Boosting the charge transfer of FeOOH/Ni(OH)2 for excellent oxygen evolution reaction via Cr modification

For the electrocatalytic oxygen evolution reaction (OER) in alkaline media, there is an urgent need to optimize the adsorption strength of OH*. Here, a flower-like hybrid of Cr-doped FeOOH/Ni(OH)(2) was used as an OER catalyst with a low overpotential of 291 mV at 50 mA cm(-2). The results showed that faster charge transfer was achieved at the electrode/solution interface during the OER process after the FeOOH/Ni(OH)(2) was modified by Cr, which facilitates the rate-determining step of the Volmer reaction. Furthermore, the results of faradaic efficiency and X-ray photoelectron spectroscopy (XPS) measurements confirmed that the synergistic effect between the ternary metal and oxygen vacancies led to excellent OER performance. This work provides a new strategy for the preparation of high-efficiency and low-cost oxygen evolution electrocatalysts.

Automated summary

In this study, a flower-like hybrid of Cr-doped FeOOH/Ni(OH)(2) was utilized as an OER catalyst, achieving a low overpotential of 291 mV at 50 mA cm(-2). The modification of FeOOH/Ni(OH)(2) by Cr facilitated faster charge transfer at the electrode/solution interface during the OER process, enhancing the rate-determining step of the Volmer reaction and leading to excellent OER performance through synergistic effects between the ternary metal and oxygen vacancies.