Chen Shouping, Li Mufan, Gao Mengyu, Jin Jianbo, van Spronsen Matthijs A, Salmeron Miquel B, Yang Peidong
Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States.
Kavli Energy NanoScience Institute, Berkeley, California 94720, United States.
Nano Lett. 2020 Mar 11;20(3):1974-1979. doi: 10.1021/acs.nanolett.9b05251. Epub 2020 Feb 18.
Pt-based alloy catalysts are promising candidates for fuel-cell applications, especially for cathodic oxygen reduction reaction (ORR) and anodic methanol oxidation reaction (MOR). The rational design of composition and morphology is crucial to promoting catalytic performances. Here, we report the synthesis of Pt-Co nanoframes via chemical etching of Co from solid rhombic dodecahedra. The obtained Pt-Co nanoframes exhibit excellent ORR mass activity in acidic electrolyte, which is as high as 0.40 A mg initially and 0.34 A mg after 10 000 potential cycles at 0.95 V. Furthermore, their MOR mass activity in alkaline media is up to 4.28 A mg and is 4-fold higher than that of commercial Pt/C catalyst. Experimental studies indicate that the weakened binding of intermediate carbonaceous poison contributes to the enhanced MOR behavior. More impressively, the Pt-Co nanoframes also demonstrate remarkable stability under long-term testing, which could be attributed to the negligible electrochemical Co dissolution.
基于铂的合金催化剂是燃料电池应用中很有前景的候选材料，特别是用于阴极氧还原反应（ORR）和阳极甲醇氧化反应（MOR）。合理设计组成和形态对于提高催化性能至关重要。在此，我们报道了通过从实心菱形十二面体中化学蚀刻钴来合成铂-钴纳米框架。所获得的铂-钴纳米框架在酸性电解质中表现出优异的ORR质量活性，最初高达0.40 A mg，在0.95 V下进行10000次电位循环后为0.34 A mg。此外，它们在碱性介质中的MOR质量活性高达4.28 A mg，比商业铂/碳催化剂高4倍。实验研究表明，中间含碳毒物的结合减弱有助于增强MOR行为。更令人印象深刻的是，铂-钴纳米框架在长期测试中也表现出显著的稳定性，这可归因于可忽略不计的电化学钴溶解。
