Pt2NiCo金属间化合物的有序度调控及电催化氧还原反应性能研究

doi:10.61558/2993-074X.3519

摘要/Abstract

摘要：

开发高效、稳定的氧还原反应电催化剂对于质子交换膜燃料电池的大规模应用具有重要的促进作用。合金化是目前广泛采用的Pt基催化剂优化策略之一，然而，传统Pt基无序合金催化剂活性目前依然无法满足燃料电池设备的要求。此外，过渡金属容易在酸性体系中发生腐蚀溶解，造成催化剂活性的迅速衰减，从而导致设备的整体稳定性较差。相比之下，金属间化合物因其原子有序排列可以提供独特的电子效应、几何效应及更强的金属间相互作用，实现催化活性与稳定性双重提升的目标。本文报道了一种L1₀型Pt₂NiCo三元有序金属间化合物纳米催化剂（o-Pt₂NiCo），相较于Pt₂NiCo无序合金和Pt/C，其催化活性与稳定性均有显著增加。通过进一步改变退火条件对Pt₂NiCo的有序度进行调控，并探究了ORR性能与有序度之间的关系。实验结果表明，当退火温度为800 °C，退火时间为2 h时，Pt₂NiCo有序度达到最高值35.9%，且有序度与催化活性呈正相关。对于电催化ORR反应，o-Pt₂NiCo在0.9 V电位下的质量活性能够达到0.44·mg_Pt⁻¹，分别是无序Pt₂NiCo合金（d-Pt₂NiCo）和Pt/C的1.8倍与2.8倍。同时，o-Pt₂NiCo的催化稳定性也得到了大幅度提升，在30000圈电位循环后质量活性保持率依然能够达到70.8%，远超d-Pt₂NiCo和Pt/C。

关键词: 燃料电池, 氧还原反应, 电催化, 金属间化合物, 有序度

Abstract:

Alloying transition metals with Pt is an effective strategy for optimizing Pt-based catalysts toward the oxygen reduction reaction (ORR). Atomic ordered intermetallic compounds (IMC) provide unique electronic and geometrical effects as well as stronger intermetallic interactions due to the ordered arrangement of metal atoms, thus exhibiting superior electrocatalytic activity and durability. However, quantitatively analyzing the ordering degree of IMC and exploring the correlation between the ordering degree and ORR activity remains extremely challenging. Herein, a series of ternary Pt₂NiCo intermetallic catalysts (o-Pt₂NiCo) with different ordering degree were synthesized by annealing temperature modulation. Among them, the o-Pt₂NiCo which annealed at 800 °C for two hours exhibits the highest ordering degree and the optimal ORR activity, which the mass activity of o-Pt₂NiCo is 1.8 times and 2.8 times higher than that of disordered Pt₂NiCo alloy and Pt/C. Furthermore, the o-Pt₂NiCo still maintains 70.8% mass activity after 30,000 potential cycles. Additionally, the ORR activity test results for Pt₂NiCo IMC with different ordering degree also provide a positive correlation between the ordering degree and ORR activity. This work provides a prospective design direction for ternary Pt-based electrocatalysts.

Key words: Fuel cell, Oxygen reduction reaction, Electrocatalysis, Intermetallic compound, Ordering degree

张辰浩, 胡晗宇, 杨竣皓, 张倩, 杨畅, 王得丽. Pt₂NiCo金属间化合物的有序度调控及电催化氧还原反应性能研究[J]. 电化学（中英文）, 2025, 31(4): 2411281.

Zhang Chen-Hao, Hu Han-Yu, Yang Jun-Hao, Zhang Qian, Yang Chang, Wang De-Li. Ordering Degree Regulation of Pt₂NiCo Intermetallics for Efficient Oxygen Reduction Reaction[J]. Journal of Electrochemistry, 2025, 31(4): 2411281.

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链接本文: https://electrochem.xmu.edu.cn/CN/10.61558/2993-074X.3519

https://electrochem.xmu.edu.cn/CN/Y2025/V31/I4/2411281

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Pt₂NiCo金属间化合物的有序度调控及电催化氧还原反应性能研究

Ordering Degree Regulation of Pt₂NiCo Intermetallics for Efficient Oxygen Reduction Reaction

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