Using Pd as a Cocatalyst on GaN–ZnO Solid Solution for Visible-Light-Driven Overall Water Splitting

Rhodium was reported to be an essential component of the efficient cocatalyst (Rh2−xCrxO3 or core/shell of Rh@Cr2O3) on GaN–ZnO for photocatalytic overall water splitting (POWS). Herein we demonstrate that the Rh can be replaced by less-expensive Pd deposited via atomic layer deposition and together with photodeposition of Cr2O3 shell, a comparable activity in POWS can be achieved even with much less Pd loading than Rh in Rh2−xCrxO3/GaN–ZnO under the same reaction conditions.