Graphene and graphene oxide as new class of materials for corrosion control and protection: Present status and future scenario

Chauhan, Dheeraj Singh; Quraishi, M.A.; Ansari, K.R.; Saleh, Tawfik A.

doi:10.1016/j.porgcoat.2020.105741

Cited by 123 publications

(73 citation statements)

References 213 publications

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“…The carbon shell not only protects CoMoP from corrosion but also optimizes the absorption behavior of intermediates during the electrolysis. Chauhan et al 75 made a summary on plenty of graphene coatings, for instance, single-/multi-layered graphene coatings were employed to protect the vulnerable matrix. This versatile strategy can be easy to scale up in the industrial process since we already have mature graphene synthesis technology.…”

Section: Active Catalysts Coated With An Extrinsicallymentioning

confidence: 99%

Challenges and Opportunities for Seawater Electrolysis: A Mini-Review on Advanced Materials in Chlorine-Involved Electrochemistry

Cui¹,

Shi²,

Li³

et al. 2021

Acta Physico Chimica Sinica

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Hydrogen (H2) is an important component in the framework of carbonneutral energy, and the scalable production of H2 from seawater electrolysis offers a feasible route to address global energy challenges. With abundant seawater reserves, seawater electrolysis, especially when powered by renewable electricity sources, has great prospects. However, chloride ions (Cl − ) in seawater can participate in the anodic reaction and accelerate the corrosion of electrode materials during electrolysis. Although the oxygen evolution reaction (OER) is thermodynamically favorable, the chlorine evolution reaction is highly competitive because fewer electrons are involved (2e − ). These two problems are compounded by the dearth of corrosion-resistant electrode materials, which hinders the practical applications of seawater electrolysis. Therefore, intensive research efforts have been devoted to optimizing electrode materials using fundamental theories for practical applications. This review summarizes the recent progress in advanced electrode materials with an emphasis on their selectivity and anti-corrosivity. Practical materials with improved selectivity for oxygen generation, such as mixed metal oxides, Ni/Fe/Co-based composites, and manganese oxide (MnOx)-coated heterostructures, are reviewed in detail. Theoretically, alkaline environments (pH > 7.5) are preferred for OER as a constant potential gap (480 mV) exists in the high pH region. Nevertheless, corrosion of both the cathode and anode from ubiquitous Clis inevitable. Only a few materials with good corrosion resistance are capable of sustained operation in seawater systems; these include metal titanium and carbon-based materials. The corrosion process is usually accompanied by the formation of a passivated layer on the surface, but the aggressive penetration of Clcan damage the whole electrode. Therefore, the selective inhibition of Cl − transport in the presence of a robust layer is critical to prevent continuous corrosion. Advances in anti-corrosion engineering, which encompasses inherently anti-corrosive materials, extrinsically protective coating, and in situ generated resistive species, are systematically discussed. Rational design can impart the material with good catalytic activity, stability, and corrosion resistance. Finally, we propose the following opportunities for future research: 1) screening of selective and anti-corrosive materials; 2) mechanism of competitive reactions and corrosion; 3) evaluation of anti-corrosive materials; 4) industrial-scale electrolysis with high current density; 5) optimization of experimental conditions; and 6) development of integrated electrolyzer devices. This review provides insights for the development of strategies aimed at tackling chlorine-related issues in seawater electrolysis.

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Section: Active Catalysts Coated With An Extrinsicallymentioning

confidence: 99%

Challenges and Opportunities for Seawater Electrolysis: A Mini-Review on Advanced Materials in Chlorine-Involved Electrochemistry

Cui¹,

Shi²,

Li³

et al. 2021

Acta Physico Chimica Sinica

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“…However, these materials may fail due to electrolyte exposure which is responsible for cathodic delamination and physical damage like impact, scratching, or wear during service. This allows direct contact of underlying steel substrates to aggressive environment and electrochemical reaction taking place at the coating-substrate interface [117]. The increase in hydroxide ions concentration results in alkalization weakening the adhesion of steel substrate and coating.…”

Section: Chemical Properties Of Nanofiller-tpu Nanocompositesmentioning

confidence: 99%

Investigating Physio-Thermo-Mechanical Properties of Polyurethane and Thermoplastics Nanocomposite in Various Applications

et al. 2021

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The effect of the soft and hard polyurethane (PU) segments caused by the hydrogen link in phase-separation kinetics was studied to investigate the morphological annealing of PU and thermoplastic polyurethane (TPU). The significance of the segmented PUs is to achieve enough stability for further applications in biomedical and environmental fields. In addition, other research focuses on widening the plastic features and adjusting the PU–polyimide ratio to create elastomer of the poly(urethane-imide). Regarding TPU- and PU-nanocomposite, numerous studies investigated the incorporation of inorganic nanofillers such as carbon or clay to incorporating TPU-nanocomposite in several applications. Additionally, the complete exfoliation was observed up to 5% and 3% of TPU–clay modified with 12 amino lauric acid and benzidine, respectively. PU-nanocomposite of 5 wt.% Cloisite®30B showed an increase in modulus and tensile strength by 110% and 160%, respectively. However, the nanocomposite PU-0.5 wt.% Carbone Nanotubes (CNTs) show an increase in the tensile modulus by 30% to 90% for blown and flat films, respectively. Coating PU influences stress-strain behavior because of the interaction between the soft segment and physical crosslinkers. The thermophysical properties of the TPU matrix have shown two glass transition temperatures (Tg’s) corresponding to the soft and the hard segment. Adding a small amount of tethered clay shifts Tg for both segments by 44 °C and 13 °C, respectively, while adding clay from 1 to 5 wt.% results in increasing the thermal stability of TPU composite from 12 to 34 °C, respectively. The differential scanning calorimetry (DSC) was used to investigate the phase structure of PU dispersion, showing an increase in thermal stability, solubility, and flexibility. Regarding the electrical properties, the maximum piezoresistivity (10 S/m) of 7.4 wt.% MWCNT was enhanced by 92.92%. The chemical structure of the PU–CNT composite has shown a degree of agglomeration under disruption of the sp2 carbon structure. However, with extended graphene loading to 5.7 wt.%, piezoresistivity could hit 10-1 S/m, less than 100 times that of PU. In addition to electrical properties, the acoustic behavior of MWCNT (0.35 wt.%)/SiO2 (0.2 wt.%)/PU has shown sound absorption of 80 dB compared to the PU foam sample. Other nanofillers, such as SiO2, TiO2, ZnO, Al2O3, were studied showing an improvement in the thermal stability of the polymer and enhancing scratch and abrasion resistance.

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“…Portanto, é discutível se o material resultante pode ser classificado como grafeno, sendo, de modo geral, denominado de óxido de grafeno reduzido (rGO). Neste sentido, apesar da carência de definições mais bem estabelecidas, o rGO pode ser entendido como um material resultante de um processo de redução do GO, que apresenta propriedades semelhantes ao grafeno como caráter aromático e condutividade elétrica, no entanto, defeitos intrínsecos e extrínsecos remanescentes ainda se fazem presentes [104,105]. O elevado rendimento e o baixo custo tornam a obtenção do grafeno pela esfoliação da grafite, via formação e redução do GO, um método bastante vantajoso.…”

Section: óXido De Grafeno: Propriedades E Reduçãounclassified

Híbridos de grafeno/montmorillonita e óxido de grafeno/montmorillonita como nanomateriais funcionais: uma visão da literatura atual

et al. 2021

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Resumo Os híbridos derivados de grafeno ou óxido de grafeno e o argilomineral montmorillonita são materiais cuja matriz do filossilicato oferece estabilização das camadas nanométricas das estruturas carbonáceas, além de melhoramento das propriedade físico-químicas e da biocompatibilidade. Por sua vez, o grafeno e seus derivados agregam novas funcionalidades à montmorillonita e ao aumento da reatividade. Os materiais funcionais resultantes do sinergismo entre os constituintes têm sido explorados em diferentes aplicações, como em processos de remediação ambiental por meio de adsorção e catálise, ciência de materiais, áreas biológicas e biomédicas. No âmbito dessa revisão, as principais rotas para obtenção dos híbridos de grafeno e derivados com montmorillonita são apresentadas, relacionando os fatores estruturais e interações entre os constituintes para formação dos compósitos. Ainda os principais métodos de caracterização são discutidos e as aplicações mais recentes são relacionadas às características estruturais, morfológicas, térmicas e texturais.

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Graphene and graphene oxide as new class of materials for corrosion control and protection: Present status and future scenario

Cited by 123 publications

References 213 publications

Challenges and Opportunities for Seawater Electrolysis: A Mini-Review on Advanced Materials in Chlorine-Involved Electrochemistry

Challenges and Opportunities for Seawater Electrolysis: A Mini-Review on Advanced Materials in Chlorine-Involved Electrochemistry

Investigating Physio-Thermo-Mechanical Properties of Polyurethane and Thermoplastics Nanocomposite in Various Applications

Híbridos de grafeno/montmorillonita e óxido de grafeno/montmorillonita como nanomateriais funcionais: uma visão da literatura atual

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