The performance of Pd/Pt-based electrocatalysts is closely correlated with their surface structure, size and composition. Herein, we prepared uniformly distributed ultra-small PtPd alloyed nanoparticles (PtPd ANPs, ∼5 nm) within a robust three-dimensional nitrogen-doped reduced graphene oxide (3D-N-rGO) under hydrothermal conditions. l-Hydroxyproline was employed as reductant, N-doping and swelling agent for 3D-N-rGO. The size and shape of graphene hydrogels were easily adjusted by controlling the reaction temperature, and the formation mechanism was discussed in details. Then, the product was explored for ethylene glycol oxidation reaction (EGOR) and hydrogen evolution reaction (HER). The catalytic activity of PtPd ANPs/3D-N-rGO towards HER is close to the state-of-the-art Pt/C catalyst, and better than that of Pt/C in the case of EGOR. This study has shed some lights on the universal approach to develop next-generation catalysts, which is of great significance for direct alcohol fuel cells.

Pd / Pt基电催化剂的性能与其表面结构，尺寸和组成密切相关。本文中，我们在水热条件下，在坚固的三维氮掺杂还原氧化石墨烯（3D-N-rGO）中制备了均匀分布的超小PtPd合金纳米颗粒（PtPd ANP，〜5 nm）。升-羟基脯氨酸被用作3D-N-rGO的还原剂，N-掺杂和溶胀剂。通过控制反应温度可以容易地调节石墨烯水凝胶的大小和形状，并详细讨论了其形成机理。然后，对产物进行乙二醇氧化反应（EGOR）和析氢反应（HER）的研究。PtPd ANPs / 3D-N-rGO对HER的催化活性接近最新的Pt / C催化剂，在EGOR情况下优于Pt / C。这项研究为开发下一代催化剂的通用方法提供了一些启示，这对于直接酒精燃料电池具有重要意义。