*近，宁波中科科创新能源科技有限公司联合中国科学院上海高等研究院杨辉研究员团队开发了一种N掺杂的具有极高氧还原稳定性的Pt/C催化剂。通过液相法制备的催化剂展现出能与商业化Pt催化剂相媲美的活性以及极其优异的稳定性。经过20,000次加速循环耐久性测试（ADT），质量比活性衰减仅为3.7%，远低于商用铂碳催化剂。特别值得注意的是，该方法步骤简单，没有使用表面活性剂，在论文中已经实现催化剂单批次百克级制备，*近公司已能实现公斤级制备，并且Pt的载量可从10~100wt.%。因此，这种具有前景的制备策略为经济**地生产Pt基催化剂提供了巨大潜力，并为规模应用打开了一扇窗。相关论文发表在Journal of Catalysis 杂志上。
Fig. 1. Schematic illustration of the synthetic strategy of N-doped Pt/C catalysts.
Fig. 2. (a) XPS spectra for N 1s in N-doped Pt NPs/C. (b) XPS spectra for Pt 4f in N-doped Pt NPs/C and N-doped Pt NPs/C-H2. (c) XRD diffraction patterns of different catalysts. (d) Enlarged region of the (111) diffraction peaks of Fig. 2c. (e) Pt L3-edge XANES for all the samples. (f) The k3-weighted R-space Fourier-transform EXAFS spectra of different catalysts and reference samples.
Fig. 3. (a) High resolution HAADF-STEM image of N-doped Pt NPs. (b) HAADF-STEM image of one N-doped Pt NP. (c) N element K-edge EELS spectrum of the N-doped Pt NP in Fig. 3b. (d) The integrated pixel intensity taken along the Pt (111) spacing direction marked by purple square in Fig. 3b. Inset of Fig. 3d is FFT pattern from the purple square at the Pt NP shown in Fig. 3b.
Fig. 4. (a) CVs of different catalysts in 0.1 M HClO4 solution at a scan rate of 50 mV∙s-1. (b) ORR polarization curves on different catalysts in O2-saturated 0.1M HClO4 with a scan rate of 10 mV∙s-1 and rotation speed of 1,600 rpm. (c-d) ORR polarization curves on different catalysts before and after 20,000 ADT cycles between 0.6 and 1.1 V/ RHE. (e) The changes in ECSAs of the different catalysts before and after 20,000 cycles. (f) The changes in mass activities of the different catalysts before and after 20,000 cycles. (g) Single cell performance of H2-air fuel cells prepared with N-doped Pt/C and commercial JM Pt/C. (Pt loading: anode-0.1 mg·cm-2; cathode-0.3 mg·cm-2. Testing condition: 80 oC, 100 RH%, back-pressure=1 atm.)
Fig. 5. (a) Pure Pt NP and (b) N-doped Pt NP. The grey and red balls stand for the Pt and N atoms, respectively. (c) The tensile strain of Pt NP as a function of the number of N atoms embedded into the NP. (d) Atom removal energy of pure Pt NP and N-doped Pt NP at different atom positions (a, b, c and d represent the Pt atom position sites shown in Fig. S25). (e) Reaction free energy diagram of the ORR for two different reactive sites on N-doped Pt NPs.
Fig. 5. The scene photograph of synthesizing the N-doped Pt NPs in a large-scale.
原文： N-doping induced tensile-strained Pt nanoparticles ensuring an excellent durability of the oxygen reduction reaction Yunjie Xiong, Yunan Ma, Liangliang Zou, Shaobo Han, Hong Chen, Shuai Wang, Meng Gu, Yang Shen, Lipeng Zhang, Zhenhai Xia, Jun Li and Hui Yang Journal of Catalysis, 2020, 382: 247-255 DOI: 10.1016/j.jcat.2019.12.025