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Engineering a defect-rich high entropy oxides/carbon composites by soybean polysaccharide template for hydrogen
Xi Huang1, Ahmad Bin Amin1, Yiming Chen2
1School of Materials Science and Engineering, Zhengzhou University, Zhengzhou, Henan 450001, China; Henan International Joint Laboratory of Biomass Resources and Materials, Zhengzhou, Henan 450001, China.
Journal of Colloid and Interface Science
|July 16, 2026
Summary
High-entropy oxides (HEO) with optimized configurational entropy boost hydrogen evolution reactions. Soybean polysaccharide templating created FeCoNiZnMgOₓ/carbon (HEO/C) with oxygen vacancies, enhancing electrocatalytic performance.
Area of Science:
- Materials Science
- Electrochemistry
- Catalysis
Background:
- Optimizing configurational entropy is key for high-performance electrocatalysts.
- High-entropy oxides (HEO) offer multiple active sites and lattice distortion for enhanced reactions.
- Hydrogen evolution reaction (HER) requires efficient and stable electrocatalysts.
Purpose of the Study:
- To synthesize and characterize a novel high-entropy oxide/carbon composite (HEO/C) for electrocatalytic hydrogen evolution.
- To investigate the role of soybean polysaccharide as a template in controlling morphology and oxygen vacancies.
- To evaluate the electrocatalytic performance of the optimized HEO/C catalyst.
Main Methods:
- Synthesis of FeCoNiZnMgOₓ/carbon (HEO/C) composite using soybean polysaccharide as a template.
- Characterization of the HEO/C composite, focusing on nanoparticle morphology and oxygen vacancies.
- Electrochemical evaluation of HER performance, including overpotential and Tafel slope measurements.
Main Results:
- The soybean polysaccharide template resulted in a nanoparticle morphology and facilitated oxygen vacancy generation in HEO/C.
- The optimized HEO/C catalyst achieved 10 mA cm⁻² at an overpotential of 46 mV.
- The catalyst exhibited a Tafel slope of 74.0 mV dec⁻¹, indicating efficient hydrogen evolution kinetics.
Conclusions:
- Oxygen vacancy-rich high-entropy oxides/carbon composites are promising for advanced electrocatalysts.
- The facile synthesis method using polysaccharide templates offers a viable pathway for producing high-performance electrocatalysts.
- The optimized HEO/C catalyst demonstrates excellent electrocatalytic activity and stability for hydrogen evolution.
