The trend of pH variation during the reaction process, the proposed intercalation/deintercalation mechanism and electrocatalytic performance of Co(OH)₂ with varying NaOH-to-CoSO₄ ratios. (IMAGE)

Science China Press

The trend of pH variation during the reaction process, the proposed intercalation/deintercalation mechanism and electrocatalytic performance of Co(OH)₂ with varying NaOH-to-CoSO₄ ratios.

Caption

(A) Observation of pH as a function of time for the reaction process of NaOH-pour-4.55:1-CoSO4·7H2O, NaOH-pour-2.55:1-CoSO4·7H2O, NaOH-pour-2:1-CoSO4·7H2O and NaOH-pour-1:1-CoSO4·7H2O. (B) The relationship between pH of the final reaction solution, reaction rate, and the deintercalation/retention of tetrahedral Co2+. The regions shaded in blue and pink highlight the deintercalation and retention of tetrahedral Co2+, respectively. (C) Illustration of the proposed intercalation/deintercalation mechanism. (D) LSV curves and (E) Tafel slopes of different electrocatalysts.

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