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Facile Synthesis of Mesoporous Nickel Cobalt Oxide for OER – Insight into Intrinsic Electrocatalytic Activity
Author(s) -
Broicher Cornelia,
Zeng Feng,
Artz Jens,
Hartmann Heinrich,
Besmehn Astrid,
Palkovits Stefan,
Palkovits Regina
Publication year - 2019
Publication title -
chemcatchem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.497
H-Index - 106
eISSN - 1867-3899
pISSN - 1867-3880
DOI - 10.1002/cctc.201801316
Subject(s) - overpotential , oxygen evolution , catalysis , mesoporous material , electrochemistry , electrolyte , electrocatalyst , nickel , oxide , cobalt , spinel , materials science , cobalt oxide , chemical engineering , inorganic chemistry , water splitting , chemistry , electrode , organic chemistry , photocatalysis , engineering , metallurgy
The development of novel metal oxide catalysts for electrochemical water splitting has been one of the future challenges in catalysis. We present the development of structured spinel based NiCo 2 O 4 materials using in‐situ hydrothermal synthesis and KIT‐6 as a template. Their electron transfer kinetics in the oxygen evolution reaction (OER) at pH 14 are studied. Structuring of NiCo 2 O 4 via KIT‐6 improves the intrinsic catalyst performance, e. g., a lower overpotential of ∼350 mV and a good long‐term stability could be observed compared to 385 mV and poor stability of commercially available NiCo 2 O 4 . Kinetic studies provided insights into structure‐activity relations and the nature of the electrode/electrolyte interface. Interestingly, structuring via KIT‐6 increases not only the electrochemical surface area but also the current density accompanied by superior charge transfer capacity.