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Flexible Co–Mo–N/Au Electrodes with a Hierarchical Nanoporous Architecture as Highly Efficient Electrocatalysts for Oxygen Evolution Reaction
Author(s) -
Yao RuiQi,
Shi Hang,
Wan WuBin,
Wen Zi,
Lang XingYou,
Jiang Qing
Publication year - 2020
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.201907214
Subject(s) - overpotential , oxygen evolution , tafel equation , nanoporous , electrocatalyst , materials science , water splitting , bimetallic strip , chemical engineering , catalysis , electrolysis , cobalt , electrolysis of water , electron transfer , electrode , nanotechnology , inorganic chemistry , electrochemistry , chemistry , photochemistry , electrolyte , metallurgy , photocatalysis , biochemistry , engineering , metal
Designing highly active and robust electrocatalysts for oxygen evolution reaction (OER) is crucial for many renewable energy storage and conversion devices. Here, self‐supported monolithic hybrid electrodes that are composed of bimetallic cobalt–molybdenum nitride nanosheets vertically aligned on 3D and bicontinuous nanoporous gold (NP Au/CoMoN x ) are reported as highly efficient electrocatalysts to boost the sluggish reaction kinetics of water oxidation in alkaline media. By virtue of the constituent CoMoN x nanosheets having large accessible CoMoO x surface with remarkably enhanced electrocatalytic activity and the nanoporous Au skeleton facilitating electron transfer and mass transport, the NP Au/CoMoN x electrode exhibits superior OER electrocatalysis in 1 m KOH, with low onset overpotential (166 mV) and Tafel slope (46 mV dec −1 ). It only takes a low overpotential of 370 mV to reach ultrahigh current density of 1156 mA cm −2 , ≈140‐fold higher than free CoMoN x nanosheets. The electrocatalytic performance makes it an attractive candidate as the OER catalyst in the water electrolysis.