基于淀粉的多孔碳微球复合 NiCoO 纳米花作为锌空气电池的双功能电催化剂。
Starch-based porous carbon microsphere composited NiCoO nanoflower as bifunctional electrocatalyst for zinc-air battery.
机构信息
State Key Laboratory of Chemistry and Utilization of Carbon Based Energy Resources, College of Chemistry, Xinjiang University, Urumqi 830046, Xinjiang, PR China.
State Key Laboratory of Chemistry and Utilization of Carbon Based Energy Resources, College of Chemistry, Xinjiang University, Urumqi 830046, Xinjiang, PR China; Physics and Chemistry Analysis Center, Xinjiang University, Urumqi 830046, China.
出版信息
Int J Biol Macromol. 2023 Jun 30;241:124604. doi: 10.1016/j.ijbiomac.2023.124604. Epub 2023 Apr 26.
It is significant to explore and design outstanding bifunctional oxygen electrocatalysts to promote the oxygen evolution reaction (OER) and oxygen reduction reaction (ORR) in zinc-air batteries. Herein, a novel porous carbon microspheres (CMS) modified by NiCoO nanoflower (CMS-NiCoO) have been prepared as an ORR and OER catalyst. The hierarchical porous structure of CMS provides high conductivity and abundant active sites for ORR, whereas the synergistic effect of NiCoO nanosheets and a small amount of FeZn oxides act as the positive phase for OER. The efficient oxygen catalytic activity is gained by creating a coupling interface between NiCoO and CMS. The optimized CMS-NiCoO shows a half-wave potential of 0.82 V toward ORR and an overpotential of 392 mV toward OER. Particularly, CMS-NiCoO also exhibits an excellent peak power density (175.5 mW cm) as a catalyst for zinc-air batteries, which is superior to the commercial Pt/C + RuO catalyst (120.5 mW cm), and it also demonstrates a remarkable stability even after the charge-discharge cycles of 167 h. The prepared CMS-NiCoO is promising for the application of the bimetallic oxide catalyst for zinc-air battery.
探索和设计优秀的双功能氧电催化剂对于促进锌空电池中的氧气析出反应（OER）和氧气还原反应（ORR）具有重要意义。在此，我们制备了一种新型的多孔碳微球（CMS）修饰的 NiCoO 纳米花（CMS-NiCoO），用作 ORR 和 OER 催化剂。CMS 的分级多孔结构为 ORR 提供了高导电性和丰富的活性位点，而 NiCoO 纳米片和少量 FeZn 氧化物的协同作用则作为 OER 的正相。通过在 NiCoO 和 CMS 之间创建耦合界面，可以获得高效的氧气催化活性。优化后的 CMS-NiCoO 在 ORR 中表现出 0.82 V 的半波电位，在 OER 中表现出 392 mV 的过电势。特别地，CMS-NiCoO 作为锌空电池的催化剂，还表现出优异的峰值功率密度（175.5 mW cm），优于商业 Pt/C + RuO 催化剂（120.5 mW cm），并且在 167 小时的充放电循环后仍表现出显著的稳定性。所制备的 CMS-NiCoO 有望应用于双金属氧化物催化剂用于锌空电池。
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