Enhancing Electrochemical Hydrogen Generation by Platinum-Modification of p-Type Silicon Wires Array under Visible Light

Abstract

An electrochemical study involving the pulse electrodeposition of platinum onto p-type silicon nanowires array in non-fluoride solution for photo enhanced electrochemical hydrogen generation is presented. Pt was deposited onto the surface of silicon nanowires array (light trapping layer) as a photocatalyst with a radial multi-layers nanocluster structure, of which the photocurrent density of hydrogen generated was increased by about 300% compared to the bare silicon nanowires array under simulated solar radiance, while the value of onset potential also positively shifted to 0.40 V. Furthermore, the impedance of Pt/silicon nanowires array was smaller than that of bare silicon nanowires array as indicated by EIS analysis. We tentatively ascribed the mechanism of enhancement to the effect of the Schottky junction at the Pt/silicon nanowires array interface.

Novel MOF-Derived Nickel Nitride as High-Performance Bifunctional Electrocatalysts for Hydrogen Evolution and Urea Oxidation

“…Additionally, in the plot of electrochemical impedance spectroscopy (EIS), two semicircles can be observed (Figure (c)). The highly frequent semicircle displayed an association with the transfer resistance of surface charge (R ct ), and the less frequent semicircle is connected with hydrogen desorption impedance variations (R ad ). , Accordingly, a comparison was drawn between R ad and R ct of C-350 prior to and after the test of stability (Figure (d)), and R ct was identified to increase from 2.66 to 2.69 Ω and R ad rise from 11.75 to 12.53 Ω, separately, prior to and after the stable state experiment. The variation of R ad is noticeably more obvious compared with R ct.…”

Nanostructured Nickel Nitride with Reduced Graphene Oxide Composite Bifunctional Electrocatalysts for an Efficient Water-Urea Splitting

“…Clearly, the Tafel slope of s-350 ranked the closest to Pt/C, which indicates its efficient performance for the HER. Generally speaking, the hydrogen evolution reaction was achieved by transition metal composite materials following the Tafel–Volmer–Heyrosky mechanism in the alkaline medium (Equations (4)–(6)) [45]. The crucial role of the formation of transition (M–H*) is the rate determining step (Tafel–Volmer step, Equation (6)) [46].…”

Pulse Electrodeposition of Palladium Nanoparticles onto Silicon in DMSO

“…By varying the electrolyte composition, the values of the cathodic potential or current density, and the methods of current supply (stationary, cyclic, and pulsed), it is possible to obtain MNPs of various shapes and sizes on the silicon surface. Most of the studies on electrochemical production of MNPs/Si surface systems have been performed in aqueous solutions (see Table 1) [9][10][11][12][13][14][15][16][17][18][19][20][21][22][23][24][25][26][27][28]. However, the water factor as a medium does not always provide the ability to control the geometry of MNPs at the main stages of their formation: cathodic reduction (1), nucleation, i.e., formation of metal nanoclusters (MNCs) (2), and nanoparticles (3).…”