Fig. 3
From: Rational design of photocatalysts for ammonia production from water and nitrogen gas
a The band alignments of widely used photocatalysts. b The Tauc plot (ahv)2 versus (hv) for the caluate the optical band gap energy Eg. c The color of Ni-x-TiO2 gradually deepens with the increase of the amount of Ni2+. d The N2-TCD spectrums of Ni-0.8-TiO2(red) and TiO2(black), respectively. e Bader charge density difference of Ni doped TiO2; Ti(silver), Ni(blue), and O(red). Reproduced with permission [45]. Copyright 2020, Americal Chemical Society