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The hollow frameworks were developed from sacrificial Ni nanoparticles via an in situ galvanic displacement effect with a Pt predecessor, straight following a preannealing process. By sampling the PtNi/C hollow nanoparticles at various reaction times, the architectural development procedure ended up being investigated using transmission electron microscopy with energy-dispersive X-ray spectroscopy mapping/line-scan profiling. We realized that the structure and morphology of the PtNi hollow nanoparticles h