Preparation and application study of nickel-based metal-organic frameworks composite graphite flakes electrode materials for acidic electrolytic oxidized water.

The article focuses on the preparation and application of a nickel-based metal-organic framework (Ni-MOF) composite electrode grown on graphite flakes (Ni-MOF/GPH) for enhancing the chlorine evolution reaction (CER) in the production of acidic electrolytic oxidized water (AEOW), an effective disinfectant. The Ni-MOF/GPH electrode demonstrated superior CER activity and selectivity over oxygen evolution reaction (OER), with a low overpotential of 158.3 mV at 10 mA cm⁻² and a large potential difference (ΔE_CER-OER) of 488 mV, contributing to improved AEOW generation. Optimal electrolysis conditions were identified as 16 V voltage, 1.5–2.0 g L⁻¹ NaCl electrolyte concentration, and 70 minutes electrolysis time, producing AEOW with 70 mg L⁻¹ available chlorine content that achieved up to 99.9% sterilization of Escherichia coli within 15 minutes. This study suggests that the Ni-MOF/GPH electrode is a promising, cost-effective alternative to precious metal electrodes for AEOW preparation and chlorine generation in acidic media.