Urchin-Like Cobalt-Copper (Hydr)oxides as an Efficient Water Oxidation Electrocatalyst

• The development of e & xfb03;cient and low-cost oxygen evolution reaction (OER) catalysts is essential for the generation of clean hydrogen energy from water splitting. Herein, a novel hierarchical urchin-like cobalt-copper (hydr)oxide in situ grown on copper foam (CoCuOxHy(S)/CF) was synthesized through the electrochemical transformation of cobalt-copper sulfides (Co9S8-Cu1.81S) via anodization process. This CoCuOxHy(S)/CF anode exhibited a low overpotential (eta) of 274 mV at a current density of 100 mA cm(-2)with a robust durability over a period of 40 h when operated at 10 mA cm(-2). Further investigations imply that the unique nanowires aggregated urchin-like structure of CoCuOxHy(S) derived from the in situ anion exchange process could facilitate the exposure of active sites and accelerate electron transfer. More importantly, the incorporation of copper resulted in an electronic delocalization around the cobalt species, which contributed to reach a high-valent catalytically active cobalt species and further improved the OER performance.

Ämnesord

NATURVETENSKAP  -- Kemi -- Materialkemi (hsv//swe)

NATURAL SCIENCES  -- Chemical Sciences -- Materials Chemistry (hsv//eng)

Nyckelord

cobalt-copper hydroxides

electrocatalysis

oxygen evolution

transition-metal oxides

water splitting

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