在电催化剂中化石墨支的应用:对碳支表面化学,纳米粒子生长和电催化活动的影响
Christopher Tremblay1,2,3, Ian Booth, Spencer Thomas1,2,3
1Department of Chemistry, University of Victoria, 3800 Finnerty Road, Victoria, BC V8P 5C2, Canada.
ACS applied materials & interfaces
|January 8, 2025
概括
研究人员通过使用化石墨烯支用于- (PtNi) 催化剂,提高了质子交换膜燃料电池 (PEMFC) 的耐用性. 这种方法显著提高了催化剂的稳定性和性能保留,解决了燃料电池技术的一个关键挑战.
科学领域:
- 材料科学 材料科学 材料科学
- 电化学 电化学 电化学
- 纳米技术 纳米技术
背景情况:
- 质子交换膜燃料电池 (PEMFC) 面临着耐用性挑战,主要是由于催化剂支的碳腐蚀.
- 提高催化剂支耐用性对于实现8000个运行小时的目标,以最小的性能损失至关重要.
- 疏水性催化剂支,如高度石墨化的碳,对于增强燃料电池寿命有兴趣.
研究的目的:
- 开发一种方法来提高PEMFC中碳支的耐用性.
- 为了利用化石墨烯的疏水性质,提高催化剂支稳定性.
- 合成和描述化石墨烯纳米板块作为空洞多孔PtNi纳米颗粒的支.
主要方法:
- 化石墨烯纳米板块是使用伯奇还原合成的.
- 在这些化石墨烯支器上制备了空心多孔的PtNi纳米粒子.
- 进行的表征包括TEM,STEM-EDS,XRD,FT-IR,拉曼光谱,XPS和IL-TEM.
- 为了评估耐用性,进行了加速压力测试 (6000个周期,1.01.6V与RHE).
主要成果:
- 石墨烯的化显著影响了纳米粒子形态,并提高了电化学稳定性.
- 化支将保留的电化学表面积从36.8%增加到61.9%.
- 在化支持下,保留的催化活性从26.6%提高到53.0%.
- 拉曼光谱显示在应力测试期间化复合材料的碳腐蚀最小.
结论:
- 化石墨烯纳米板块作为PEMFC中的PtNi催化剂的有效,持久的支.
- 化石墨烯的疏水性质减轻了碳腐蚀,提高了催化剂的寿命.
- 这种方法提供了一个有希望的策略,以克服PEMFC技术的耐用性限制.
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