Correction to: Journal of Materials Science: Materials in Electronics (2019) 30:18424–18431 https://doi.org/10.1007/s10854-019-02196-x

Figure 1 in the original article has been found to be erroneous after checking the XRD raw data. Figure 1 below provides the correct figure. This correction does not affect the conclusion.

Fig. 1
figure 1

XRD patterns of the nickel cobalt oxide catalysts