Herein, we report the low temperature hydrothermal synthesis of delafossite CuCoO₂ crystals at 100 °C. The structural, morphological and compositional characterization of CuCoO₂ crystals was performed by powder X-ray diffraction (PXRD), field-emission scanning electron microscopy (FESEM) and X-ray photoelectron spectroscopy (XPS). Furthermore, the thermal stability of CuCoO₂ in air and its electro-catalytic activity toward the oxygen evolution reaction (OER) have also been investigated.