ArticleACS omega2025
Efficient Electrocatalytic Ammonia Synthesis via Spirulina Biomass Based on High-Entropy Alloy.
Article in ACS omega, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
To address persistent challenges of low ammonia yield and Faradaic efficiency (FE) in electrocatalytic nitrogen reduction, this work pioneers a breakthrough strategy utilizing nitrogen-enriched spirulina biomass as the nitrogen source coupled with high-entropy alloy (HEA) catalysts. This novel electrocatalytic synthesis route establishes a sustainable pathway for green ammonia production. The MnFeNiCuAl and MnFeNiCuCo HEAs were synthesized via a coprecipitation method. Structural analysis reveals that MnFeNiCuAl exhibits a pure face-centered cubic (FCC) phase, and the Al element incorporation suppresses high-temperature sintering and mitigates compositional segregation. Its oxygen vacancy concentration is higher than that of the MnFeNiCuCo HEO, which can optimize the multielectron transfer kinetics, thereby enhancing the electrocatalytic performance. Electrocatalytic tests using four amino acid model compounds from spirulina (glutamate, histidine, leucine, and phenylalanine) revealed superior activity of the MnFeNiCuAl catalyst compared to that of MnFeNiCuCo. The MnFeNiCuAl HEA catalyst was then employed for the spirulina electrolysis, which achieved a high NH
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