The structural and dynamic heterogeneities of Ni-P nanoglass characterized by stress-relaxation

Pei, Chaoqun; Zhao, R.; Fang, Yong; Wu, Shangshu; Cui, Zhaotao; Sun, Baoan; Lan, Si; Luo, P.; Feng, Tao

doi:10.1016/j.jallcom.2020.155506

Cited by 11 publications

(4 citation statements)

References 38 publications

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“…Figure 6(a) exhibits the plot of log( ) vs. log(t) in the creep measurement performed at 403 K under applied stress of 50 MPa, showing a two-stage powerlaw. The intersection of the two lines defines as crossover time τ c = 310 s. This crossover between two relaxations has also been reported in dielectric materials [70] and stress relaxation tests in MGs [71][72][73][74]. According to molecular dynamics simulations, the power-law creep in glassy systems is correlated to the percolation dynamics of soft regions [75].…”

Section: Creep Testssupporting

confidence: 61%

Dynamic mechanical relaxation and thermal creep of high-entropy La30Ce30Ni10Al20Co10 bulk metallic glass

Zhang

Duan

Crespo

et al. 2021

Sci. China Phys. Mech. Astron.

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Dynamic mechanical relaxation is a fundamental tool to understand the mechanical and physical properties of viscoelastic materials like glasses. Mechanical spectroscopy shows that the high-entropy bulk metallic glass (La 30 Ce 30 Ni 10 Al 20 Co 10 ) exhibits a distinct β-relaxation feature. In the present research, dynamic mechanical analysis and thermal creep were performed using this bulk metallic glass material at a temperature domain around the β relaxation. The components of total strain, including ideal elastic strain, anelastic strain, and viscous-plastic strain, were analyzed based on the model of shear transformation zones (STZs). The stochastic activation of STZ contributes to the anelastic strain. When the temperature or external stress is high enough or the timescale is long enough, the interaction between STZs induces viscous-plastic strain. When all the spectrum of STZs is activated, the quasi-steady-state creep is achieved.

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Section: Creep Testssupporting

confidence: 61%

Dynamic mechanical relaxation and thermal creep of high-entropy La30Ce30Ni10Al20Co10 bulk metallic glass

Zhang

Duan

Crespo

et al. 2021

Sci. China Phys. Mech. Astron.

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“…[47] Wang et al [46] confirmed that MG could also produce plastic flow when loading in the elastic region, and found that mechanical relaxation behavior of MG affects the degree of flow. Therefore, stress-relaxation [48] is adapted to express the flow units of the Ni-P NG and MG by dynamical mechanical analyzer (DMA), as shown in Figure 2b. The time dependent stress curves σ(t)/σ(0) show that the stress decays with increasing time both for NG (red dot) and MG (black dot).…”

Section: Resultsmentioning

confidence: 99%

Nanostructured Metallic Glass in a Highly Upgraded Energy State Contributing to Efficient Catalytic Performance

et al. 2022

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Metallic glasses (MGs), with high density of low coordination sites and high Gibbs free energy state, are novel promising and competitive candidates in the family of electrochemical catalysts. However, it remains a grand challenge to modify the properties of MGs by control of the disordered atomic structure. Recently, nanostructured metallic glasses (NGs), consisting of amorphous nanometer‐sized grains connected by amorphous interfaces, have been reported to exhibit tunable properties compared to the MGs with identical chemical composition. Here, it is demonstrated that electrodeposited Ni–P NG is characterized by an extremely high energy state due to its heterogeneous structure, which significantly promotes the catalytic performance. Moreover, the Ni–P NG with a heterogeneous structure is a perfect precursor for the fabrication of unique honey‐like nanoporous structure, which displays superior catalytic performance in the urea oxidation reaction (UOR). Specifically, modified Ni–P NG requires a potential of mere 1.36 V at 10 mA cm–2, with a Tafel slope of 13 mV dec–1, which is the best UOR performance in Ni‐based alloys. The present work demonstrates that the nanostructurization of MGs provides a universal and effective pathway to upgrade the energy state of MGs for the design of high‐performance catalysts in energy conversion.

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“…The Ni–P HPNG is fabricated by a facile two-step method by pulse electrodeposition and dealloying as shown in Figure a. Ni–P NG with high structural heterogeneity can be prepared by pulse electrodeposition. ,− Nickel foam (NF) is selected as the substrate due to its good electrical conductivity, large surface area, and low cost, which is very suitable for industrial application as an electrode substrate. Then, the method of pulse electrodeposition (microporous scaled NF is used as the substrate) is adopted to obtain the NG/NF sample with a current density of 37.5 mA cm –2 at a temperature of 50 °C in an acid electrolyte environment for 1 h. Because of the high structural heterogeneity of Ni–P NG, a unique honeycomb-like nanoporous structure can be formed by etching in 3.5 wt % NaCl solution, i.e., dealloying .…”

Section: Resultsmentioning

confidence: 99%

Direct Urea/H₂O₂ Fuel Cell with a Hierarchical Porous Nanoglass Anode for High-Efficiency Energy Conversion

Pei

Chen

Zhou

et al. 2023

ACS Appl. Mater. Interfaces

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Direct urea/H 2 O 2 fuel cells (DUFCs) constitute a sustainable bifunctional energy conversion technique devoted to simultaneously eliminating environmental wastewater with urea and generating clean energy. However, exploring an efficient anode material for DUFCs still remains a huge challenge. In this work, a Ni−P hierarchical porous nanoglass (HPNG) catalytic electrode was developed via a low-cost, industrially available electrodeposition technique, which exhibits one of the best performances reported so far in the urea oxidation reaction (UOR), with a potential of 1.330 V at a current density of 10 mA cm −2 and a Tafel slope of 9.77 mV dec −1 . The superior UOR performance of the HPNG electrode is attributed to the excellent intrinsic catalytic activity of NG with a high-energy state and an extremely enlarged surface area from the unique 3D hierarchical porous structure. Furthermore, a DUFC system with the HPNG anode shows a performance breakthrough as indicated by the maximum power density of 38.15 mW cm −2 for 0.5 M urea, representing one of the best yet reported DUFCs. Our work demonstrates the feasibility of the scalable production of HPNG electrodes and is expected to be a great contribution to the development of the practical use of DUFCs in the near future for bifunctional energy conversion.

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The structural and dynamic heterogeneities of Ni-P nanoglass characterized by stress-relaxation

Cited by 11 publications

References 38 publications

Dynamic mechanical relaxation and thermal creep of high-entropy La30Ce30Ni10Al20Co10 bulk metallic glass

Dynamic mechanical relaxation and thermal creep of high-entropy La30Ce30Ni10Al20Co10 bulk metallic glass

Nanostructured Metallic Glass in a Highly Upgraded Energy State Contributing to Efficient Catalytic Performance

Direct Urea/H₂O₂ Fuel Cell with a Hierarchical Porous Nanoglass Anode for High-Efficiency Energy Conversion

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The structural and dynamic heterogeneities of Ni-P nanoglass characterized by stress-relaxation

Cited by 11 publications

References 38 publications

Dynamic mechanical relaxation and thermal creep of high-entropy La30Ce30Ni10Al20Co10 bulk metallic glass

Dynamic mechanical relaxation and thermal creep of high-entropy La30Ce30Ni10Al20Co10 bulk metallic glass

Nanostructured Metallic Glass in a Highly Upgraded Energy State Contributing to Efficient Catalytic Performance

Direct Urea/H2O2 Fuel Cell with a Hierarchical Porous Nanoglass Anode for High-Efficiency Energy Conversion

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Direct Urea/H₂O₂ Fuel Cell with a Hierarchical Porous Nanoglass Anode for High-Efficiency Energy Conversion