Coffee-Waste Templating of Metal Ion-Substituted Cobalt Oxides for the Oxygen Evolution Reaction
Coffee-Waste Templating of Metal Ion-Substituted Cobalt Oxides for the Oxygen Evolution Reaction
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DOI：
10.1002/cssc.201701877
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发表时间：
2018-02-09
期刊：
影响因子：
8.4
通讯作者：
Tueysuez, Harun
中科院分区：
文献类型：
--
作者：
Yu, Mingquan;Chan, Candace K.;Tueysuez, Harun
一个简单的和可扩展的方法，使用咖啡渣作为硬模板已被开发用于制备纳米结构的Co3O4的析氧反应（OER）。Co3O4掺入金属具有不同的价态（M/Co = 1：4; M = Cu，Ni，Fe，Cr和W）也制备了类似的片状结构，包括纳米尺寸的微晶。通过X射线衍射、电子显微镜和氮吸附进行详细表征后，氧化物被用作OER电催化剂。用二价和三价过渡金属（Cu、Ni、Fe和Cr）取代尖晶石结构的八面体和四面体位点增加了Co3O4的OER活性，而引入六价W导致形成第二晶相和显著更高的电催化性能。此外，该方法易于规模化以用于具有相同纳米结构的Co3O4的大规模生产，这对于大规模应用是非常期望的。
A facile and scalable method using coffee waste grounds as a hard template has been developed to fabricate nanostructured Co3O4 for the oxygen evolution reaction (OER). Co3O4 incorporating metals with different valences (M/Co=1:4; M=Cu, Ni, Fe, Cr, and W) were also prepared with similar sheet-like structures comprising nanosized crystallites. After detailed characterization by X-ray diffraction, electron microscopy, and nitrogen sorption, the oxides were employed as OER electrocatalysts. Substitution of octahedral and tetrahedral sites of the spinel structure with divalent and trivalent transition metals (Cu, Ni, Fe, and Cr) increased the activity of Co3O4 for the OER, whereas incorporation of hexavalent W led to formation of a second crystal phase and significantly higher electrocatalytic performance. Furthermore, this method is easily scaled up for mass production of Co3O4 with the same nanostructure, which is highly desirable for large-scale application.