Microwave-assisted synthesis of nanosphere-like NiCo2O4 consisting of porous nanosheets and its application in electro-catalytic oxidation of methanol
Microwave-assisted synthesis of nanosphere-like NiCo2O4 consisting of porous nanosheets and its application in electro-catalytic oxidation of methanol
复制标题
微波辅助合成多孔纳米片状纳米球NiCo2O4及其在甲醇电催化氧化中的应用
DOI：
10.1016/j.jpowsour.2014.03.098
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发表时间：
2014-09-01
影响因子：
9.2
通讯作者：
Xiao, Dan
中科院分区：
文献类型：
--
作者：
Gu, Li;Qian, Lei;Xiao, Dan
采用微波辅助快速合成和后焙烧工艺制备了三维纳米球状NiCo2O4纳米结构。三维NiCo2O4纳米球是由相互缠绕的二维超薄介孔纳米片构成的。纳米球状NiCo2O4具有较大的比表面积(比表面积为146.5 m(2)g(-1))，并成功地应用于甲醇的电催化氧化。采用电化学阻抗谱(EIS)、循环伏安法(CV)和计时安培法(CA)研究了所制备的NiCo2O4的电催化性能。NiCo2O4/泡沫镍(NiCo2O4/nF)电极在1MKOH和0.5M甲醇中的电流密度可达40.9Ag(-1)。长期循环(500次)后，用0.5M甲醇代替新的1M氢氧化钾电解液，电流密度可恢复到原值的97%。这些结果表明，我们制备的NiCo2O4对甲醇氧化具有很高的电催化活性和良好的长期稳定性。这可能得益于独特的多孔纳米球状结构和大的比表面积。(C)2014爱思唯尔B.V.保留所有权利。
A fast microwave-assisted synthesis method followed by a post-calcining process is used to prepare three-dimensional (3D) nanosphere-like NiCo2O4 nanostructure. The 3D NiCo2O4 nanospheres are constructed by intertwined two-dimensional (2D) ultrathin mesoporous nanosheets. The nanosphere-like NiCo2O4 has a large specific surface area (SSA, 146.5 m(2) g(-1)) and is successfully applied to electrocatalytic oxidation of methanol. Electrochemical impedance spectroscopy (EIS), cyclic voltammetry (CV) and chronoamperometry (CA) measurements are used to investigate electro-catalytic performance of the as-prepared NiCo2O4. The current density of NiCo2O4/Ni foam (NiCo2O4/NF) electrode in 1 M KOH with 0.5 M methanol is up to 40.9 A g(-1). And the current density can be returned to 97% of the original value by replacing new 1 M KOH electrolyte with 0.5 M methanol after a long-term CV cycle (500 cycles). These results show that our prepared NiCo2O4 possesses high electro-catalytic activity and good longterm stability for methanol oxidation. This may be benefit from the unique porous nanosphere-like structure and large SSA. (C) 2014 Elsevier B.V. All rights reserved.