Datta Abheek, Ziadi Zakaria, Kumar Pawan, Sasaki Toshio, Danielson Eric, Porkovich Alexander J
Okinawa Institute of Science and Technology (OIST) Graduate University, 1919-1 Tancha, Onna-Son, Okinawa 904-0495, Japan.
Nanoscale Horiz. 2020 Oct 1;5(10):1407-1414. doi: 10.1039/d0nh00344a. Epub 2020 Aug 27.
Tuning the metal support interaction (MSI) in heterogeneous catalysts is of utmost importance for various applications in different catalysis reactions. Pt-TiN systems are strong contenders for commercial catalysts, although the charge screening of Pt and non-involvement of N reduces their effective MSI and limits it to the Pt-Ti interface. Here, the bias driven landing of gas phase synthesized Pt nanoparticles (NPs) is used to change the nature of the MSI and enhance the charge transfer phenomenon. Bias driven landing of the Pt NPs translates their impact energies to the TiN surface, resulting in a weakening of the Ti-N bonds. This facilitates a new interaction between the Pt and N atoms, resulting in an electronic equilibration in the N-Pt-Ti triumvirate, nullifying the charge screening of Pt. This change in the nature of the MSI enables long range charge transfer throughout the catalyst surface and an increase in the electrocatalytic hydrogen evolution reaction (HER) activity of the Pt-TiN system.
调节多相催化剂中的金属-载体相互作用（MSI）对于不同催化反应中的各种应用至关重要。Pt-TiN体系是商业催化剂的有力竞争者，尽管Pt的电荷屏蔽和N的不参与降低了它们有效的MSI，并将其限制在Pt-Ti界面。在此，利用气相合成的Pt纳米颗粒（NPs）的偏压驱动着陆来改变MSI的性质并增强电荷转移现象。Pt NPs的偏压驱动着陆将它们的碰撞能量传递到TiN表面，导致Ti-N键减弱。这促进了Pt和N原子之间的新相互作用，导致N-Pt-Ti三元体系中的电子平衡，消除了Pt的电荷屏蔽。MSI性质的这种变化使得电荷能够在整个催化剂表面进行长程转移，并提高了Pt-TiN体系的电催化析氢反应（HER）活性。
