Publications

Chemical Vapor Deposition of Hollow Graphitic Spheres for Improved Electrochemical Durability

Knossalla, J. and Mielby, J. and Göhl, D. and Wang, F.R. and Jalalpoor, D. and Hopf, A. and Mayrhofer, K.J.J. and Ledendecker, M. and Schüth, F.

ACS APPLIED ENERGY MATERIALS
Volume: 4 Pages: 5840-5847
DOI: 10.1021/acsaem.1c00643
Published: 2021

Abstract
The wet-chemical synthesis of hollow graphitic spheres, a highly defined model catalyst support for electrocatalytic processes, is laborious and not scalable, which hampers potential applications. Here, we present insights into the chemical vapor deposition (CVD) of ferrocene as a simple, scalable method to synthesize hollow graphitic spheres (HGScvd). During the CVD process, iron and carbon are embedded in the pores of a mesoporous silica template. In a subsequent annealing step, iron facilitates the synthesis of highly ordered graphite structures. We found that the applied temperature treatment allows for controlling of the degree of graphitization and the textural properties of HGScvd. Further, we demonstrate that platinum loaded on HGScvd is significantly more stable during electrochemical degradation protocols than catalysts based on commercial high surface area carbons. The established CVD process allows the scalable synthesis of highly defined HGS and therefore removes one obstacle for a broader application. © 2021 The Authors. Published by American Chemical Society.

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