Activation of Aluminum as an Effective Reducing Agent by Pitting Corrosion for Wet-chemical Synthesis

Li, Wei; Cochell, Thomas J.; Manthiram, Arumugam

doi:10.1038/srep01229

Cited by 49 publications

(46 citation statements)

References 31 publications

(55 reference statements)

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“…However, it is well known that H is more active than H 2 , as it can reduce metal oxides such as CuO at room temperature. 49 The poor activity of H 2 as a reducing agent compared with that of H is further confirmed here, following Li et al, 26 /Ti = −1.63 V). However the results obtained here were not so; metallic Sn, Co, and Ni were not produced in their solutions.…”

Section: Morphologies and Compositions Of The Ti-aunps Modifiedsupporting

confidence: 84%

“…The reason behind this is that the standard reduction potentials of SnCl 2 , CoCl 2 and NiCl 2 , after the pH value of their solutions has increased, are now located in the potential range for metal compounds to be reduced by H. On the contrary, decreasing the pH value of the as prepared PbCl 2 solution from 4.6 to 1. These findings on one hand confirm the relevance of H as the actual reducing agent, considering that the passive oxide film covering the metallic substrate is present from the beginning and non-conductive, 26 and on the other hand reveal that the pH value of the test solution is an important controlling parameter in wet chemical synthesis of unsupported and supported MNPs. Based on the above findings we can conclude that MNPs that cannot be synthesized in their as prepared solutions can be produced by just adjusting the pH of these solutions at a value that makes their standard reduction potentials shift to the potential range for metal salts to be reduced by H.…”

Section: Morphologies and Compositions Of The Ti-aunps Modifiedsupporting

confidence: 64%

“…25 As previously mentioned, the literature reveals no citations about Ti activation (without chemical pretreatments) for nanofabrication. However, a very recent study by Li et al 26 showed that Al is activated as a reducing agent by pitting corrosion for wet-chemical synthesis ) unless CC License in place (see abstract). ecsdl.org/site/terms_use address.…”

mentioning

confidence: 97%

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Activation of Titanium for Synthesis of Supported and Unsupported Metallic Nanoparticles

Amin

Fadlallah

Alosaimi

2014

J. Electrochem. Soc.

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Titanium (Ti) resists corrosion due to spontaneous passivation and subsequent formation of a stable, substantially inert oxide film. This passive film limits the reducing ability of Ti in wet chemical synthesis. Aggressive anions are applied here to destabilize Ti passivity, with the objective of activating Ti as a reducing agent for wet-chemical synthesis, through the formation of unsupported and supported metallic nanoparticles (MNPs). For instance, within the first minute of Ti immersion in a standard gold solution (SGS), 1000 ± 3 μg Au/mL in 2% HCl, gold nanoparticles (AuNPs) in solution (unsupported) and a considerable population of highly dispersed AuNPs on Ti (Ti-supported AuNPs) are obtained. This occurs at room temperature, without using reducing agents, stabilizers, or any chemical pre-treatments. Electrochemical measurements revealed that the passivity of Ti was destabilized (oxide thinning/dissolution) in the SGS. The addition of F − to the SGS promoted destabilization of the passive film, and hence activated the reducing ability of Ti. This in turn resulted in significant increase in the population of AuNPs on Ti. Reduction of cations in solution by the active nascent (atomic) hydrogen (H) generated by substrate (Ti) dissolution, promoted by the addition of F − , in acidic medium is confirmed here and discussed vs. conductivity of the oxide (passive) film and solution pH. Experimental findings reveal that the relevance of H as the actual reducing agent is limited to instantaneous and non-conductive passive films. Solution pH studies on such passive films show that the Nernst equation (dE H/H + /d(pH) = −0.059 V) controls the wet chemical synthesis of MNPs rather than E o reduction of the base metal (the substrate). Based on polarization measurements, the prepared Ti-supported AuNPs are demonstrated here as highly active electrocatalysts (better than Pt) for the hydrogen evolution reaction (HER) in 0.1 M HCl solution.Nanoparticles constitute a key area of research and development in the burgeoning field of nanotechnology. The attraction of nanoparticles lies in the myriad of attractive characteristics which can be achieved by reducing suitable materials from the bulk to the nanometer size, these characteristics ranging from increased surface/volume ratio to novel quantum confinement effects. 1 Examples of property enhancements include magnetic, optical, biosensing, thermoelectric, semiconducting, catalytic, energy storage and thermal properties. 2-7 An interesting aspect of nanoparticles is the wide range of material classes in which nanoparticles are useful, including semiconductor, dielectric, metallic, ceramic, composite and polymer nanoparticles. For these reasons, metal nanoparticles have attracted a high interest in scientific research and industrial applications. [8][9][10] Metal nanoparticles (MNPs) can be produced by reducing metal salts with reducing agents and stabilizing them with capping ligands, 11 and they can be subsequently attached to another metal. However, it is more desirable to d...

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Section: Morphologies and Compositions Of The Ti-aunps Modifiedsupporting

confidence: 84%

Section: Morphologies and Compositions Of The Ti-aunps Modifiedsupporting

confidence: 64%

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Activation of Titanium for Synthesis of Supported and Unsupported Metallic Nanoparticles

Amin

Fadlallah

Alosaimi

2014

J. Electrochem. Soc.

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“…It is known that atomic hydrogen within metals can serve as a strong reducing agent [24], recently it was found to reduce several metals including as Cu, Sb, Sn, Bi etc., from their salt solutions. The reduction potential for H/H + from those studies was found to be in the range −0.17 to −0.24 V SHE , in the pH range 3 to 4.…”

Section: Introductionmentioning

confidence: 99%

The effect of absorbed hydrogen on the dissolution of steel

Thomas

Ott

Schaller

et al. 2016

Heliyon

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Atomic hydrogen (H) was introduced into steel (AISI 1018 mild steel) by controlled cathodic pre-charging. The resultant steel sample, comprising about 1 ppmw diffusible H, and a reference uncharged sample, were studied using atomic emission spectroelectrochemistry (AESEC). AESEC involved potentiodynamic polarisation in a flowing non-passivating electrolyte (0.6 M NaCl, pH 1.95) with real time reconciliation of metal dissolution using on-line inductively coupled plasma-atomic emission spectroscopy (ICP-OES). The presence of absorbed H was shown to significantly increase anodic Fe dissolution, as evidenced by the enhanced detection of Fe2+ ions by ICP-OES. We discuss this important finding in the context of previously proposed mechanisms for H-effects on the corrosion of steels.

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“…Worldwide, only a few reports are available, that finds a remedial solution on biofilm/fouling/corrosion complications in which, some of the researchers focused only on bioactive compounds from seaweeds. The need for new solutions to prevent antibacterial, antifouling and anticorrosion has considerably increased, since the prohibition of organotin additions to antifouling coatings 25–27 .…”

Section: Discussionmentioning

confidence: 99%

Biogenic corrosion inhibitor on mild steel protection in concentrated HCl medium

Muthukumar

Harinee

Dahms‬

et al. 2018

Sci Rep

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Turbinaria ornata (TO) extract was tested as green corrosion inhibitor on mild steel (MS) coupons in conc. HCl medium with an efficiency of 100% at 25 g l −1 during 5 min exposure. Antibacterial efficacy performed against 16 S rDNA identified marine biofilming bacteria (MBB) and human pathogenic bacteria (HPB). Maximum inhibition growth was 16 mm on MBB observed in Bacillus megaterium (MBF14 -AB894827) and 20 mm on HPB in Escherichia coli (B5 -NCIM 2931). Similarly, minimum of 10 mm on MBB witnessed in Pseudomonas sp., (MBF9 -AB894829). Toxicity studies proved 50.0% LC 50 at 500 μg ml −1 in 24 hrs, whereas Balanus amphitrite resulted in 100% mortality within 12 hrs. Results including weight loss, potentiodynamic polarization and electrochemical impedance spectroscopy, FT-IR and GC-MS confirm 10-Octadecaonic acid as a major corrosion inhibitor from T. ornata and is discovered as a novel antifoulant. Anticorrosion formulation will become available soon.

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Activation of Aluminum as an Effective Reducing Agent by Pitting Corrosion for Wet-chemical Synthesis

Cited by 49 publications

References 31 publications

Activation of Titanium for Synthesis of Supported and Unsupported Metallic Nanoparticles

Activation of Titanium for Synthesis of Supported and Unsupported Metallic Nanoparticles

The effect of absorbed hydrogen on the dissolution of steel

Biogenic corrosion inhibitor on mild steel protection in concentrated HCl medium

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