Key Laboratory of Jiangsu Province for Chemical Pollution Control and Resources Reuse School of Environment and Biological Engineering, Nanjing University of Science and Technology , Nanjing 210094, China.
ACS Appl Mater Interfaces. 2017 Sep 27;9(38):32737-32744. doi: 10.1021/acsami.7b09707. Epub 2017 Sep 18.
The activity and stability of electrocatalyst for oxygen reduction reaction (ORR) essentially depends on its structural and compositional properties. Herein, we report the facile preparation of nitrogen-doped graphitic carbon (NGC) via the pyrolysis of deep-eutectic solvents (DESs) as a superior electrocatalyst for ORR. The resulting NGCs possess high surface areas, rich nitrogen content, and favorable graphitization degree, all of which are highly desired for the ORR catalysts. The effects of the pyrolysis temperature on the ORR performance of the final products are explored. The results implied that the material fabricated at 900 °C (NGC900) is identified as the best ORR catalyst in the series of samples. Specifically, NGC900 shows efficient performance toward ORR with an onset potential of 0.97 V and a half potential of 0.84 V, which bears comparison with the commercial Pt/C catalyst with enhanced stability in the alkaline media. The superior ORR performance of NGC900 may be ascribed to the balance between the surface area, pyridinic nitrogen, and defect of NGCs. The rational design of NGCs with an efficient ORR activity and stability based on the low-cost DESs implies adequate support for the development of energy devices in practical application.
电催化剂的氧还原反应（ORR）活性和稳定性主要取决于其结构和组成特性。在此，我们报告了一种通过深共熔溶剂（DESs）热解制备氮掺杂石墨碳（NGC）的简便方法，该方法可作为 ORR 的优异电催化剂。所得的 NGC 具有高比表面积、丰富的氮含量和良好的石墨化程度，这些都是 ORR 催化剂所需要的。研究了热解温度对最终产物 ORR 性能的影响。结果表明，在 900°C 下制备的材料（NGC900）被确定为该系列样品中最佳的 ORR 催化剂。具体来说，NGC900 对 ORR 表现出高效的性能，起始电位为 0.97 V，半波电位为 0.84 V，与碱性介质中稳定性增强的商业 Pt/C 催化剂相当。NGC900 具有优越的 ORR 性能，这可能归因于其表面面积、吡啶氮和缺陷之间的平衡。基于低成本 DESs 设计具有高效 ORR 活性和稳定性的 NGC，为实际应用中能源设备的发展提供了充分的支持。
