Preparation of expanded graphite supported Pt nanoparticle catalyst and its electrocatalytic performance in the direct methanol fuel cell
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摘要: 以天然鳞片石墨为基材，采用高氯酸插层氧化制备了膨胀石墨（EG），利用乙二醇液相还原法在其表面负载了Pt纳米颗粒；采用XRD、TEM、SEM及循环伏安曲线（CV）等手段对其形貌、结构及对甲醇的电催化性能进行了表征研究。结果表明，Pt纳米颗粒的平均粒径为2.56 nm，均匀地分布在膨胀石墨载体表面，而片状结构的膨胀石墨载体能明显提升其电催化活性和抗CO中毒性能；相同条件下，该膨胀石墨负载纳米Pt催化剂的质量活性比和电流密度分别是商用JM Pt/C的1.24倍和1.5倍。Abstract: Expanded graphite (EG) was prepared by intercalation oxidation of natural flake graphite with perchloric acid and Pt nanoparticles were then loaded on the surface of EG by means of liquid phase reduction method with ethylene glycol. The electrocatalytic performance of EG-supported Pt nanoparticle (Pt/EG) catalyst in the direct methanol fuel cell was investigated with the help of XRD, TEM, SEM and cyclic voltammetry (CV) characterizations. The results show that the Pt nanoparticles with average diameter of 2.56 nm are well dispersed on the surface of EG. The structure of expanded graphite sheets can obviously improve the electrocatalystic activity and tolerance to CO poisoning ability during methanol oxidation. Under the same conditions, the mass specific activity and the current density of current Pt/EG catalyst are 1.24 times and 1.5 times that of the commercial JM Pt/C, respectively.
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Key words:
- expanded graphite /
- electrocatalysts /
- Pt nanoparticle /
- methanol oxidation
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图 1 催化剂(a) JM Pt/C和(b) Pt/EG的XRD谱图
Figure 1 XRD patterns of (a) JM Pt/C and (b) Pt/EG catalysts
图 2 EG (a)的SEM和EG片状(b)的TEM照片
Figure 2 SEM image of EG (a) and TEM image of EG sheets (b)
图 4 催化剂(a) JM Pt/C和((b)、(c)) Pt/EG的TEM照片和(d) Pt/EG的EDX谱图
Figure 4 TEM images of (a) JM Pt/C, ((b) and (c)) Pt/EG and (d) EDX spectrum of Pt/EG
图 5 催化剂(a) JM Pt/C和(b) Pt/EG的TEM照片Pt粒子的粒径分布
Figure 5 Histograms of Pt particle size distribution of (a) JM Pt/C and (b) Pt/EG
图 6 JM Pt/C和Pt/EG催化剂在0.5 mol/L H2SO4溶液中的循环伏安图
Figure 6 Cyclic voltammograms of JM Pt/C and Pt/EG catalysts in 0.5 mol/L H2SO4 at a scan rate of 50 mV/s
图 7 JM Pt/C和Pt/EG催化剂在0.5 mol/L H2SO4+1.0 mol/L CH3OH溶液中的循环伏安图
Figure 7 Cyclic voltammograms of methanol oxidation on JM Pt/C and Pt/EG catalysts in 0.5 mol/L H2SO4 + 1.0 mol/L CH3OH solution at a scan rate of 50 mV/s
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