The Mechanism of One‐Step Synthesis of Oxides from Metal Chlorides and Their Electrocatalytic HER Study

Abstract

It is well known that a layered structure can improve charge transfer and is a favorable catalyst material. Most of them are metal oxides, and some metal hydroxides and carbonates have also been proved to have good catalytic performance. Generally, the preparation method is to prepare the precursor and then calcinate them to get metal oxides. Through literature review and repeated experiments, it is found that cationic membrane electrosynthesis with CeCl3·7H2O as a raw material may be able to prepare metal oxides in one step. Furthermore, whether Fe, which is also a variable metal, can also form metal oxides in one step is investigated. Therefore, in this study, CeO2, Fe3O4, and Fe2O3 nanomaterials with the hierarchical structure are prepared by cationic membrane electrolytic synthesis at room temperature. The composition and microstructure of the nanomaterials are studied using XRD, FTIR, XPS, and SEM. Finally, the electrochemical hydrogen evolution performance of the samples is simply tested.

Two-Dimensional Metal–Organic Frameworks and Their Derivative Electrocatalysts for Water Splitting

“…Under acidic conditions, hydrogen ions undergo reduction to form hydrogen, with the equilibrium half-cell potential being 0 V. Meanwhile, under alkaline conditions, water molecules are reduced to produce hydrogen and hydroxyl groups, resulting in an equilibrium half-cell potential of 0.83 V. The HER is a cathodic process involving a two-electron transfer. It has been observed that HER primarily follows either the Volmer-Tafel path or the Volmer-Heyrovsky path, as shown in Equations ( 1)-( 6) [140][141][142][143][144][145]. HER tends to occur via the Volmer-Tafel path or the Volmer-Heyrovsky path, given in Equations ( 1)-( 6).…”