Graphene/Titanium dioxide/Iron Phosphide Composite with Low Platinum Catalysts for Efficient Methanol Oxidation

doi:10.6023/A24010013

Abstract

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.

Key words: transition bimetallic, graphene, low-temperature phosphating, methanol oxidation, low platinum loading

Cite this article

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.

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Fig. & Tab. 8

Figure 1. X-ray diffraction patterns of (a) TiO2 and (b) Pt@rGO/TiO2-FeP

Figure 2. SEM morphology images of (a) TiO2, (b) FeP and (c) Pt@rGO/TiO2-FeP with different resolutions

Figure 3. (a), (b) TEM morphology images of Pt@rGO/TiO2-FeP with different resolutions; (c) Electron diffraction spot pattern of Pt@rGO/TiO2-FeP; (d~f) Electron diffraction spot pattern of FeP, TiO2 and Pt; (g~l) EDS element distribution map of Pt@rGO/TiO2-FeP

Figure 4. (a) X-ray photoelectron spectroscopy of Pt@rGO/TiO2-FeP; (b~f) X-ray photoelectron spectra of C 1s, P 2p, Fe 2p, Ti 2p and Pt 4f

Figure 5. CVs of Pt@rGO/TiO2-FeP, Pt@rGO/TiO2, Pt@rGO/FeP and commercial Pt/C Catalysts in 0.5 mol?L?1 KOH＋1.0 mol?L?1 CH3OH: (a) CV curve of unit mass current density for methanol oxidation; (b) Chronoamperometry curves of －0.008 V, －0.086 V, －0.124 V and －0.131 V; (c) CV curves of methanol oxidation unit mass current density in a mixed solution of 0.5 mol?L?1 KOH and 1.0 mol?L?1 CH3OH with different titanium iron ratios; (d) Chronoamperometry curves of －0.008 V, －0.038 V, －0.056V, －0.060 V and －0.104 V

Figure 6. The Peak unit mass and unit area current density of Pt@rGO/TiO2-FeP, Pt@rGO/TiO2, Pt@rGO/FeP and commercial Pt/C Catalysts in 0.5 mol?L?1 KOH＋1.0 mol?L?1 CH3OH

Figure 7. Carbon monoxide stripping voltammetry test of (a) Pt@rGO/TiO2-FeP and (b) commercial Pt/C catalyst in 0.5 mol?L?1 KOH solution

Figure 8. The synthesis flowchart of Pt@rGO/TiO2-FeP

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