Metal-organic framework based nanomaterials for electrocatalytic oxygen redox reaction

Zhang, Kexin; Guo, Wenhan; Liang, Zibin; Zou, Ruqiang

doi:10.1007/s11426-018-9441-4

Cited by 53 publications

(19 citation statements)

References 96 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…7,8 Metal-organic frameworks (MOFs), consisting of organic ligands and metal ion/cluster centers, are promising precursors to fabricate highly porous nanomaterials for energy applications. [9][10][11][12] Using MOFs as sacrificial materials, the obtained highly controlled polyhedron carbon nanocomposites inherit the porous structures of pristine MOFs, and exhibit remarkable electrical conductivity and long-term stability. 13 The derived three-dimensionalordered porous carbon matrix possesses high surface area with highly dispersed and exposed active sites, which are favorable for mass and electron transfer.…”

Section: Introductionmentioning

confidence: 99%

Metal‐organic framework‐derived Fe/Cu‐substituted Co nanoparticles embedded in CNTs‐grafted carbon polyhedron for Zn‐air batteries

Zhang

et al. 2020

Carbon Energy

Self Cite

101

View full text Add to dashboard Cite

Metal‐organic frameworks (MOFs) and MOF‐derived materials have attracted great attention as alternatives to noble‐metal based electrocatalysts owing to their intriguing structure properties, especially for high efficiency and stable oxygen reduction reaction (ORR). Herein, we employed a one‐pot reaction to make a multimetal (Fe, Co, Cu, and Zn) mixed zeolitic imidazolate framework (MM‐ZIF) via adopting a simple in situ redox reaction. Further pyrolysis of the target MM‐ZIF, a highly porous carbon polyhedron (FC‐C@NC) grafted with abundant carbon nanotubes was obtained, in which ultrasmall Co nanoparticles with partial lattice sites substituted by Fe and Cu were embedded. The obtained FC‐C@NC possessed large surface area, highly porous structure, widely‐spread metal active sites, and conductive carbon frameworks, contributing to outstanding ORR activity and long‐term stability. It displayed superior tolerance to methanol crossover and exceeded the commercial Pt/C catalyst and most previously reported non‐noble‐metal catalysts. Impressively, the as‐produced FC‐C@NC‐based zinc‐air battery afforded an open‐circuit potential of 1.466 V, a large specific capacity of 659.5 mAh/g, and a high gravimetric energy density of 784.3 Wh/kgZn, significantly outperforming the Pt/C‐based cathode.

show abstract

Section: Introductionmentioning

confidence: 99%

Metal‐organic framework‐derived Fe/Cu‐substituted Co nanoparticles embedded in CNTs‐grafted carbon polyhedron for Zn‐air batteries

Zhang

et al. 2020

Carbon Energy

Self Cite

101

View full text Add to dashboard Cite

show abstract

“…However, the clustering degree of atoms in the catalysts varies significantly from one to another. To better control the pyrolysis process and metal clustering, some well-defined molecular precursors homogeneously containing the above species, including metalloporphyrins and metal-organic-frameworks (MOFs), have been intensively used [23]. Due to the highly reactive nature of transition metal, the products usually require additional acid washing to remove the aggregated metal particles.…”

Section: General Synthetic Methods For M/n/c Catalystsmentioning

confidence: 99%

Advanced transition metal/nitrogen/carbon-based electrocatalysts for fuel cell applications

et al. 2020

View full text Add to dashboard Cite

The development of advanced transition metal/nitrogen/carbon-based (M/N/C) catalysts with high activity and extended durability for oxygen reduction reaction (ORR) is critical for platinum-group-metal (PGM) free fuel cells but still remains great challenging. In this review, we summarize the recent progress in two typical M/N/C catalysts (atomically dispersed metalnitrogen-carbon (M-N-C) catalysts and carbon-supported metal nanoparticles with N-doped carbon shells (M@NC)) with an emphasis on their potential applications in fuel cells. Starting with understanding the active sites in these two types of catalysts, the representative innovative strategies for enhancing their intrinsic activity and increasing the density of these sites are systematically introduced. The synergistic effects of M-N-C and M@NC are subsequently discussed for those M/N/C catalysts combining both of them. To translate the material-level catalyst performance into high-performance devices, we also include the recent progress in engineering the porous structure and durability of M/N/C catalysts towards efficient performance in fuel cell devices. From the viewpoint of industrial applications, the scale-up cost-effective synthesis of M/N/C catalysts has been lastly briefed. With this knowledge, the challenges and perspectives in designing advanced M/N/C catalysts for potential PGM-free fuel cells are proposed.

show abstract

“…The microbes in an MEC require a neutral working pH, and necessitate a neutral OER at the counter electrode. Unfortunately, the OER kinetics in neutral electrolytes are more sluggish than those in acidic or alkaline electrolytes, leading to much higher overpotentials [3][4][5][6][7][8], which greatly limit the electrical-to-chemical energy conversion efficiencies of MECs.…”

Section: Introductionmentioning

confidence: 99%

The critical role of electrochemically activated adsorbates in neutral OER

et al. 2020

View full text Add to dashboard Cite

Developing efficient electrocatalysts for the oxygen evolution reaction (OER) under neutral conditions is important for microbial electrolysis cells (MECs). However, the OER kinetics in neutral electrolytes at present are extremely sluggish, resulting in high overpotentials that greatly limit the energy conversion efficiencies of MECs. Previous studies failed to probe the adsorbates on surface metal sites of catalysts at the atomic scale and elucidate their influence on the catalytic activities, which has impeded the rational design of efficient neutral OER catalysts with optimal surface structures. Here, using in situ transmission electron microscopy (TEM), in situ X-ray photoelectron spectroscopy (XPS) and in situ low-energy ion scattering studies, we have identified, for the first time, that the electrochemically activated adsorbates on surface metal sites play a critical role in boosting the neutral OER activities of Ru-Ir binary oxide (Ru x Ir y O 2) catalysts. The adsorbate-activated Ru x Ir y O 2 on a glassy carbon electrode achieved a low overpotential of 324 mV at 10 mA cm −2 in neutral electrolyte, with a 36-fold improvement in turnover frequency compared with that of IrO 2 benchmark. Upon application in an MEC system, the resulting full cell showed a decreased voltage of 1.8 V, 200 mV lower than the best value reported to date, facilitating efficient synthesis of poly(3-hydroxybutyrate) from bioelectrochemical CO 2 reduction. Density functional theory (DFT) studies revealed that the enhanced OER activity of Ru x Ir y O 2 catalyst arose from local structural distortion of adjacent adsorbate-covered Ru octa-hedra at the catalyst surface and the consequently decreased adsorption energies of OER intermediates on Ir active center.

show abstract

Metal-organic framework based nanomaterials for electrocatalytic oxygen redox reaction

Cited by 53 publications

References 96 publications

Metal‐organic framework‐derived Fe/Cu‐substituted Co nanoparticles embedded in CNTs‐grafted carbon polyhedron for Zn‐air batteries

Metal‐organic framework‐derived Fe/Cu‐substituted Co nanoparticles embedded in CNTs‐grafted carbon polyhedron for Zn‐air batteries

Advanced transition metal/nitrogen/carbon-based electrocatalysts for fuel cell applications

The critical role of electrochemically activated adsorbates in neutral OER

Contact Info

Product

Resources

About