Role of acetyl group on proton conductivity in chitin system

Kawabata, Takashi; Matsuo, Yuichi

doi:10.1016/j.jmat.2019.02.010

Cited by 12 publications

(11 citation statements)

References 5 publications

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“…It is also known that biological materials are beneficial for proton conduction, hydrogen production, etc. For example, biomaterials such as DNA, collagen, chitin, and chitosan show relatively high proton conductivity under humidified conditions and become the electrolyte of the fuel cell [ 24 , 25 , 26 , 27 , 28 , 29 , 30 , 31 , 32 , 33 , 34 ]. Recently, it was reported that a DNA-electrolyte fuel cell was fabricated and that the proton conductivity of DNA electrolyte is caused by forming the water bridges in DNA [ 24 , 25 , 26 ].…”

Section: Introductionmentioning

confidence: 99%

“…Furthermore, Freier et al showed the results of proton transfer via a transient linear water-molecule chain in a membrane protein [ 31 ], and Ordinario et al showed the bulk protonic conductivity in a cephalopod structural protein [ 32 ]. In addition, Kawabata et al fabricated the chitin-based fuel cell, and its proton conductivity was reported [ 33 , 34 ]. Thus, recently, there are a lot of research works on the proton conductor of biomaterials.…”

Section: Introductionmentioning

confidence: 99%

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Novel Biofuel Cell Using Hydrogen Generation of Photosynthesis

Iwahashi

Yamada

Matsuo

et al. 2020

JFB

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Energies based on biomaterials attract a lot of interest as next-generation energy because biomaterials are environmentally friendly materials and abundant in nature. Fuel cells are also known as the clean and important next-generation source of energy. In the present study, to develop the fuel cell based on biomaterials, a novel biofuel cell, which consists of collagen electrolyte and the hydrogen fuel generated from photochemical system II (PSII) in photosynthesis, has been fabricated, and its property has been investigated. It was found that the PSII solution, in which PSII was extracted from the thylakoid membrane using a surfactant, generates hydrogen by the irradiation of light. The typical hydrogen-generating rate is approximately 7.41 × 1014 molecules/s for the light intensity of 0.5 mW/cm2 for the PSII solution of 5 mL. The biofuel cell using the PSII solution as the fuel exhibited approximately 0.12 mW/cm2. This result indicates that the fuel cell using the collagen electrolyte and the hydrogen fuel generated from PSII solution becomes the new type of biofuel cell and will lead to the development of the next-generation energy.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Novel Biofuel Cell Using Hydrogen Generation of Photosynthesis

Iwahashi

Yamada

Matsuo

et al. 2020

JFB

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“…In this way, the power density of the fuel cell using chitin electrolyte is considerably larger than that using chitosan electrolyte. These results indicate that proton conductivity of chitin is different from [13].…”

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confidence: 80%

“…Chitin and chitosan are available at low cost and are environmentally friendly. Figure 1 Figure 1(a), the fuel cell-based on chitin electrolyte operates at maximum power density 1.35 mW/cm 2 , while the fuel cell using the chitosan electrolyte shows the maximum power density of 0.032 mW/cm 2 [12] [13]. The prepared fuel cell used platinum electrodes and a 70 µm thick chitin or chitosan sheet as the electrolyte.…”

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confidence: 99%

Anomalous Proton Conductivity in Chitin-Chitosan Mixed Compounds

Kawabata¹,

Takahashi²,

Matsuo³

2020

MSA

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In order to investigate a key factor for the appearance of proton conductivity in chitin-chitosan mixed compounds, the chitin-chitosan mixed compounds (chitin) x (chitosan) 1−x were prepared and these proton conductivities have been investigated. DC proton conductivity 0 σ is obtained from Nyquist plot of impedance measurement data, and the relationship between 0 σ and mixing ratio x has been made clear. It was found that the x dependence of 0 σ is non-monotonous. That is, 0 σ shows the anomalous behavior, and has peaks around x = 0.4 and 0.75. This result indicates that there exist optimal conditions for the realization of high-proton conductivity in the chitin-chitosan mixed compound in which the number of acetyl groups is different. From the FT-IR measurement, we have found that the behavior of proton conductivity in (chitin) x (chitosan) 1−x is determined by the amount of water content changed by x. Using these results, proton conductivity, which is important for the application of conducting polymers in chitin-chitosan mixed compounds, will be able to be easily controlled by adjusting the mixing ratio x.

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“…Biomaterials have the ability to transport and produce hydrogen ions and are expected to be used as fuels and electrolytes for fuel cells. For example, materials such as DNA, collagen, chitin, and chitosan exhibit relatively high-proton conductivity by hydration and can be used as the fuel-cell electrolyte [10][11][12][13][14][15][16][17][18]. Furthermore, many studies were conducted on hydrogen production using biomaterials, such as enzyme reactions, microbial electrolysis-cell reactions, fermentative reactions, and reactions using the anaerobic environment of the algae [19][20][21][22][23][24][25][26][27].…”

Section: Introductionmentioning

confidence: 99%

Solid-State Hydrogen Fuel by PSII–Chitin Composite and Application to Biofuel Cell

et al. 2021

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Biomaterials attract a lot of attention as next-generation materials. Especially in the energy field, fuel cells based on biomaterials can further develop clean next-generation energy and are focused on with great interest. In this study, solid-state hydrogen fuel (PSII–chitin composite) composed of the photosystem II (PSII) and hydrated chitin composite was successfully created. Moreover, a biofuel cell consisting of the electrolyte of chitin and the hydrogen fuel using the PSII–chitin composite was fabricated, and its characteristic feature was investigated. We found that proton conductivity in the PSII–chitin composite increases by light irradiation. This result indicates that protons generate in the PSII–chitin composite by light irradiation. It was also found that the biofuel cell using the PSII–chitin composite hydrogen fuel and the chitin electrolyte exhibits the maximum power density of 0.19 mW/cm2. In addition, this biofuel cell can drive an LED lamp. These results indicate that the solid-state biofuel cell based on the bioelectrolyte “chitin” and biofuel “the PSII–chitin composite” can be realized. This novel solid-state fuel cell will be helpful to the fabrication of next-generation energy.

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Role of acetyl group on proton conductivity in chitin system

Cited by 12 publications

References 5 publications

Novel Biofuel Cell Using Hydrogen Generation of Photosynthesis

Novel Biofuel Cell Using Hydrogen Generation of Photosynthesis

Anomalous Proton Conductivity in Chitin-Chitosan Mixed Compounds

Solid-State Hydrogen Fuel by PSII–Chitin Composite and Application to Biofuel Cell

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