| 초록 |
A noble metal-free, bifunctional electrocatalyst with high activity and stability is needed to replace existing precious ones for electrochemical energy conversion and storage systems. We report steam activated rGO/Fe hybrid structure branched by N doped CNT for ORR and OER electrocatalysts. Through the adequate choice of ferrocene precursor and microwave method, the CNT branches, the active Fe phase, and N-doping are accomplished simultaneously to construct a bifunctional electrocatalyst. The Fe2O3/N-CNT@srGO hybrid catalyst achieves an ORR onset potential of 0.72 V, a mass activity of 605.30 mA·mgactive-1 , an OER onset potential of 1.63 V, and a Tafel slope of 61 mV·dec-1, which are much higher compared to those of the Fe2O3/CNT@srGO, Fe2O3@N-srGO, and Fe2O3@N-CNT catalysts. These results indicate the enhancement of bifunctional catalytic activity due to hierarchical structure, CNT branches, and N-doping. |
