Thermodynamic‐guided synthesis for alloy oxide/carbon composites via bioabsorption strategy for supercapacitors

Abstract Accelerating industrialization introduces polymetallic contamination via industrial wastewater, excessive agrochemicals, and ore processing. These activities result in severe health consequences. Bioabsorption is a green and sustainable method for synthesizing electrode materials, enabling the transformation of biomass into high‐value materials and promoting a circular economy. In this study, thermodynamic phase diagram calculations and the “Alloying” material design concept are integrated into this method, facilitating the remediation and recycling of multi‐heavy metal composite pollutants in the environment and overcoming the electrochemical performance limitations of single‐metal materials. The alloy oxide/carbon composite electrode is successfully fabricated through a synergistic approach combining thermodynamic phase diagram calculations, KOH‐assisted high‐temperature pyrolysis, and biomass‐derived spatial confinement. This study elucidates the positive role of the alloy oxides prepared by this method in enhancing electrochemical performance. Specifically, the composite material exhibits a high specific surface area of 1,644.341 m 2 g −1 and a high degree of graphitization of I D / I G = 1.14, which delivers a specific capacitance of 616 F g −1 at 0.5 A g −1 and a capacity retention rate of 89.76% after 15,000 cycles. Specifically, the composite material exhibits a high specific surface area of 1644.341 m 2 g −1 and a high degree of graphitization of I D / I G = 1.14, which delivers a specific capacitance of 616 F g −1 at 0.5 A g −1 and a capacity retention rate of 89.76% after 15,000 cycles. This work drives energy transformation through innovative material design, contributing a key solution for developing sustainable, high‐performance, and recyclable green energy storage systems.