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Updated: Aug 6, 2026

Tuning the Acidity of Pt/ CNTs Catalysts for Hydrodeoxygenation of Diphenyl Ether
Published on: August 17, 2019
Unconventional-Phase Pd20Te7 Octahedra With High-Index Facets for Oxygen Reduction
Pinlin Wang1, Qing Gong1, Fei Xue1
1State Key Laboratory of Physical Chemistry of Solid Surfaces, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen, China.
Abstract:
The high surface energy leads to a significant challenge in the chemical synthesis of high-index faceted nanomaterials. While the preparation of unconventional-phase palladium (Pd)-based nanocrystals with high-index facets is largely unexplored. Herein, we introduce ethylene glycol as the morphology and size controller for unconventional-phase Pd20Te7 nano-octahedra (NOs) enclosed by {300}, {2 0}, and {2 3} high-index facets. These facets endow Pd20Te7 NOs with excellent electrocatalytic activity for alkaline oxygen reduction reaction. Their high mass activity of 1.91 A mgPd -1 at 0.90 V (vs. RHE) demonstrates a 1.89-fold enhancement relative to Pd20Te7 nanoparticles (NPs). More importantly, the Pd20Te7 NOs-based membrane electrode assembly (MEA) achieves a peak power density of 0.59 W cm-2 and a mass activity of 14.33 A mgPGM -1 (PGM: platinum group metals), measured in H2-O2 fuel cells at an internal resistance-corrected voltage of 0.65 V, corresponding to a 1.22-fold and 2.47-fold enhancement compared to Pd20Te7 NPs (0.49 W cm-2 and 5.81 A mgPGM -1). Furthermore, the Pd20Te7 NOs-based MEA demonstrates stable operation at 0.4 A cm-2 for nearly 1440 min under an ultralow Pd loading of 0.022 mg cm-2 on the cathode. This work offers a new avenue to rationally design and construct high-index faceted nanocrystals for high-efficiency catalytic applications.
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