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Modular Design of Noble‐Metal‐Free Mixed Metal Oxide Electrocatalysts for Complete Water Splitting
Author(s) -
Gao Dandan,
Liu Rongji,
Biskupek Johannes,
Kaiser Ute,
Song YuFei,
Streb Carsten
Publication year - 2019
Publication title -
angewandte chemie
Language(s) - English
Resource type - Journals
eISSN - 1521-3757
pISSN - 0044-8249
DOI - 10.1002/ange.201900428
Subject(s) - water splitting , materials science , oxide , noble metal , chemical engineering , oxygen evolution , faraday efficiency , aqueous solution , catalysis , transition metal , composite number , electrode , nanotechnology , inorganic chemistry , metal , electrochemistry , chemistry , metallurgy , composite material , photocatalysis , organic chemistry , engineering
Electrocatalytic water splitting into H 2 and O 2 is a key technology for carbon‐neutral energy. Here, we report a modular materials design leading to noble metal‐free composite electrocatalysts, which combine high electrical conductivity, high OER and HER reactivity and high durability. The scalable bottom‐up fabrication allows the stable deposition of mixed metal oxide nanostructures with different functionalities on copper foam electrodes. The composite catalyst shows sustained OER and HER activity in 0.1 m aqueous KOH over prolonged periods ( t >10 h) at low overpotentials (OER: ≈300 mV; HER: ≈100 mV) and high faradaic efficiencies (OER: ≈100 %, HER: ≈98 %). The new synthetic concept will enable the development of multifunctional, mixed metal oxide composites as high‐performance electrocatalysts for challenging energy conversion and storage reactions.