Strain-Induced Reverse Phase Transformation in Nanocrystalline Co-Ni Alloys

Li, J.Y.; Li, W.; Jin, Min; Jin, Xuejun

doi:10.1080/21663831.2014.989460

Cited by 5 publications

(5 citation statements)

References 38 publications

(43 reference statements)

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“…Even in systems in which some degree of homogeneity is expected, extrapolations and generalizations may become inaccurate with the complexity of the underlying chemical processes. Ni and Co form alloys in a large interval of atomic compositions [156]. However, the alloy undergoes a phase transition from hcp to fcc structures with increasing temperatures.…”

Section: The Metallic Phasementioning

confidence: 99%

Quo Vadis Dry Reforming of Methane?—A Review on Its Chemical, Environmental, and Industrial Prospects

2022

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In recent years, the catalytic dry reforming of methane (DRM) has increasingly come into academic focus. The interesting aspect of this reaction is seemingly the conversion of CO2 and methane, two greenhouse gases, into a valuable synthesis gas (syngas) mixture with an otherwise unachievable but industrially relevant H2/CO ratio of one. In a possible scenario, the chemical conversion of CO2 and CH4 to syngas could be used in consecutive reactions to produce synthetic fuels, with combustion to harness the stored energy. Although the educts of DRM suggest a superior impact of this reaction to mitigate global warming, its potential as a chemical energy converter and greenhouse gas absorber has still to be elucidated. In this review article, we will provide insights into the industrial maturity of this reaction and critically discuss its applicability as a cornerstone in the energy transition. We derive these insights from assessing the current state of research and knowledge on DRM. We conclude that the entire industrial process of syngas production from two greenhouse gases, including heating with current technologies, releases at least 1.23 moles of CO2 per mol of CO2 converted in the catalytic reaction. Furthermore, we show that synthetic fuels derived from this reaction exhibit a negative carbon dioxide capturing efficiency which is similar to burning methane directly in the air. We also outline potential applications and introduce prospective technologies toward a net-zero CO2 strategy based on DRM.

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Section: The Metallic Phasementioning

confidence: 99%

Quo Vadis Dry Reforming of Methane?—A Review on Its Chemical, Environmental, and Industrial Prospects

2022

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“…39,40 The Co−Ni phase diagram indicates that the hardness of CoNi alloys increases as the cobalt content increases. 41,42 Thus, increasing the cobalt content in the crystal is beneficial for the stability of the structure. ICP-OES and EDS were used to analyze the proportion of Co, Ni, and Fe and the average metal weight percent of bare and carbonized CoNiFe-MOF-74 (Table S1).…”

Section: ■ Results and Discussionmentioning

confidence: 99%

“…04-0850 for fcc Ni). 42,43 The characteristics peaks of Fe 3 O 4 are located at 2θ = 18.4, 30.30, 35.53, 43.02, 53.59, and 57.53°, which correspond to the (111), ( 220), (311), (400), (422), and (511) crystal planes of Fe 3 O 4 (JCPDS no. 65-3107).…”

Section: ■ Results and Discussionmentioning

confidence: 99%

“…The synthetic process of CoNiFe 3 O 4 /PC was targeted with an atom ratio of Co/Ni (Fe) ∼ 2:1 to obtain CoNi alloy with the highest fcc-phase strength based on the Co–Ni–Fe phase diagram. , The Co–Ni phase diagram indicates that the hardness of CoNi alloys increases as the cobalt content increases. , Thus, increasing the cobalt content in the crystal is beneficial for the stability of the structure. ICP-OES and EDS were used to analyze the proportion of Co, Ni, and Fe and the average metal weight percent of bare and carbonized CoNiFe-MOF-74 (Table S1).…”

Section: Results and Discussionmentioning

confidence: 99%

“…15-0806 for fcc Co, JCPDS no. 04-0850 for fcc Ni). , The characteristics peaks of Fe 3 O 4 are located at 2θ = 18.4, 30.30, 35.53, 43.02, 53.59, and 57.53°, which correspond to the (111), (220), (311), (400), (422), and (511) crystal planes of Fe 3 O 4 (JCPDS no. 65-3107). , To investigate the role of Fe 3 O 4 in cathode function, CoNi-MOF-74 with similar Co and Ni contents, 13.8 and 6.5 wt %, respectively, was also synthesized and annealed under identical conditions as stated earlier to afford the expected characteristic peaks for the fcc CoNi alloy supported on porous carbon (Figure S3b).…”

Section: Results and Discussionmentioning

confidence: 99%

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Selective Reduction of Multivariate Metal–Organic Frameworks for Advanced Electrocatalytic Cathodes in High Areal Capacity and Long-Life Lithium–Sulfur Batteries

Kaid,

Shehab,

Fang

et al. 2024

ACS Appl. Mater. Interfaces

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Lithium−sulfur batteries hold great promise as nextgeneration high-energy-density batteries. However, their performance has been limited by the low cycling stability and sulfur utilization. Herein, we demonstrate that a selective reduction of the multivariate metal−organic framework, MTV-MOF-74 (Co, Ni, Fe), transforms the framework into a porous carbon decorated with bimetallic CoNi alloy and Fe 3 O 4 nanoparticles capable of entrapping soluble lithium polysulfides while synergistically facilitating their rapid conversion into Li 2 S. Electrochemical studies on coin cells containing 89 wt % sulfur loading revealed a reversible capacity of 1439.8 mA h g −1 at 0.05 C and prolonged cycling stability for 1000 cycles at 1 C/1060.2 mA h g −1 with a decay rate of 0.018% per cycle. At a high areal sulfur loading of 6.9 mg cm −2 and lean electrolyte/sulfur ratio (4.5 μL:1.0 mg), the battery based on the 89S@CoNiFe 3 O 4 /PC cathode provides a high areal capacity of 6.7 mA h cm −2 . The battery exhibits an outstanding power density of 849 W kg −1 at 5 C and delivers a specific energy of 216 W h kg −1 at 2 C, corresponding to a specific power of 433 W kg −1 . Density functional theory shows that the observed results are due to the strong interaction between the CoNi alloy and Fe 3 O 4 , facilitated by charge transfer between the polysulfides and the substrate.

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Bidirectional Transformation Enables Hierarchical Nanolaminate Dual‐Phase High‐Entropy Alloys

et al. 2018

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conventional nanostructures, for instance with grain sizes below a critical value of ≈50 nm, can experience softening due to grain boundary sliding. [11,12] Over the past years, a novel approach to microstructure design, known as hierarchical laminate structure, has shown to greatly improve strength and ductility of conventional materials simultaneously, such as Ti alloys and steels, through massive microstructure refinement. [13][14][15][16] Typically, such materials with hierarchical laminate structures consist of a parent phase serving as soft matrix to improve ductility and a hard product phase impeding dislocation motion to strengthen the microstructure. Unfortunately, such heterogeneous materials with high local mechanical disparity among their constituting phases are often prone to internal damage initiation, thus limiting ductility to 3.8-15% for Ti alloys, [13,14] 20-33% for medium Mn steels, [17] and 23-33% for stainless steels. [16] Therefore, the mechanical properties of such hierarchical laminate materials need to be further improved to minimize the probability of internal damage and failure. Also, creating laminate structures in bulk materials often requires imposing complex processing methods, e.g., accumulative roll bonding. [18] Interestingly, a recently developed dual-phase high-entropy alloy (HEA) also exhibits a simultaneous increase of strength and ductility after grain refinement [19][20][21][22][23] as highlighted in Figure 1. The excellent strength-ductility combination of the novel dual-phase HEA has been reported to be related to the transformationinduced plasticity (TRIP) effect, i.e., the displacive phase transformation from the face-centered cubic (FCC γ) matrix into the hexagonal close-packed (HCP ε) phase upon deformation. [19,22] Depending on the magnitude of the stacking fault energy, different compositional variants of recently developed HEAs have shown deformation modes with planar dislocation slip, [24,25] twinning induced plasticity (TWIP), [26] or TRIP effect. [22] Here, we observe another state which is thermodynamically characterized by a similar stability of two co-existing phases (FCC γ and HCP ε). This means that the stacking fault energy of the FCC matrix must assume a near-zero yet positive value so that forward (γ → ε) and backward (ε → γ) transformations can be both triggered in the same material and loading state.We studied the deformation mechanisms in the dual-phase HEA (Fe 50 Mn 30 Co 10 Cr 10 , at%) in more detail via transmission electron microscopy (TEM) analysis and found that this novel TRIP-assisted HEA gradually develops a hierarchical Microstructural length-scale refinement is among the most efficient approaches to strengthen metallic materials. Conventional methods for refining microstructures generally involve grain size reduction via heavy cold working, compromising the material's ductility. Here, a fundamentally new approach that allows load-driven formation and permanent refinement of a hierarchical nanolaminate structure in a novel high-entropy allo...

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Strain-Induced Reverse Phase Transformation in Nanocrystalline Co-Ni Alloys

Cited by 5 publications

References 38 publications

Quo Vadis Dry Reforming of Methane?—A Review on Its Chemical, Environmental, and Industrial Prospects

Quo Vadis Dry Reforming of Methane?—A Review on Its Chemical, Environmental, and Industrial Prospects

Selective Reduction of Multivariate Metal–Organic Frameworks for Advanced Electrocatalytic Cathodes in High Areal Capacity and Long-Life Lithium–Sulfur Batteries

Bidirectional Transformation Enables Hierarchical Nanolaminate Dual‐Phase High‐Entropy Alloys

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