Graphitic nanostructures in a porous carbon framework significantly enhance electrocatalytic oxygen evolution

Gadipelli, Srinivas; Li, Zhuangnan; Zhao, Tingting; Yang, Yuchen; Yildirim, Taner; Guo, Zhengxiao

doi:10.1039/c7ta03027d

Cited by 34 publications

(27 citation statements)

References 51 publications

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“…However, in the literature these ZIF-derived carbon structures are far from the ideal system, commonly due to inadequate processing methods. The carbonization of ZIFs is frequently carried out at elevated temperature, beyond 600 C and up to 1100 C. 3,4,16,[20][21][22][23][24][25][26][27][28] This carbonization temperature is a critical parameter to control the respective elemental concentration in the targeted M-N-C system. The hightemperature treatment of the ZIF precursors usually induces a low catalyst yield with a mass loss of >70 wt%, mostly due to the dissociation of the highly desirable active -N-C, or hydrocarbon content.…”

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confidence: 99%

An efficient carbon-based ORR catalyst from low-temperature etching of ZIF-67 with ultra-small cobalt nanoparticles and high yield

et al. 2019

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confidence: 99%

An efficient carbon-based ORR catalyst from low-temperature etching of ZIF-67 with ultra-small cobalt nanoparticles and high yield

et al. 2019

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“…The ZIF‐8 exhibits a negligible OER activity compared with a high current response from ZIF‐67. A potential of approximately 1.72 V (vs. reversible hydrogen electrode (RHE) with onset potential being close to 1.6 V) to reach an impressive benchmark current density of 10 mA cm −2 in ZIF‐67 is comparable to many of the carbon‐based nanostructures reported [35, 37–39] …”

Section: Resultsmentioning

confidence: 88%

Synthesis and Optimization of Zeolitic Imidazolate Frameworks for the Oxygen Evolution Reaction

Gadipelli

2020

Chemistry A European J

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Metal–organic frameworks/zeolitic imidazolate frameworks (MOFs/ZIFs) and their post‐synthesis modified nanostructures, such as oxides, hydroxides, and carbons have generated significant interest for electrocatalytic reactions. In this work, a high and durable oxygen evolution reaction (OER) performance directly from bimetallic Zn100−xCox‐ZIF samples is reported, without carrying out high‐temperature calcination and/or carbonization. ZIFs can be reproducibly and readily synthesized in large scale at ambient conditions. The bimetallic ZIFs show a systematic and gradually improved OER activity with increasing cobalt concentration. A further increase in OER activity is evidenced in ZIF‐67 polyhedrons with controlled particle size of <200 nm among samples of different sizes between 50 nm and 2 μm. Building on this, a significantly enhanced, >50 %, OER activity is obtained with ZIF‐67/carbon black, which shows a low overpotential of approximately 320 mV in 1.0 m KOH electrolyte. Such activity is comparable to or better than numerous MOF/ZIF‐derived electrocatalysts. The optimized ZIF‐67 sample also exhibits increased activity and durability over 24 h, which is attributed to an in situ developed active cobalt oxide/oxyhydroxide related nanophase.

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“…The catalytic performance of CoP@HPC−T showed that carbonization temperature had a significant effect on their catalytic activity. The excellent catalytic performance of CoP@HPC‐500 benefited from the complete phosphorization, while the reduction of CoP@HPC‐T activity may be attributed to the reduction tendency of phosphorisation and the increase of particle size due to the higher temperatures induced metal aggregation . Comparatively, to further confirm the effect of phosphorization, the hydrolytic of AB by using the Co@HPC‐500 was also performed.…”

Section: Resultsmentioning

confidence: 98%

Cobalt‐Based MOF‐Derived CoP/Hierarchical Porous Carbon (HPC) Composites as Robust Catalyst for Efficient Dehydrogenation of Ammonia‐Borane

Zhang

et al. 2020

ChemistrySelect

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Transition‐metal phosphides (TMP), particularly cobalt phosphide (CoP) has drawn considerable attention in heterogeneous catalysis during the past few years due to their robust stability, corrosion resistance and low cost. In this work, a series of hierarchically porous carbon supported non‐precious CoP NPs by using Co–MOF‐74 as self‐sacrificed templates have been synthesized through a stepwise calcinations and phosphorization method. The catalytic performance of the resulted CoP@HPC−T composites toward the hydrolytic dehydrogenation of ammonia‐borane (AB) has been systematically investigated, of which, the resultant CoP@HPC−T calcinated at 500 °C showed the best catalytic performance with a TOF value of 27.7 min−1, and relatively low activation energy (42.55 kJ/mol) even comparable to those reported noble metal catalysts. Furthermore the robust structure of CoP@HPC−T compared to the Co@HPC−T counterpart in the recycle tests, demonstrating their great potential for practical application.

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Graphitic nanostructures in a porous carbon framework significantly enhance electrocatalytic oxygen evolution

Cited by 34 publications

References 51 publications

An efficient carbon-based ORR catalyst from low-temperature etching of ZIF-67 with ultra-small cobalt nanoparticles and high yield

An efficient carbon-based ORR catalyst from low-temperature etching of ZIF-67 with ultra-small cobalt nanoparticles and high yield

Synthesis and Optimization of Zeolitic Imidazolate Frameworks for the Oxygen Evolution Reaction

Cobalt‐Based MOF‐Derived CoP/Hierarchical Porous Carbon (HPC) Composites as Robust Catalyst for Efficient Dehydrogenation of Ammonia‐Borane

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