Effective oxygen reduction reaction and suppression of CO poisoning on Pt3Ni1/N-rGO electrocatalyst

• Published in: Applied surface science 2022-10, Vol.600, p.154048, Article 154048
• Main Authors: Lee, Junhee, Son, Namgyu, Park, Byung Hyun, Kim, Sujeong, Bae, Dasol, Kim, Minkyu, Joo, Sang Woo, Kang, Misook
• Format: Article
• Language: English
• Subjects: CO poisoning resistance; Long-term durability; Oxygen reduction reaction; Pt-Ni-NC electron-rich interface; Pt3Ni1/N-rGO
• ISSN: 0169-4332; 1873-5584
• DOI: 10.1016/j.apsusc.2022.154048

[Display omitted] •N-rGO surface loaded with uniform Pt3Ni1 particles below 5.0 nm.•ESCA and LSV polarization curves unchanged after 5000 CV tests.•Increased O2 adsorption at the electron-rich Pt-Ni-NC three-phase interface.•Pt3Ni1/N-rGO electrodes with breakthrough CO poisoning resistance. The development of high-performance ORR catalysts that satisfy the requirements of low Pt content, high activity, and long-term durability is crucial. The adequately designed Pt3Ni1/N-rGO electrode, which was obtained by the regular dispersion and growth of uniform ≤ 5.0-nm-sized Pt3Ni1 alloy nanoparticles on an N-rGO support electrode by the solvothermal method, exhibited improved mass activity and specific surface activity (178% and 167%, respectively) compared to that of a commercial Pt/C electrode. The fabricated electrode showed almost unchanged ESCA and LSV polarization curves even after 5000 cyclic voltammetry tests. The Pt3Ni1/N-rGO electrode exhibited remarkable resistance to CO poisoning compared to that of the commercial Pt/C electrode. An electron-rich Pt–Ni–NC three-phase interface was created in the catalyst by introducing CN, which is more electron-rich than CC, to the rGO support, which increased its O2 gas-adsorption properties and provided adequate strength for OH group formation that eventually accelerated their conversion into H2O.