Wang Wenwen, Bai Xinyi, Yuan Xiaochu, Liu Yumin, Yang Lin, Chang Fangfang
Collaborative Innovation Centre of Henan Province for Green Manufacturing of Fine Chemicals, Key Laboratory of Green Chemical Media and Reactions, Ministry of Education, School of Chemistry and Chemical Engineering, Henan Normal University, Xinxiang 453007, China.
Materials (Basel). 2023 Jan 15;16(2):840. doi: 10.3390/ma16020840.
The compositions and surface facets of platinum (Pt)-based electrocatalysts are of great significance for the development of direct alcohol fuel cells (DAFCs). We reported an approach for preparing ultrathin PtCo nanowire (NW) catalysts with high activity. The PtCo NW alloy catalysts synthesized by single-phase surfactant-free synthesis have adjustable compositions and (111) plane and strain lattices. X-ray diffraction (XRD) results indicate that the alloy composition can adjust the lattice shrinkage or expansion of PtCo NWs. X-ray photoelectron spectroscopy (XPS) results show that the electron structure of Pt is changed by the alloying effect caused by electron modulation in the d band, and the chemical adsorption strength of Pt is decreased, thus the catalytic activity of Pt is increased. The experimental results show that the activity of PtCo for the oxidation of methanol and ethanol is related to the exposed crystal surface, strain lattice and composition of catalysts. The PtCo NWs exhibit stronger electrocatalytic performance for both methanol oxidation reaction (MOR) and ethanol oxidation reaction (EOR). The dominant (111) plane PtCo exhibits the highest electrocatalytic activity in MOR, which is supported by the results of XPS. This discovery provides a new pathway to design high activity, stability nanocatalysts to enhance direct alcohol fuel cells.
铂（Pt）基电催化剂的组成和表面晶面对于直接醇类燃料电池（DAFCs）的发展具有重要意义。我们报道了一种制备具有高活性的超薄PtCo纳米线（NW）催化剂的方法。通过无单相表面活性剂合成法合成的PtCo NW合金催化剂具有可调节的组成以及（111）面和应变晶格。X射线衍射（XRD）结果表明，合金组成可以调节PtCo NWs的晶格收缩或膨胀。X射线光电子能谱（XPS）结果表明，Pt的电子结构因d带中电子调制引起的合金化效应而发生变化，Pt的化学吸附强度降低，从而提高了Pt的催化活性。实验结果表明，PtCo对甲醇和乙醇氧化的活性与催化剂的暴露晶体表面、应变晶格和组成有关。PtCo NWs对甲醇氧化反应（MOR）和乙醇氧化反应（EOR）均表现出较强的电催化性能。占主导的（111）面PtCo在MOR中表现出最高的电催化活性，这得到了XPS结果的支持。这一发现为设计高活性、稳定性的纳米催化剂以增强直接醇类燃料电池提供了一条新途径。
