Retraction: Nickel nanoparticles immobilized on three-dimensional nitrogen-doped graphene as a superb catalyst for the generation of hydrogen from the hydrolysis of ammonia borane

Retraction of ‘Nickel nanoparticles immobilized on three-dimensional nitrogen-doped graphene as a superb catalyst for the generation of hydrogen from the hydrolysis of ammonia borane’ by Mojtaba Mahyari and Ahmad Shaabani, J. Mater. Chem. A , 2014, 2 , 16652–16659, https://doi.org/10.1039/C4TA03940H.