Chen, S.Qiao, S.2014-11-132014-11-132013ACS Nano, 2013; 7(11):10190-101961936-08511936-086Xhttp://hdl.handle.net/2440/87138Publication Date (Web): October 3, 2013In this work, we report a three-dimensional (3D) oxygen evolution reaction (OER) catalyst with hierarchical pores for water splitting. The remarkable features of well-developed in- and out-of-plane pores, 3D conductive networks, and N-doping have greatly promoted the transport in electrodes and assured high catalytic efficiency. The 3D hybrid paper of N-doped graphene–NiCo₂O₄ has shown a remarkable OER catalytic activity that was comparable to that of previously reported noble metal catalysts (IrO₂). The catalytic process occurred with favorable kinetics and strong durability. The dual-active-site mechanism is responsible for the excellent performance of the hybrid catalyst; that is, the edges of NiCo₂O₄and the N (O)–metal (Ni or Co) bonds are both active sites. This study affords a new strategy to achieve optimal performance in 3D catalysts, which may be extended to the preparation of other 3D hybrid materials for a broad range of technological applications.en© 2013 American Chemical Societyhierarchical porous structure; nitrogen-doped graphene; ternary metal oxides; oxygen evolution; synergistic effectJournal article002013360210.1021/nn404444r0003277522000672-s2.0-8488887955116959Qiao, S. [0000-0002-1220-1761] [0000-0002-4568-8422]