用于直接甲醇燃料电池的高活性PtCo-CNT@TiO<sub>2</sub>复合纳米阳极催化剂

吕银荣; 孙维艳; 王峰

用于直接甲醇燃料电池的高活性PtCo-CNT@TiO₂复合纳米阳极催化剂

吕银荣^{1, 2},
孙维艳^{1, 2},
王峰^2, ,

1.
中北大学, 山西太原 030051
2.
太原工业学院, 山西太原 030008

基金项目:

山西省自然科学基金 201701D121040

详细信息

中图分类号: TM911.4
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- 被引次数: 0
出版历程
- 收稿日期: 2019-08-27
- 修回日期: 2019-10-27
- 网络出版日期: 2021-01-23
- 刊出日期: 2019-12-10

Highly active PtCo-CNT@TiO₂ composite nanoanode catalyst for direct methanol fuel cells

LÜ Ying-rong^{1, 2},
SUN Wei-yan^{1, 2},
WANG Feng^{2
, ,}

1.
North University of China, Taiyuan 030051, China
2.
Taiyuan Institute of Technology, Taiyuan 030008, China

Funds:

the Shanxi Natural Science Foundation 201701D121040

More Information

Corresponding author: WANG Feng, E-mail: 1037400468@qq.com

摘要

摘要: 采用溶胶凝胶法制备CNT@TiO₂载体，利用电沉积法制备用于直接甲醇燃料电池的PtCo-CNT@TiO₂阳极催化剂。采用透射电子显微镜（TEM）、X射线衍射（XRD）和电化学工作站对其进行表征。结果表明，PtCo-CNT@TiO₂复合纳米材料有明显的结晶，且金属粒子围绕在TiO₂包覆的碳纳米管的周围，用于直接甲醇燃料电池阳极催化剂具有较高的活性与稳定性。该PtCo-CNT@TiO₂催化剂的电化学比表面积为164 m²/g，65 ℃时甲醇的氧化峰电流达到45 mA/cm²，计时电流曲线表明300 s后PtCo-CNT@TiO₂的氧化电流趋于24 mA/cm²，在碱性条件下甲醇的氧化峰电流为39.7 mA/cm²。
- 电化学沉积 /
- 催化活性 /
- PtCo-CNT@TiO₂ /
- 复合纳米催化剂 /
- 直接甲醇燃料电池
Abstract: With CNT@TiO₂ prepared by sol-gel method as the support, the PtCo-CNT@TiO₂ composite was prepared by electro-deposition and used as the anode catalyst for direct methanol fuel cells. The PtCo-CNT@TiO₂ composite was characterized by transmission electron microscopy (TEM), X-ray diffraction (XRD) and electrochemical workstation. The results show that the PtCo-CNT@TiO₂ composite displays significant crystals and the metal particles surround the TiO₂-coated carbon nanotubes; when used as the anode catalyst for direct methanol fuel cells, it exhibits high activity and stability. The PtCo-CNT@TiO₂ catalyst has an electrochemical surface area of 164 m²/g and the oxidation peak current of methanol reaches 45 mA/cm² at 65 ℃; after 300 s, the oxidation current tends to be 24 mA/cm² and the oxidation peak current of methanol under alkaline conditions is 39.7 mA/cm².
- electrochemical deposition /
- catalytic activity /
- PtCo-CNT@TiO₂ /
- composite nano catalyst /
- direct methanol fuel cell

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图 1 CNT@TiO₂、Pt-CNT@TiO₂和PtCo-CNT@TiO₂复合催化剂的XRD谱图

Figure 1 XRD patterns of CNT@TiO₂, Pt-CNT@TiO₂ and PtCo-CNT@TiO₂ composite catalysts

(a): full spectra; (b): partially enlarged spectra
■: TiO₂; ●: Pt

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图 2 PtCo-CNT@TiO₂催化剂的TEM照片

Figure 2 TEM images of CNTs without loading any active species (a) and PtCo-CNT@TiO₂ (b)

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图 3 催化剂在硫酸甲醇溶液中的循环伏安曲线、电化学比表面积和氢吸附量和电化学阻抗

Figure 3 Cyclic voltammetric curve, surface area and hydrogen adsorption chart of various catalysts in methanol sulfate solution and electrochemical impedance map

(a): cyclic voltammogram of CNT@TiO₂; (b): cyclic voltammogram of Pt-CNT@TiO₂ and PtCo-CNT@TiO₂; (c): electrochemical surface area and hydrogen adsorption capacity of Pt-CNT@TiO₂ and PtCo-CNT@TiO₂; (d): electrochemical impedance of CNT, CNT@TiO₂, Pt-CNT@TiO₂ and PtCo-CNT@TiO₂

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图 4 甲醇在复合催化剂上电催化氧化的循环伏安曲线

Figure 4 Cyclic voltammograms of electrocatalytic methanol oxidation on the composite catalysts

a: forward scan cyclic voltammetry curve for PtCo-CNT@TiO₂; b: reverse scan cyclic voltammetry curve for PtCo-CNT@TiO₂; c: forward scan cyclic voltammetry curve for Pt-CNT@TiO₂; d: reverse scan cyclic voltammetry curve for Pt-CNT@TiO₂

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图 5 不同金属比例催化剂循环伏安曲线

Figure 5 Cyclic voltammetry curves of various catalysts with different metal ratios

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图 6 PtCo-CNT@TiO₂在0.5mmol/L H₂SO₄+0.5mmol/L CH₃OH溶液中的计时电流曲线

Figure 6 Curves of the polarization current vs. time for PtCo-CNT@TiO₂ in 0.5mol/L H₂SO₄ + 0.5mol/L methanol at room temperature

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图 7 PtCo-CNT@TiO₂不同温度下电催化氧化的循环伏安曲线

Figure 7 Cyclic voltammograms curves of PtCo-CNT@TiO₂ electrocatalytic oxidation at different temperatures

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图 8 PtCo-CNT@TiO₂不同扫描速率电催化氧化的循环伏安曲线(a)和I vs v^1/2图(b)

Figure 8 Cyclic voltammograms curves of PtCo-CNT@TiO₂ for electrocatalytic oxidation at different scanning velocities (a) and I vs v^1/2 diagrams (b)

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图 9 PtCo-CNT@TiO₂在酸碱性不同的甲醇溶液中的催化行为

Figure 9 Catalytic behavior of PtCo-CNT@TiO₂ in methanol solution with different acidities

(a): cyclic voltammetry curve measured under acidic conditions; (b): cyclic voltammetry curve measured under neutral conditions; (c): cyclic voltammetry curve measured under alkaline conditions; (d): cyclic voltammetry curve measured by commercial catalyst

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