Coffee‐Waste Templating of Metal Ion‐Substituted Cobalt Oxides for the Oxygen Evolution Reaction. Issue 3 (15th January 2018)

• Record Type: Journal Article
• Authors: Yu, Mingquan; Chan, Candace K.; Tüysüz, Harun
• Is Part Of: ChemSusChem. Volume 11:Issue 3(2018)
• Page Start: 605
• Page End: 611
• Publication Date: 2018-01-15
• Subjects: cobalt -- electrocatalysis -- nanostructures -- oxygen evolution reaction -- waste valorization; Green chemistry -- Periodicals; Sustainable engineering -- Periodicals; Chemistry -- Periodicals; Chemical engineering -- Periodicals; 660
• DOI: 10.1002/cssc.201701877
• Languages: English
• ISSNs: 1864-5631

Abstract

Abstract: A facile and scalable method using coffee waste grounds as a hard template has been developed to fabricate nanostructured Co3 O4 for the oxygen evolution reaction (OER). Co3 O4 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 Co3 O4 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 Co3 O4 with the same nanostructure, which is highly desirable for large‐scale application. Abstract : Grounds for electrocatalysis : A scalable method to fabricate nanostructured Co3 O4 for the oxygen evolution reaction was developed by using waste coffee grounds as a hard template. Substitution on the octahedral and tetrahedral sites of the spinel structure increases the activity, whereas the incorporation of W leads to a second phase and significantly higher electrocatalytic performance.