生物质焦油衍生氮掺杂多孔碳负载Co3O4纳米晶的制备及双功能氧反应催化

以生物质焦油活化多级孔碳为骨架，通过一步水热合成同时实现氮掺杂和Co₃O₄纳米粒子负载，获得Co₃O₄@N/C复合催化剂。对比研究结果表明，凭借复合材料中活性Co₃O₄和N掺杂结构之间的协同效应，Co₃O₄@N/C复合催化剂对氧还原（ORR）和析氧反应（OER）均表现出较高的催化活性，ORR和OER启动电位电势差ΔE为0.99V；其中，ORR极限扩散电流密度为-5.10mA/cm²，与贵金属Pt/C相当。此外，Co₃O₄@N/C具有优异的氧还原稳定性，在经3000次循环伏安法扫描后，Co₃O₄@N/C的极限扩散电流密度仍能保持89.9%。这一生物质焦油衍生碳所构筑的N掺杂多孔碳负载Co₃O₄纳米晶复合材料在燃料电池和金属空气电池等领域具有巨大的应用潜力。

Biomass tar-derived carbon doped with nitrogen to load Co3O4 nanocrystals as efficient bifunctional catalyst for oxygen reduction and evolution

Composite catalyst of nitrogen-doped meso-microporous carbon loaded with Co₃O₄ nanocrystals (Co₃O₄@N/C) was facilely prepared by a one-step hydrothermal process from the biomass tar-derived carbon matrix. The Co₃O₄@N/C composite exhibited excellent bifunctional catalytic activity toward oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) due to the synergistic effect between the nitrogen-doped structure and the Co₃O₄ nanocrystals. The onset potential gap ΔE between ORR and OER was 0.99V and the limiting diffusion current density was -5.10mA/cm², comparable to that of the Pt/C catalyst. Furthermore, the limiting diffusion current density of the Co₃O₄@N/C remained 89.9% of the initial value even after 3000cycles of CV scanning, manifesting the excellent long-term stability. The prepared composite presented great potential as a novel high-performance catalyst for fuel cells and metal-air batteries toward efficient and sustainable energy storage.