Amorphous TiO x Stabilized Intermetallic Pt3Ti Nanocatalyst for Methanol Oxidation Reaction

作者：Zhang, Longhai; Zhang, Jiaxi; Tan, Weiquan; Zhong, Chengzhi; Tu, Yuanhua; Song, Huiyu; Du, Li; Liao, Shijun; Cui, Zhiming^*

来源：Nano Letters, 2023, 23(11): 5187-5193.

DOI：10.1021/acs.nanolett.3c01147

• Methanol oxidation reaction
• durability
• intermetallicPt(3)Ti
• TiO x
• strong metal-oxide interaction

Intermetallic compounds, featuring atomically orderedstructures,have emerged as a class of promising electrocatalysts for fuel cells.However, it remains a formidable challenge to controllably synthesizePt-based intermetallics during the essential high-temperature annealingprocess as well as stabilize the nanoparticles (NPs) during the electrocatalyticprocess. Herein, we demonstrated a Ketjen black supported intermetallicPt(3)Ti nanocatalyst coupled with amorphous TiO x species (Pt3Ti-TiO x /KB). The TiO x can not only confinePt(3)Ti NPs during the synthesis and electrocatalytic processby a strong metal-oxide interaction but also promote the waterdissociation for generating more OH species, thus facilitating theconversion of COad. The Pt3Ti-TiO x /KB showed a significantly enhanced mass activity(2.15 A mg(Pt) (-1)) for the methanol oxidationreaction, compared with Pt3Ti/KB and Pt/C, and presentedan impressively high mass activity retention (similar to 71%) after thedurability test. This work provides an effective strategy of couplingPt-based intermetallics with functional oxides for developing highlyperformed electrocatalysts.