Journal
JOURNAL OF MATERIALS CHEMISTRY A
Volume 7, Issue 8, Pages 3664-3672Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c8ta11400e
Keywords
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Funding
- National Natural Science Foundation of China [51433001, 51773035]
- Fundamental Research Funds for the Central Universities [2232016A3-02]
- Shanghai Rising-Star Program [18QA1400200]
- Natural Science Foundation of Shanghai [17ZR1439900]
- Program of Shanghai Academic Research Leader [17XD1400100]
- Science and Technology Commission of Shanghai Municipality [16520722100]
- Shanghai Scientific and Technological Innovation Project [18JC1410600]
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Developing active and stable electrocatalysts of earth-abundant elements towards the oxygen reduction reaction (ORR), oxygen evolution reaction (OER) and hydrogen evolution reaction (HER) still remains a crucial challenge. Herein, a cobalt-containing metal-organic framework using adenine as a ligand was synthesized and pyrolyzed without any other precursors, forming a cobalt nanoparticle-embedded nitrogen-doped carbon/carbon nanotube framework (Co@N-CNTF). Due to the abundant active sites of homogeneously distributed cobalt nanoparticles within nitrogen-doped graphitic layers, the resultant Co@N-CNTF catalysts exhibit an efficient and stable electrocatalytic performance as a tri-functional catalyst towards the ORR, OER and HER, including a high half-wave potential of 0.81 V vs. RHE for the ORR, and a low overpotential at 10 mA cm(-2) for the OER (0.35 V) and HER (0.22 V). As a proof-ofconcept, the Co@N-CNTF as an OER/HER bifunctional catalyst for full water splitting affords an alkaline electrolyzer with 10 mA cm(-2) under a stable voltage of 1.71 V. Moreover, an integrated unit of a watersplitting electrolyzer using the Co@N-CNTF catalysts, which is powered with a rechargeable Zn-air battery using the Co@N-CNTF as an ORR/OER bifunctional catalyst on air electrodes, can operate under ambient conditions with high cycling stability, demonstrating the viability and efficiency of the selfpowered water-splitting system.
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