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

• 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.

Subject headings

NATURVETENSKAP  -- Kemi -- Annan kemi (hsv//swe)

NATURAL SCIENCES  -- Chemical Sciences -- Other Chemistry Topics (hsv//eng)

Keyword

artificial photosynthesis

electrochemistry

manganese

turbostratic manganese oxide

water oxidation

Carbon

Carbon nanotubes

Electrocatalysts

Electrodes

Foams

Nanotubes

Nickel

Oxidation

Oxides

Yarn

Alkaline conditions

Annealing process

Catalytic current

Co-based catalysts

Oxygen-evolving complexes

Turbostratic

Manganese oxide

carbon nanotube

manganese derivative

oxide

water

catalysis

chemistry

electrochemical analysis

electrode

molecular mimicry

oxidation reduction reaction

photosystem II

procedures

solar energy

Electrochemical Techniques

Manganese Compounds

Nanotubes

Carbon

Oxidation-Reduction

Photosystem II Protein Complex

Kemi

Publication and Content Type

ref (subject category)

art (subject category)