Cu can help Co3O4: The Cu2+ ions can improve the growth of a onedimensional Co3O4 catalyst on stainless steel mesh by facilitating the nucleation process. With higher mass loading and coverage density, the 1 D nanostructured Co3O4 grown with Cu2+ ions addition has larger catalytic surface area per unit area of support and, hence, exhibits higher catalytic activity for CH4 oxidation than the Co3O4 grown without Cu2+ added.
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