Novel Stable Co<sub>3</sub>O<sub>4</sub>-SnO<sub>2</sub> Heterojunction Electrocatalysts with Low Oxygen Evolution Potential.

According to the ESCA of several groups of catalysts, it was found that compared with the 51.55 cm −2 of SC4, the ESCA values of SC1 (43.93 cm −2 ), SC2 (48.58 cm −2 ), and SC3 (52.82 cm −2 ) catalysts with heterojunction formation increased gradually, and they showed a trend of increasing ESCA with the increase in Co concentration.

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