Laser Synthesis of Iridium Nanospheres for Overall Water Splitting

Wang, Haibin; Wang, Jiaqi; Mintcheva, Neli; Wang, Min; Li, Shuang; Mao, Jing; Liu, Hui; Dong, Cunku; Kulinich, Sergei A.; Du, Xi‐Wen

doi:10.3390/ma12183028

Cited by 20 publications

(19 citation statements)

References 42 publications

(62 reference statements)

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“…In case of chemically inert metals, no reaction occurs, and bare metal NPs are produced [6][7][8][9]. The extremely high temperature gradient and quenching rates created in the reaction zone during LAL often lead to the formation of metastable phases or unique morphologies of nanomaterials, as well as defect-rich surfaces, which are the main reasons for the potential attractiveness of LAL-produced nanomaterials for catalysis and photocatalysis [7][8][9][10], optics and optoelectronics, sensing, and biomedical applications [1][2][3][4][5][6][11][12][13][14][15].…”

Section: Introductionmentioning

confidence: 99%

Hybrid TiO2-ZnO Nanomaterials Prepared Using Laser Ablation in Liquid

2020

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Hybrids of semiconductor nanomaterials often demonstrate properties that are superior to those of their components. In this study, we prepared hybrid nanomaterials of TiO2 and ZnO, which are among the most actively studied semiconductors, by means of millisecond-pulsed laser and analyzed how their morphology, particle size, and surface composition depend on preparation conditions. A series of nanomaterials were obtained via sequentially ablating Zn and Ti metal plates (in different sequences) in water, while laser pulses of lower (2.0 J/pulse) and higher (5.0 J/pulse) energy were applied. The properties of laser-produced hybrid TiO2-ZnO nanomaterials were shown to be governed by experimental conditions such as laser pulse width, pulse peak power, and reaction media (either pure water or colloid with nanoparticles). The morphology revealed nanospheres of TiO2 that decorate nanorods of ZnO or flower-like aggregates of zinc oxide. Intriguingly, after extended ablation time, titania was found to be self-doped with Ti3+ and Ti2+ ions, and the contribution of lower oxidation states of titanium could be controlled by the applied laser pulse energy. The physicochemical characteristics of hybrid nanomaterials were compared with pure ZnO and TiO2 prepared under the same laser conditions.

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Section: Introductionmentioning

confidence: 99%

Hybrid TiO2-ZnO Nanomaterials Prepared Using Laser Ablation in Liquid

2020

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“…Hence, in order to overcome the high activation barrier of OER, a large overpotential ( η ) is needed in order to practically produce H 2 [ 8 ]. Currently, catalysts based on noble metals such as IrO 2 , RuO 2 and Pt are widely applied to support hydrogen evolution (cathode) and oxygen evolution (anode) reactions because they can provide high current densities [ 9 , 10 , 11 , 12 , 13 ]. However, these catalysts are expensive, rare and have an unstable catalytic performance.…”

Section: Introductionmentioning

confidence: 99%

Construction of FeCo2O4@N-Doped Carbon Dots Nanoflowers as Binder Free Electrode for Reduction and Oxidation of Water

et al. 2020

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Electrochemical water splitting is known as a potential approach for sustainable energy conversion; it produces H2 fuel by utilizing transition metal-based catalysts. We report a facile synthesis of FeCo2O4@carbon dots (CDs) nanoflowers supported on nickel foam through a hydrothermal technique in the absence of organic solvents and an inert environment. The synthesized material with a judicious choice of CDs shows superior performance in hydrogen and oxygen evolution reactions (HER and OER) compared to the FeCo2O4 electrode alone in alkaline media. For HER, the overpotential of 205 mV was able to produce current densities of up to 10 mA cm−2, whereas an overpotential of 393 mV was needed to obtain a current density of up to 50 mA cm−2 for OER. The synergistic effect between CDs and FeCo2O4 accounts for the excellent electrocatalytic activity, since CDs offer exposed active sites and subsequently promote the electrochemical reaction by enhancing the electron transfer processes. Hence, this procedure offers an effective approach for constructing metal oxide-integrated CDs as a catalytic support system to improve the performance of electrochemical water splitting.

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“…6 Not limited to the Ir single-atoms or nanoparticles, the rational designs of Ir-based alloys, oxides, or other nanocomposites are also important to further applications. According to the recent reports, the syntheses of Irbased electrocatalysts can be achieved by hydrothermal method, 7 impregnation, 8 wet chemical reduction, 2,9,10 colloidal method, 11 carbonization, 12 laser etching, 13 electrochemical deposition method, 14 microwave-assisted method, 15 spray freeze drying method, 16,17 sol-gel method, 18 and pyrolysis treatment. [19][20][21][22][23] By these nanoengineering methods, various Ir-based electrocatalysts with desired structures can be successfully designed.…”

Section: Introductionmentioning

confidence: 99%

Iridium‐based electrocatalysts toward sustainable energy conversion

Huang

Zhao

2022

EcoMat

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Electrocatalysis is an important branch in electrochemistry and also has a significant position in energy storage/conversion. Iridium (Ir)-based electrocatalysts show promise because of the inherent redox property. Considering the abundance and expensive cost of such noble metal, significant efforts have been made to rationally improve the electrochemical performance of Ir-based electrocatalysts during these years from the viewpoints of structural design and kinetic analysis. Most of the reports may aim to achieve high Ir atomic utilization with more exposed active sites, and both high electrochemical activity and durable stability are expected. In this case, Ir-based single atoms, nanostructures, and composites are reported with various electrocatalytic applications of water splitting (involving hydrogen evolution and oxygen evolution reaction) and other electrocatalytic oxidation reactions (involving hydrogen oxidation reaction, methanol oxidation reaction, ammonia oxidation reaction, and formic acid oxidation reaction) as well as other electrocatalytic reduction reactions (involving oxygen reduction reaction, carbon dioxide reduction reaction, and nitrogen reduction reaction). These works deserve to be discussed and this review article comprehensively summarized the most significant reports. We analyzed Ir-based electrocatalysts from the viewpoints of synthesis, structure, electrochemical property, and reaction mechanism. The challenges and outlooks in the future were also provided from the aspects of fundamental studies and industrial applications, which may attract more attention and provide new insight into the design of advanced Ir-based electrocatalysts with high performance.

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Laser Synthesis of Iridium Nanospheres for Overall Water Splitting

Cited by 20 publications

References 42 publications

Hybrid TiO2-ZnO Nanomaterials Prepared Using Laser Ablation in Liquid

Hybrid TiO2-ZnO Nanomaterials Prepared Using Laser Ablation in Liquid

Construction of FeCo2O4@N-Doped Carbon Dots Nanoflowers as Binder Free Electrode for Reduction and Oxidation of Water

Iridium‐based electrocatalysts toward sustainable energy conversion

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