Low-loading Pt nanoparticles embedded on Ni, N-doped carbon as a superior electrocatalyst for oxygen reduction
As one of the efficient and classic nanoscale catalysts, Pt nanoparticles play the predominant roles in multiple energy conversion systems, especially for the electrochemical devices involving oxygen reduction reaction (ORR). It is important to develop a scalable synthetic method for more efficient Pt-based electrocatalysts with higher activity and stability. In this work, a low-loading Pt-based electrocatalyst (8.0 wt.%) is fabricated by the galvanic replacement, presenting well-dispersed Pt nanoparticles adjacent with atomic Ni–N–C complexes (Pt@NiNC). Due to the synergetic effect associated with the nanoscale/atomscale joint active sites and the strong metal-support interaction, the resulting Pt@NiNC hybrid exhibits the better ORR performance and a higher mass activity than the benchmark Pt/C, as well as the enhanced electrochemical stability. This research not only opens a new route to develop heterogeneous catalysts with multi-scale joint sites but also provides a bright prospect of high-performance and low-cost energy conversion and storage.