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Three-dimensional palladium-rhodium nanosheet assemblies: Highly efficient catalysts for methanol electrooxidation
- Shang, Hongyuan, Xu, Hui, Jin, Liujun, Chen, Chunyan, Wang, Cheng, Song, Tongxin, Du, Yukou
- Journal of colloid and interface science 2019 v.556 pp. 360-365
- catalysts, catalytic activity, electrochemistry, fuel cells, methanol, nanosheets, oxidation, palladium
- Even though substantial attention has been focused on exploring promising palladium-based catalysts, the creation of electrocatalysts with simultaneous high activity and reduced cost for fuel cell reactions remains a challenge. Here, we report on the design and construction of a new class of three-dimensional (3D) palladium-rhodium (PdRh) nanosheet assembly (NSA) catalysts through a seed-mediated growth method. Interestingly, the well-defined NSAs with optimized electronic structures and highly open 3D structures exhibit greatly enhanced electrocatalytic activity toward the methanol oxidation reaction (MOR). In particular, optimized Pd86Rh14 NSAs have a mass activity of 1672.7 mA mg−1 for the MOR, 5.4 times higher than that of commercial Pd/C catalysts (303.8 mA mg−1). More importantly, these PdRh NSAs also display improved MOR stability, with stable high electrocatalytic performance for more than 250 potential cycles.