College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou 215123, PR China.
Nanoscale. 2018 Jul 9;10(26):12605-12611. doi: 10.1039/c8nr03386b.
The rational design and engineering of bimetallic Pd-based nanocatalysts with both high activity and durability are of paramount significance for the practical applications of fuel cells. Herein, a new class of well-defined 2D NiZn oxyphosphide nanosheets (NiZnP NSs) have been successfully engineered to support unique 3D PdRu nanoflowers (PdRu NFs) via a facile strategy. Such nanohybrids with abundant surface active areas and modified electronic structure exhibit a great enhancement in electrocatalytic activity for the methanol oxidation reaction (MOR) and ethanol oxidation reaction (EOR), whose mass/specific activities are 1739.5 mA mg-1/4.5 mA cm-2 and 4719.8 mA mg-1/12.3 mA cm-2, which are 8.3/9.0 and 8.3/9.5 times higher than those of commercial Pd/C catalysts, respectively. More interestingly, with the remarkable promotional effect of NiZnP NSs, such 3D-2D PdRu/NiZn oxyphosphide nanohybrids can even retain 72.4% and 70.1% of initial catalytic activity toward MOR and EOR for 1000 potential cycles with negligible morphological or compositional variations. The successful construction of this new class of electrocatalysts opens up a new way for designing 3D-2D nanohybrids with high performance for electrochemical reactions and beyond.
双金属 Pd 基纳米催化剂具有高活性和耐久性，其合理设计和工程化对于燃料电池的实际应用至关重要。在此，通过一种简便的策略，成功地设计了一类新型的二维 NiZn 磷氧化物纳米片（NiZnP NSs）来负载独特的三维 PdRu 纳米花（PdRu NFs）。这种具有丰富表面活性区域和修饰电子结构的纳米杂化物在甲醇氧化反应（MOR）和乙醇氧化反应（EOR）中的电催化活性方面有了很大的提高，其质量/比活性分别为 1739.5 mA mg-1/4.5 mA cm-2 和 4719.8 mA mg-1/12.3 mA cm-2，分别是商业 Pd/C 催化剂的 8.3/9.0 和 8.3/9.5 倍。更有趣的是，由于 NiZnP NSs 的显著促进作用，这种 3D-2D PdRu/NiZn 磷氧化物纳米杂化物甚至在 1000 个电位循环后，仍能保持 MOR 和 EOR 初始催化活性的 72.4%和 70.1%，而形态或组成几乎没有变化。这种新型电催化剂的成功构建为设计高性能电化学反应及其他反应的 3D-2D 纳米杂化物开辟了一条新途径。
