Engineering the transition metal hydroxide–photoanode interface with a highly crystalline mediator for efficient photoelectrochemical water splitting

A one-stone-two-birds strategy was developed to engineer the SC/TMH/electrolyte interface by introducing high crystallinity Fe(OH) X -H, and the optimized BV/Fe(OH) X -H/FeNi(OH) X exhibited a noteworthy photocurrent density of 5.34 mA cm −2 .