Solution pH regulating mass transport in highly ordered nanopore array electrode

Li, Chengyong; Tian, Yuwei; Shao, Wenting; Yuan, Chun-Ge; Wang, Kang; Xia, Xing‐Hua

doi:10.1016/j.elecom.2014.01.020

Cited by 20 publications

(10 citation statements)

References 32 publications

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“…Since a significant proportion of the sealing process take place in the nanopores of the anodic aluminum oxide layer of typical diameters in the range of 7-20 nm, the sealing process can be viewed as a process taking place in nanoconfined spaces (i.e., in a nanoporous electrode) [273][274][275][276], which are most likely to display peculiarities quite different from similar processes in/on micro-and macro-electrodes [277][278][279][280]. Taking the nano-dimensions of the pores of anodic aluminum oxide into consideration, Rocca et al [78,87] had studied the possible effects of such dimensions on both mass transport into the pores and chemical reactivity of the pore walls and reported interesting results.…”

Section: Effect Of the Nano-dimension Of The Pores And The Surface Chmentioning

confidence: 99%

The Sealing Step in Aluminum Anodizing: A Focus on Sustainable Strategies for Enhancing Both Energy Efficiency and Corrosion Resistance

2020

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Increasing demands for environmental accountability and energy efficiency in industrial practice necessitates significant modification(s) of existing technologies and development of new ones to meet the stringent sustainability demands of the future. Generally, development of required new technologies and appropriate modifications of existing ones need to be premised on in-depth appreciation of existing technologies, their limitations, and desired ideal products or processes. In the light of these, published literature mostly in the past 30 years on the sealing process; the second highest energy consuming step in aluminum anodization and a step with significant environmental impacts has been critical reviewed in this systematic review. Emphasis have been placed on the need to reduce both the energy input in the anodization process and environmental implications. The implications of the nano-porous structure of the anodic oxide on mass transport and chemical reactivity of relevant species during the sealing process is highlighted with a focus on exploiting these peculiarities, in improving the quality of sealed products. In addition, perspective is provided on plausible approaches and important factors to be considered in developing sealing procedures that can minimize the energy input and environmental impact of the sealing step, and ensure a more sustainable aluminum anodization process/industry.Coatings 2020, 10, 226 2 of 55 sealing methods. Furthermore, the applicability of another hitherto popular sealing process; chromate sealing, is currently limited to essential parts in the aerospace industry due to toxicological, health, and environmental implications traced to Cr(VI) employed in the process [7][8][9][10][11][12][13][14][15][16]. On the other hand, the advantages of another industrially utilized sealing process; the nickel fluoride (cold) sealing process is limited by the toxicity of nickel salts which narrows its range of application, and introduces added costs due to post-sealing wastewater treatments and management [17][18][19][20]. Further efforts at sealing anodized aluminum at temperatures lower than that used in hydrothermal (high temperature) sealing, have led to much variety in the chemical constitution and operating temperatures of sealing baths [21]. On the basis of temperature at which the sealing step is carried out, sealing can be classified into three major categories; high temperature, mid-temperature, and room-temperature or cold sealing. In this work sealing at temperatures from 0 to 40 • C is classified as low temperature sealing, from ≥ 40 • C to 70 • C as intermediate or mid temperature sealing, and sealing at temperatures > 70 • C as high temperature sealing.

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Section: Effect Of the Nano-dimension Of The Pores And The Surface Chmentioning

confidence: 99%

The Sealing Step in Aluminum Anodizing: A Focus on Sustainable Strategies for Enhancing Both Energy Efficiency and Corrosion Resistance

2020

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“…It was, however, demonstrated that the Levich diffusion limited current was never CHEMELECTROCHEM REVIEWS www.chemelectrochem.org reached. Hierarchical porosity can also be reached by depositing conductive NP in a porous template, [249] or by introducing nanometer polystyrene beads inside a carbon network. Barton et al reported an elegant work based on this idea.…”

Section: A Challenging Issue: Overcoming Mass-transport Limitationmentioning

confidence: 99%

Biohydrogen for a New Generation of H₂/O₂ Biofuel Cells: A Sustainable Energy Perspective

et al. 2014

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Among sustainable alternatives to fossil fuel, proton exchange membrane fuel cells are promising devices that deliver electricity from hydrogen and oxygen, producing only water. The transformation of the fuel and oxidant however relies on rare‐metal catalysts. H2/O2 enzymatic biofuel cells thus emerge as sustainable biotechnological devices in which chemical catalysts are replaced by hydrogenases at the anode and multicopper oxidases at the cathode. This review discusses the recent breakthroughs and the limitations in all the components of H2/O2 biofuel cells: 1) Catalytic mechanisms involved in multicopper oxidases and hydrogenases, in addition to the new potential of enzymes from the biodiversity pool, which exhibit outstanding properties. 2) The molecular basis for oriented enzyme immobilization on the electrochemical interfaces as a prerequisite for a fast direct electron‐transfer rate. 3) The requirement for 3D networks to enhance current densities. 4) The production of H2 from biomass. 5) The history of H2/O2 biofuel cells and recent devices, which also highlights the remaining issues that will allow the use of such devices in low‐power applications.

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“…In addition, label-free DNA analysis has been widely used in biochemical analysis [176][177][178][179]. Researchers have proposed various amplification strategies to improve the high-sensitivity analysis of DNA in nanochannels [180][181][182].…”

Section: Ion-responsive Nanochannelsmentioning

confidence: 99%

Bioinspired nanochannels based on polymeric membranes

Wang

et al. 2021

Sci. China Mater.

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Bio-nanochannels in living organisms participate in the physiological activities by selectively transporting ions through cell membranes. The structure and function of biological ion channels inspire the development of artificial ion nanochannels with practical applications. The bioinspired nanochannels based on polymer materials present good mechanical stability, high-performance ion transport and designability, which have attracted much attention. In this review, we mainly focus on the fabrication and application of polymer-based biomimetic nanochannels especially in environmentally responsive biosensor and energy conversion. We firstly introduce the basic understanding of nanochannels in ion regulation and osmotic energy conversion. Then, we discuss the fabrication methods of polymer-based nanochannels and highlight their advantages compared with other materials. The practical applications of polymer-based biomimetic nanochannels, especially in energy conversion and environmentally responsive biosensor, are detailedly discussed. Finally, we summarize the unsolved problems in bioinspired nanochannels and overview the further developing direction in this field.

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Solution pH regulating mass transport in highly ordered nanopore array electrode

Cited by 20 publications

References 32 publications

The Sealing Step in Aluminum Anodizing: A Focus on Sustainable Strategies for Enhancing Both Energy Efficiency and Corrosion Resistance

The Sealing Step in Aluminum Anodizing: A Focus on Sustainable Strategies for Enhancing Both Energy Efficiency and Corrosion Resistance

Biohydrogen for a New Generation of H₂/O₂ Biofuel Cells: A Sustainable Energy Perspective

Bioinspired nanochannels based on polymeric membranes

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Solution pH regulating mass transport in highly ordered nanopore array electrode

Cited by 20 publications

References 32 publications

The Sealing Step in Aluminum Anodizing: A Focus on Sustainable Strategies for Enhancing Both Energy Efficiency and Corrosion Resistance

The Sealing Step in Aluminum Anodizing: A Focus on Sustainable Strategies for Enhancing Both Energy Efficiency and Corrosion Resistance

Biohydrogen for a New Generation of H2/O2 Biofuel Cells: A Sustainable Energy Perspective

Bioinspired nanochannels based on polymeric membranes

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Product

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Biohydrogen for a New Generation of H₂/O₂ Biofuel Cells: A Sustainable Energy Perspective