直接甲酸燃料电池的突出的枝状Cu <sub>2</sub> O–Pt纳米结构阳极。,ACS Applied Materials & Interfaces

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直接甲酸燃料电池的突出的枝状Cu ₂ O–Pt纳米结构阳极。
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2017-05-22 00:00:00 , DOI: 10.1021/acsami.7b01565
Gumaa A. El-Nagar _{1,

2} , Ahmad M. Mohammad ₁ , Mohamed S. El-Deab ₁ , Bahgat E. El-Anadouli ₁

Affiliation

这项研究介绍了一种新型的能胜任的树枝状氧化铜-铂纳米催化剂（纳米铜₂ O-Pt），该催化剂固定在用于甲酸（FA）电氧化（FAO）的玻璃碳（GC）基质上；直接甲酸燃料电池（DFAFC）阳极室中的主要反应。有趣的是，与传统的铂纳米颗粒（nano-Pt）改性的GC（nano-Pt / GC）催化剂相比，拟议的催化剂对FAO表现出显着改善。通过将反应机理转向所需的直接路线生成二氧化碳（CO ₂）; 与减轻其他不希望的间接产生一氧化碳（CO）的途径保持一致；潜在的毒物会降低典型的Pt基催化剂的催化活性。此外，已开发的催化剂显示出合理的长期催化稳定性，并且直接降低了FAO的起始电势，从而最终降低了极化并放大了燃料电池的电压。据信所观察到的催化增强是双功能产生的。纳米铂是FA吸附的基础，而纳米结构的氧化铜（纳米铜₂ O）则起催化介质的作用，促进粮农组织期间的电荷转移，并在较低的电势下提供了激发毒气（CO）氧化的氧气气氛。此外，令人惊讶的是，纳米铜₂O通过“溢出机制”捕获中毒的CO，为直接粮农组织翻新Pt表面，从而诱导了纳米Pt活性位点的表面回收。最后，讨论了开发的催化剂对卤化物中毒的催化耐受性。

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Propitious Dendritic Cu2O–Pt Nanostructured Anodes for Direct Formic Acid Fuel Cells

This study introduces a novel competent dendritic copper oxide-platinum nanocatalyst (nano-Cu₂O–Pt) immobilized onto a glassy carbon (GC) substrate for formic acid (FA) electro-oxidation (FAO); the prime reaction in the anodic compartment of direct formic acid fuel cells (DFAFCs). Interestingly, the proposed catalyst exhibited an outstanding improvement for FAO compared to the traditional platinum nanoparticles (nano-Pt) modified GC (nano-Pt/GC) catalyst. This was evaluated from steering the reaction mechanism toward the desired direct route producing carbon dioxide (CO₂); consistently with mitigating the other undesired indirect pathway producing carbon monoxide (CO); the potential poison deteriorating the catalytic activity of typical Pt-based catalysts. Moreover, the developed catalyst showed a reasonable long-term catalytic stability along with a significant lowering in onset potential of direct FAO that ultimately reduces the polarization and amplifies the fuel cell’s voltage. The observed catalytic enhancement was believed to originate bifunctionally; while nano-Pt represented the base for the FA adsorption, nanostructured copper oxide (nano-Cu₂O) behaved as a catalytic mediator facilitating the charge transfer during FAO and providing the oxygen atmosphere inspiring the poison’s (CO) oxidation at relatively lower potential. Surprisingly, moreover, nano-Cu₂O induced a surface retrieval of nano-Pt active sites by capturing the poisoning CO via “a spillover mechanism” to renovate the Pt surface for the direct FAO. Finally, the catalytic tolerance of the developed catalyst toward halides’ poisoning was discussed.

更新日期：2017-06-01

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