在MoO2上通过Ni合金对Ru站点进行调结,可实现有效的性进化,用于离子交换膜水电解
Goeun Lee1,2, Sang Eon Jun1,3, Jiheon Lim1,3
1Division of Chemical and Material Metrology, Korea Research Institute of Standards and Science (KRISS), Daejeon, 34133, Republic of Korea.
在MoO2上的-纳米合金促进了离子交换膜水电解 (AEMWE) 以有效生产. 这种先进的催化剂优化了结合,性能优于金,并显示出AEMWE应用的巨大潜力.
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:
- 基于 (Ru) 的电催化剂对离子交换膜水电解 (AEMWE) 是有前途的,因为它们在演化反应 (HER) 中发挥了作用.
- 一个关键的挑战是Ru站点的强结合,这阻碍了溶解和水再吸附,限制了整体效率.
- 优化结强度对于提高HER在AEMWE中的性能至关重要.
研究的目的:
- 开发基于Ru的新型电催化剂,克服AEMWE中强结合的局限性.
- 为了研究将 (Ni) 纳入支持二氧化 (MoO2) 的Ru纳米合金中的作用,以改善HER活性.
- 为了评估AEMWE开发的RuNi/MoO2催化剂的性能.
主要方法:
- 在MoO2.2的支持下合成RuNi纳米合金.
- 利用理论模拟 (例如,DFT) 来了解结合机制和水解离障碍.
- 电化学表征包括超电位测量,周转频率,质量活动和价格活动评估.
- 在离子交换膜水电解电池中测试催化剂.
主要成果:
- RuNi/MoO2催化剂通过调节 Ru 位点与相邻的 Ni 原子,证明了优化结合强度.
- 在100 mA cm−2的51 mV的低超电位下,实现了优异的HER性能,并超过了商业Pt/C.
- 呈现出高周转频率 (7.06秒-1),质量活动 (13.4A毫克-1) 和价格活动 (1030.77A美元-1).
- 在AEMWE电池中,RuNi/MoO2阴极在1.7V (60°C,1米KOH) 时达到1Acm-2.
结论:
- 开发的RuNi/MoO2纳米合金催化剂有效地解决了基于Ru的HER电催化剂的结合限制.
- 对于AEMWE来说,催化剂表现出优越的电化学性能,包括高活性和效率.
- 在高效和成本效益的AEMWE应用中,RuNi/MoO2显示出极高质量活动的巨大潜力.
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