List of high-quality authors
In order to better move into the future, we have carefully selected the scientific results achieved in the field of nanotechnology using in-situ heating sample holders in 2023 (as of December 10). These documents come from Anhui University, Beijing University of Technology, Tsinghua University and Nanchang University, etc., opening up a broader research horizon for us and revealing a new chapter in the field of innovation!
Ref. 1
Author: Ge Binghui, Anhui University, et al
Title: approaching elaborate control of the nano products of carbothermal reduction reaction through in situ identification
Journal: small 19(15): 2206404
Abstract:Understanding chemical reactions at the atomic level enables the custom design and synthesis of products with specific components. By directly monitoring the phase transitions of reactions and tracking atomic dynamics, in-situ TEM techniques make it possible to reveal reaction kinetics at the atomic level, but it remains challenging, especially for reactions involving heterogeneous and complex interfaces, such as the widely used carbon-thermal reduction (CTR) reaction. In this work, in-situ TEMs were employed to monitor the CTR reactions of CO3O4 nanocubes on reduced graphene oxide nanosheets. Combined with first-principles calculations, the migration path of cobalt atoms during the phase transition of the CTR reaction is revealed. At the same time, atomic diffusion leads to a dislocation stress gradient at the edge of the interface, which in turn affects the morphological change of the reactants. So far, the controlled synthesis of cobalt-based nanostructures with the desired phase and structure has been realized. This work not only provides insights into the atomic dynamics of CTR reactions, but also provides a new idea for the design and synthesis of nanostructures in new energy technologies.
System used -Wildfire Heating Rod: Using WildFire in-situ heating of the sample holder, the research team was able to heat the sample area in a TEM to study the carbon-thermal reduction reaction of CO3O4 nanocubes at different temperatures.
Ref. 2
Author: Ke Xiaoxing, Beijing University of Technology, et al
Title: Novel approach of diffusion controlled sequential reduction to synthesize dual atomic site alloy for enhanced bifunctional electrocatalysis in acidic and alkaline media
Journal: Advanced Functional Materials: 2308876
Abstract:The customization of the active site is closely related to the substrate material. Diatomic catalysts have been implemented on doped carbon, oxides, and two-dimensional materials, but there are few reports due to the challenges of sintering and alloying when using metals as hosts. The team proposed a new method for anchoring isolated single atoms to diatomic alloys through two-step pyrolysis of porous structures. First, the team revealed the role of zinc and cobalt in the formation of pores during the pyrolysis of the zeolite imidazolate matrix, and achieved a hierarchical porous structure with self-supporting cobalt particles through the first step of pyrolysis. Then, the second step is pyrolysis, which solves the challenges of sintering and alloying under high-temperature pyrolysis by diffusion-controlled reduction of the precursor containing the target metal through a hierarchical structure. The ir1ni1@co n-c diatomic spot alloys synthesized by this method have excellent bifunctional oxygen reduction precipitation performance in both acidic and alkaline media, which is rarely reported. DFT calculations show that the adsorption energy of the intermediates OH and O is regulated to close to 0 EV by IR1 and Ni1 on cobalt. This work demonstrates a new method for constructing diatomic point alloys using porous structures, and inspires catalyst design in related fields.
System used - Wildfire Heating Rod: Using WildFire in-situ heating of the sample holder, the research team was able to heat the sample area in the TEM microscope, enabling the fabrication of a metal-hosted diatomic catalyst.
Ref. 3
Author: Li Yadong, Tsinghua University, et al
Title: Self-carbon-thermal-reduction strategy for boosting the fenton-like activity of single fe-n4 sites by carbon-defect engineering
Journal: Nature Communications 14(1): 7549
Abstract:It is meaningful but challenging to treat the carbon defects of metal single-atom catalysts by a simple and reliable method to improve their catalytic activity and reveal the relationship between carbon defects and catalytic activity. The team reported a simple method for spontaneous carbon-thermal reduction of a single Fe-N4 site in a Zno-C nanoreactor for carbon defects as an effective catalyst for phenol degradation in a Fenton-like reaction. During synthesis, carbon vacancies are readily generated near a single Fe-N4 site, which promotes the formation of C-O bonds and reduces the energy barrier of rate-determining steps in phenol degradation. As a result, the catalyst Fe-NCV-900 with carbon vacancies exhibited higher activity than Fe-NC-900 without carbon vacancies, and the first-order rate constant for phenol degradation was increased by 135 times. Fe-NCV-900 has high activity (97% phenol removal in only 5 minutes), good availability, broad pH versatility (pH range 3-9). This work not only provides a reasonable idea for improving the Fenton-like activity of metal single-atom catalysts, but also deepens the basic understanding of how the external carbon environment affects the properties and properties of the metal-N4 site.
System used- Wildfire Heating Rod: Using Wildfire in-situ heating of the sample holder, the research team could treat a single Fe-N4 site in the ZNO-C nanoreactor with carbon defects in TEM and study changes in its catalytic activity.
Ref. 4
Author: Fei Linfeng, Nanchang University, et al
Title: Encapsulated AG2se-based Flexible Thermoelectric Generator with Remarkable Performance
Journal: Materials Today Physics: 101276
Abstract:Flexible thermoelectric generators have great application potential in powering wearable electronics. The team used a novel encapsulation technique to prepare an AG2SE-based composite film with 25Excellent room temperature power factor of 6 w·cm-1k-2 and peak power factor of about 27 w·cm-1k-2 (at 380 k). In situ TEM results confirmed that the microscopic origin of the above properties was attributed to the emergence of the Cuagse second phase. In addition, the new package guarantees that the AG2SE layer is in a strain-free state, and the relative resistance change is negligible (<0.) even after 2000 bending cycles at a bend radius of 3 mmThe encapsulated flexible generator assembled by six AG2SE legs has a maximum power density of 130 W·m-2 at a temperature difference of 60 K and is able to withstand harsh operating environments.
System used - WildFire Heating Rod: Using the WildFire in-situ heating of the sample holder, the research team was able to study the performance of the newly encapsulated AG2SE-based composite thin-film flexible battery at different temperatures.