PdNi Trimer Sites Drive Efficient and Durable Hydrogen Oxidation in Alkaline Media.

J Am Chem Soc

Beijing National Laboratory for Molecular Sciences (BNLMS), Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China.

Published: January 2025

Anion-exchange membrane fuel cell (AEMFC) is a cost-effective hydrogen-to-electricity conversion technology under a zero-emission scenario. However, the sluggish kinetics of the anodic hydrogen oxidation reaction (HOR) impedes the commercial implementation of AEMFCs. Here, we develop a Pd single-atom-embedded NiN catalyst (Pd/NiN) with unconventional PdNi trimer sites to drive efficient and durable HOR in alkaline media. Integrating theoretical and experimental analyses, we demonstrate that dual PdNi sites achieve a "*H on PdNi-H + *OH on PdNi-H" adsorption mode, effectively weakening the overstrong *H and *OH adsorptions on pristine NiN. Owing to the unique coordination mode and atomically dispersed catalytic sites, the resulting Pd/NiN catalyst delivers a high intrinsic and mass activity together with excellent antioxidation capability and CO tolerance. Specifically, the HOR mass activity of Pd/NiN reaches 7.54 A mg at the overpotential of 50 mV. The AEMFC employing Pd/NiN as the anode catalyst displays a high power density of 31.7 W mg with an ultralow anode precious metal loading of only 0.023 mg cm. This study provides guidance for the design of high-performance alkaline HOR catalytic sites at the atomic level.

Download full-text PDF

Source
http://dx.doi.org/10.1021/jacs.4c17605DOI Listing

Publication Analysis

Top Keywords

pdni trimer
8
trimer sites
8
sites drive
8
drive efficient
8
efficient durable
8
hydrogen oxidation
8
alkaline media
8
catalytic sites
8
mass activity
8
sites
5

Similar Publications

Want AI Summaries of new PubMed Abstracts delivered to your In-box?

Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!