The development of advanced bifunctional electrodes with high activity and durability is essential for the development of simplified overall water-splitting systems. Herein, we report ruthenium-based P-doped carbon (RuO_x/P-C) hybrids as high bifunctional activity catalysts, where lignin and phytic acid were used as C and P sources, respectively, to form lignin-phytic acid networks via complexation and electrostatic interaction. The resulting RuO_x/P-C catalysts exhibit enhanced catalytic performance for solar-assistant water splitting. For the hydrogen evolution reaction (HER), RuO_x/P-C achieves low onset potentials of 24 mV (1.0 M H_2SO_4) and 30 mV (1.0 M KOH) at 10 mA cm~(-2), as well as small Tafel slopes of 33 and 30 mV dec~(-1), respectively. For the PEC cell, RuO_x/P-C/W:BiVO achieves a photocurrent of 1.08 mA cm~(-2) at 1.23 V, which is 1.3 times higher than that of pristine W:BiVO. The above results are attributable to the synergistic coupling effects among active species.
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