School of Materials Science and Engineering, Hebei University of Technology, Tianjin 300130, China.
School of Materials Science and Engineering, Hebei University of Technology, Tianjin 300130, China.
J Colloid Interface Sci. 2023 Sep;645:618-626. doi: 10.1016/j.jcis.2023.04.106. Epub 2023 Apr 29.
The design of high-performance oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) dual-functional catalysts is not only important for the further applications of zinc-air batteries (ZABs) but also a major challenge in the field of energy conversion. The cheap 1,2,4-triazole (1,2,4-TZ) can be decomposed easily by heat, making it a high research value in carbon catalysts derived from metal-organic frameworks (MOFs). Here, CoN particles encapsulated at the top of N-doped carbon nanotubes (CoN@NCNTs) were conveniently prepared by 1,2,4-TZ-assisted pyrolysis of Co-MOF-74 for the first time. Owing to the excellent activity of CoN particles and the highly graphitized N-doped carbon nanotubes (NCNTs), CoN@NCNTs obtained at 900 °C (CoN@NCNT-900) exhibited astonishing catalytic performance in both ORR and OER, and high reversible oxygen bifunctional activity (ΔE = 0.685 V). Moreover, CoN@NCNT-900 displayed a larger discharge power density (122 mW cm), a better specific capacity (811.8 mAh g), and more excellent durability during the ZAB test, implying that CoN@NCNT-900 can act as a bifunctional high active catalyst in ZABs.
设计高性能氧还原反应(ORR)和氧析出反应(OER)双功能催化剂不仅对锌空气电池(ZAB)的进一步应用很重要,而且也是能量转换领域的主要挑战。廉价的 1,2,4-三氮唑(1,2,4-TZ)很容易通过热分解,使其在金属有机骨架(MOFs)衍生的碳催化剂中具有很高的研究价值。在此,首次通过 1,2,4-TZ 辅助热解 Co-MOF-74 方便地制备了顶部包裹 CoN 颗粒的氮掺杂碳纳米管(CoN@NCNTs)。由于 CoN 颗粒的优异活性和高度石墨化的氮掺杂碳纳米管(NCNTs),在 900°C 下获得的 CoN@NCNTs(CoN@NCNT-900)在 ORR 和 OER 中均表现出惊人的催化性能,并且具有高可逆氧气双功能活性(ΔE = 0.685 V)。此外,在 ZAB 测试中,CoN@NCNT-900 表现出更大的放电功率密度(122 mW cm)、更好的比容量(811.8 mAh g)和更优异的耐久性,表明 CoN@NCNT-900 可用作 ZAB 中的双功能高活性催化剂。