Journal
ACS NANO
Volume 7, Issue 11, Pages 10190-10196Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nn404444r
Keywords
hierarchical porous structure; nitrogen-doped graphene; ternary metal oxides; oxygen evolution; synergistic effect
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Funding
- Australian Research Council [DP1095861, DP130104459]
- Australian Research Council [DP1095861] Funding Source: Australian Research Council
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In 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 NiCo2O4 and the N (0)-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.
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