Synthesis of novel ZnS nanocages utilizing ZIF-8 polyhedral template

Jiang, Zhaotan; Sun, Haiyan; Qin, Zhenhua; Jiao, Xiuling; Chen, Dairong

doi:10.1039/c2cc00004k

Cited by 132 publications

(83 citation statements)

References 44 publications

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“…In the growth of ZIF-8 NCs, excess MeIM ligands act as terminating linker units in their protonated form, 48 thus forming substantial C-N/C]N moieties on the surface of the carbon materials aer carbonization, where the catalytic oxygen reduction occurs. To probe the nitrogen atoms in the NGPCs structures, XPS measurements were carried out.…”

Section: Nitrogen-doping Analysis On Ngpcsmentioning

confidence: 99%

Highly graphitized nitrogen-doped porous carbon nanopolyhedra derived from ZIF-8 nanocrystals as efficient electrocatalysts for oxygen reduction reactions

et al. 2014

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Nitrogen-doped graphitic porous carbons (NGPCs) have been synthesized by using a zeolite-type nanoscale metal-organic framework (NMOF) as a self-sacrificing template, which simultaneously acts as both the carbon and nitrogen sources in a facile carbonization process. The NGPCs not only retain the nanopolyhedral morphology of the parent NMOF, but also possess rich nitrogen, high surface area and hierarchical porosity with well-conducting networks. The promising potential of NGPCs as metal-free electrocatalysts for oxygen reduction reactions (ORR) in fuel cells is demonstrated. Compared with commercial Pt/C, the optimized NGPC-1000-10 (carbonized at 1000 C for 10 h) catalyst exhibits comparable electrocatalytic activity via an efficient four-electron-dominant ORR process coupled with superior methanol tolerance as well as cycling stability in alkaline media. Furthermore, the controlled experiments reveal that the optimum activity of NGPC-1000-10 can be attributed to the synergetic contributions of the abundant active sites with high graphitic-N portion, high surface area and porosity, and the high degree of graphitization. Our findings suggest that solely MOF-derived heteroatom-doped carbon materials can be a promising alternative for Pt-based catalysts in fuel cells.

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Section: Nitrogen-doping Analysis On Ngpcsmentioning

confidence: 99%

Highly graphitized nitrogen-doped porous carbon nanopolyhedra derived from ZIF-8 nanocrystals as efficient electrocatalysts for oxygen reduction reactions

et al. 2014

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“…Especially, ZIFs are often used as raw material to directly synthesize hollow nanostructures [13][14][15]. For example, Jiang et al [16] have synthesized ZnS hollow polyhedron with Zncontaining ZIF-8. Shao and co-workers [17] have synthesized Co 3 O 4 hollow dodecahedrons with ZIF-67.…”

Section: Introductionmentioning

confidence: 99%

Co3O4 nanosheet-built hollow dodecahedrons via a two-step self-templated method and their multifunctional applications

Liu

Wang

et al. 2018

Sci. China Mater.

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“…[34][35][36][37][38][39] Therefore, MOFs have emerged as excellent precursors or sacrificial templates for the preparation of porous carbon based nanocomposites, which offer a new approach to improve the catalytic activity and overcome the intrinsic limitations of the existing transition metal/metal oxide electrocatalysts. 34,35,[37][38][39] Metal sulfides derived from MOFs were recent reported; 40,41 however, to the best our knowledge, carbon-based metal sulfide composites derived from MOFs as highly efficient electrocatalysts for ORR/OER are rarely reported previously. Herein, for the first time, we report the successful synthesis of atomically homogeneous dispersed cobalt sulfide/N,S-codoped porous carbon nanocomposites by a facile one-step sulfurization and carbonization of ZIF-67 simultaneously.…”

mentioning

confidence: 99%

Cobalt sulfide/N,S codoped porous carbon core–shell nanocomposites as superior bifunctional electrocatalysts for oxygen reduction and evolution reactions

et al. 2015

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Exploring highly-efficient and low-cost bifunctional electrocatalysts for both oxygen reduction reaction (ORR) and oxygen evolution reactions (OER) in the renewable energy area has gained its momentum but still remains a significant challenge. Here we represent a simple but efficient way that utilizes ZIF-67 as the precursor and template for the one-step generation of homogeneous dispersed cobalt sulfide/N,S-codoped porous carbon nanocomposites as high-performance electrocatalysts. Due to the favourable molecular-like structural features and uniform dispersed active sites in the precursor, the resulting nanocomposites featured with unique core-shell structure, high porosity, homogeneous dispersion active components together with N and S-doping effect, not only show excellent electrocatalytic activity towards ORR with the high onset potential (around -0.04 V vs -0.02 V for benchmark Pt/C catalyst) and four-electron pathway, and OER with a small overpotential of 0.47 V for 10 mA cm −2 current density, but also exhibit superior stability (92%) to commercial Pt/C catalyst (74%) in ORR and promising OER stability (80%) with good methanol tolerance. Our findings suggest that the transition metal sulfide-porous carbon nanocomposites derived from the one-step simultaneously sulfurization and carbonization of zeolitic imidazolate frameworks are excellent alternative bifuncitonal electrocatalysts towards ORR and OER in the next generation of energy storage and conversion technologies.With the depletion of hydrocarbon-based energy resources and the increasing global energy demands, it is imperative to develop green and sustainable energy storage and conversion technologies as alternatives to currently widely used fossil fuels. 1-3 Electrocatalytic oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) play key roles in several important next-generation energy storage and conversion technologies, such as fuel cells, metal-air batteries and water splitting. [4][5][6][7][8][9][10][11][12][13] Hitherto, most efficient electrocatalysts for ORR/OER contain precious metals including Pt or Ir; however, due to the prohibitive cost, poor stability of precious metals, the sluggish kinetics for ORR and the large polarisation, it is highly desirable to discover highly efficient and low-cost earthabundant non-precious electroactive materials that can rival the performances of precious metal-based catalysts. 14-17Many efforts have, therefore, been devoted to transition metal oxides/sulfides based materials, as many transition metals like cobalt, manganese have been widely considered to be electrochemical active for ORR and OER. Particularly, cobalt sulfides (Co x S y ) with different phases have been previously investigated as ORR and OER electrode catalysts and exhibited attractive electrocatalytic performance among different nonprecious and late transition metal chalcogenides.18 Co 9 S 8 is a good catalyst for ORR. 21 However, the complicated preparation procedures coupled with the low electrical conductivities of cobalt s...

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Synthesis of novel ZnS nanocages utilizing ZIF-8 polyhedral template

Abstract: Truncated rhombic dodecahedral zeolitic imidazolate framework-8 (ZIF-8) nanocrystals are fabricated with acetate as a modulating ligand; ZnS hollow polyhedra with uniform morphology are obtained using the ZIF-8 templates.

Cited by 132 publications

References 44 publications

Highly graphitized nitrogen-doped porous carbon nanopolyhedra derived from ZIF-8 nanocrystals as efficient electrocatalysts for oxygen reduction reactions

Highly graphitized nitrogen-doped porous carbon nanopolyhedra derived from ZIF-8 nanocrystals as efficient electrocatalysts for oxygen reduction reactions

Co3O4 nanosheet-built hollow dodecahedrons via a two-step self-templated method and their multifunctional applications

Cobalt sulfide/N,S codoped porous carbon core–shell nanocomposites as superior bifunctional electrocatalysts for oxygen reduction and evolution reactions

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