Effect of urea and ammonium fluoride ratio on CuCo2S4/NF as a highly efficient HER catalyst

Abstract

CuCo₂S₄ as a spinel-structured transition metal sulfide is a highly effective HER catalyst due to its excellent endurance, low overpotential, and low Tafel slope. In this work, the CuCo₂S₄/Ni foam (NF) catalysts with various morphologies have been successfully synthesized by controlling the ratio of urea and ammonium fluoride (NH₄F) based on the hydrothermal method. Urea and NH₄F ratio exhibit a great influence on the microstructure and the HER catalytic performance of CuCo₂S₄/NF catalysts is discussed in detail.