1. Pd/NiSix: An efficient and stable acid-ORR electrocatalyst
- Author
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Liang, Chenjia, Xing, Shu-Ming, Zhao, Ruiyao, Hou, Xiaoxia, Chen, Teng, Zhao, Yingxuan, Liu, Rurong, Zhao, Siyuan, Wang, Xianghao, Guo, Xiangke, Xue, Nianhua, Peng, Luming, Zhao, Xiaomei, Pei, Yong, Li, Jian-Feng, and Ding, Weiping
- Abstract
An innovative strategy is proposed to enhance palladium (Pd) catalyst activity and stability performance in proton-exchange membrane fuel cells (PEMFCs). By utilizing a corrosion-resistant NiSix alloy as a support for Pd nanoparticles (NPs), the electronic states of active centers are effectively tuned. Pd/NiSixexhibits a significantly increased half-wave potential for the oxygen reduction reaction (ORR) at 0.857 V vs. reversible hydrogen electrode (RHE), with a 3.2-fold mass-specific activity and a 1.7-fold surface-specific activity compared to carbon-supported Pd. Notably, Pd/NiSixdemonstrates performance comparable to commercial platinum carbon, including a 12% increase in turnover frequency under PEMFC operating conditions. Density functional theory (DFT) calculations and in situRaman spectra confirm efficient oxygen adsorption and activation at the NiSix-Pd interface. This approach offers a promising avenue for developing advanced Pd-based electrocatalysts, as an alternative active center, for PEMFCs.
- Published
- 2024
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