Synergistic O–V–O covalent bonding at a BiVO 4 /FeNiO x interface boosts charge transfer for efficient photoelectrochemical water splitting

. This optimized interfacial configuration facilitates charge transport, culminating in a substantial 76% reduction in charge transfer resistance. This work highlights the potential of interfacial engineering in facilitating charge transport, providing insights into the rational design of efficient photoanodes for solar energy conversion.