Crystallization of Fe3+ in an alkaline aqueous pseudocapacitor system

Chen, Xu; Chen, Kunfeng; Wang, Hao; Song, Shuyan; Xue, Dongfeng

doi:10.1039/c4ce00660g

Cited by 30 publications

(24 citation statements)

References 24 publications

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“…The scan rate is 50 mV/s in 1 M KCl supporting electrolyte solution.an irreversible redox process with a reduction current peak in the potential between −0.4 and −0.2 V, which is in agreement with literature results for the electrochemical analysis of the FeCl 3 solutions 35. This finding further supports the presence of Fe(III) in the KL-Fe-LNCs and confirms the different architecture of the capsules formed in the presence of Fe(III) salts.…”

supporting

confidence: 75%

Coordination Complexes and One-Step Assembly of Lignin for Versatile Nanocapsule Engineering

Bartzoka

Lange

Thiel

et al. 2016

ACS Sustainable Chem. Eng.

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Nanoencapsulation of active substances with controlled release in harmless matrices has been the subject of numerous scientific efforts mainly due to the significant biomedical potential of such endeavors. Lignin, the environmentally sustainable byproduct of the pulp and paper industry, contains a multitude of phenolic hydroxyl groups, some of which, are known to readily and strongly chelate with iron ions. In this effort we demonstrated that the concerted use of chelation chemistry, oil in water emulsion principles, and low energy sonication, offers a facile, one-pot strategy to assemble lignin nanocapsules (LNCs) of a controlled architecture. Under these conditions capsules are shown to rapidly assemble utilizing two driving forces, the π-stacking propensity of lignin and its metal chelating ability at alkaline pH. Detailed size exclusion chromatographic evidence validates that the formation of capsules is driven mainly by the enumerated physical interactions with no significant chemical modification of the lignin. The developed process was systematically optimized so as to create the foundations for the morphology and the yield of the capsules being modulated as a function of sonication time, power, and surface contact area. Both pure LNCs and Fe-LNCs were synthesized in high yields with size distributions varying from 0.3 to 6 μm and their release efficiencies were evaluated in detail. As anticipated, the complexation effects of the phenolic OH groups offered to the Fe-LNCs, increased stability, reduced shell thickness (allowing for greater loading efficiencies), and lower release kinetics, compared to LNCs.

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supporting

confidence: 75%

Coordination Complexes and One-Step Assembly of Lignin for Versatile Nanocapsule Engineering

Bartzoka

Lange

Thiel

et al. 2016

ACS Sustainable Chem. Eng.

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“…However, the energy density of the present pseudocapacitor is not high enough to meet the increasing energy demands, usually less than 10 Wh/kg. 8 The energy density of pseudocapacitor is proportional to the specific capacitance and the square of the voltage window as shown in Eq. (2).…”

Section: Resultsmentioning

confidence: 99%

Pseudocapacitors Go to Nanoscale for Performance Enhancement

Xu¹,

Chen²,

Zhang³

et al. 2015

mater focus

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Nanotechnology can highly promote the electrochemical performances of transition metal oxide pseudocapacitors on the basis of thermodynamic data and kinetic reaction processes. The working mechanism of pseudocapacitors is fast and revisable surface Faradaic reactions on the electrodes which differ from bulk redox reactions in lithium ion batteries. The nanostructured electroactive materials with high specific surface areas, which can be efficiently contact with electrolyte, show enhanced power density. Meanwhile, the nanostructured materials can elevate the utilization ratio of electroactive materials and highly promote the energy density of pseudocapacitors. Besides, nanostructured materials can short the transport paths for ions of electrolyte and electrons in the electrode system, change electrode potential by modifying the chemical potentials of electrolyte ions and electrons for very small particles, and have more extensive solid solutions for ions intercalation, which benefit the high electrochemical performance.

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“…2) [31,32]. The principle of colloidal ionic supercapacitor systems has been proven in multiple-valence metal cations of Cu 2+ [33], Fe 3+ [34,35], Co 2+ [28], Ni 2+ [36], Sn 4+ [37], Yb 3+ [38] and Er 3+ [39] ionic systems. In addition, binary A x B 1Àx ionic pseudocapacitor systems involving Mn, Fe, Co, and Ni have also been developed [40].…”

Section: Advantages Of Colloidal Supercapacitor Electrode Materialsmentioning

confidence: 99%