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Electrocatalytic Water Oxidation Promoted by 3 D Nanoarchitectured Turbostratic δ‐MnO x on Carbon Nanotubes
Author(s) -
Zhang Biaobiao,
Li Yuanyuan,
Valvo Mario,
Fan Lizhou,
Daniel Quentin,
Zhang Peili,
Wang Linqin,
Sun Licheng
Publication year - 2017
Publication title -
chemsuschem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.412
H-Index - 157
eISSN - 1864-564X
pISSN - 1864-5631
DOI - 10.1002/cssc.201700824
Subject(s) - overpotential , manganese , water splitting , oxygen evolution , catalysis , electrolysis of water , carbon nanotube , nickel , materials science , inorganic chemistry , electrolysis , chemical engineering , oxide , carbon fibers , electrode , chemistry , nanotechnology , electrochemistry , photocatalysis , metallurgy , electrolyte , composite number , composite material , organic chemistry , engineering
The development of manganese‐based water oxidation electrocatalysts is desirable for the production of solar fuels, as manganese is earth‐abundant, inexpensive, non‐toxic, and has been employed by the Photosystem II in nature for a billion years. Herein, we directly constructed a 3 D nanoarchitectured turbostratic δ‐MnO x on carbon nanotube‐modified nickel foam (MnO x /CNT/NF) by electrodeposition and a subsequent annealing process. The MnO x /CNT/NF electrode gives a benchmark catalytic current density (10 mA cm −2 ) at an overpotential ( η ) of 270 mV under alkaline conditions. A steady current density of 19 mA cm −2 is obtained during electrolysis at 1.53 V for 1.0 h. To the best of our knowledge, this work represents the most efficient manganese‐oxide‐based water oxidation electrode and demonstrates that manganese oxides, as a structural and functional model of oxygen‐evolving complex (OEC) in Photosystem II, can also become comparable to those of most Ni‐ and Co‐based catalysts.