Efficient Preparation and Electrochemical Properties of BiOCl/Graphite by One-step Solvothermal Method

We used the surface-pretreated graphite paper (Gp) as a carrier and loaded BiOCl with high selectivity to Cl⁻ on its surface by solvothermal method to form BiOCl@Gp electrode. The morphology, structure, and composition of the materials were characterized by scanning electron microscopy and nitrogen adsorption/desorption, and the results showed that the spherical BiOCl particles were uniformly dispersed on the surface of the Gp, forming a mesoporous BiOCl@Gp composite with a specific surface area of 22.82 m²/g and a pore volume of 0.043 cm³/g. Furthermore, cyclic voltammetry and electrochemical impedance spectroscopy were used to test the electrochemical properties of the composites, and the stability of BiOCl and the high conductivity of Gp were synergistic, the BiOCl@Gp exhibited a specific capacitance of 30.2 F·g⁻¹ at a current density of 0.5 A·g⁻¹, and the selectivity of the BiOCl@Gp materials for Cl− was significantly higher than that of SO₄²⁻, NO₂⁻, and HCO₃⁻. Therefore, BiOCl@Gp composite electrode materials can be used for the selective adsorption of Cl⁻ in wastewater, in order to achieve efficient wastewater recycling.