Clarifying the luminescence mechanism of nitrogen related surface states for carbon dots.

The design and synthesis of bifunctional heterostructure catalysts can effectively achieve excellent bi-function electrolyzed water catalyzed reactions. Nevertheless, it remains a challenge to explore the exact active centers for the...

Cobalt trioxide is a promising cobalt-based oxygen evolution reaction (OER) electrocatalyst, and its OER performance is limited by its low ratio of Co 3+ to Co 2+ ions and the dispersibility of nanoparticles. Here we report a simple method to improve the OER catalytic activity via loading Co 3 O 4 nanoparticles onto boron carbon oxynitride (BCNO) nanosheets, which greatly decreases the overpotential (∼80 mV) and improves the stability of the Co 3 O 4 nanoparticles. The Co 3 O 4 /BCNO nanocomposite exhibits a good OER performance with a small Tafel slope of 57.58 mV/dec and a low overpotential of 317 mV (vs RHE at 10 mA/cm 2 ) under alkaline conditions. The high OER performance of the Co 3 O 4 /BCNO nanocomposite is induced by the larger active surface area and higher ratio of Co 3+ to Co 2+ ions as well as the formation of Co-N chemical bonds.

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