Carbon Dots Boost the Electrocatalytic Ammonia Oxidation Reaction on Pt2Pd Nanosheet

IF 2.6 4区 材料科学 Q2 CHEMISTRY, MULTIDISCIPLINARY
ChemNanoMat Pub Date : 2024-11-03 DOI:10.1002/cnma.202400495
Jinzeng Guo, Penghao Li, Jinxin Chen, Wenxiang Zhu, Mengjie Ma, Dongdong Gao, Pengcheng Qiu, Prof. Qi Shao, Dr. Fan Liao, Prof. Mingwang Shao
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引用次数: 0

Abstract

The development of efficient catalysts for high-performance ammonia oxidation reaction (AOR) is crucial for direct ammonia fuel cells. However, AOR is severely affected by slow kinetics and the toxicity of reaction intermediates, which reduce the durability of precious metal catalysts. Here, a two-dimensional carbon dots modified Pt2Pd nanoporous alloy (Pt2Pd-CDs) is synthesized through the borane morpholine reduction of a platinum palladium oxide nanosheet. The Pt2Pd_3 % CDs (the mass of CDs is 3 % of Pt2Pd) exhibits high AOR activity and stability in alkaline media, with an onset potential of 0.41 V vs. RHE, which is 170 mV lower than that of the commercial Pt/C (0.58 V vs. RHE). In addition, after 2000 cycles of accelerated durability testing, the peak mass activity (115.3 A gPGM−1) decreases by only 25.8 %. This enhancement is mainly attributed to the unique advantage of two-dimensional nanoporous structure with a high electrochemical surface area, and the strong ammonia adsorption and the electron deliver capacity of CDs.

碳点促进Pt2Pd纳米片上电催化氨氧化反应
高效氨氧化反应催化剂的开发对直接氨燃料电池的发展至关重要。然而,AOR受到反应动力学缓慢和反应中间体毒性的严重影响,从而降低了贵金属催化剂的耐久性。本文通过硼烷啉还原氧化铂钯纳米片,合成了二维碳点修饰的Pt2Pd纳米多孔合金(Pt2Pd- cds)。Pt2Pd_3 % cd (cd质量为Pt2Pd的3%)在碱性介质中表现出较高的AOR活性和稳定性,相对于RHE的起始电位为0.41 V,比商用Pt/C的起始电位(0.58 V)低170 mV。此外,经过2000次加速耐久性试验后,峰值质量活度(115.3 A gPGM−1)仅下降了25.8%。这种增强主要归功于二维纳米孔结构具有较高的电化学表面积的独特优势,以及CDs的强氨吸附和电子传递能力。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
ChemNanoMat
ChemNanoMat Energy-Energy Engineering and Power Technology
CiteScore
6.10
自引率
2.60%
发文量
236
期刊介绍: ChemNanoMat is a new journal published in close cooperation with the teams of Angewandte Chemie and Advanced Materials, and is the new sister journal to Chemistry—An Asian Journal.
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