Key Laboratory for Green Processing of Chemical Engineering of Xinjiang Bingtuan, State Key Laboratory Cultivation Base Jointly Constructed by Province and The Ministry, Key Laboratory of Materials-Oriented Chemical Engineering of Xinjiang Uygur Autonomous Region, College of Chemistry and Chemical Engineering, Shihezi University, Shihezi, 832000, China.
Sci Rep. 2018 Jan 29;8(1):1802. doi: 10.1038/s41598-018-19347-5.
Coral reef has a unique dendritic structure with large specific surface area, rich pore structure, so that it can be attached to a large number of zooxanthellae for gas exchange. Coral reef ecosystems are also known as underwater rainforests. Inspired by this biological structure, we designed and fabricated coral-like CoO decorated N-doped carbon particles (CoO/N-CP). The obtained CoO/N-CP-900 catalyst shows efficient ORR electrocatalytic performances in an alkaline medium with a positive onset and half-wave potentials of 0.97 and 0.90 V (vs. RHE), as well as a high diffusion-limited current density (5.50 mA cm) comparable to that of a Pt/C catalyst (5.15 mA cm). It also displays better stability and methanol tolerance than commercial Pt/C. In addition, the CoO/N-CP-900 electrode has a high specific capacitance of 316.2 F g in 6 M KOH, as well as good rate capabilities and excellent cycle performance. These results are due to large surface area, narrow pore size distribution, high density electrochemical energy conversion and storage activity centers. This method presented here offers an effective path for the development of high performance multi-functional carbon-based materials for ORR and supercapacitor applications.
珊瑚礁具有独特的树枝状结构，比表面积大，孔结构丰富，因此可以附着大量的虫黄藻进行气体交换。珊瑚礁生态系统也被称为水下热带雨林。受此生物结构的启发，我们设计并制造了珊瑚状 CoO 修饰的 N 掺杂碳颗粒（CoO/N-CP）。所获得的 CoO/N-CP-900 催化剂在碱性介质中具有高效的 ORR 电催化性能，其正向起始电位和半波电位分别为 0.97 和 0.90 V（相对于 RHE），以及与商业 Pt/C 催化剂相当的高扩散限制电流密度（5.50 mA cm）（5.15 mA cm）。它还表现出比商用 Pt/C 更好的稳定性和甲醇耐受性。此外，CoO/N-CP-900 电极在 6 M KOH 中具有 316.2 F g 的高比电容，以及良好的倍率性能和优异的循环性能。这些结果归因于大的比表面积、窄的孔径分布、高密度的电化学能量转换和存储活性中心。本文提出的方法为开发用于 ORR 和超级电容器应用的高性能多功能碳基材料提供了一条有效途径。
