Interstitial P‐Doped CdS with Long‐Lived Photogenerated Electrons for Photocatalytic Water Splitting without Sacrificial Agents

Abstract

Photocatalytic hydrogen evolution from pure water is successfully realized by using interstitial P-doped CdS with rich S vacancies (CdS-P) as the photocatalyst in the absence of any electron sacrificial agents. Through interstitial P doping, the impurity level of S vacancies is located near the Fermi level and becomes an effective electron trap level in CdS-P, which can change dynamic properties of photogenerated electrons and thus prolong their lifetimes. The long-lived photogenerated electrons are able to reach the surface active sites to initiate an efficient photocatalytic redox reaction. Moreover, the photocatalytic activity of CdS-P can be further improved through the loading of CoP as a cocatalyst.

Direct Z‐Scheme Hetero‐phase Junction of Black/Red Phosphorus for Photocatalytic Water Splitting

“…Surprisingly,O 2 was not detected. [22] Although the valence band position of the materials allows the formation of O 2 and H 2 O 2 ,compared to the concerted four-electron process for O 2 evolution, these species formed H 2 O 2 via the two-electron process is kinetically more favorable. As the photocatalytic reaction proceeded, as mall amount of H 2 O 2 was also detected ( Figure S24).…”

A [001]‐Oriented Hittorf's Phosphorus Nanorods/Polymeric Carbon Nitride Heterostructure for Boosting Wide‐Spectrum‐Responsive Photocatalytic Hydrogen Evolution from Pure Water

“…Interestingly, no O 2 evolution by four-electron water oxidation was observed (Supporting Information, Figure S13). Instead, hydrogen peroxide (H 2 O 2 )w ere produced by photoholes via at wo-electron process of water oxidation, [15,22] with the H 2 :H 2 O 2 ratio (1:0.9) close to 1:1( Supporting Information, Figures S14, S15). Moreover,P CN@HP(0.4) still retained 90.4 %o fi ts original photocatalytic HER rate after a1 6h continuous light irradiation, revealing its reasonable photocatalytic durability (Supporting Information, Figure S16).…”

Construction of Defective Zinc–Cadmium–Sulfur Nanorods for Visible‐Light‐Driven Hydrogen Evolution Without the Use of Sacrificial Agents or Cocatalysts

“…It is well known that defective states cause a defect energy level between CB and VB, which thereby narrows the semiconductor band gap . The blueshifted DRS and slightly enlarged band gap of S‐treated ZCS demonstrate clearly that the defective state energy level that corresponds to S vacancies exists in the ZCS sample . The VB position remains unchanged and is 1.04 eV below the fermi level for both ZCS and S‐treated ZCS (Figure a), whereas the E g of S‐treated ZCS changed from 2.69 for the ZCS sample to 2.81 eV (inset of Figure S12).…”