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Topotactic Transformations in an Icosahedral Nanocrystal to Form Efficient Water‐Splitting Catalysts
Author(s) -
Oh Aram,
Kim Ho Young,
Baik Hionsuck,
Kim Byeongyoon,
Chaudhari Nitin Kaduba,
Joo Sang Hoon,
Lee Kwangyeol
Publication year - 2019
Publication title -
advanced materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.707
H-Index - 527
eISSN - 1521-4095
pISSN - 0935-9648
DOI - 10.1002/adma.201805546
Subject(s) - electrocatalyst , overpotential , bifunctional , materials science , catalysis , nanocrystal , oxygen evolution , icosahedral symmetry , water splitting , dopant , proton exchange membrane fuel cell , chemical engineering , platinum , nanotechnology , inorganic chemistry , electrode , electrochemistry , chemistry , crystallography , doping , organic chemistry , optoelectronics , photocatalysis , engineering
Designing high‐performance, precious‐metal‐based, and economic electrocatalysts remains an important challenge in proton exchange membrane (PEM) electrolyzers. Here, a highly active and durable bifunctional electrocatalyst for PEM electrolyzers based on a rattle‐like catalyst comprising a Ni/Ru‐doped Pt core and a Pt/Ni‐doped RuO 2 frame shell, which is topotactically transformed from an icosahedral Pt/Ni/Ru nanocrystal, is reported. The RuO 2 ‐based frame shell with its highly reactive surfaces leads to a very high activity for the oxygen evolution reaction (OER) in acidic media, reaching a current density of 10 mA cm −2 at an overpotential of 239 mV, which surpasses those of previously reported catalysts. The Pt dopant in the RuO 2 shell enables a sustained OER activity even after a 2000 cycles of an accelerated durability test. The Pt‐based core catalyzes the hydrogen evolution reaction with an excellent mass activity. A two‐electrode cell employing Pt/RuO 2 as the electrode catalyst demonstrates very high activity and durability, outperforming the previously reported cell performances.