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Stable CO anti-poisoning and high durability of a Pt electrocatalyst supported on carbon nanotubes

机译：碳纳米管上负载的Pt电催化剂具有稳定的CO抗毒作用和高耐久性

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Stable CO anti-poisoning and high durability of an anodic electrocatalyst are very important for direct methanol fuel cells (DMFCs). Here, we report a Pt electrocatalyst with stable CO tolerance and high durability, in which Pt nanoparticles were homogeneously deposited on poly(vinylpyrrolidone) wrapped carbon nanotubes and the Pt nanoparticles were further coated with poly(2,5-benzimidazole) (ABPBI) via in situ polymerization. Although the electrochemical surface area (ECSA) and methanol oxidation reaction (MOR) activity decreased by ～13% after coating the ABPBI layer on the Pt nanoparticles, the durability was dramatically enhanced due to the presence of ABPBI, which decelerates the Pt migration and aggregation. Meanwhile, the introduction of ABPBI to the electrocatalyst results in high and stable CO tolerance. After a durability test, the CO oxidation peak of the ABPBI coated electrocatalyst was almost stable (only 12 mV shift) compared to those of commercial (96 mV) and non-coated (108 mV) electrocatalysts. Thus, ABPBI is of importance to improve the durability and maintain stable CO tolerance of an electrocatalyst.
机译：对于直接甲醇燃料电池（DMFC），稳定的CO抗中毒作用和阳极电催化剂的高耐久性非常重要。在这里，我们报告了一种具有稳定的CO耐受性和高耐久性的Pt电催化剂，其中Pt纳米颗粒均匀地沉积在包裹有聚乙烯吡咯烷酮的碳纳米管上，并且Pt纳米颗粒还被聚（2,5-苯并咪唑）（ABPBI）<通过原位聚合。尽管在Pt纳米颗粒上涂覆ABPBI层后，电化学表面积（ECSA）和甲醇氧化反应（MOR）活性降低了约13％，但由于ABPBI的存在，耐久性得以显着提高，这降低了Pt的迁移和聚集。同时，将ABPBI引入电催化剂可实现高且稳定的CO耐受性。经过耐久性测试后，与商用（96 mV）和未涂覆（108 mV）电催化剂相比，ABPBI涂覆的电催化剂的CO氧化峰几乎稳定（仅变化12 mV）。因此，ABPBI对于提高耐久性和保持电催化剂的稳定的CO耐受性是重要的。

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