National Laboratory of Solid State Microstructures and Jiangsu Provincial Key Laboratory for Nanotechnology , Nanjing University , Nanjing 210093 , China.
Collaborative Innovation Center of Advanced Microstructures , Nanjing University , Nanjing 210093 , China.
ACS Nano. 2018 Apr 24;12(4):3351-3359. doi: 10.1021/acsnano.7b08770. Epub 2018 Apr 5.
The promotion of magnetic field on catalytic performance has attracted extensive attention for a long time, and substantial improvements have been achieved in some catalysis fields. However, because the Zeeman energy is several orders of magnitude weaker, magnetic field seems unable to alter the band structure and has a negligible effect on semiconductor photocatalytic performance, which makes this task a great challenge. On the other hand, the spin-related behavior usually plays an important role in determining catalytic performance. For example, in some molecular catalysis, such as photosystem II, ferromagnetic alignment of the active material results in spin-oriented electrons, which are selected and accumulated at the interface, leading to great promotion of the oxygen evolution reaction activity. Here, we propose a magnetoresistance-related strategy to boost the carrier transfer efficiency and apply it in α-FeO/reduced graphene oxide hybrid nanostructures (α-FeO/rGO) to improve the photocatalytic performance under magnetic field. We show that both the degradation rate constant and photocurrent density of α-FeO/rGO can be dramatically enhanced with the application of magnetic field, indicating the promotion of the photocatalytic performance.
磁场对催化性能的促进作用长期以来一直受到广泛关注，并在一些催化领域取得了实质性的进展。然而，由于塞曼能要弱几个数量级，磁场似乎无法改变半导体的能带结构，对其光催化性能影响可以忽略不计，这使得这项任务极具挑战性。另一方面，自旋相关的行为通常在决定催化性能方面起着重要作用。例如，在一些分子催化中，如光合作用系统 II，活性材料的铁磁性排列导致自旋取向的电子在界面处被选择和积累，从而极大地促进了氧气析出反应的活性。在这里，我们提出了一种与磁阻相关的策略来提高载流子转移效率，并将其应用于α-FeO/还原氧化石墨烯杂化纳米结构（α-FeO/rGO）中，以提高磁场下的光催化性能。我们表明，在磁场的作用下，α-FeO/rGO 的降解速率常数和光电流密度都可以显著提高，表明光催化性能得到了提升。
