Abstract
Hybrid carbons, nickel embedded nanographites in a nitrogen-doped porous carbon structure, developed by a simplified CVD fashion, utilizing a solid state precursor, zeolitic-imidazolate-framework, lead to highly enhanced water oxidation activity over simple graphitic or porous carbon based structures alone.
Highlights
A hybrid structure, a graphitic nanostructures@porous carbon framework, is developed by utilizing the bimetallic zeolitic imidazolate framework-8 (ZIF-8) as a solid precursor, simultaneously templating porous carbon and growing graphitic nanocarbon in a simplified chemical vapor deposition (CVD) fashion
Electrochemical studies, under basic conditions, reveal that the ZNDCs with nanographites exhibit a considerable enhancement in their electrocatalytic activity for the oxygen evolution reaction (OER)
The results clearly suggest overall improvements in the OER, ORR and HER catalytic activity of ZNDCs with respect to the increased graphitization
Summary
We have synthesized a precursor Ni–MOF-74, which has been developed from the carboxylate-based linker, 2,5-dihydroxyterephthalalic acid, to exhibit one-dimensional pore channels (Fig. 5 and S16†).[22,25] Surprisingly, the carbonized sample (MDC1000) does not reveal any sign of the development of graphitic nanostructures as observed in nickeldoped ZIF-8 This could be directly attributed to the lower tendency of decomposition of the benzene ring compared to the imidazole ring with volatile nitrogen, as observed from the high temperature TG under inert atmosphere (Fig. 5a). A er acid washing to remove the nickel (MDC1000-aw), the sample exhibits a mesoporous nature with a large pore type, similar to the other salt-templated carbons (Fig. 5b–f, S16 and S17†) Such large clusters of nickel are another reason nanographites are not produced; instead they yield graphitic shells.[14,15,22,42] On the other hand, during the carbonization of ZIF-8, which is an oxygen-free structure, the metal centres are stabilized by the. Carbon samples in a highly porous state or a graphitized state alone without dopants or metal-/ metal–oxide nanocentres do not yield a high enough catalytic activity response
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
