@article{He2024, 
author = {Yuwei He and Yueguang Chen and Renjie Wu and Zhihe Xiao and Mengxian Li and Chunfeng Shi and Leyu Wang},
title = {Ligand effect in surface atomic sites of group VI B transition metals on ultrathin Pt nanowires for enhanced oxygen reduction},
year = {2024},
journal = {Nano Research},
volume = {17},
number = {6},
pages = {5298-5304},
keywords = {oxygen reduction reaction, ultrathin nanowires, ligand effect, group VI B transition metal, multiple oxygen species},
url = {https://www.sciopen.com/article/10.1007/s12274-024-6528-2},
doi = {10.1007/s12274-024-6528-2},
abstract = {Increasing the utilization efficiency of platinum is critical for advancing proton exchange-membrane fuel cells (PEMFCs). Despite extensive research on catalysts for the cathodic oxygen reduction reaction (ORR), developing highly active and durable Pt-based catalysts that can suppress surface dealloying in corrosive acid conditions remains challenging. Herein, we report a facile synthesis of bimetallic ultrathin PtM (M = Mo, W, and Cr) nanowires (NWs) composed of group VI B transition metal atomic sites anchored on the surface. These NWs possess uniform sizes and well-controlled atomic arrangements. Compared to PtW and PtCr catalysts, the PtMo0.05 NWs exhibit the highest half-wave potential of 0.935 V and a mass activity of 1.43 A·mgPt−1. Remarkably, they demonstrate a remarkable 23.8-fold enhancement in mass activity compared to commercial Pt/C for ORR, surpassing previously reported Pt-based catalysts. Additionally, the PtMo NWs cathode in membrane electrode assembly tests achieves a remarkable peak power density of 1.443 W·cm−2 (H2-O2 conditions at 80 °C), which is 1.09 times that of commercial Pt/C. The ligand effect in the bimetallic surface not only facilitates strong coupling between Mo (4d) and Pt (5d) atomic orbitals to hinder atom leaching but also modulates the d-states of active site, significantly optimizing the adsorption of key oxygen (*O and *OH) species and accelerating the rate-determining step in ORR pathways.}
}