Hardy Shuwanto, Jenni Lie, Hairus Abdullah, Subur P. Pasaribu, Indra Masmur, None Tiffany, Nana Septiana Nur, None Kastario
A material concept constructed of NiCo2O4, NiFe2O4, and carbon was designed and synthesized by using a two-step process involving hydrothermal and flaming deposition methods and was further applied for overall water splitting. In this study, the electrocatalytic activities of NCO/NFO/C in alkaline conditions were studied and compared to its single phase of NiCo-LDH, NiCo2O4, and NiFe2O4, including the materials characterization (e.g., scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and Raman analyses). NCO/NFO/C was found as a 3D seaweed-like structure with an average particle size of 43.7 ± 2.1 nm. NCO/NFO/C electrocatalysts possess lower hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) overpotentials of 242 and 240 mV at 100 mA·cm-2 as well as smaller Tafel slope values of 54 and 31 mV·dec-1, respectively. Notably, NCO/NFO/C can be utilized as a bifunctional electrocatalyst for overall water splitting. NCO/NFO/C demonstrates a minimum cell voltage of 1.7 V at a current density of 100 mA·cm-2. This work emphasizes the excellent electrocatalytic performances of NCO/NFO/C for overall water splitting as well as the facile synthesis technique. © 2025 American Chemical Society.
Department of Industrial Engineering, Universitas Prima Indonesia, Medan, 20118, Indonesia; Department of Chemical Engineering, Widya Mandala Catholic University, Surabaya, 60114, Indonesia; Department of Chemistry, Faculty of Mathematics and Natural Sciences, Mulawarman University, Samarinda, 75123, Indonesia; Department of Chemistry, Faculty of Mathematics and Natural Sciences, Universitas Sumatera Utara, Medan, 20155, Indonesia; Department of Materials Science and Engineering, National Taiwan University of Science and Technology, No.43, Sec. 4, Keelung Road, Taipei, 10607, Taiwan