TY - JOUR
T1 - Coffee-Waste Templating of Metal Ion-Substituted Cobalt Oxides for the Oxygen Evolution Reaction
AU - Yu, Mingquan
AU - Chan, Candace
AU - Tüysüz, Harun
N1 - Funding Information:
This work was financially supported by IMPRS-RECHARGE and MAXNET Energy consortium of Max Planck Society, and Fonds der Chemischen Industrie (FCI). C.K.C. thanks the Alexander von Humboldt Foundation for support of this work through a Humboldt Research Fellowship. The authors thank S. Palm, H. Bon-gard, and B. Spliethoff for microscopy images and EDX analysis and J. Tseng for refinement of XRD patterns.
Publisher Copyright:
© 2018 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim
PY - 2018/2/9
Y1 - 2018/2/9
N2 - 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.
AB - 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.
KW - cobalt
KW - electrocatalysis
KW - nanostructures
KW - oxygen evolution reaction
KW - waste valorization
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U2 - 10.1002/cssc.201701877
DO - 10.1002/cssc.201701877
M3 - Article
C2 - 29194977
AN - SCOPUS:85040546331
SN - 1864-5631
VL - 11
SP - 605
EP - 611
JO - ChemSusChem
JF - ChemSusChem
IS - 3
ER -