State Key Laboratory of Physical Chemistry of Solid Surfaces, Engineering Research Center of Electrochemical Technologies of Ministry of Education, College of Chemistry and Chemical Engineering, and Discipline of Intelligent Instrument and Equipment, Xiamen University, Xiamen 361005, PR China.
College of Chemistry and Chemical Engineering, Hainan Normal University, Key Laboratory of Electrochemical Energy Storage and Energy Conversion of Hainan Province, Haikou 571158, PR China.
J Colloid Interface Sci. 2023 Oct;647:224-232. doi: 10.1016/j.jcis.2023.05.107. Epub 2023 May 22.
Enhancing the density and utilization of FeN sites can serve as a viable approach to enhance the catalytic efficacy of iron nitrogen carbon (FeNC) catalysts for oxygen reduction reaction (ORR). Herein, we present a plasma-assisted method for enhancing the porosity of nitrogen-doped carbon. Our findings indicate that the ideal ratio of mesopore to micropore area is 0.463. This ratio not only promotes the diffusion of Fe but also creates additional active sites for Fe loading, leading to an increase in the number of available FeN sites in FeNC electrocatalysts during pyrolysis. The density (76.5 μmol g) and utilization (21.08 %) of d-FeNC-30 are significantly higher than those of FeNC without plasma treatment, with a 2.8-fold and 2-fold increase, respectively. Remarkably, it displays outstanding performance, evidenced by a half-wave potential of 0.835 V (vs. RHE) in a 0.1 M HClO solution and a power density of 0.860 W cm in proton exchange membrane fuel cells (PEMFCs). The developed plasma-assisted approach for improving the site density (SD) and utilization of FeN provides a new perspective for high-performance ORR FeNC catalysts.
提高 FeN 位点的密度和利用率可以作为一种可行的方法来提高铁氮碳 (FeNC) 催化剂对于氧还原反应 (ORR) 的催化效果。在此，我们提出了一种通过等离子体辅助方法来提高氮掺杂碳的多孔性。我们的研究结果表明，介孔与微孔面积的理想比值为 0.463。这个比值不仅促进了 Fe 的扩散，而且为 Fe 负载创造了额外的活性位点，导致在热解过程中 FeNC 电催化剂中可用 FeN 位点的数量增加。相比于未经等离子体处理的 FeNC，d-FeNC-30 的密度（76.5 μmol g）和利用率（21.08%）显著提高，分别提高了 2.8 倍和 2 倍。值得注意的是，它在 0.1 M HClO 溶液中的半波电位为 0.835 V（相对于 RHE），在质子交换膜燃料电池 (PEMFCs) 中的功率密度为 0.860 W cm，表现出了卓越的性能。这种用于提高 FeN 位点密度 (SD) 和利用率的等离子体辅助方法为高性能 ORR FeNC 催化剂提供了新的视角。
