Electron Conductive and Proton Permeable Vertically Aligned Carbon Nanotube Membranes

Pilgrim, Gregory A.; Leadbetter, Joanne W.; Qiu, Fen; Siitonen, Anni; Pilgrim, S.M.; Krauss, Todd D.

doi:10.1021/nl403696y

Cited by 26 publications

(35 citation statements)

References 47 publications

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“…The three techniques agree closely, with CNT densities averaging 5.2 × 10 11 , 5.1 × 10 11 , and 6.5 × 10 11 CNT cm −2 for weight gain, X‐ray attenuation, and KCl diffusion, respectively. These density values correspond to a porosity of 4.4%–5.5%, which is greater than those of previously reported CNT membranes fabricated from as‐grown CNT forests or CNT dispersion . Note that a large porosity is desirable to boost breathability.…”

mentioning

confidence: 65%

Ultrabreathable and Protective Membranes with Sub‐5 nm Carbon Nanotube Pores

et al. 2016

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confidence: 65%

Ultrabreathable and Protective Membranes with Sub‐5 nm Carbon Nanotube Pores

et al. 2016

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“…Considerable effort has been devoted to the understanding, control and design of cost-effective membranes 10–17 . However, progress along this direction is slow due to the complicated structures of such membranes.…”

Section: Introductionmentioning

confidence: 99%

Nitrogen-Mediated Graphene Oxide Enables Highly Efficient Proton Transfer

Chai

Shevlin

Guo

2017

Sci Rep

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Two-dimensional (2D) graphene and graphene oxide (GO) offer great potential as a new type of cost-efficient proton-exchange membranes (PEM) for electrochemical devices. However, fundamental issues of proton transfer mechanism via 2D membranes are unclear and the transfer barrier for perfect graphene are too high for practical application. Using ab initio molecular dynamic simulations, we screened the proton transfer barrier for different un-doped and nitrogen doped GO membranes, and clarified the corresponding transfer mechanisms. More significantly, we further identify that N-mediated GO can be built into a highly efficient PEM with a proton transfer rate of seven orders of magnitude higher than an un-doped case via. a proton relay mechanism between a ketone-like oxygen and a pyridine-like nitrogen across the vacancy site. The N-doped 2D GO is also impermeable to small molecules, and hence a highly efficient PEM for practical applications.

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“…The solution-semiconductor interface leads to a space charge region with p-type semiconductors favored for moving electrons to the solution interface as photocathodes and n-type semiconductors favored for moving electrons to the bulk as photoanodes. In addition to the challenges of the photoelectrodes for each half-reaction of water splitting, there is also the overall "system" task of moving electrons and protons from photoanode to photocathode by separate and distinct paths (22,23).…”

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confidence: 99%

Semiconductor quantum dot-sensitized rainbow photocathode for effective photoelectrochemical hydrogen generation

Wang

et al. 2017

Proc. Natl. Acad. Sci. U.S.A.

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The present study reports the fabrication of CdSe quantum dot (QD)-sensitized photocathodes on NiO-coated indium tin oxide (ITO) electrodes and their H-generating ability upon light irradiation. A well-established spin-coating method was used to deposit CdSe QD stock solution onto the surface of NiO/ITO electrodes, thereby leading to the construction of various CdSe QD-sensitized photocathodes. The present report includes the construction of rainbow photocathodes by spin-coating different-sized QDs in a sequentially layered manner, thereby creating an energetically favorable gradient for charge separation. The resulting rainbow photocathodes with forward energetic gradient for charge separation and subsequent electron transfer to a solution-based hydrogen-evolving catalyst (HEC) exhibit good light-harvesting ability and enhanced photoresponses compared with the reverse rainbow photocathodes under white LED light illumination. Under minimally optimized conditions, a photocurrent density of as high as 115 μA⋅cm and a Faradaic efficiency of 99.5% are achieved, which is among the most effective QD-based photocathode water-splitting systems.

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Electron Conductive and Proton Permeable Vertically Aligned Carbon Nanotube Membranes

Cited by 26 publications

References 47 publications

Ultrabreathable and Protective Membranes with Sub‐5 nm Carbon Nanotube Pores

Ultrabreathable and Protective Membranes with Sub‐5 nm Carbon Nanotube Pores

Nitrogen-Mediated Graphene Oxide Enables Highly Efficient Proton Transfer

Semiconductor quantum dot-sensitized rainbow photocathode for effective photoelectrochemical hydrogen generation

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