The morphology- and size-tunable synthesis of nanocatalysts has attracted substantial research interest especially in catalysis. In this work, we synthesized free-standing Pd nanochain networks (Pd NCNs) and Pd nanodendrites (Pd NDs) through a direct poly-l-lysine (PLL)-mediated one-pot aqueous method. The presence of PLL and its concentrations were critical in this regard, showing PLL as the structure-directing and capping agents during the nucleation and crystal growth procedures. The synthesized architectures exhibited improved catalytic activity and enhanced durability towards formic acid oxidation and hydrogen evolution reactions relative to commercial Pd black catalyst. Moreover, the electrochemical active surface area and the electrocatalytic performance of Pd NCNs were dramatically enhanced in comparison to Pd NDs mainly owing to the unique network-like structure of Pd NCNs.

纳米催化剂的形态和大小可调的合成已经引起了广泛的研究兴趣，特别是在催化方面。在这项工作中，我们合成自立通过直接聚钯纳米链网络（钯NCNs）和Pd nanodendrites（钯NDS）升-赖氨酸（PLL）介导的一锅水法。在这方面，PLL的存在及其浓度至关重要，表明PLL是成核和晶体生长过程中的结构导向剂和加帽剂。相对于商用钯黑催化剂，合成的体系结构表现出改进的催化活性和对甲酸氧化和析氢反应的增强的耐久性。此外，与Pd NDs相比，Pd NCNs的电化学活性表面积和电催化性能显着提高，这主要归因于Pd NCNs独特的网络状结构。