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Updated: Jun 3, 2025

Synthesis of Platinum-nickel Nanowires and Optimization for Oxygen Reduction Performance

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Published on: April 27, 2018

在压力诱导下,基催化剂的氧降解反应动力学

Haibo Jiang¹, Jiyuan Lu¹, Liyuan Bi¹

¹Shanghai Engineering Research Center of Hierarchical Nanomaterials, Key Laboratory for Ultrafine Materials of Ministry of Education, School of Materials Science and Engineering, East China University of Science & Technology, Shanghai 200237, China. jianhuashen@ecust.edu.cn.

Chemical communications (Cambridge, England)

|January 10, 2025

概括

压力诱导优化了 PtNi 和 PtPb 催化剂中的氧降解反应 (ORR) 动力学. 这种调整增强了PtNi催化剂活性3.57倍,而PtPb由于过度动力调制而降解.

科学领域:

电化学电化学电化学
材料科学材料科学材料科学
计算化学计算化学

背景情况:

优化氧降解反应 (ORR) 动力学对于在能量转换装置中使用的高效电催化剂至关重要.
基于的合金,如- (PtNi) 和- (PtPb),正在研究其ORR性能.
了解应激诱导在催化剂运动优化中的作用是一个活跃的研究领域.

研究的目的:

研究应力诱导对PtNi和PtPb催化剂ORR动力优化的影响.
阐明动力调节的机制及其对催化剂活性和稳定性的影响.
为了比较应力调节的PtNi和PtPb催化剂与商业Pt/C催化剂的性能.

主要方法:

使用第一原则计算来确定关键中间体*OOH的裂变屏障降低.
使用电化学表征技术来评估催化剂的活性和稳定性.
现场红外光谱学被用来验证在不同的动力调条件下确定速度的步骤.

主要成果:

应力诱导将*OOH中间裂变屏障降低到PtNi的28.48kJ mol-1和PtPb的0kJ mol-1.
优化的动力调促进了PtNi的质量活动,与Pt/C相比增加了3.57倍.
对PtPb的过度动态调制导致活动降解,并将速度决定的步骤转移到最初的电子转移.

结论:

压力诱导是基于Pt的催化剂中ORR动力优化的有效策略.
正确的动力调,如PtNi所示,显著增强了催化活性.
过度调整可能会导致有害影响,例如活动降解和反应机制的改变,正如在PtPb.中观察到的.

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