Electron-Rich Co Sites via Heterointerface Engineering Enable Cl Repulsion and OH Affinity for Efficient Seawater Hydrogen Evolution.

Seawater electrolysis offers a sustainable pathway for green hydrogen production, but chloride-induced side reactions, particularly chlorine evolution (ClER), limit the stability and efficiency of catalysts. Based on an interface-engineering strategy, a bifunctional CoP-MXene electrocatalyst was designed and fabricated, in which electrons are transferred from the Ti sites of the MXene support to the adjacent Co active centers of CoP. This directional electron donation modulates the Co electronic structure, generating electron-rich Co sites that effectively suppress Cl adsorption via electronic repulsion while preserving the OH reaction pathways through favorable proton-electron coupling.

A novel composite anode via immobilizing of Ce-doped PbO on CoTiO for efficiently electrocatalytic degradation of dye.

The exploitation of efficient electrocatalyst is significantly important for degradation of refractory organic pollutants. Herein, a novel Ti/CoTiO/Ce-PbO composite electrocatalyst (abbreviated as CTO/CP) is successfully constructed via facile consecutive immersion pyrolysis and electro-deposition method and then systematically characterized by scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS), X-ray diffraction (XRD), Fourier Transform infrared spectroscopy (FT-IR), energy dispersive spectroscopy (EDS) and near infrared chemical imaging (NIR-CI). Importantly, the electrochemical measurements demonstrate that the CTO/CP possesses numerous prominent properties such as lower charge transfer resistance, larger electroactive area, higher oxygen evolution potential than those of the pristine Ti/CoTiO (CTO) and Ti/Ce-PbO (CP).