Laser solid-phase synthesis of single-atom catalysts

Peng, Yudong; Cao, Jianyun; Sha, Yang; Yang, William; Li, Lin; Li, Zhu

doi:10.1038/s41377-021-00603-9

Cited by 39 publications

(37 citation statements)

References 52 publications

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“…The D band located at ≈1350 cm −1 corresponds to disordered structures, the G band at ≈1580 cm −1 is induced by the ordered sp 2 hybridized carbon. [34,35] In addition, characteristic band at 561 cm −1 of NiFe nanoparticles can also be observed from Raman spectra, [36] demonstrating the coexistence of NiFe nanoparticles and HPLIG, which is in agreement with the TEM and XRD results described earlier. It is obvious that proper increment of laser fluence results in decreased ID/IG value and increased intensity of 2D peak, indicating the improvement of graphitization degree of HPLIG, which is beneficial for electronic conduction.…”

Section: Preparation and Characterization Of Iessupporting

confidence: 87%

“…HAADF‐STEM images and EDS mapping results also confirm the resultant tiny Co oxide nanoparticles are uniformly distributed on N doped 3D interconnected HPLIG (Figure S17, Supporting Information). As can be seen from Figure S18, Supporting Information, Raman characteristic bands at ≈194, ≈479, and ≈686 cm −1 of Co oxide nanoparticles [ 37 ] and ≈1350, ≈1580, and ≈2700 cm −1 of graphene can be observed, [ 34,35 ] confirming the coexistence of Co oxide nanoparticles and HPLIG. XRD was conducted and verified the successful synthesis of Co/HPLIGIE as well (Figure S19, Supporting Information).…”

Section: Resultsmentioning

confidence: 88%

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3D Binder‐free Integrated Electrodes Prepared by Phase Separation and Laser Induction (PSLI) Method for Oxygen Electrocatalysis and Zinc–Air Battery

Sha

Peng

Huang

et al. 2022

Advanced Energy Materials

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Developing facile approaches to fit in large‐scale fabrication of efficient and durable catalytic electrodes is highly desirable for oxygen electrocatalysis and metal–air batteries. Herein, a strategy based on phase separation and laser induction is proposed to prepare 3D binder‐free integrated electrodes (IEs). The phase separation between a polybenzimidazole (PBI) solution and a coagulation bath containing metal precursors occurs to form a 3D interconnected porous catalyst precursor layer. After drying, IEs are obtained by laser induction, which simultaneously converts PBI into hierarchically porous laser‐induced graphene (HPLIG) and reduces metal precursor to tiny nanoparticles. To demonstrate the versatility of this method, IEs with different HPLIG hybrid catalyst layers and substrates are fabricated. IE‐NiFe/HPLIG and IE‐Co/HPLIG using carbon paper as a substrate exhibit superior oxygen evolution reaction (OER) and oxygen reduction reaction (ORR) performance respectively. Flexible IE‐NiCoFe/HPLIG with OER and ORR bifunctionality using carbon cloth as the substrate is applied as an air cathode in rechargeable aqueous Zinc–air batteries (ZABs) and provides a satisfactory power density of 163 mW cm−2 and cycling stability of 1800 h at 10 mA cm−2. The electrode also endows solid ZABs with good flexibility. This work offers an industrially viable solution to the challenge of rapid fabrication of IEs.

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Section: Preparation and Characterization Of Iessupporting

confidence: 87%

Section: Resultsmentioning

confidence: 88%

3D Binder‐free Integrated Electrodes Prepared by Phase Separation and Laser Induction (PSLI) Method for Oxygen Electrocatalysis and Zinc–Air Battery

Sha

Peng

Huang

et al. 2022

Advanced Energy Materials

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“…[90] Conversely, optical oxidation of 2D materials [20][21][22]41,64,87,88,92] has been demonstrated with two-photon oxidation, [20,21,41] heat-induced strain and oxygen binding, [92] light interaction with humidity, [87] and laser-induced chalcogen transfer. [88] The processes can be controlled with laser wavelength, [23,35,[89][90][91]103] power, [88] irradiation time, [20,41] and scanning speed [91] as well as environment. [87] The greatest benefits of the methods are LDW of conducting and insulating microcircuits [23,91] (Figure 4c), due to its highly local bandgap engineering capability with modulation up to ±1.5 eV.…”

Section: Reduction and Oxidationmentioning

confidence: 99%

Optical Modification of 2D Materials: Methods and Applications

2022

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on the same chip, which is promising for integrated electronics or photonics applications, [7] such as lasers, [8][9][10] optical modulators, [11] and photodetectors. [12] Indeed, 2D materials are an excellent candidate for postsilicone electronics due to their unique properties, versatile scaling of channel length, reduced device dimensionalities, and the possibility of creating circuits nearly at the atomic level. [13] Currently, some of the biggest challenges for 2D material synthesis include the lack of large-scale manufacturing and the necessity of harsh or arduous microand nanofabrication methods. Typical fabrication methods are based on chemical vapor deposition (CVD) and mechanical exfoliation from bulk crystals. The former involves a process that results in layers with relatively high concentrations of atomic impurities, [14] and the latter is limited in producing large area flakes. [14] Further fabrication steps for the incorporation of 2D materials into integrated devices typically require processes like electron-beam lithography and reactive ion etching, [15] both of which can be harmful to flakes that are atomically thin.All-optical processing of 2D materials has been demonstrated to overcome limitations of the conventional synthesis methods. It is time-and cost-effective, and it is also a promising fabrication alternative over CVD and mechanical exfoliation. Optical modification processes offer selectivity, locality, directionality, tunability, less harmful conditions, and on-demand functionalities, such as optical doping, [16][17][18][19] oxidation, [20][21][22][23] optical thinning, [24][25][26][27][28] and phase change. [29][30][31][32] Additionally, almost all of the optical modification and fabrication methods can be used for laser-direct writing (LDW) of patterns and structures at the microscale. [33][34][35][36] The high precision of LDW is particularly advantageous in the evolving world of nanofabrication. Lasers allow local modification of 2D material electronic bandgap, [37] thickness, [25] strain, [33,[38][39][40] and chemical composition, [19,41,42] even beyond the diffraction limit. [33] The created structures and patterns can often be directly used for applications in sensors, [22] energyprocessing devices, [43] and holography [44] (Figure 1). All the major demonstrations using LDW on 2D materials are listed in Table 1. Here, we review the optically assisted synthesis and fabrication methods of 2D materials, and their state-of-theart applications, providing detailed descriptions and features of optically engineered devices using 2D materials. We have straightforwardly introduced light-matter interactions and 2D-material-light interactions, and we also present our perspectives on this emerging field.2D materials are under extensive research due to their remarkable properties suitable for various optoelectronic, photonic, and biological applications, yet their conventional fabrication methods are typically harsh and costineffective. Optical modification is demonstrated as an effective an...

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“…In turn, a laser-induced cation doping of colloidal nanoparticles by pulsed laser post-processing (PLPP) with single laser pulses and the correlation of such a surface doping with the catalytic activity still is an open field. Hereby, PLPP holds particular opportunities since it has been reported to kinetically stabilize catalysis-relevant metastable structures such as amorphous, , defective, and/or single-atom catalysts while maintaining the particle size and oxide phase when choosing a sufficient laser intensity regime. , …”

Section: Introductionmentioning

confidence: 99%

Gradually Fe-Doped Co₃O₄ Nanoparticles in 2-Propanol and Water Oxidation Catalysis with Single Laser Pulse Resolution

et al. 2022

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Controlling the surface composition of colloidal nanoparticles is still a challenging yet mandatory prerequisite in catalytic studies to investigate composition-activity trends, active sites, and reaction mechanisms without superposition of particle size or morphology effects. Laser post-processing of colloidal nanoparticles has been employed previously to create defects in oxide nanoparticles, while the possibility of laser-based cation doping of colloidal nanoparticles without affecting their size remains mostly unaccounted for. Consequently, at the example of doping iron into colloidal Co 3 O 4 spinel nanoparticles, we developed a pulse-bypulse laser cation doping method to provide a catalyst series with a gradually modified surface composition but maintained extrinsic properties such as phase, size, and surface area for catalytic studies. Laser pulse number-resolved doping series were prepared at a laser intensity chosen to selectively heat the Co 3 O 4 -NPs to roughly 1000 K and enable cation diffusion of surface-adsorbed Fe 3+ into the Co 3 O 4 lattice. The combination of bulk-sensitive X-ray fluorescence and surface-sensitive X-ray photoelectron spectroscopy was used to confirm the surface enrichment of the Fe-dopant. X-ray diffraction, magnetometry, and Mossbauer spectroscopy revealed an increasing interaction between Fe and the antiferromagnetic Co 3 O 4 with arising number of applied laser pulses, in line with a herein proposed laser-induced surface doping of the colloidal Co 3 O 4 nanoparticles with Fe. Using Fick's second law, the thermal diffusionrelated doping depth was estimated to be roughly 2 nm after 4 laser pulses. At the example of gas-phase 2-propanol oxidation and liquid-phase oxygen evolution reaction, the activity of the laser-doped catalysts is in good agreement with previous activity observations on binary iron-cobalt oxides. The catalytic activity was found to linearly increase with the calculated doping depth in both reactions, while only catalysts processed with at least one laser pulse were catalytically stable, highlighting the presented method in providing comparable, active, and stable gradual catalyst doping series for future catalytic studies.

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Laser solid-phase synthesis of single-atom catalysts

Cited by 39 publications

References 52 publications

3D Binder‐free Integrated Electrodes Prepared by Phase Separation and Laser Induction (PSLI) Method for Oxygen Electrocatalysis and Zinc–Air Battery

3D Binder‐free Integrated Electrodes Prepared by Phase Separation and Laser Induction (PSLI) Method for Oxygen Electrocatalysis and Zinc–Air Battery

Optical Modification of 2D Materials: Methods and Applications

Gradually Fe-Doped Co₃O₄ Nanoparticles in 2-Propanol and Water Oxidation Catalysis with Single Laser Pulse Resolution

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Laser solid-phase synthesis of single-atom catalysts

Cited by 39 publications

References 52 publications

3D Binder‐free Integrated Electrodes Prepared by Phase Separation and Laser Induction (PSLI) Method for Oxygen Electrocatalysis and Zinc–Air Battery

3D Binder‐free Integrated Electrodes Prepared by Phase Separation and Laser Induction (PSLI) Method for Oxygen Electrocatalysis and Zinc–Air Battery

Optical Modification of 2D Materials: Methods and Applications

Gradually Fe-Doped Co3O4 Nanoparticles in 2-Propanol and Water Oxidation Catalysis with Single Laser Pulse Resolution

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Product

Resources

About

Gradually Fe-Doped Co₃O₄ Nanoparticles in 2-Propanol and Water Oxidation Catalysis with Single Laser Pulse Resolution