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Solvothermal Doping of Lanthanum on Nanoscale Platinum Surfaces to Improve Oxygen Electroreduction Performance
Author(s) -
Kim Jeonghyeon,
Kabiraz Mrinal Kanti,
Lee Wonkyun,
Hwang Gyo Hyun,
Choi SangIl
Publication year - 2020
Publication title -
chemelectrochem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.182
H-Index - 59
ISSN - 2196-0216
DOI - 10.1002/celc.202000579
Subject(s) - nanomaterial based catalyst , bimetallic strip , platinum , lanthanum , materials science , catalysis , dopant , doping , x ray photoelectron spectroscopy , lanthanide , inorganic chemistry , nanotechnology , chemical engineering , metal , chemistry , nanoparticle , metallurgy , optoelectronics , ion , organic chemistry , engineering
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 La 3+ (−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.