脉冲激光沉积的长轴RuO薄膜的结构和电催化研究
Ghanashyam Gyawali1, Mengxin Liu1, Ikenna Chris-Okoro1
1Department of Mechanical Engineering, North Carolina A&T State University, Greensboro, North Carolina 27411, United States.
概括
在蓝宝石基板上的较厚的氧化 (RuO2) 薄膜显示出氧化物进化的优越电催化特性. 较厚的薄膜中较低的电阻可以增强电荷传输,使它们成为催化剂的经济有效替代品.
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
- 催化剂是一种催化剂.
背景情况:
- 氧化物 (RuO2) 是一个有前途的电催化剂.
- 在具有成本效益的基板上开发RuO2膜对于实际应用至关重要.
- 优化薄膜厚度是提高催化性能的关键.
研究的目的:
- 在蓝宝石基板上合成和表征不同厚度的表层 RuO2 薄膜.
- 为了研究薄膜厚度对氧化演化反应 (OER) 的电催化活性的影响.
- 为了将薄膜特性与OER性能相关联.
主要方法:
- 在蓝宝石基板上使用脉冲激光沉积 (PLD) 合成了Epitaxial RuO2薄膜.
- 通过使用不同激光脉冲,制备了两套不同厚度 (40nm和87nm) 的膜.
- 测量了结构性,形态性和电化学性质 (板电阻,超电位,电荷转移电阻).
主要成果:
- 两套片均表现出相似的生长率,结晶度和粒度边界密度,表面粗度略有差异.
- 较厚的RuO2薄膜 (87nm) 显示了较低的板电阻 (6.7 Ω/□) 和较低的OER超电位 (280mV在100μA/cm2).
- 更薄的RuO2薄膜 (40nm) 具有更高的板电阻 (15.7 Ω/□),更高的电荷转移电阻 (250 Ω) 和更高的OER超电位 (320mV).
结论:
- 薄膜厚度显著影响OER的RuO2的电催化性能.
- 较厚的RuO2膜中的较低电阻促进了电荷转移,从而提高了电催化活性.
- 蓝宝石上的Epitaxial RuO2薄膜为高性能电催化提供了一种具有成本效益的方法.
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