@article{Wang2022, 
author = {Xiaoling Wang and Jingwei Li and Xiaotong Yang and Fengling Zhao and Yongfei Li and Daliang Zhang and Li-Yong Gan and Ke Xin Yao and Qiang Yuan},
title = {Low-coordinated surface sites make truncated Pd tetrahedrons as robust ORR electrocatalysts outperforming Pt for DMFC devices},
year = {2022},
journal = {Nano Research},
volume = {15},
number = {9},
pages = {7951-7958},
keywords = {oxygen reduction reaction, direct methanol fuel cells, Pd tetrahedrons, low-coordinated sites, lattice distortion},
url = {https://www.sciopen.com/article/10.1007/s12274-022-4492-2},
doi = {10.1007/s12274-022-4492-2},
abstract = {Developing highly stable and active non-Pt oxygen reduction reaction (ORR) electrocatalysts for power generation device raises great concerns and remains a challenge. Here, we report novel truncated Pd tetrahedrons (T-Pd-Ths) enclosed by {111} facets with excellent uniformity, which have both low-coordinated surface sites and distinct lattice distortions that would induce “local strain”. In alkaline electrolyte, the T-Pd-Ths/C achieves remarkable ORR specific/mass activity (SA/MA) of 2.46 mA·cm−2/1.69 A·mgPd−1, which is 12.3/16.9 and 10.7/14.1 times higher than commercial Pd/C and Pt/C, respectively. The T-Pd-Ths/C also exhibits high in-situ carbon monoxide (CO) tolerance and 50,000 cycles durability with an activity loss of 7.69% and morphological stability. The rotating ring-disk electrode (RRDE) measurements show that a 4-electron process occurs on T-Pd-Ths/C. Theoretical calculations demonstrate that the low-coordinated surface sites contribute largely to the enhancement of ORR activity. In actual direct methanol fuel cell (DMFC) device, the T-Pd-Ths/C delivers superior open-circuit voltage (OCV) and peak power density (PPD) to commercial Pt/C from 25 to 80 °C, and the maximum PPD can reach up to 163.7 mW·cm−2. This study demonstrates that the T-Pd-Ths/C holds promise as alternatives to Pt for ORR in DMFC device.}
}