The Corrosion of Mo‐Al Alloys in a  H 2 /  H 2 S  /  H 2 O  Gas Mixture at 800–1000°C

Kai, Wu; Bai, Ching Yuan

doi:10.1149/1.1838631

Cited by 4 publications

(6 citation statements)

References 6 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The critical potential E c , where sustained bulk dissolution of copper and the formation of nanoporosity occurs, is around 550 mV vs. Ag/AgCl (∼750 mV vs. SHE). This value is slightly higher compared to earlier reports 22,24,25 (for the dissolution of Cu from Cu 80 Pd 20 ) by potentiostatic or quasi-static measurements which is well in line with the differences of the potentiostatic and dynamic methods and the slight difference in composition. 39,40 In-situ X-ray scattering.-In order to obtain information on the evolution of the (averaged) surface structure and morphology during initial dealloying of Cu 3 Pd (111) and Cu 3 Pd (100), we performed in-situ X-ray diffraction in electrolyte as a function of applied overpotential.…”

Section: Resultssupporting

confidence: 83%

“…Kinetic effects thus usually result in a higher value of E c with potentiodynamic scans compared to its determination by a series of potentiostatic measurements. 22,39 Figure 3 shows an anodic scan of the potentiodynamic polarization behavior of the Cu 3 Pd polycrystalline UHV-prepared surface obtained at a scan rate of 10 mV/s in 0.1 M H 2 SO 4 solution. The decrease in current density after an initial peak due to copper dissolution during the anodic scan shows the passive-like behavior below E c which is associated with Pd accumulation on the surface.…”

Section: Resultsmentioning

confidence: 99%

“…Hence, Pd-based alloys are interesting model systems to study and compare with the other systems. They have however received much less attention [20][21][22][23][24][25][26][27] even though palladium is a technically important element. Palladium is for example used for gas sensing applications, hydrogen storage, or for catalysis.…”

mentioning

confidence: 99%

See 2 more Smart Citations

Dealloying of Cu₃Pd Single Crystal Surfaces

Ankah

Meimandi

Renner

2013

J. Electrochem. Soc.

View full text Add to dashboard Cite

Nanoporous metallic structures formed from dealloying have recently attracted considerable interest due to a wide range of potential applications in areas such as catalysis, actuators, biomedical sensors and fuel cell electrodes. The Cu-Pd system is interesting as a model system for corrosion as well as a potential catalyst material. We report a combined in-situ X-ray diffraction (XRD) and ex-situ atomic force microscopy (AFM) study of the initial structural evolution during the selective dissolution of Cu from Cu3Pd (111) and Cu3Pd (100). The experiments were performed under potential control in 0.1 M H2SO4 solution. Below the critical potential, no distinct diffraction signal is evidenced by in-situ XRD but AFM reveals the existence of islands on the surfaces. At the critical potential, on both single crystal surfaces the formation of an epitaxial Pd layer exhibiting substrate orientation is evidenced by XRD. Ex-situ AFM imaging clearly showed at comparable stages the formation of larger nanoscale islands. We further compare and contrast the behavior of the dealloyed Cu-Pd surfaces with that of Cu-Au alloys.

show abstract

Section: Resultssupporting

confidence: 83%

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

Dealloying of Cu₃Pd Single Crystal Surfaces

Ankah

Meimandi

Renner

2013

J. Electrochem. Soc.

View full text Add to dashboard Cite

show abstract

“…That is, grain-boundary engineering will be useful in designing the active materials to control the stress level. Considering that diffusion-induced stresses have a great impact on the capacity fading of electrode materials, C. Kai et al [343] developed a diffusion-controlled FEM model to understand the stress evolution at the GBs in the LiFePO 4 upon discharging. The mechanical stresses (normal stress and shear stress) were found to have the highest values on the free surface of GBs.…”

Section: Finite Element Simulationmentioning

confidence: 99%

Interfacial Incompatibility and Internal Stresses in All‐Solid‐State Lithium Ion Batteries

Liu

et al. 2019

Advanced Energy Materials

View full text Add to dashboard Cite

The continuous depletion of fossil fuels, the increase of oil prices, and the need to decrease CO 2 emissions have stimulated intensive research on developing alternative renewable and clean energy sources. [1] Among these alternative energy sources, rechargeable Li-ion batteries (LIBs) are one of the promising candidates. To date, the LIBs basically consisting of a positive electrode (cathode), an electrolyte, and a negative electrode (anode) have widespread applications, such as portable electronic devices, pure electric vehicles (PEVs), and hybrid electric vehicles (HEVs). [2] The state-of-the-art electrolytes are usually the lithium salts (LiPF 6 , LiBF 4 , and LiCF 3 SO 3 ) dissolved in organic solvents, i.e., ethylene carbonate, propylene carbonate, polyethylene oxide, and dimethyl carbonate, [3] which exhibit excellent wetting of the electrodes and produce a fast transfer of Li + ions upon charging and discharging. However, they suffer from flammability, poor electrochemical stability, limited temperature range of operation, and low power density. [4] There is an ever-increasing demand for batteries with a higher energy and power density, although current LIBs offer volumetric and gravimetric energy densities up to 770 Wh L −1 and 260 Wh kg −1 , respectively. [5] To improve the energy/power density of LIBs, one way is to adopt high-potential cathode materials such as LiNi 0.5 Mn 1.5 O 4 (LNMO). The high-voltage plateau of LNMO (≈4.7 V vs Li/Li + ) makes its energy density 20-30% higher than the energy density of commercial LiCoO 2 and LiFePO 4 . [6] However, successful commercialization of the LNMO is restricted in high-energy LIBs due to electrolyte decomposition and side reaction of the cathodes and liquid electrolytes when operating at high voltages. [7,8] The other way to improve the energy/power density is to replace the conventional graphite anode with Li metal. The Li metal, with a low anode potential (−3.04 V vs standard hydrogen electrode) and high specific capacity (3862 mAh g −1 for the Li anode versus 372 mAh g −1 for the graphite anode), [9][10][11] has been considered as the "Holy Grail" of battery technologies. When paired with sulfur and oxygen, the theoretical energy density of Li-S (≈2567 Wh kg −1 ) and Li-O 2 (≈3505 Wh kg −1 ) batteries is far higher than the theoretical energy density of conventional LIBs (≈387 Wh kg −1 ). [12][13][14][15] When Li metal approaches the liquid electrolytes, however, unstable Li/electrolyte interface Rechargeable Li-ion batteries (LIBs) are electrochemical storage device widely applied in electric vehicles, mobile electronic devices, etc. However, traditional LIBs containing liquid electrolytes suffer from flammability, poor electrochemical stability, and limited operational temperature range. Replacement of the liquid electrolytes with inorganic solid-state electrolytes (SSEs) would solve this problem. However, several critical issues, such as poor interfacial compatibility, low ionic conductivity at ambient temperatures, etc., need to be surmounted befor...

show abstract

“…14,15) Furthermore, Al-Mo alloys or alloying common metals with Al and Mo recently have been confirmed to possess excellent resistance to individual or simultaneous oxidation and sulfidation because of the formation of protective corrosion products such as Al 2 O 3 , MoS 2 , and Al 0:55 Mo 2 S 4 . [16][17][18] Electrical discharge surface alloying of Ni-based superalloy Haynes 230 with aluminum and molybdenum is thus expected to improve its resistance of wear and high temperature oxidation and corrosion. The EDA process included the use of Al-Mo composite electrode and the suspension of AlMo mixture powders in dielectric fluid.…”

Section: Introductionmentioning

confidence: 99%

Electrical Discharge Surface Alloying of Superalloy Haynes 230 with Aluminum and Molybdenum

2004

View full text Add to dashboard Cite

Surface alloying of superalloy Haynes 230 was performed using either Al-Mo mixture powders suspended in kerosene or Al-Mo composite electrode during the electrical discharge alloying (EDA). For suspending Al-Mo powders in kerosene, the Cr 23 C 6 , WC 1Àx , and graphite phases exist in the alloyed layer of the EDA specimen with negative electrode polarity, while the specimen with positive electrode polarity exhibits no alloying phase except the raw material phase. For employing the Al-Mo electrode with negative polarity, the specimen represents many discontinuous piled-layers, with Al 3 Mo 8 and AlMo 3 phases accumulating on the substrate surface. The specimen produced using Al-Mo electrode with positive polarity shows an alloyed layer constituted mainly with NiAl phase. This specimen also shows the smallest surface roughness and highest hardness among the four EDA specimens. The kinetics of isothermal oxidation at 1000C in static air demonstrate that the specimen using Al-Mo electrode with positive polarity possesses the best oxidation resistance among the tested specimens.

show abstract

The Corrosion of Mo‐Al Alloys in a H 2 / H 2 S / H 2 O Gas Mixture at 800–1000°C

Cited by 4 publications

References 6 publications

Dealloying of Cu₃Pd Single Crystal Surfaces

Dealloying of Cu₃Pd Single Crystal Surfaces

Interfacial Incompatibility and Internal Stresses in All‐Solid‐State Lithium Ion Batteries

Electrical Discharge Surface Alloying of Superalloy Haynes 230 with Aluminum and Molybdenum

Contact Info

Product

Resources

About

The Corrosion of Mo‐Al Alloys in a H 2 / H 2 S / H 2 O Gas Mixture at 800–1000°C

Cited by 4 publications

References 6 publications

Dealloying of Cu3Pd Single Crystal Surfaces

Dealloying of Cu3Pd Single Crystal Surfaces

Interfacial Incompatibility and Internal Stresses in All‐Solid‐State Lithium Ion Batteries

Electrical Discharge Surface Alloying of Superalloy Haynes 230 with Aluminum and Molybdenum

Contact Info

Product

Resources

About

Dealloying of Cu₃Pd Single Crystal Surfaces

Dealloying of Cu₃Pd Single Crystal Surfaces