Self‐Assembly of Three‐Dimensional Zinc‐Doped NiCo2O4 as Efficient Electrocatalysts for Oxygen Evolution Reaction
Self‐Assembly of Three‐Dimensional Zinc‐Doped NiCo2O4 as Efficient Electrocatalysts for Oxygen Evolution Reaction
复制标题
三维锌掺杂 NiCo2O4 自组装作为析氧反应的高效电催化剂
DOI：
10.1002/chem.201802325
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发表时间：
2018
影响因子：
4.3
通讯作者：
YanXing
中科院分区：
文献类型：
--
作者：
Man Yang;Yunfeng Li;YueYu;Xianchun Liu;Zhan Shi;YanXing
本文采用溶剂热法在不使用任何模板的情况下，成功制备了一系列不同Zn掺杂量的三维多孔花状ZnCo 2 O 4（ZNCO）纳米结构。通过各种技术对所得产物进行了表征，并通过析氧反应（OER）评价了其电催化性能。根据电化学表征，证明ZNCO-0.15（即，Zn0.15Ni0.85Co2O4）纳米花比Co 3 O 4、NiCo 2 O 4和ZnCo 2 O 4纳米花具有更低的过电位、更小的塔菲尔斜率、更高的电化学活性表面积（ECSA）和更大的转换频率（TOF）值，表明引入最佳含量的锌离子对增强OER的电催化性能具有重要作用。ZNCO-0.15的OER性能的提高可归因于锌离子的引入增加了催化剂的活性中心（Co 3+）数量、加快了动力学速率和促进了催化剂的导电性。
In this work, a series of three-dimensional porous flower-like zinc doped NiCo2O4 (ZNCO) nanostructures with different Zn doping level are successfully prepared by a facile solvothermal process without using any templets. The obtained products are characterized by various techniques, and their electrocatalytic performances are also assessed by the oxygen evolution reaction (OER). According to the electrochemical characterization, it is demonstrated that ZNCO-0.15 (i.e., Zn0.15Ni0.85Co2O4) nanoflowers show a lower overpotential, smaller Tafel slope, higher electrochemical active sur- face area (ECSA), as well as alarger turnover frequency (TOF) value than those of Co3O4, NiCo2O4, and ZnCo2O4 nanoflowers, indicating that introduction of an optimal content of zinc ions plays an important role in enhancing electrocatalytic performances for OER. The enhancedOER performance of ZNCO-0.15 could be attributed to the increased number of active sites (Co3+), accelerated kinetic rate, and promoted conductivity of the catalyst with the incorporation of zinc ions.