Sustainable microwave-assisted hydrothermal synthesis of carbon-supported ZrO2 nanoparticles for H2O2 electrogeneration

Kronka, Matheus S.; Cordeiro-Junior, Paulo Jorge Marques; Mira, Letícia; Santos, Alexsandro J. dos; Fortunato, Guilherme V.; Lanza, Marcos R.V.

doi:10.1016/j.matchemphys.2021.124575

Cited by 20 publications

(1 citation statement)

References 60 publications

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“…The valance state and electron interaction of the constituting elements in CC/Co@NC/CoFe-LDH-700 were further investigated by XPS. It can be seen from the XPS full spectra in Figure S4 that there are mainly C, N, Co, Fe, and O elements in the CC/Co@NC/CoFe-LDH-700, agreeing with the element scanning results [ 47 , 48 , 49 ]. In Figure 3 a, the high-resolution C 1s spectra was deconvolved into four different functional carbons, corresponding to C-C at 283.8 eV, C-N at 284.4 eV, C-O at 285.2 eV, and C=O at 287.9 eV, respectively.…”

Section: Resultssupporting

confidence: 81%

Interfacial Engineering of Leaf-like Bimetallic MOF-Based Co@NC Nanoarrays Coupled with Ultrathin CoFe-LDH Nanosheets for Rechargeable and Flexible Zn-Air Batteries

Liu

Chen

et al. 2023

Polymers

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Exploring high-efficiency, low-cost, and long-life bifunctional self-supporting electrocatalysts is of great significance for the practical application of advanced rechargeable Zn-air batteries (ZABs), especially flexible solid-state ZABs. Herein, ultrathin CoFe-layered double hydroxide (CoFe-LDH) nanosheets are strongly coupled on the surface of leaf-like bimetallic metal-organic frameworks (MOFs)-derived hybrid carbon (Co@NC) nanoflake nanoarrays supported by carbon cloth (CC) via a facile and scalable method for rechargeable and flexible ZABs. This interfacial engineering for CoFe-LDHs on Co@NC improves the electronic conductivity of CoFe-LDH nanosheets as well as achieves the balance of oxygen evolution reduction (OER) and oxygen reduction reaction (ORR) activity. The unique three-dimensional (3D) open interconnected hierarchical structure facilitates the transport of substances during the electrochemical process while ensuring adequate exposure of OER/ORR active centers. When applied as an additive-free air cathode in rechargeable liquid ZABs, CC/Co@NC/CoFe-LDH-700 demonstrates high open-circuit potential of 1.47 V, maximum power density of 129.3 mW cm−2, and satisfactory specific capacity of 710.7 mAh g−1Zn. Further, the flexible all-solid-state ZAB assembled by CC/Co@NC/CoFe-LDH-700 displays gratifying mechanical flexibility and stable cycling performance over 40 h. More significantly, the series-connected flexible ZAB is further verified as a chain power supply for LED strips and performs well throughout the bending process, showing great application prospects in portable and wearable electronics. This work sheds new light on the design of high-performance self-supporting non-precious metal bifunctional electrocatalysts for OER/ORR and air cathodes for rechargeable ZABs.

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Section: Resultssupporting

confidence: 81%

Interfacial Engineering of Leaf-like Bimetallic MOF-Based Co@NC Nanoarrays Coupled with Ultrathin CoFe-LDH Nanosheets for Rechargeable and Flexible Zn-Air Batteries

Liu

Chen

et al. 2023

Polymers

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Understanding Advanced Transition Metal‐Based Two Electron Oxygen Reduction Electrocatalysts from the Perspective of Phase Engineering

Yang,

An,

Kang

et al. 2024

Advanced Materials

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Non‐noble transition metal (TM)‐based compounds have recently become a focal point of extensive research interest as electrocatalysts for the two electron oxygen reduction (2e− ORR) process. To efficiently drive this reaction, these TM‐based electrocatalysts must bear unique physiochemical properties, which are strongly dependent on their phase structures. Consequently, adopting engineering strategies toward the phase structure has emerged as a cutting‐edge scientific pursuit, crucial for achieving high activity, selectivity, and stability in the electrocatalytic process. This comprehensive review addresses the intricate field of phase engineering applied to non‐noble TM‐based compounds for 2e− ORR. First, the connotation of phase engineering and fundamental concepts related to oxygen reduction kinetics and thermodynamics are succinctly elucidated. Subsequently, the focus shifts to a detailed discussion of various phase engineering approaches, including elemental doping, defect creation, heterostructure construction, coordination tuning, crystalline design, and polymorphic transformation to boost or revive the 2e− ORR performance (selectivity, activity, and stability) of TM‐based catalysts, accompanied by an insightful exploration of the phase‐performance correlation. Finally, the review proposes fresh perspectives on the current challenges and opportunities in this burgeoning field, together with several critical research directions for the future development of non‐noble TM‐based electrocatalysts.This article is protected by copyright. All rights reserved

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LiOH Decomposition by NiO/ZrO₂ in Li‐Air Battery: Chemical Imaging with Operando Synchrotron Diffraction and Correlative Neutron/X‐Ray Computed‐Tomography Analysis

Anchieta,

Francisco,

Júlio

et al. 2024

Small Methods

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Li‐air batteries attract significant attention due to their highest theoretical energy density among all existing energy storage technologies. Currently, challenges related to extending lifetime and long‐term stability limit their practical application. To overcome these issues and enhance the total capacity of Li‐air batteries, this study introduces an innovative approach with NiO/ZrO2 catalysts. Operando advanced chemical imaging with micrometer spatial resolution unveils that NiO/ZrO2 catalysts substantially change the kinetics of crystalline lithium hydroxide (LiOH) formation and facilitate its rapid decomposition with heterogeneous distribution. Moreover, ex situ combined neutron and X‐ray computed tomography (CT) analysis, provide evidence of distinct lithium phases homogeneously distributed in the presence of NiO/ZrO2. These findings underscore the material's superior physico‐chemical and electronic properties, with more efficient oxygen diffusion and indications of lower obstruction to its active sites, avoiding clogging in the active electrode, a common cause of capacity loss. Electrochemical tests conducted at high current density demonstrated a significant kinetic enhancement of the oxygen reduction and evolution reactions, resulting in improved charge and discharge processes with low overpotential. This pioneering approach using NiO/ZrO2 catalysts represents a step toward on developing the full potential of Li‐air batteries as high‐energy‐density energy storage systems.

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Sustainable microwave-assisted hydrothermal synthesis of carbon-supported ZrO2 nanoparticles for H2O2 electrogeneration

Cited by 20 publications

References 60 publications

Interfacial Engineering of Leaf-like Bimetallic MOF-Based Co@NC Nanoarrays Coupled with Ultrathin CoFe-LDH Nanosheets for Rechargeable and Flexible Zn-Air Batteries

Interfacial Engineering of Leaf-like Bimetallic MOF-Based Co@NC Nanoarrays Coupled with Ultrathin CoFe-LDH Nanosheets for Rechargeable and Flexible Zn-Air Batteries

Understanding Advanced Transition Metal‐Based Two Electron Oxygen Reduction Electrocatalysts from the Perspective of Phase Engineering

LiOH Decomposition by NiO/ZrO₂ in Li‐Air Battery: Chemical Imaging with Operando Synchrotron Diffraction and Correlative Neutron/X‐Ray Computed‐Tomography Analysis

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Sustainable microwave-assisted hydrothermal synthesis of carbon-supported ZrO2 nanoparticles for H2O2 electrogeneration

Cited by 20 publications

References 60 publications

Interfacial Engineering of Leaf-like Bimetallic MOF-Based Co@NC Nanoarrays Coupled with Ultrathin CoFe-LDH Nanosheets for Rechargeable and Flexible Zn-Air Batteries

Interfacial Engineering of Leaf-like Bimetallic MOF-Based Co@NC Nanoarrays Coupled with Ultrathin CoFe-LDH Nanosheets for Rechargeable and Flexible Zn-Air Batteries

Understanding Advanced Transition Metal‐Based Two Electron Oxygen Reduction Electrocatalysts from the Perspective of Phase Engineering

LiOH Decomposition by NiO/ZrO2 in Li‐Air Battery: Chemical Imaging with Operando Synchrotron Diffraction and Correlative Neutron/X‐Ray Computed‐Tomography Analysis

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LiOH Decomposition by NiO/ZrO₂ in Li‐Air Battery: Chemical Imaging with Operando Synchrotron Diffraction and Correlative Neutron/X‐Ray Computed‐Tomography Analysis