Kinetic analysis of photoelectrochemical hydrogen evolution over p-type silicon in acidic aqueous solutions of electrolytes

Abstract

The kinetics of photoelectrochemical hydrogen evolution at p-St single crystals m acidic aqueous soluliolls of electrolytes under pulse photoexciration was studied. Despite a low stability oF the silicon surface under the experimental conditions, a distract interrelation between the characteristic time of interlhcial charge transi~:r and stationary current was tbund. The determination of the characteristic transfer time does not need the detailed elaboration of generation-recombination processes in the semiconductor. The steady-state current density was shov, n to be determined both for the dark current and photocurrent by the. surface charge density.

Enabling Silicon for Solar-Fuel Production

“…40 Chemical Reviews Therefore, simplified discussions here on factors that could affect the charge-transfer kinetics of Si photoelectrode will be conducted based on the conventional model. In the conventional model, the charge-transfer kinetics on a bare Si interface without catalysts depend on the change of the surface charge density, 41 which is involved in processes such as charge storage at the surface, charge transfer to the solution, and charge recombination. Both the charge-transfer and the recombination rates depend on the illumination intensity and the bias.…”

“…In the conventional model, the charge-transfer kinetics on a bare Si interface without catalysts depend on the change of the surface charge density, which is involved in processes such as charge storage at the surface, charge transfer to the solution, and charge recombination. Both the charge-transfer and the recombination rates depend on the illumination intensity and the bias .…”

Solar‐Energy‐Driven Photoelectrochemical Biosensing Using TiO2 Nanowires

“…[18] The photoelectrochemical( PEC) method is ar ecently developed approach for chemicala nd biomolecular analysis.T he basic principle of PEC is the photo-to-electric conversion of as emiconducting material, in which charge carriers (electrons or holes) are photoexcited and subsequently transferred. [22,23] When the semiconductor surfacei sf unctionalized with ar eceptor layer that can specifically recognize and bind to molecular targets of interest in as olution, the photocurrentd ensity of the semiconductor is tuned. The charge-transfer kinetics at semiconductor/electrolyte interface is based on the change of the surfacec harged ensity,w hich is involved in processes such as charge storage at the surface, charge transfer to the solution,a nd charger ecombination.…”

“…The charge‐transfer kinetics at semiconductor/electrolyte interface is based on the change of the surface charge density, which is involved in processes such as charge storage at the surface, charge transfer to the solution, and charge recombination 22. 23 When the semiconductor surface is functionalized with a receptor layer that can specifically recognize and bind to molecular targets of interest in a solution, the photocurrent density of the semiconductor is tuned 24. 25 For the electron transfer that occurs between the surface site and the bound molecules, the driving force for the heterogeneous electron transfer is the energy difference between the conduction band of the semiconductor and the reduction potential of the acceptor redox couple 22.…”

Nanostructured p-Type Semiconductor Electrodes and Photoelectrochemistry of Their Reduction Processes

“…Results of the photoelectrochemical performance achieved with PECs utilizing RGO-based photocathodes are reported in Table 4. Finally, we report now on the photoelectrocatalytic activity of p-Si based photocathodes for HER when silicon has different morphologies (nanowires, micropyramidal, nanomesh), various degree of doping (p-, n + and n + pp + ), and diverse types of photoelectrocatalyst (metallic, p-type semiconducting, metal alloy) [63,97,99,111,[125][126][127][128][129][130][131][132][133][134][135][136][137]. A scheme of the energy levels involved in the interface p-Si/electrolyte for HER is given in Figure 19 [126].…”