Journal of Inorganic Materials, Volume. 38, Issue 5, 511(2023)
Figures & Tables(20)
1. Diagram of preparation process and chemical mechanisms of Pt100-x Irx alloy aerogels
3. (a) XRD patterns of different catalysts, commercial Pt/C, and (b) corresponding enlarged XRD patterns in the range of 2θ =35°-50°
4. (a) XPS survey spectrum of Pt80Ir20 aerogel, (b) Pt4f XPS spectra of various Pt-based catalysts, and (c) Ir4f XPS spectrum of Pt80Ir20 aerogel
5. (a) CV curves of Pt100-x Irx aerogels and commercial Pt/C catalysts under room temperature, (b) AOR activity comparison for Pt100-x Irx aerogels and commercial Pt/C catalysts at 0.5 V(vs. RHE), (c) energy difference between the highest occupied molecular orbital (HOMO) and the lowest unoccupied molecular orbital (LUMO) of Pt, Ir and Pt80Ir20 nanoparticles, (d) schematic diagram of electrocatalytic ammonia oxidation of Pt80Ir20 alloy nanoparticles and Pt80Ir20 alloy aerogel, (e) CV curves of the Pt80Ir20 catalyst in the presence and absence of NH3; (f) CA curves of Pt100-x Irx aerogels and commercial Pt/C catalysts
6. Electrochemical active areas of catalysts and AOR performance before and after 2000 CV cycles
S4. EDS spectrum of Pt80Ir20 aerogel catalyst with inset showing its mass and atom ratios
7. (a) CV curves of the Pt80Ir20 aerogel tested in different NH3 concentrations, (b) AOR activity comparison for Pt80Ir20 aerogel and commercial Pt/C in different NH3 concentrations at 0.5 V(vs. RHE), and (c, d) CA curves of the Pt80Ir20 aerogel (c) and commercial Pt/C (d) at 0.65 V(vs. RHE)
8. (a-c) CV curves of catalysts at different temperatures, (d) AOR activity comparison for commercial Pt/C, Pt aerogel and Pt80Ir20 aerogel catalysts at different temperatures at 0.5 V(vs. RHE), (e) CA curves of the Pt80Ir20 aerogel at different temperatures at 0.65 V (vs. RHE), (f) Arrhenius plots for NH3 oxidation on commercial Pt/C, Pt aerogel and Pt80Ir20 aerogel catalysts at 0.5 V(vs. RHE)
S6. Nyquist plots of EIS spectra measured for Pt (violet), Pt80Ir20 aerogel (blue) and commercial Pt/C (gray) in 1.0 mol/L KOH electrolyte at the open circuit potential
S7. XRD patterns of Pt80Ir20 aerogel before and after 2000 cycle stability tests
S9. CV curves of the commercial Pt/C in different NH3 concentrations
Table 1. Elemental quantification (%, in atom) determined by XPS for different Pt100-xIrx aerogel catalysts
View tableView in ArticleTable 1. Elemental quantification (%, in atom) determined by XPS for different Pt100-xIrx aerogel catalysts
Sample Pt/% Ir/% Pt/Ir Pt55Ir45 54.33 45.67 1.19 Pt70Ir30 67.24 32.76 2.05 Pt80Ir20 79.34 20.66 3.84 Pt87Ir13 88.36 11.64 7.59
Table 2. Comparison of binding energy between Pt4f with different Pt-based catalysts
View tableView in ArticleTable 2. Comparison of binding energy between Pt4f with different Pt-based catalysts
Sample Pt4f5/2/eV ∆1/eV Pt4f7/2/eV ∆2/eV Commercial Pt/C 75.10 - 71.70 - Pt87Ir13 aerogel 74.85 -0.25 71.53 -0.17 Pt80Ir20 aerogel 74.88 -0.22 71.50 -0.20 Pt70Ir30 aerogel 74.92 -0.18 71.53 -0.17 Pt55Ir45 aerogel 74.93 -0.17 71.57 -0.13
Table 3. Comparison of AOR activity between different catalysts
View tableView in ArticleTable 3. Comparison of AOR activity between different catalysts
Sample Onset potential/V Mass activity at 0.5 V (vs. RHE)/(mA·mgPGM-1) Peak mass activity/ (mA·mgPGM-1) Ref. Pt87Ir13 aerogel 0.411 4.7 53.7 This work Pt80Ir20 aerogel 0.368 19.4 86.3 This work Pt70Ir30 aerogel 0.361 8.9 31.5 This work Pt55Ir45 aerogel 0.358 6.4 24.8 This work Pt 0.511 1.1 31.5 This work Ir 0.354 12.0 14.6 This work Commercial Pt/C 0.495 8.4 62.9 This work Commercial PtIr/C 0.428 10.4 25.1 [S1] Ir-decorate Pt NCs/C ~ 0.43 - 100 [S2] Polycrystalline PtIr ~ 0.41 - - [S3] PtRh/C(Pt:Rh = 9:1) 0.44 9.0 93.8 [S4] Pt-decorated Ni particles ~0.50 - 75.3 [S5]
Tools
Get Citation
Copy Citation Text
Xiangsong ZHANG, Yetong LIU, Yongying WANG, Zirui WU, Zhenzhong LIU, Yi LI, Juan YANG.
Paper Information
Category:
Received: Nov. 16, 2022
Accepted: --
Published Online: Oct. 17, 2023
The Author Email: LI Yi (liyi5482@ujs.edu.cn), YANG Juan (yangjuan6347@ujs.edu.cn)
© Copyright 2018-2021 | Chinese Laser Press.
All Rights Reserved 沪ICP备15018463号-20