Broadband Light Harvesting and Unidirectional Electron Flow for Efficient Electron Accumulation for Hydrogen Generation

Abstract

The efficiency of solar hydrogen evolution closely depends on the multiple electrons accumulation on the catalytic center for two-electron-involved water reduction. Herein, we report an effective approach to enable broadband light absorption and unidirectional electron flow for efficiently accumulating electrons at active sites for hydrogen evolution by rationally engineering the nanostructure of Pt nanoparticles (NPs), TiO 2 ,a nd SiO 2 support. In addition to Schottkyjunction-driven electron transfer from TiO 2 to Pt, Pt NPs also produce hot electrons by recycling the scattered visible and near-infrared (vis-NIR) light of the support. Unidirectional electron flow to active sites is realized by tuning the components spatial distribution. These features collectively accumulate multiple electrons at catalytic Pt sites,t herebya ffording enhanced activity towardhydrogen evolution under simulated sunlight.Supportinginformation and the ORCID identification number(s) for the author(s) of this article can be found under https://doi.

Unexpected Boosted Solar Water Oxidation by Nonconjugated Polymer-Mediated Tandem Charge Transfer

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“…3 -(PDDA) 2 (0.1047 s) and it is almost 3 times longer than that of WO 3 NPAs (0.0723 s). Notably, Bode phase plots agree well with the LSV, electron lifetime, and EIS results.Photocurrent transient dynamics were quantitatively determined by the I−t results [Figure3h(I)] to evaluate the recombination behavior of charge carriers over the photoelectrode through introducing a normalized parameter (D)37 …”

Efficient photocatalytic hydrogen evolution over carbon supported antiperovskite cobalt zinc nitride

“…Co 3 ZnN/C(1:1) sample displays the highest current density and lowest over-potential, which is attributed to the fact that the spatial distribution of Co 3 ZnN in the composites enables the exposure of more available active sites on the Co 3 ZnN surface [35]. Electrochemical impedance spectroscopy (EIS) spectra are shown in Fig.…”

Titanium Nitride-Supported Platinum with Metal–Support Interaction for Boosting Photocatalytic H2 Evolution of Indium Sulfide

“…18 Zhang and co-workers using SiO 2 nanosphere as a support couple with Pt nanoparticles fabricating SiO 2 /Pt/TiO 2 nanocomposites. 19 In addition to Schottky-junction-driven electron transfer from TiO 2 to Pt, Pt nanoparticles also produce hot electrons by recycling the scattered visible and near-infrared (vis-NIR) light of the support. This synergistically increases the electron density over Pt nanoparticles and thus promotes photoactivity of the composite for hydrogen production under simulated sunlight.…”