for highly stable oxygen-reduction catalysts

Journal Article · Mon Sep 03 00:00:00 EDT 2018 · Nanoscale

DOI:https://doi.org/10.1039/C8NR05888A· OSTI ID:1476277

Chen, Mengjie ^[1]; Hwang, Sooyeon ^[2]; Li, Jiazhan ^[1];

^[3]; Chen, Kate ^[1];

^[1]; Mukherjee, Shreya ^[1];

^[2];

^[1]

Univ. at Buffalo, NY (United States). Dept. of Chemical and Biological Engineering
Brookhaven National Lab. (BNL), Upton, NY (United States). Center for Functional Nanomaterials
Univ. of South Carolina, Columbia, SC (United States). Dept. of Chemical Engineering

Pt alloy nanoparticles supported on Vulcan XC-72 (Pt/C) are the most effective catalysts for kinetically sluggish oxygen reduction reaction (ORR) in proton exchange membrane fuel cells. However, significant performance degradation has been observed with the Pt/C catalysts due to agglomeration and Ostwald ripening of Pt nanoparticles largely resulting from the corrosion of carbon supports. In this paper, we developed a Pt alloy catalyst through annealing Pt nanoparticles deposited on nitrogen/metal co-doped large-size graphene tubes (NGTs). The in-situ formation of PtM (M: Co and Ni) alloy during the annealing process contributes to the improvement of the catalytic activity and stability. During the accelerated stress tests (AST), after 20 000 potential cycles (0.6–1.0 V vs. RHE), the retained electrochemical surface area (ECSA) of the PtM/NGT catalyst is more than 2 times larger than that of the Pt/C catalyst. As for the AST tests of carbon corrosion, after 30 000 potential cycles (1.0–1.5 V vs. RHE) at room temperature, the NGT morphologies are well maintained and no ECSA loss of this PtM catalyst is observed, indicating excellent corrosion-resistance. Even at harsher 60 °C, the PtM/NGT catalyst exhibits only insignificant loss (6 mV) of E_1/2 while the Pt/C catalyst shows significant degradation (47 mV loss in E_1/2). Finally, the improved stability of PtM/NGT catalyst is attributed to the highly graphitized NGTs and possible synergistic effects between the NGT carbon support and the PtM alloy nanoparticles.

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Research Organization:: Brookhaven National Lab. (BNL), Upton, NY (United States); Univ. at Buffalo, NY (United States)

Sponsoring Organization:: USDOE Office of Energy Efficiency and Renewable Energy (EERE), Sustainable Transportation Office. Hydrogen Fuel Cell Technologies Office; USDOE Office of Science (SC)

Grant/Contract Number:: SC0012704

OSTI ID:: 1476277

Alternate ID(s):: OSTI ID: 1469234

Report Number(s):: BNL-209135-2018-JAAM

Journal Information:: Nanoscale, Vol. 10, Issue 36; ISSN 2040-3364

Publisher:: Royal Society of ChemistryCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 37 works

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