Bifunctional Pt-Ni Electrocatalyst Synthesis with Ultralow Platinum Seeds for Oxygen Evolution and Reduction in Alkaline Medium

Melina Zysler, Victor Shokhen, Samuel Spencer Hardisty, Anya Muzikansky, David Zitoun

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7 Scopus citations

Abstract

Pt-Ni polyhedral nanoparticles (NPs) are extensively studied as electrocatalysts, mainly for oxygen reduction reaction (ORR), but they display a poor activity for the oxygen evolution reaction (OER). Here, ultralow platinum Pt@Ni@Pt core-bishell nanorods were designed (less than 1 wt % of Pt), synthesized, and characterized to yield bifunctional electrocatalysts with high efficiency toward ORR and OER in alkaline media. Ultralow platinum Pt@Ni@Pt core-bishell nanorods achieve an unprecedented (for a Pt-based catalyst) overpotential of 0.29 V at 10 mA cm-2and current density of 162 mA μg-1Ptat 1.6 V (vs RHE) for the OER, while still maintaining a very decent value of 0.32 A mg-1Ptat 0.85 V for the ORR. These values outperform the standard Pt catalyst for the ORR and the Ni catalyst for the OER, using less than 1 wt % Pt. We describe the two-step synthesis of the Pt@Ni@Pt nanorods, demonstrating the adjustment of their structural properties by a combination of dimethylformamide (DMF) and benzyl alcohol in a solvothermal reaction. We found that the solvent ratio controls the Pt-core size, Ni-shell thickness, and morphology. The combination of high performance and structure control via synthesis makes Pt@Ni@Pt nanorods promising candidates for further applications and opens a door for their further investigation.

Original languageEnglish
Pages (from-to)4212-4220
Number of pages9
JournalACS Applied Energy Materials
Volume5
Issue number4
DOIs
StatePublished - 25 Apr 2022

Bibliographical note

Publisher Copyright:
© 2022 American Chemical Society. All rights reserved.

Funding

D.Z. thanks Prof. Marian Chatenet for the fruitful discussion and knowledge on AST. This work was partially supported by the Planning & Budgeting Committee of the Council for Higher Education and the Prime Minister Office of Israel, in the framework of the INREP project. M.Z. acknowledges funding from the Israeli Ministry of Absorption. V.S. acknowledges support from the Embassy of France in Israel through the Chateaubriand fellowship. S.H. acknowledges funding from the European Union’s Horizon 2020 research and innovation program under the Marie Skłodowska-Curie Grant Agreement no. 765289, under a project entitled FLOWCAMP.

FundersFunder number
Embassy of France in Israel
Marie Skłodowska-Curie765289
Prime Minister office of Israel
Horizon 2020 Framework Programme
Ministry of Aliyah and Immigrant Absorption
Council for Higher Education

    Keywords

    • Pt-Ni nanoparticle
    • alkaline medium
    • core-shell
    • electrocatalysts
    • oxygen evolution reaction
    • oxygen reduction reaction

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