Fabrication of Nanostructured Medium-Entropy Oxides/Carbon Composites with Rich O Vacancy by a Soybean Polysaccharide Template for Hydrogen Evolution Reaction

Highly efficient and durable electrocatalysts play a crucial role in promoting the hydrogen evolution reaction (HER). Among them, medium-entropy oxides (MEOs)-based electrocatalysts have attracted extensive attention due to the advantages of multiple principal components, lattice distortion, and a hysteresis diffusion effect. However, it is still challenging to design MEOs with rational structures and composition. In this work, soluble soybean polysaccharide (SSPS) is used as a template to fabricate an FeCoNiO