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Abstract Rational design and fabrication of efficient catalysts for overall water splitting in an integrated electrolyzer are essential for energy storage and conversion. Herein, an ultra‐small substitutional Zn‐doped Ru/RuO 2 heterostructure (5.6 nm) is synthesized through a facile pyrolyzing strategy as an efficient bi‐functional electrocatalyst for water splitting in both acidic and alkaline media. Experiments demonstrate that introducing appropriate alien atoms into RuO 2 with an amorphous state can effectively optimize the electron structure and expose abundant defects, and thus increasing the number of active sites and improving the intrinsic activity of RuO 2 for the oxygen evolution reaction (OER). In addition, the high hydrogen adsorption capability of metallic Ru makes Ru‐RuO 2 heterointerface suitable for water splitting. Notably, the Ru/ZnRuO 2 displays low overpotentials at 10 mA cm −2 with only 184 mV for OER in 0.5 m H 2 SO 4 and 35 mV for HER in 1.0 m KOH. Besides, the as‐synthesized Ru/ZnRuO 2 displays cell voltages of 1.540 and 1.567 V (at 10 mA cm −2 ) for water splitting with remarkable durability for more than 220 and 100 h, respectively, in acidic and alkaline media. This work provides a facile strategy for designing pH‐universal electrocatalysts toward overall water splitting.
Zhang et al. (Tue,) studied this question.
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