To accrue the full environmental benefit of hydrogen as an energy carrier, we need to develop new visible-light-active photocatalyst. Here, the LaNi(0.7)Cu(0.3)O(3), was used as a precursor and then treated at various temperatures (523-673 K) for 2 h under continuous H(2) flow. Among all the resultant photocatalysts, the LaNi(0.7)Cu(0.3)O(3) treated at 573 K, exhibited highest photocatalytic activity when exposed to visible-light irradiation. We characterized the samples by XRD, DRS, XPS and PL. It was found that a perovskite-related material with proper oxygen vacancies and Cu(2+)/Cu(1+) redox couples facilitated the enhancement in photocatalytic activity. Crown Copyright (C) 2010 Published by Elsevier Ltd on behalf of Professor T. Nejat Veziroglu. All rights reserved.