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000911336 1001_ $$00000-0003-1966-9495$$aFeng, Quanchen$$b0$$eCorresponding author
000911336 245__ $$aLow‐Pt NiNC‐Supported PtNi Nanoalloy Oxygen Reduction Reaction Electrocatalysts—In Situ Tracking of the Atomic Alloying Process
000911336 260__ $$aWeinheim$$bWiley-VCH$$c2022
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000911336 520__ $$aWe report and analyze a synthetic strategy toward low-Pt platinum-nickel (Pt-Ni) alloy nanoparticle (NP) cathode catalysts for the catalytic electroreduction of molecular oxygen to water. The synthesis involves the pyrolysis and leaching of Ni-organic polymers, subsequent Pt NP deposition, followed by thermal alloying, resulting in single Ni atom site (NiNC)-supported PtNi alloy NPs at low Pt weight loadings of only 3–5 wt %. Despite low Pt weight loading, the catalysts exhibit more favorable Pt-mass activities compared to conventional 20–30 wt % benchmark PtNi catalysts. Using in situ microscopic techniques, we track and unravel the key stages of the PtNi alloy formation process directly at the atomic scale. Surprisingly, we find that carbon-encapsulated metallic Ni@C structures, rather than NiNx sites, act as the Ni source during alloy formation. Our materials concepts offer a pathway to further decrease the overall Pt content in hydrogen fuel cell cathodes.
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000911336 536__ $$0G:(GEPRIS)257727131$$aDFG project 257727131 - Nanoskalige Pt Legierungselektrokatalysatoren mit definierter Morphologie: Synthese, Electrochemische Analyse, und ex-situ/in-situ Transmissionselektronenmikroskopische (TEM) Studien (257727131)$$c257727131$$x1
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000911336 7001_ $$00000-0003-2785-9707$$aWang, Xingli$$b1
000911336 7001_ $$0P:(DE-HGF)0$$aKlingenhof, Malte$$b2
000911336 7001_ $$0P:(DE-Juel1)130695$$aHeggen, Marc$$b3
000911336 7001_ $$00000-0002-3884-436X$$aStrasser, Peter$$b4$$eCorresponding author
000911336 773__ $$0PERI:(DE-600)2011836-3$$a10.1002/anie.202203728$$gVol. 61, no. 36$$n36$$pe202203728$$tAngewandte Chemie / International edition$$v61$$x0570-0833$$y2022
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