Efficient Electrosynthesis of Valuable <i>para</i> ‐Benzoquinone from Aqueous Phenol on NiRu Hybrid Catalysts
Fuqiang Liu, Wei Chen, Tong Wang, Juchao Zhang, Deyong Yang, Yinhao Dai, Guizi Liu, Jian Zhou, Shuangyin Wang, Xiaohong Guan, Xiaohong Guan
Abstract
Abstract Electrocatalytic oxidation of aqueous phenol to para ‐benzoquinone ( p ‐BQ) offers a sustainable approach for both pollutant abatement and value‐added chemicals production. However, achieving high phenol conversion and p ‐BQ yield under neutral conditions remains challenging. Herein, we report a Ni(OH) 2 ‐supported Ru nanoparticles (NiRu) hybrid electrocatalyst, which exhibits a superior phenol conversion of 96.5 % and an excellent p ‐BQ yield of 83.4 % at pH 7.0, significantly outperforming previously reported electrocatalysts. This exceptional performance benefits from the triple synergistic modulation of the NiRu catalyst, including enhanced phenol adsorption, increased p ‐BQ desorption, and suppressed oxygen evolution. By coupling a flow electrolyzer with an extraction‐distillation separation unit, the simultaneous phenol removal and p ‐BQ recovery are realized. Additionally, the developed electrocatalytic system with the NiRu/C anode displays good stability, favorable energy consumption, and reduced greenhouse gas emissions for phenol‐containing wastewater treatment, demonstrating its potential for practical applications. This work offers a promising strategy for achieving low‐carbon emissions in phenol wastewater treatment.