Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 10, Issue 22, Pages 18734-18745Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.8b04060
Keywords
nitrogen-doped graphene; core-shell; fct-PdFe@Pd@NG; oxygen reduction reaction; fuel cells
Funding
- Basic Research Program through the National Research Foundation (NRF) - Ministry of Science and ICT of Republic of Korea [2017R1A2B3004917]
- Nano-Material Technology Development Program through the National Research Foundation (NRF) - Ministry of Science and ICT of Republic of Korea [2016M3A7B4900117]
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Development of highly active and durable catalysts for oxygen reduction reaction (ORR) alternative to Pt-based catalyst is an essential topic of interest in the research community but a challenging task. Here, we have developed a new type of face-centered tetragonal (fct) PdFe-alloy nanoparticle-encapsulated Pd (fct-PdFe@Pd) anchored onto nitrogen-doped graphene (NG). This core-shell fct-PdFe@Pd@ NG hybrid is fabricated by a facile and cost-effective technique. The effect of temperature on the transformation of face- centered cubic (fcc) to fct structure and their effect on ORR activity are systematically investigated. The core-shell fct-PdFe@Pd@NG hybrid exerts high synergistic interaction between fctPdFe@Pd NPs and NG shell, beneficial to enhance the catalytic ORR activity and excellent durability. Impressively, core-shell fct-PdFe@Pd@NG hybrid exhibits an excellent catalytic activity for ORR with an onset potential of , similar to 0.97 V and a half-wave potential of similar to 0.83 V versus relative hydrogen electrode, ultrahigh current density, and decent durability after 10 000 potential cycles, which is significantly higher than that of marketable Pt/C catalyst. Furthermore, the core-shell fct-PdFe@Pd@NG hybrid also shows excellent tolerance to methanol, unlike the commercial Pt/C catalyst. Thus, these findings open a new protocol for fabricating another core-shell hybrid by facile and cost-effective techniques, emphasizing great prospect in next-generation energy conversion and storage applications.
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