The influence of the surface modification of multi-walled carbon nanotubes (MWCNT) with nitrogen-containing compounds on the performance of 40 wt% Pt/MWCNT catalysts in the oxygen electroreduction reaction (ORR) was investigated using a rotating disk electrode (RDE) at 10–35 °C in 0.1 M HClO₄ as electrolyte in electrochemical cell, and in a hydrogen–oxygen polymer electrolyte membrane fuel cell (PEMFC) at 82 °C. The catalysts were characterized by low-temperature nitrogen adsorption, XPS, TEM, gas-phase CO titration, electrooxidation of the adsorbed CO monolayer, and cyclic voltammetry. It was shown that the modification of MWCNT with melamine–formaldehyde resin leads to the surface nitrogen concentration up to 8.3 at.% (CNT-MF sample). The 40 wt% Pt/CNT-MF catalyst with 0.1 mg cm⁻² Pt loading on the cathode showed a good performance in PEMFC (~ 0.61 W cm⁻²) and a high utilization ratio (0.84) of Pt in membrane electrode assembly as compared to Pt/CNT catalyst (~ 0.37 W cm⁻² and utilization of 0.29). The higher power density of nitrogen-modified catalysts was ascribed to a higher utilization of Pt in the electrode layer.

中文翻译：

---

含氮聚合物修饰多壁碳纳米管对PEMFC中Pt / CNT催化剂电化学性能的影响

使用旋转盘电极（RDE）研究了用含氮化合物对多壁碳纳米管（MWCNT）进行表面改性对40wt％Pt / MWCNT催化剂在氧还原反应（ORR）中的性能的影响。在0.1 M HClO _4中作为电解质在10–35°C下作为电化学电池，在氢氧聚合物电解质膜燃料电池（PEMFC）中在82°C下作为电解质。通过低温氮吸附，XPS，TEM，气相CO滴定，吸附的CO单层的电氧化和循环伏安法对催化剂进行了表征。结果表明，三聚氰胺-甲醛树脂对MWCNT的改性导致表面氮浓度高达8.3 at。％（CNT-MF样品）。具有0.1 mg cm ^-2的40 wt％Pt / CNT-MF催化剂与Pt / CNT催化剂（〜0.37 W cm ^-2和Pt / CNT催化剂的利用率）相比，阴极上的Pt负载在PEMFC中表现出良好的性能（〜0.61 W cm ^-2），膜电极组件中Pt的利用率高（0.84）。 0.29）。氮改性催化剂的较高功率密度归因于电极层中Pt的较高利用率。