  Considering generalised action for dilaton coupled Maxwell-Einstein theory in
four dimensions, Gao and Zhang obtained black holes solutions for
asymptotically anti de Sitter (Ads) and de Sitter (ds) spacetimes. We study the
Hawking radiation in Parikh-Wilczek's tunneling formalism as well as using
Bogoliubov transformations. We compare the expression of the Hawking
temperature obtained from these two different approaches. Stability and the
extremality conditions for such black holes are discussed. The exact
dependences of the Hawking temperature and flux on the dilaton coupling
parameter are determined. It is shown that the Hawking flux increases with the
dilaton coupling parameter. Finally we show that the expression for the Hawking
flux obtained using Bogoliubov transformation matches exactly with flux
calculated via chiral gauge and gravitational anomalies. This establishes a
correspondence among all these different approaches of estimating Hawking
radiation from these class of black holes.
