Atomically dispersed Co-Nx sites anchored on t-ZrO2-embedded porous carbon derived from MOF-808 for enhanced oxygen reduction in alkaline media
以 MOF-808 衍生的嵌入 t-ZrO2 多孔碳錨定原子分散 Co-Nx 位點用於提升鹼性介質中氧還原反應
📄 英文摘要
Developing efficient, durable non-precious-metal catalysts for the oxygen reduction reaction (ORR) is critical for alkaline anion-exchange membrane fuel cells (AEMFCs). We report MOF-Co-900-NH3, featuring atomically dispersed Co-Nx sites in a nitrogen-doped carbon matrix anchored on tetragonal ZrO2 nanodomains. Synthesized via MOF-templated stabilization and NH3 activation, it exhibits a half-wave potential of 0.81 V and exceptional durability (only a 35 mV shift after 30,000 cycles), outperforming commercial Pt/C. In AEMFC tests, it delivers a peak power density of 359.2 mW cm-2, surpassing the Pt/C benchmark. Spectroscopic analyses reveal that NH3 activation optimizes the electronic structure of Co-Nx moieties, thereby improving charge transfer. This superior performance stems from the synergy among enriched Co-Nx sites, robust oxide-carbon interfaces, and hierarchical porosity, thereby establishing a viable strategy for next-generation Pt-free electrocatalysts.
📄 中文摘要
開發高效、耐用的非貴金屬觸媒，對鹼性陰離子交換膜燃料電池（AEMFC）的氧還原反應（ORR）至關重要。本研究報告 MOF-Co-900-NH3，其特點為原子分散的 Co-Nx 位點錨定於氮摻雜碳矩陣中的四方晶 ZrO2 奈米域。透過 MOF 模板穩定化與 NH3 活化合成，該觸媒展現 0.81 V 的半波電位及卓越的耐久性（30,000 次循環僅偏移 35 mV），超越商業 Pt/C。在 AEMFC 測試中，其巔峰功率密度達 359.2 mW cm-2，超越 Pt/C 基準。光譜分析揭示 NH3 活化優化了 Co-Nx 結構的電子態，提升了電荷轉移效率。此卓越性能源自於豐富 Co-Nx 位點、強健氧化物-碳介面與層次孔隙三者間的協同作用，為下一代無鉑電觸媒提供了可行策略。
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