Electronic Modulation of Comn-Ldh on Tio2@C Via Heterogeneous Interface Engineering to Achieve High-Performance Overall Water Splitting

Abstract

Titanium dioxide (TiO2) is limited by low ion content and poor conductivity in the process of water electrolysis. Therefore, its modification are expected to achieve durable and efficient performance in alkaline electrocatalytic water splitting. Herein, CoMn-LDH-TiO2@C/NF heterogeneous structure electrocatalyst was prepared by a two-step method. Especially, the prepared CoMn-LDH-TiO2@C/NF-3 as bifunctional electrocatalyst exhibits excellent electrocatalytic activity and good stability. when a low overpotential of 193 mV for HER and 268 mV for OER at a current density of 10 mA cm-2 under alkaline conditions, and overall water splitting potential is 1.68 V. The excellent electrochemical performance of CoMn-LDH-TiO2@C/NF-3 can be attributed to the regulation of the electronic structure caused by the bimetallic synergies and the heterogeneous interface structure, which results in a lower kinetic energy barrier and improved charge transfer rate.

Keywords: Layered double hydroxides (LDH), TiO2, electronic structure modulation, Overall water splitting