Dimetallic praseodymium-cobalt carbon nanotubes as highly efficient electrocatalyst for oxygen reduction reaction

IF 3.1 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY Carbon Trends Pub Date : 2024-04-04 DOI:10.1016/j.cartre.2024.100350

Huazhong Liang, Yu Dong, Qin Ding, Xiaoyu Li, Miao Yu, Peihe Li, Limei Duan, Yin Wang

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Abstract

In this study, six bimetallic rare earth (RE = La, Ce, Pr, Nd, Sm, Eu) cobalt nitrogen doped carbon nanotubes (RECo-NCNTs) were synthesized with g-C₃N₄ derivative method. These RECo-NCNTs were characterized by SEM, BET, XPS, XRD and Raman. In addition, their catalytic performances for oxygen reduction reaction (ORR) had also been tested. The introduction of rare earths did not destroy the structure of nanotubes but apparently change their ORR performances. The PrCo-NCNTs showed the significant improvement in catalytic ability for ORR (onset potential of 0.95 V and half-wave potential of 0.79 V), which is very close to that of commercial 20 % Pt/C. Moreover, PrCo-NCNTs exhibits an excellent catalytic stability (no activity decay after 10000st cycles) and an outstanding methanol toxic tolerance. Assembled in metal–air batteries (Zn-air, Al-air and Mg-air), the PrCo-NCNTs electrode also presents high power densities and discharge voltages.

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二金属镨钴碳纳米管作为氧气还原反应的高效电催化剂

本研究采用 g-C3N4 衍生方法合成了六种双金属稀土（RE = La、Ce、Pr、Nd、Sm、Eu）掺氮钴碳纳米管（RECo-NCNTs）。对这些 RECo-NCNTs 进行了 SEM、BET、XPS、XRD 和拉曼表征。此外，还测试了它们在氧还原反应（ORR）中的催化性能。稀土的引入没有破坏纳米管的结构，但明显改变了它们的 ORR 性能。PrCoNCNTs 的氧还原反应催化能力有了显著提高（起始电位为 0.95 V，半波电位为 0.79 V），非常接近 20% 的商用 Pt/C。此外，PrCo-NCNTs 还表现出卓越的催化稳定性（循环 10000 次后活性无衰减）和出色的甲醇耐毒性。在金属空气电池（锌-空气电池、铝-空气电池和镁-空气电池）中组装 PrCoNCNTs 电极，还可获得高功率密度和高放电电压。

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