Supplementary information files for Probing the enhanced methanol electrooxidation mechanism on platinum-metal oxide catalyst

Supplementary information files for Probing the enhanced methanol electrooxidation mechanism on platinum-metal oxide catalystPt-metal oxide nanocomposites are classified as an alternative promising catalyst besides Pt-Ru nanoalloys for electrochemical methanol oxidation reaction (MOR), and yet the relevant enhancement mechanism for MOR remains largely elusive in terms of catalyst functions and reaction pathways. Herein, interface-rich Pt-SnO2 nanoflakes supported on reduced graphene oxide have been prepared and employed as a model catalyst for such a study. X-ray photoelectron spectroscopy and X-ray absorption spectroscopy measurements reveal significant electronic structure modification on Pt in contact with SnO2, concomitant with enhanced MOR. In-situ surface enhanced infrared absorption spectroscopy and on-line differential electrochemical mass spectrometry measurements indicate that the non-CO pathway is selectively enhanced on Pt-SnO2 compared to the CO pathway which prevails on Pt. DFT calculations reinforce that this electronic structure manipulation favors the non-CO reaction pathway on Pt-SnO2.

本数据集包含关于探查增强的甲醇电氧化机制在铂金属氧化物催化剂（Pt金属氧化物纳米复合材料）上的补充信息文件。Pt金属氧化物纳米复合材料被归类为一种替代的、有潜力的催化剂，它除了Pt-Ru纳米合金外，还适用于电化学甲醇氧化反应（MOR）。然而，在催化剂功能和反应路径方面，有关MOR的增强机制仍大部分难以捉摸。本研究中，制备了富集界面的Pt-SnO2纳米薄片，并将其负载于还原氧化石墨烯上，作为此类研究的模型催化剂。X射线光电子能谱和X射线吸收光谱测量揭示了Pt与SnO2接触时电子结构的显著改性，伴随着MOR的增强。原位表面增强红外吸收光谱和在线差分电化学质谱测量表明，与在Pt上占主导地位的CO路径相比，Pt-SnO2上非CO路径的选择性增强。密度泛函理论计算证实，这种电子结构操控有利于Pt-SnO2上的非CO反应路径。