MOF-199-Based Nitrogen-Doped Bimetal Cathode Catalyst for Anion Exchange Membrane Fuel Cells
基於 MOF-199 的氮摻雜雙金屬陰極觸媒用於陰離子交換膜燃料電池
📄 英文摘要
Anion exchange membrane fuel cells (AEMFCs) face significant challenges in developing cost-effective and high-performance cathode catalysts for the oxygen reduction reaction (ORR). This study reports a MOF-199-derived nitrogen-doped bimetal (Cu/Fe) carbon-based catalyst (PSM-199-900-AL) as a promising non-precious metal cathode catalyst for AEMFCs. The optimal thermal treatment at 900 °C yields a catalyst with exceptional ORR activity in alkaline media, achieving an onset potential of 0.99 V, a half-wave potential of 0.846 V, and a near-four-electron transfer pathway (n = 3.997). The Cu2+/Fe0 dual active sites work cooperatively: Fe activates O₂ while Cu facilitates intermediate desorption, synergistically enhancing ORR kinetics. When evaluated in an AEMFC, PSM-199-900-AL delivers a peak power density of 352.2 mW/cm², comparable to commercial Pt/C (381.9 mW/cm²). Moreover, the catalyst demonstrates outstanding durability with only a 30 mV half-wave potential loss after 30,000 cycles. This work highlights the great potential of MOF-derived bimetal catalysts as efficient and stable cathode materials for next-generation AEMFCs.
📄 中文摘要
陰離子交換膜燃料電池（AEMFC）在開發具成本效益且高效能的氧還原反應（ORR）陰極觸媒方面面臨重大挑戰。本研究報告了一種 MOF-199 衍生的氮摻雜雙金屬（Cu/Fe）碳基觸媒（PSM-199-900-AL），作為 AEMFC 的非貴金屬陰極觸媒。900°C 的最佳熱處理使觸媒在鹼性介質中展現卓越的 ORR 活性，起始電位達 0.99 V，半波電位達 0.846 V，接近四電子轉移途徑（n = 3.997）。Cu²⁺/Fe⁰ 雙活性位點協同工作：Fe 活化 O₂，而 Cu 促進中間產物脫附，協同增強 ORR 動力學。當在 AEMFC 中評估時，PSM-199-900-AL 的峰值功率密度為 352.2 mW/cm²，與商用 Pt/C（381.9 mW/cm²）相當。此外，該觸媒展現出色的耐久性，經過 30,000 次循環後半波電位僅下降 30 mV。本工作強調了 MOF 衍生雙金屬觸媒作為下一代 AEMFC 高效穩定陰極材料的巨大潛力。
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