摘要
Quasi-one-dimensional NiO with a hierarchically porous structure was synthesized through a facile coordination−precipitation method with the coupling effect of ammonia and a post-calcination treatment.The electrocatalytic properties of NiO fibers for the oxidation of ethanol were compared with those of NiO spheres.The results show that the fibrous NiO possesses a larger specific surface area of 140.153 m2/g and a lower electrical resistivity of 4.5×105Ω·m,leading to an impressively superior electrocatalytic activity to spherical NiO for ethanol oxidation in alkaline media.The current decay on fibrous NiO at 0.6 V in 100−900 s was 0.00003%,which is much lower than that of spherical NiO,indicating its better stability.The unique morphology and hierarchically porous structure give the fibrous NiO great potential to be used as an anodic electrocatalyst for direct ethanol fuel cells.
利用氨的配合作用,采用配位沉淀法及后续煅烧处理制备具有分级多孔结构的准一维NiO粉末。通过与球形NiO比较,对纤维状NiO催化乙醇氧化的电催化性能进行研究。结果表明,纤维状NiO具有更大的比表面积(140.153 m^2/g)以及更低的电阻率(4.5×10~5Ω·m),从而在碱性介质中对乙醇氧化反应具有更优越的电催化活性。在0.6 V极化电位下,纤维状NiO在100~900 s的电流衰减仅为0.00003%,远低于球形NiO,显示其更好的稳定性。这种特殊的形貌和分级多孔结构使纤维状NiO作为直接乙醇燃料电池的阳极电催化剂具有很大的应用潜力。
基金
Project(51404306)supported by the National Natural Science Foundation of China
Project(JNJJ201613)supported by Jiana Foundation of Central South University,China
Project(2017YFC0210401)supported by the National Key Research and Development Program of China。
