Song Zhongxin, Zhou Xia, Sun Lidan, Zhang Qingfeng, Li Yongliang, Ren Xiangzhong, Zhang Hong, Zhang Lei
College of Chemistry and Environmental Engineering, Shenzhen University, Shenzhen 518060, PR China.
School of Materials and Energy, Electron Microscopy Centre, Lanzhou University, Lanzhou 730000, PR China.
J Colloid Interface Sci. 2024 Jan 15;654(Pt B):1272-1280. doi: 10.1016/j.jcis.2023.10.120. Epub 2023 Oct 27.
The stabilization of platinum (Pt) catalysts through strong metal-support interactions is crucial for their successful implementation in fuel cell applications. Tungsten oxide (WO) has demonstrated excellent CO tolerance and has been recognized as a promising substrate for anchoring and stabilizing Pt nanoparticles (NPs). However, the limited specific surface area of conventional tungsten oxide restricts its effectiveness in dispersing noble metal NPs. In this study, we present a pioneering approach by employing atomic layer deposition (ALD) to create a WO interlayer between Pt NPs and a carbon substrate. Using nitrogen-doped carbon nanotubes (NCNT) as the foundation, WO nanoparticles (2-5 nm) were selectively synthesized, followed by the subsequent deposition of Pt NPs using a bottom-up approach. The Pt-WO-NCNT catalyst, with a WO bridge layer effectively inserted between the active site and carbon support, has displayed a notable augmentation in electrocatalytic activity and notable stability when compared to commercial Pt catalysts in oxygen reduction reaction (ORR). The detailed microstructure and the enhanced electrochemical reaction mechanism of Pt-WO-NCNT catalyst has been investigated by X-ray adsorption spectrum and density functional theory (DFT) calculations. This work presents an innovative approach for enhancing the stability of Pt catalysts through the utilization of the ALD technique.
通过强金属-载体相互作用来稳定铂（Pt）催化剂对于其在燃料电池应用中的成功实施至关重要。氧化钨（WO）已表现出优异的一氧化碳耐受性，并被认为是锚定和稳定铂纳米颗粒（NPs）的有前途的基底。然而，传统氧化钨有限的比表面积限制了其在分散贵金属纳米颗粒方面的有效性。在本研究中，我们提出了一种开创性的方法，即采用原子层沉积（ALD）在铂纳米颗粒和碳基底之间创建一个WO中间层。以氮掺杂碳纳米管（NCNT）为基础，选择性地合成了WO纳米颗粒（2 - 5纳米），随后采用自下而上的方法沉积铂纳米颗粒。在氧还原反应（ORR）中，与商业铂催化剂相比，具有有效插入在活性位点和碳载体之间的WO桥层的Pt-WO-NCNT催化剂表现出显著增强的电催化活性和显著的稳定性。通过X射线吸附光谱和密度泛函理论（DFT）计算研究了Pt-WO-NCNT催化剂的详细微观结构和增强的电化学反应机理。这项工作提出了一种通过利用ALD技术提高铂催化剂稳定性的创新方法。
