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HfN Nanoparticles: An Unexplored Catalyst for the Electrocatalytic Oxygen Evolution Reaction
Author(s) -
Defilippi Chiara,
Shinde Dipak V.,
Dang Zhiya,
Manna Liberato,
Hardacre Christopher,
Greer Adam J.,
D'Agostino Carmine,
Giordano Cristina
Publication year - 2019
Publication title -
angewandte chemie international edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 1433-7851
DOI - 10.1002/anie.201908758
Subject(s) - catalysis , oxygen evolution , nanoparticle , oxygen reduction reaction , electrocatalyst , chemical engineering , oxygen , materials science , chemistry , nanotechnology , electrochemistry , organic chemistry , electrode , engineering
Water electrolysis is one of the most promising methods to produce H 2 and O 2 as high potential fuels. Comparing the two half‐reactions, the oxygen evolution reaction (OER) is the more difficult to be optimized and still relies on expensive noble metal‐based catalysts such as Ru or Ir. In this paper, we prepared nanoparticles of HfN and Hf 2 ON 2 and tested them for the OER for the first time. The HfN sample, in particular, showed the highest activity, requiring an overpotential of only 358 mV at 10 mA cm −2 in Fe‐free electrolyte and, above all, exhibiting long‐term stability. This result places this system amongst one of the most promising catalysts for OER tested to date, in terms of sustainability, activity and stability. The prepared nanoparticles are small (less than 15 nm in diameter), well‐defined in shape and crystalline, and were characterised before and after electrochemical testing also via electron microscopy (EM), powder X‐ray diffraction (PXRD) and X‐ray photoelectron spectroscopy (XPS).