Journal
MATTER
Volume 5, Issue 9, Pages 2946-2959Publisher
CELL PRESS
DOI: 10.1016/j.matt.2022.06.008
Keywords
-
Categories
Funding
- Na- tional Key Research and Development Program of China [2019YFB1504503]
- NSFC of China [21878030, 21761162015]
Ask authors/readers for more resources
By using a sequential hydrogen-adsorption-assisted bond-weakening strategy, highly active sub-2 nm Pt-based alloy nanocrystals for oxygen reduction reaction (ORR) can be synthesized, leading to a significant improvement in the efficiency of the reaction.
Synthesis of highly active sub-2 nm Pt-based alloy nanocrystals for oxygen reduction reaction (ORR), especially by a confinement-free route, remains a challenge. Herein, we report a sequential hydrogen-adsorption-assisted bond-weakening strategy. To Pt-3 clusters deposited on Fe-N-5-C surface, due to stronger Pt-H than N-H interaction, H would firstly adsorb on Pt and then on N, which then weakens Pt-Pt and Fe-N bonds, improves atomic mobility, and thus significantly decreases the kinetic barriers for alloying Pt clusters with single Fe species, As a result, Pt alloys can be prepared at a lower temperature, which largely inhibits the size growth and successfully leads to 1.55 nm Pt3Fe and 1.25 nm Pt3Ni intermetallic nanocrystals. Under an ultralow cathodic loading of 0.03 mg(Pt) cm(-2), the H-2-O-2 fuel cell assembled with Pt3Ni cathode delivers extraordinary activity (1.60 A cm(-2)@0.67 V; 13.7 W mg(Pt)(-1) for the whole cell).
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available