Graphene/Titanium dioxide/Iron Phosphide Composite with Low Platinum Catalysts for Efficient Methanol Oxidation
Received date: 2024-01-14
Online published: 2024-04-14
Due to the strong synergistic effect and bifunctional mechanism, Fe-Ti bimetallic catalysts have shown excellent catalytic activity in electro-chemistry. In order to solve the catalyst problems of high cost, low anti-toxicity, and poor cycling stability, a simple hydrothermal and low-temperature phosphating method was explored to prepare the graphene/titanium dioxide/iron phosphide composite with low platinum contents (Pt@rGO/TiO2-FeP) for methanol battery anode. Through the cyclic voltammetry (CV), chronoamperometry (CA), and the multipotential step method (STEP), the methanol oxidation performance was effectively enhanced by the low-temperature phosphatization. When the Pt loading at 4.3% (w), the catalyst peak current density reached 2319.5 mA•mg−1, which was 5.9 times higher than that of the commercial Pt/C catalyst (390.5 mA•mg−1). With a series of characterization methods such as scanning electron microscope (SEM), transmission electron microscope (TEM), energy dispersive X-ray spectroscopy (EDX), X-ray electron diffraction (XRD) and X-ray photoelectron spectroscopy (XPS), it was found that the titanium dioxide, iron phosphide and Pt nanoparticles were uniformly distributed on the surface of reduced graphene oxide (rGO). The methanol oxidation performance of this catalyst was improved because of the Fe-Ti bimetallic loading. The Pt@rGO/TiO2-FeP nanocomposites have excellent methanol oxidation performance and CO poisoning resistance, which provide a new idea and practice for the research and development of high-performance methanol fuel cells.
Zihang Wang , Jingwen Qian , Jiahui Xu , Haoyu Qiu , Menglong Yan , Yun Liu , Jie Luo , Yutai Sheng , Yi Chen , Xianbao Wang . Graphene/Titanium dioxide/Iron Phosphide Composite with Low Platinum Catalysts for Efficient Methanol Oxidation[J]. Acta Chimica Sinica, 2025 , 83(3) : 221 -228 . DOI: 10.6023/A24010013
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