Synthesization, characterization, and highly efficient electrocatalysis of chain-like Pt-Ni nanoparticles

Xu Ke-Xin; Xia Tian-Yu; Zhou Liang; Li Shun-Fang; Cai Bin; Wang Rong-Ming; Guo Hai-Zhong

doi:10.7498/aps.69.20200343

Abstract

Fuel cells are one of the promising energy-conversion devices due to their high efficiency and zero emission. Despite tremendous research works in past decades, there remains a tough challenge in realizing the commercial applications of fuel cell technologies. Therefore, the development of highly efficient and stable fuel cell electrocatalyst is the top priority for practical fuel cells. As we all know, the small-size nanoparticles always have high specific surface area, which can provide more active sites to enhance the catalytic activity, while the one-dimensional nanowires usually own high structural stability. It may provide a possibility for the design of a novel bimetal Pt-based alloy nanostructure by combining the structural superiority of both, which can maintain the high stability and maximize the catalytic activity at the same time. Driven by these purposes, a novel nanostructure constructed by Pt-Ni alloy nanoparticles with a one-dimensional chain structure was designed to balance the contradiction between the activity and stability due to the size effects (the smaller the size, the higher the activity, and the worse the stability of the nanocatalyst; and vice versa). Here, a simple one-step solvothermal method has been adopted to produce the novel nanostructures constructed by the chain-like Pt-Ni nanoparticles (Pt-Ni CNPs) with Pt-rich crystal faces and alloy nature. The structure, component and catalysis were investigated by the combination of X-ray diffraction, transmission electron microscopy, X-ray photoemission spectra, and electrochemical measurements. The results show that the as-synthesized Pt-Ni CNP is constructed from a nanowire (with a diameter of about 3 nm and a length of several hundred nanometers) and the nanoparticles (with an average diameter of about 10 nm). This nanostructure is cleverly integrated the structural advantages of one-dimensional nanowires and zero-dimensional nanoparticles, which can significantly enhance the catalytic activity and stability for the methanol oxidation reaction (MOR) in acidic environment. Specially, the mass activity and specific activity of as-prepared Pt-Ni CNPs are 5.7 and 7.6 times higher than those of the commercial Pt/C, respectively. After 1000 cycles of cyclic voltammetry (CV) measurement, Pt-Ni CNPs still retain 91.2% of the specific activity, while the commercial Pt/C undergoes a drastic loss of MOR activities, retaining only 4.4% of the initial activity. It is particularly noteworthy that this nanostructure of Pt-Ni CNP solves the problem of agglomeration of nanoparticle catalysts in the reaction, and provides a new approach to obtain Pt-based nanocatalysts with high catalytic activity and stability at the same time. Our finding will provide insight into more rational designs of Pt-based bimetallic nanocatalysts with one-dimensional architectures, which is expected to promote the further development and large-scale industrial application of the direct methanol fuel.

Keywords:

chain-like PtNi nanoparticles /
one-dimensional assembly nanostructure /
direct methanol fuel

Authors and contacts

1.
School of Physics and Microelectronics, Zhengzhou University, Zhengzhou 450052, China
2.
Beijing Advanced Innovation Center for Materials Genome Engineering, Beijing Key Laboratory for Magneto-Photoelectrical Composite and Interface Science, School of Mathematics and Physics, University of Science and Technology Beijing, Beijing 100083, China
3.
Collaborative Innovation Center of Light Manipulations and Applications, Shandong Normal University, Jinan 250358, China

Corresponding author: Xia Tian-Yu, tyxia@zzu.edu.cn ; Guo Hai-Zhong, hguo@zzu.edu.cn

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References

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Cited By

图 1 (a) Pt-Ni CNPs的TEM图像, 插图是纳米颗粒的直径分布统计图; (b) 高放大倍数下单根Pt-Ni CNPs的TEM图像; (c) Pt-Ni CNPs的HAADF-STEM图像; (d)和(e)分别为(c)中Pt和Ni的EDS元素分布

Figure 1. (a) TEM image of Pt-Ni CNPs. Inset: graph of the diameter distribution of nanoparticles; (b) TEM image of a single Pt-Ni CNPs at a higher magnification; (c) HAADF-STEM images of Pt-Ni CNPs; (d) and (e) are EDS element distribution images of Pt and Ni in Pt-Ni CNPs corresponding to (c), respectively.

DownLoad: Full-Size Img PowerPoint

图 2 (a) Pt-Ni CNPs的 XRD 谱图及Pt 和 Ni 的标准卡片峰(分别对应红色和蓝色); (b) Pt-Ni CNPs的 EDS能谱图; (c)和(d)为Pt-Ni CNPs的XPS谱图, 分别对应Pt的4f峰和Ni的2p峰

Figure 2. (a) XRD patterns of Pt-Ni CNPs and standard card peaks of Pt and Ni (corresponding to red and blue respectively); (b) EDS spectrum of Pt-Ni CNPs; (c) and (d) are XPS spectra of Pt-Ni CNPs, corresponding to the 4f peak of Pt and the 2p peak of Ni, respectively.

DownLoad: Full-Size Img PowerPoint

图 3 Pt-Ni CNPs (红色) 和商业Pt/C (黑色) 的MOR性能对比 (a), (b)两种催化剂的CV曲线, 分别是ECSA和MOR; (c) 两种样品相对应的质量活性和比活性; (d) 以5 mV/s的扫描速率测得的LSV曲线, 插图是固定电流密度所需提供的电位值

Figure 3. MOR performance comparison for Pt-Ni CNPs (red) and commercial Pt/C (black): (a) CV of the above catalysts for ECSAs; (b) CV of the above catalysts for MOR; (c) corresponding mass and specific activities of different catalysts for MOR; (d) LSV curves of the above electrocatalysts with a low scan rate of 5 mV/s. Inset:the potential required for fixed current density.

DownLoad: Full-Size Img PowerPoint

图 4 (a) CO溶解曲线; (b)和(c)分别为Pt-Ni CNPs (红色)和商业Pt/C (黑色)在0.5 M H₂SO₄和1 M CH₃OH混合溶液中的稳定性测试: 实线为第一圈CV循环曲线, 虚线为第1000圈CV循环曲线; (d) 两种样品1000圈CV循环前后比活性对比

Figure 4. (a) The electrode area-normalized CO stripping curves; Stability test in 0.5 M H₂SO₄ and 1 M CH₃OH solutions: (b) Pt-Ni CNPs (red) and (c) commercial Pt/C (black) with solid line as the first cycle and dashed line as the 1000th cycle; (d) specific activities of two samples before and after 1000 cycles.

DownLoad: Full-Size Img PowerPoint

map

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[2]	Yan Z X, Xie J M, Shen P K 2015 J. Power Sources 286 239 Google Scholar
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[5]	Vandichel M, Moscu A, Grönbeck H 2017 ACS Catal. 7 7431 Google Scholar
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[9]	Chen C, Kang Y J, Huo Z Y, Zhu Z W, Huang W Y, Xin H L L, Snyder J D, Li D G, Herron J A, Mavrikakis M 2014 Science 343 1339 Google Scholar
[10]	Greeley J, Stephens I E L, Bondarenko A S, Johansson T P, Hansen H A, Jaramillo T F, Rossmeisl J, Chorkendorff I, Nørskov J K 2009 Nat. Chem. 1 552 Google Scholar
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[47]	Lai S Q, Fu C L, Chen Y X, Yu X, Lai X D, Ye C, Hu J Q 2015 J. Power Sources 274 604 Google Scholar
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Vol. 69, Issue 7 - 2020-04-05

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