▎ 摘　　要

Exploiting high-performance and stable bifunctional electrocatalysts is highly desirable for water splitting applications to obtain large-scale renewable and clean fuels. Herein, a defective Prussian-blue (delta-PB or Fe-1.23(III)[Fe-1.12(II)(CN)(6)](0.87).delta(0.13)) on graphene composite electrocatalyst was fabricated through a facile hydrolytic precipitation process, followed by a single-step carbonization treatment at 600 degrees C (denoted as 8-PB/G-600). The resultant optimized delta-PB/G-600 exhibits remarkable electrocatalytic water splitting in alkaline media, producing lower overpotentials of 189 and 105 mV at a current density of 10 mA cm(-2) for the oxygen evolution reaction and hydrogen evolution reaction, respectively. Most importantly, the 8-PB/G-600 shows remarkable durability for both reactions. The remark-able electrocatalysis was attributed to the abundant active sites and high electrical conductivity with a defective nature, which not only facilitate the electrolyte flux but also maintain the structural stability of 8-PB/G-600. Additionally, the high surface area confirms the facile mass transport and prompts the gaseous release of the composite. (C) 2022 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.