Graphene-Co₃O₄ nanocomposite as electrocatalyst with high performance for oxygen evolution reaction.
Graphene-Co₃O₄ nanocomposite as electrocatalyst with high performance for oxygen evolution reaction.
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石墨烯-Co3O4纳米复合材料作为高性能析氧反应电催化剂
DOI：
10.1038/srep07629
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发表时间：
2015-01-06
影响因子：
4.6
通讯作者：
Wang G
中科院分区：
文献类型：
--
作者：
Zhao Y;Chen S;Sun B;Su D;Huang X;Liu H;Yan Y;Sun K;Wang G
成功地合成了一种具有独特的石墨烯-钴氧化物复合物，并将其作为一种高效的析氧电催化剂。场发射扫描电子显微镜（FESEM）和透射电子显微镜（TEM）分析证实，Co_xO所得复合物在碱性和中性电解质中均显示出增强的催化活性。在1 M KOH溶液中，析氧反应的起始电位为0.406 V（相对于Ag/AgCl），在中性磷酸盐缓冲溶液（PBS）中，析氧反应的起始电位为0.858 V（相对于Ag/AgCl）。在1 M KOH中过电位为313 mV和PBS中过电位为498 mV时，电流密度达到10 mA/cm（2）。石墨烯-钴氧化物复合物在碱性和中性电解质中也表现出优异的稳定性。特别地，在碱性溶液中测试10小时后没有观察到明显的电流密度衰减，并且材料的形态保持良好，这可以归因于将Co 2 O3和石墨烯组合的协同效应。
Graphene-Co₃O₄ composite with a unique sandwich-architecture was successfully synthesized and applied as an efficient electrocatalyst for oxygen evolution reaction. Field emission scanning electron microscopy (FESEM) and transmission electron microscopy (TEM) analyses confirmed that Co₃O₄ nanocrystals were homogeneously distributed on both sides of graphene nanosheets. The obtained composite shows enhanced catalytic activities in both alkaline and neutral electrolytes. The onset potential towards the oxygen evolution reaction is 0.406 V (vs. Ag/AgCl) in 1 M KOH solution, and 0.858 V (vs. Ag/AgCl) in neutral phosphate buffer solution (PBS), respectively. The current density of 10 mA/cm(2) has been achieved at the overpotential of 313 mV in 1 M KOH and 498 mV in PBS. The graphene-Co₃O₄ composite also exhibited an excellent stability in both alkaline and neutral electrolytes. In particular, no obvious current density decay was observed after 10 hours testing in alkaline solution and the morphology of the material was well maintained, which could be ascribed to the synergistic effect of combining Co₃O₄ and graphene.
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