Platinum (Pt) nanocatalysts, doped or alloyed with lanthanum (La), are promising candidates to promote the sluggish oxygen reduction reaction (ORR) kinetics. However, owing to the very low standard reduction potential of La³⁺ (−2.38 V), most synthetic routes to reduce La are costly and complex. Therefore, the preparation of highly active bimetallic PtLa nanocatalysts by simple and low‐cost synthesis methods is a challenging task. This work offers a feasible synthesis procedure for doping Pt nanocrystals with La in a simple solvothermal method. Elemental mapping and X‐ray photoelectron spectroscopy measurements indicate that metallic La is doped on the Pt catalyst surfaces. The La‐doped Pt nanocatalysts exhibit ORR mass activity of 0.49 A mg_Pt⁻¹ at 0.9 V, which is 2.3 and 2.7 times compared to Pt nanocatalysts without La dopant and commercial Pt/C, respectively.

中文翻译：

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在纳米级铂表面上溶剂热掺杂镧以改善氧的电还原性能

掺有镧（La）或与镧（La）合金化的铂（Pt）纳米催化剂有望促进缓慢的氧还原反应（ORR）动力学。但是，由于La ³⁺（-2.38 V）的标准还原电势很低，大多数合成La的合成途径成本高昂且复杂。因此，通过简单且低成本的合成方法制备高活性双金属PtLa纳米催化剂是一项艰巨的任务。这项工作提供了一种简单的溶剂热法用La掺杂Pt纳米晶体的可行合成方法。元素映射和X射线光电子能谱测量表明，金属La掺杂在Pt催化剂表面。La掺杂的Pt纳米催化剂的ORR活性为0.49 A mg _Pt ^-1 电压为0.9 V，分别是不含La掺杂剂和商业Pt / C的Pt纳米催化剂的2.3倍和2.7倍。