Investigation of porous silicon thin films for electrochemical hydrogen storage

Merazga, S.; Cheriet, A.; M’hammedi, Kawthar; Mefoued, A.; Gabouze, N.

doi:10.1016/j.ijhydene.2019.03.017

Cited by 31 publications

(4 citation statements)

References 50 publications

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“…An inevitable oxidation occurred during the etching process, as described in the literature [15,29]. The formation of SiH 2 was also observed in the work [30]. Both of these functionalities could be involved in pseudocapacitive performance, while SiO 2 could also influence the redox reaction kinetics, as will be discussed below.…”

Section: Sample Characterizationsupporting

confidence: 64%

“…The HS capacity calculated from the GCD profile of this sample at low current density (see Figure S8c, SM) was about 20 mAh/g. There have been better values reported in the literature [21,30] during measurements in 3 M H 2 SO 4 , but the results we achieved demonstrate the ability to use our structures as HS devices. Targeted research in this direction could lead to improved HS performance.…”

Section: Comparison Of Resultsmentioning

confidence: 44%

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Nanoporous Silicon with Graphene-like Coating for Pseudocapacitor Application

et al. 2022

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This paper presents the results of studies of the nanoporous silicon structure, both with different pore depths (up to 180 μm) and with layers in which a graphene-like coating was synthesized on the inner surface of the pores. The nanoporous layers were characterized by SEM as well as IR and Raman spectroscopy. Cyclic voltammetry and galvanostatic charge–discharge data in 3 M H2SO4 are presented as well as the results of the cyclic stability of these characteristics for the nanoporous structure. It was found that the degree of electrolyte pre-impregnation significantly affected the electrochemical processes, and the capacitance values depended on the depth (thickness) of the nanoporous layer. Increasing the thickness of the porous layer led to an increase in area-normalized pseudocapacity and was limited only by the mechanical strength of the structure. Performance improvement was also achieved by synthesis of the graphene-like layer in the volume of the nanoporous structure. The electrodes (composite materials) proposed in the work showed one of the best capacitive characteristics (87 mF/cm2 with 100% capacity retention after 15,000 cycles) in comparison with the data reported in the literature at present.

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Section: Sample Characterizationsupporting

confidence: 64%

Section: Comparison Of Resultsmentioning

confidence: 44%

Nanoporous Silicon with Graphene-like Coating for Pseudocapacitor Application

et al. 2022

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“…The main characteristic of NPSi which prevails in most cases of practical applications is a very significant specific surface area (up to 1000 m 2 /g). The first research materials on the storage of hydrogen in the volume of NPSi have already been published [1][2][3][4]. Further development of work in this direction will make it possible to integrate such a hydrogen source with its consumers on a single silicon wafer.…”

Section: Introductionmentioning

confidence: 99%

Nanoporous Layers and the Peculiarities of Their Local Formation on a Silicon Wafer

et al. 2022

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This review presents the results of the local formation of nanostructured porous silicon (NPSi) on the surface of silicon wafers by anodic etching using a durite intermediate ring. The morphological and crystallographic features of NPSi structures formed on n- and p-type silicon with low and relatively high resistivity have also been investigated. The proposed scheme allows one to experiment with biological objects (for example, stem cells, neurons, and other objects) in a locally formed porous structure located in close proximity to the electronic periphery of sensor devices on a silicon wafer.

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“…More than 20 years after the initial discovery of porous silicon (pSi) photoluminescence by Professor Canham, and his subsequent work on the fabrication of bioactive pSi [1], there remains significant ongoing interest in its biomedical applications, including therapeutic delivery, medical imaging, and theranostics [2][3][4][5][6][7][8][9][10][11][12][13]. PSi possesses a highly tuneable porous nanostructured network and can be fabricated into a variety of different forms, ranging from thin films [14], nanowires [15], and micro-and nanoparticles [6,[16][17][18]. PSi is typically produced via an electrochemical etching process (e.g., see [19]); however, there are ongoing efforts to more efficiently produce pSi nanoparticles (e.g., [20]).…”

Section: Introductionmentioning

confidence: 99%

Controlling and Predicting the Dissolution Kinetics of Thermally Oxidised Mesoporous Silicon Particles: Towards Improved Drug Delivery

2019

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Porous silicon (pSi) continues to receive considerable interest for use in applications ranging from sensors, biological scaffolds, therapeutic delivery systems to theranostics. Critical to all of these applications is pSi degradation and stabilization in biological media. Here we report on progress towards the development of a mechanistic understanding for the dissolution behavior of native (unoxidized) and thermally oxidized (200–600 °C) pSi microparticles. Fourier transform infrared (FTIR) spectroscopy was used to characterize the pSi surface chemistry after thermal oxidation. PSi dissolution was assessed using a USP method II apparatus by monitoring the production of orthosilicic acid, and the influence of gastro-intestinal (GI) fluids were examined. Fitting pSi dissolution kinetics with a sum of the exponential model demonstrated that the dissolution process strongly correlates with the three surface hydride species and their relative reactivity, and was supported by the observed FTIR spectral changes of pSi during dissolution. Finally, the presence of GI proteins was shown to hamper pSi dissolution by adsorption to the pSi surface acting as a barrier preventing water attack. These findings are significant in the optimal design of pSi particles for oral delivery and other controlled drug delivery applications.

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Investigation of porous silicon thin films for electrochemical hydrogen storage

Cited by 31 publications

References 50 publications

Nanoporous Silicon with Graphene-like Coating for Pseudocapacitor Application

Nanoporous Silicon with Graphene-like Coating for Pseudocapacitor Application

Nanoporous Layers and the Peculiarities of Their Local Formation on a Silicon Wafer

Controlling and Predicting the Dissolution Kinetics of Thermally Oxidised Mesoporous Silicon Particles: Towards Improved Drug Delivery

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