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| Oxygen evolution reaction (OER) is closely related to numerous energy-related applications so that developing high-activity, durable and cost-effective electrocatalysts for OER has been an inevitable trend. Prussian blue analogues (PBAs), a kind of metal organic frameworks (MOFs), which have been paid more attention in the filed of electrocatalysis because of unique framework structure and adjustable components. Herein, we synthesis a series of Ni-Co PBAs via modulating metal ratio by a coprecipitation method and then anneal the as-prepared Ni-Co PBAs, which used as OER catalysts. We found that as the increasing of nickel content, the size of catalysts decreases, which resulting in an increasing of specific surface area and electrochemical active sites, thereby improving the performance of OER. Furthermore, benefiting from the minimum size with largest specific area, largest electrochemical active surface area with different and abundant active sites, the Ni-Co-31 oxides shows a small overpotential of 340 mV at a current density of 10 mAocm-2, a small Tafel slope of 89 mVodec-1, which is superior to other catalysts prepared. This work proves the great significance of PBAs derivatives with different metal ratios for OER performance, which is meaningful for the preparation and mass production of efficient electrocatalysts. |
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| Keywords:Metal organic frameworks; Prussian blue analogues; binary metal oxides; Oxygen evolution reaction |
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