Journal
ACS NANO
Volume 11, Issue 4, Pages 4358-4364Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsnano.7b01946
Keywords
carbon membrane; N-doping; hierarchical architecture; electrocatalyst; water splitting
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Funding
- King Abdullah University of Science and Technology (KAUST)
- National Natural Science Foundation of China [21463001]
- Max Planck Society, Germany
- Clarkson University, USA
- ERC (European Research Council) [639720-NAPOLI]
- Australian Research Council (ARC) - Linkage, Infrastructure, Equipment and Facilities (LIEF) grant [LE120100104]
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Self-supported electrocatalysts being generated and employed directly as electrodes for energy conversion has been intensively pursued in the fields of materials chemistry and energy. Herein, we report a synthetic strategy to prepare freestanding hierarchically structured, nitrogen-doped nanoporous graphitic carbon membranes functionalized with Janus-type Co/CoP nano crystals (termed as HNDCM-Co/CoP), which were successfully applied as a highly efficient, binder-free electrode in the hydrogen evolution reaction (HER). Benefited from multiple structural merits, such as a high degree of graphitization, three-dimensionally interconnected micro/meso/macropores, uniform nitrogen doping, well-dispersed Co/CoP nanocrystals, as well as the confinement effect of the thin carbon layer on the nanocrystals, HNDCM-Co/CoP exhibited superior electrocatalytic activity and long-term operation stability for HER under both acidic and alkaline conditions. As a proof-of-concept of practical usage, a 5.6 cm x 4 cm x 60 FM macroscopic piece of HNDCM-Co/CoP was prepared in our laboratory. Driven by a solar cell, electroreduction of water in alkaline conditions (pH 14) was performed, and H-2 was produced at a rate of 16 mL/min, demonstrating its potential as real-life energy conversion systems.
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