3 years ago

Electrocatalytic Water Oxidation Promoted by 3 D Nanoarchitectured Turbostratic δ-MnOx on Carbon Nanotubes

Electrocatalytic Water Oxidation Promoted by 3 D Nanoarchitectured Turbostratic δ-MnOx on Carbon Nanotubes
Peili Zhang, Lizhou Fan, Licheng Sun, Linqin Wang, Mario Valvo, Yuanyuan Li, Biaobiao Zhang, Quentin Daniel
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-MnOx on carbon nanotube-modified nickel foam (MnOx/CNT/NF) by electrodeposition and a subsequent annealing process. The MnOx/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. Turbo-active sites: A 3 D nanoarchitectured turbostratic δ-MnOx is directly constructed on carbon nanotube-modified nickel foam (MnOx/CNT/NF). The MnOx/CNT/NF electrode exhibits excellent performance for electrochemical water oxidation, giving a benchmark catalytic current density (10 mA cm−2) at an overpotential of 270 mV under alkaline conditions.

Publisher URL: http://onlinelibrary.wiley.com/resolve/doi

DOI: 10.1002/cssc.201700824

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