Plasmonic nanostructures have received significant attention in the field of solar-to-fuels conversion, because they can collect and utilize abundant low-energy photons to generate high-energy hot electrons for producing green chemical fuels. However, the ultrafast relaxation process of hot electron often leads to poor quantum yields of plasmonic nanostructures. Herein, we construct the one-dimensional W₁₈O₄₉/Carbon heterostructure for employing low-cost electrospun carbon fibers as the “electron mediator” to hinder the relaxation of hot electron in plasmonic W₁₈O₄₉ nanowires. We confirm that the IR-excited plasmonic hot electrons in W₁₈O₄₉ nanowires can quickly transfer to carbon fibers within only ∼50 fs in the W₁₈O₄₉/C heterostructure. This kinetics time is much shorter than the relaxation time of these hot electrons from high-energy surface plasmon (SP) to the ground state in W₁₈O₄₉ nanowires (∼5.5 ps). As a result, upon low-energy IR-light excitation, the W₁₈O₄₉/C heterostructures exhibit nearly 2-fold enhancement on the catalytic H₂ production from ammonia borane as compared to single W₁₈O₄₉ nanowires. Wavelength-dependent catalytic tests further indicate that this plasmon-enhanced catalytic activity is induced by the ultrafast transport process of plasmonic hot electron due to the localized surface plasmon resonance.

等离子体纳米结构在太阳能转化为燃料方面受到了广泛的关注，因为它们可以收集和利用丰富的低能光子来产生高能热电子，从而生产绿色化学燃料。但是，热电子的超快弛豫过程通常会导致等离激元纳米结构的量子产率差。在这里，我们构造一维W ₁₈ O ₄₉ /碳异质结构，以采用低成本的电纺碳纤维作为“电子介体”，以阻止热电子在等离激元W ₁₈ O ₄₉纳米线中的弛豫。我们确认W ₁₈ O ₄₉中的IR激发等离子体热电子在W ₁₈ O ₄₉ / C异质结构中，纳米线可以在仅约50 fs的时间内快速转移到碳纤维。此动力学时间比W ₁₈ O ₄₉纳米线中这些热电子从高能表面等离子体激元（SP）到基态的弛豫时间短得多（〜5.5 ps）。结果，在低能量的红外光激发下，与单个W ₁₈ O ₄₉相比，W ₁₈ O ₄₉ / C异质结构显示出从氨硼烷生产的催化H ₂几乎提高了2倍。纳米线。依赖于波长的催化测试进一步表明，由于局部表面等离子体激元共振，等离子体激元热电子的超快速传输过程诱导了这种等离子体激元增强的催化活性。