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Comparative study of catalytic activities among transition metal-doped IrO₂ nanoparticles.

ABSTRACT: Catalytic activities of transition metal-doped IrO₂ nanoparticles (TM-IrO₂ NPs; TM?=?Cr, Mn, Fe, Co, or Ni) are compared for various oxidation reactions such as electrochemical oxygen evolution reaction (OER), gas-phase photo-oxidation of thiol function group, and CO oxidative conversion. Here, we discovered a series of TM-IrO₂ catalysts have a common activity trend for these oxidation reactions, and their activities are closely related with modified electronic states of IrO₂, strongly affected by the types of the transition metal across the periodic table. For all oxidation reactions, Cr- and Mn-IrO₂ achieved the highest oxidation catalytic activity, and sequentially decreased activities were obtained with Fe, Co, and Ni doped IrO₂. For instance, the highest OER activity was achieved by Cr or Mn doping exhibiting the smallest overpotential ??=?275~230?mV at 10?mA/cm², while Ni-IrO₂ showed rather larger overpotential (??=?347?mV) even compared with non-doped IrO₂ (??=?314?mV). Scanning transmission X-ray microscopy and high-resolution photoemission spectra of TM-IrO₂ indicated dopant metals modified the Ir-O interaction and thus increasing oxygen vacancy defects in IrO₂. Strongly positive correlation was observed between the catalytic activities and vacancy states. The amount of defect related signals was observed the most for Cr- or Mn-IrO₂, less so for Fe- or Co-IrO₂, and unnoted for Ni-IrO₂ compared with bare IrO₂. Based on these catalytic activities and surface spectroscopic analysis results, vacancy defects induced by doping in TM-IrO₂ NPs are proposed to contribute to enhance the oxidation activities.

SUBMITTER: Lee H

PROVIDER: S-EPMC6233218 | biostudies-literature | 2018 Nov

REPOSITORIES: biostudies-literature

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Comparative study of catalytic activities among transition metal-doped IrO2 nanoparticles.

Lee Hangil H Kim Joo Yeon JY Lee Si Young SY Hong Jung A JA Kim Namdong N Baik Jaeyoon J Hwang Yun Jeong YJ

Scientific reports 20181113 1

Catalytic activities of transition metal-doped IrO2 nanoparticles (TM-IrO2 NPs; TM = Cr, Mn, Fe, Co, or Ni) are compared for various oxidation reactions such as electrochemical oxygen evolution reaction (OER), gas-phase photo-oxidation of thiol function group, and CO oxidative conversion. Here, we discovered a series of TM-IrO2 catalysts have a common activity trend for these oxidation reactions, and their activities are closely related with modified electronic s ...[more]

PMID: 30425306

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Project description:Highlights • The main properties of coordinated magnetic nanoparticles (MNPs) including magnetic moment and saturated magnetisation).• The doping of transition metal ions into ferrite to precisely modulate its magnetic properties.• the potential mechanisms and recent advances in transition metal ion-doped MNPs (TMNPs) for bioimaging: magnetic resonance imaging and magnetic particle imaging and tumour therapy: e.g., magneto-mechanical killing, magnetothermal therapy, and drug delivery.• the current challenges and future trends of TMNPs in the biomedical field based on the latest advances by researchers. Magnetic nanoparticles (MNPs) have been extensively researched and implemented in biomedicine for more than half a century due to their non-invasive nature, ease of temporal and spatial manipulation, and considerable biocompatibility. However, the complex magnetic behaviour of MNPs is influenced by several parameters (e.g., particle size, shape, composition, core-shell structure, etc.), among which the amount of transition metal doping plays an important factor. For this reason, the doping of ferrite with transition metals has been used as an effective strategy to precisely tailor MNPs to achieve satisfactory performance in biomedical applications. In this review, we first introduced the main properties of coordinated MNPs (including magnetic moment and saturated magnetisation) and provide a comprehensive overview of the mechanistic studies related to the doping of transition metal ions into ferrite to precisely modulate its magnetic properties. We also highlighted the potential mechanisms and recent advances in transition metal ion-doped MNPs (TMNPs) for bioimaging (magnetic resonance imaging and magnetic particle imaging) and tumour therapy (e.g., magneto-mechanical killing, magnetothermal therapy, and drug delivery). Finally, we summarised the current challenges and future trends of TMNPs in the biomedical field based on the latest advances by researchers. Graphical abstract Image, graphical abstractTransition metal doped magnetic nanoparticles (TMNPs) for biomedical applications

Dataset Information

Comparative study of catalytic activities among transition metal-doped IrO₂ nanoparticles.

Publications

Comparative study of catalytic activities among transition metal-doped IrO<sub>2</sub> nanoparticles.

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