Nitride photocatalyst to generate hydrogen gas from water

We propose a new nitride photocatalyst of an n‐n+‐GaN structure to increase H2 gas generation. This structure consists of a thin lightly‐doped n‐type layer on a heavily‐doped n+‐type layer to realize an optimized depletion layer for optical absorption and highly conductive region, respectively. An optimized n‐n+‐GaN structure could generate much more H2 gas rather than a single n‐GaN layer structure by about 1.4 times. (© 2008 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)