High-Performance Intermetallic Pt3Co/C Electrocatalyst for the Oxygen Reduction Reaction Synthesized by Pre-Lithiation Method.

IF 3 4区 化学 Q2 CHEMISTRY, MULTIDISCIPLINARY
Zheng Ying Zhang, Dong Fang, Liyang Li, Hua Yang, Jian Liu, Feng Liu, Yong Gao, Olim Ruzimuradov
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引用次数: 0

Abstract

Fuel cells are recognized as promising alternatives to existing conventional energy systems for a sustainable future. However, the synthesis of efficient and robust platinum (Pt) based catalysts remains a challenge for practical fuel cell applications. Herein, the Pt3Co/C nanoparticles with about 4.45 nm are firstly prepared by a pre-lithiation-deposition strategy on C carrier and used as efficient electrocatalysts for cathodic oxygen reduction reaction. Notably, after heat treatment at 600 ℃, the obtained Pt3Co/C-600 catalyst shows excellent mass and specific activities (MA and SA) of 0.69 A mgPt-1 and 1.01 mA cmPt-2, respectively, which are more than one order of magnitude higher than that of Pt/C-600. In particular, after accelerated durability testing with 20k cycles, the durability of the Pt3Co/C-600 catalyst (98.3% retention of MA) is much higher than that of Pt3Co/C-600 without pre-lithiation (42.5% retention of MA). The alloying of Pt and Co and the use of pre-lithiation to enable strong interactions between the carbon carriers and the Pt-Co nanoparticles contributed to the increased activity and excellent stability. This work provides a new perspective for the development of high-performance and low-cost Pt alloy electrocatalysts.

用预石灰化方法合成的用于氧还原反应的高性能金属间 Pt3Co/C 电催化剂。
燃料电池被认为是替代现有传统能源系统、实现未来可持续发展的前景广阔的替代品。然而,在燃料电池的实际应用中,合成高效、坚固的铂(Pt)基催化剂仍是一项挑战。本文首先在 C 载体上采用预硫化沉积策略制备了约 4.45 nm 的 Pt3Co/C 纳米粒子,并将其用作阴极氧还原反应的高效电催化剂。值得注意的是,经过 600 ℃ 热处理后,得到的 Pt3Co/C-600 催化剂显示出优异的质量活性和比活性(MA 和 SA),分别为 0.69 A mgPt-1 和 1.01 mA cmPt-2,比 Pt/C-600 高出一个数量级以上。特别是在经过 20k 周期的加速耐久性测试后,Pt3Co/C-600 催化剂的耐久性(MA 保留率 98.3%)远高于未预镀层的 Pt3Co/C-600(MA 保留率 42.5%)。铂和钴的合金化以及使用预石灰化使碳载体和铂钴纳米颗粒之间产生强烈的相互作用,有助于提高催化剂的活性和出色的稳定性。这项研究为开发高性能、低成本的铂合金电催化剂提供了新的视角。
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来源期刊
ChemPlusChem
ChemPlusChem CHEMISTRY, MULTIDISCIPLINARY-
CiteScore
5.90
自引率
0.00%
发文量
200
审稿时长
1 months
期刊介绍: ChemPlusChem is a peer-reviewed, general chemistry journal that brings readers the very best in multidisciplinary research centering on chemistry. It is published on behalf of Chemistry Europe, an association of 16 European chemical societies. Fully comprehensive in its scope, ChemPlusChem publishes articles covering new results from at least two different aspects (subfields) of chemistry or one of chemistry and one of another scientific discipline (one chemistry topic plus another one, hence the title ChemPlusChem). All suitable submissions undergo balanced peer review by experts in the field to ensure the highest quality, originality, relevance, significance, and validity.
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