Nitrogen and Oxygen Dual‐Doped Carbon Hydrogel Film as a Substrate‐Free Electrode for Highly Efficient Oxygen Evolution Reaction

A three-dimensional (3D) electrode composed of nitrogen, oxygen dualdoped graphene-carbon nanotube hydrogel film is fabricated, which greatly favors the transport and access of gas and reaction intermediates, and shows a remarkable oxygen-evolution catalytic performance in both alkaline and acidic solutions.

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