LaNi${}_x$Fe${}_{1-x}$O${}_{3-\delta }$-quantum dot/CNT composite for high performance oxygen evolution reaction

Rational design of active and earth-abundant catalysts toward oxygen evolution reaction (OER) is of particular significance for archiving highly efficient water electrolysis. Herein, a series of perovskite oxide quantum dots with abundant oxygen vacancies adhered on oxidized carbon nanotubes LaNi${}_x$Fe${}_{1-x}$O${}_{3-\delta }$-QDs/CNTs) were fabricated by simple sol-gel and pyrolysis methods. The results indicate that the optimized LaNi${}_{0.3}$Fe${}_{0.7}$O${}_{2.759}$-QDs/CNTs sample with adjust crystal structure, proper ratio of Ni to Fe, and desirable oxygen vacancy concentration shows a low overpotential (0.34 V at 10 mA/cm${}^2$), a low Tafel slope (74 mV dec${}^{-1}$), and excellent stability when it was evaluated as OER electrocatalyst. This work will shed light on the development of precious-metal-free catalysts with promoted catalytic performance (© 2021 Wiley‐VCH GmbH)