Long-term stabilized high-density CuBi₂O₄/NiO heterostructure thin film photocathode grown by pulsed laser deposition

Abstract

Harvesting sustainable hydrogen through water-splitting requires a durable photoelectrode to achieve high efficiency and long lifetime. Dense, uniform CuBi₂O₄/NiO thin film photocathodes grown by pulsed laser deposition achieved photocurrent density over 1.5 mA cm^-2 at 0.4 V_RHE and long-term chronoamperometric stability for over 8 hours.