氨基功能化MXene载铁氧还原催化剂的性能研究OA

Against the backdrop of rising global energy needs and pressing environmental concerns,the advancement of efficient and sustainable green energy technologies is paramount.Zinc-air batteries(ZABs)present a highly promising solution,offering a high theoretical energy density and zero-carbon emissions.However,their widespread adoption is limited by the sluggish kinetics of the oxygen reduction reaction(ORR)at the air cathode and the inherent high cost and poor stability of precious-metal catalysts.Herein,we innovatively prepared a NH2-MXene/FePc composite catalyst by anchoring iron phthalocyanine(FePc)onto amino-functionalized MXene(NH2-MXene)as the support.The influence of the 3-aminopropyltriethoxysilane(APTES)addition amount on the catalyst's structure and ORR performance was systematically studied.The optimized NH2-MXene/FePc-100 catalyst demonstrates exceptional ORR activity,characterized by a high half-wave potential of 0.92 V,a low Tafel slope of 65.94 mV/dec,and a dominant four-electron transfer pathway.Notably,it exhibits outstanding stability,showing a minimal E1/2 degradation of only 20 mV after 5 000 cycles of accelerated durability test cycles.Moreover,ZABs equipped with this catalyst achieve superior performance,delivering a peak power density of 182.3 mW/cm2 and a specific capacity of 774.7 mA·h/g which significantly surpasses that of commercial Pt/C-based devices.