Earth-abundant WC nanoparticles as an active noble-metal-free co-catalyst for the highly boosted photocatalytic H₂ production over g-C₃N₄ nanosheets under visible light

Abstract

Enhanced visible-light photocatalytic H2 evolution over g-C3N4 nanosheets modified by earth-abundant WC nanoparticles as an active noble-metal-free co-catalyst.

WXy/g‐C3N4 (WXy=W2C, WS2, or W2N) Composites for Highly Efficient Photocatalytic Water Splitting

“…SEM images of (a) W 2 C/g-C 3 N 4 ,(b) W 2 N/g-C 3 N 4 and (c)WS 2 /g-C 3 N 4 ;TEM images(inset:E DS elemental mappings) of (d) W 2 C/g-C 3 N 4 ,( e) W 2 N/g-C 3 N 4 and (f) WS 2 /g-C 3 N 4 ;H RTEM images of( g) W 2 C/g-C 3 N 4 ,(h) W 2 N/g-C 3 N 4 and (i)WS 2 /g-C 3 N 4 .The Cu film is used as the substrate in the SEMm easurement. [24] Similarly,t he excessive loading of WS 2 /W 2 Nl ed to the reductiono fp hotocatalytic performance. The photocatalytic activity of g-C 3 N 4 was gradually improvedw ith the increase of W 2 Cc ontent,a nd the optimal loading of W 2 Cw as approximately 2wt% (WCCN-2), which displayed the highest H 2 -evolution rate of 98 mmol h À1 .The hydrogen production rate of WCCN-2 was approximately 50 times higher than that of pure g-C 3 N 4 .T he photocatalytic activityo f g-C 3 N 4 decreased with continuous increaseo fW 2 Cc ontent owing to the mask effects.…”

“…The photocatalytic activity of g-C 3 N 4 was gradually improvedw ith the increase of W 2 Cc ontent,a nd the optimal loading of W 2 Cw as approximately 2wt% (WCCN-2), which displayed the highest H 2 -evolution rate of 98 mmol h À1 .The hydrogen production rate of WCCN-2 was approximately 50 times higher than that of pure g-C 3 N 4 .T he photocatalytic activityo f g-C 3 N 4 decreased with continuous increaseo fW 2 Cc ontent owing to the mask effects. [24] Similarly,t he excessive loading of WS 2 /W 2 Nl ed to the reductiono fp hotocatalytic performance. The optimal loadings were approximately 2a nd 7wt% forW S 2 and W 2 N, respectively,w hich had H 2 evolution rates of 27 and 25 mmol h À1 (Figure 4b,c).…”

“…[20][21][22][23][24] Particularly, these tungsten compounds are potential substitutes for precious Pt in HER because of their similar electronic structures. [20][21][22][23][24] Particularly, these tungsten compounds are potential substitutes for precious Pt in HER because of their similar electronic structures.…”

“…Tungsten-based compounds, such as sulfides, carbides and nitrides, are promising noble-metal-free catalysts and have been widely used in hydrodesulfurization (HDS), oxygen reduction reaction( ORR), HER and photocatalysis. [20][21][22][23][24] Particularly, these tungsten compounds are potential substitutes for precious Pt in HER because of their similar electronic structures. [25][26][27] Amongt ungsten compounds, tungsten-based sulfides have been widely investigated as active HER catalysts.…”

A new mechanism for improving electromagnetic properties based on tunable crystallographic structures of FeCoNiSixAl0.4 high entropy alloy powders

“…The diffraction peaks of BCC phase are obscure and even no peak of the (110) crystal face is observed, which could be due to the low content and the relatively low diffraction intensity. [30][31][32] The peaks of Si at around 33.2 and 55.5 can be indexed as the (111) and (220) diffraction planes of Si (JCPDS, no. 27-1402), respectively.…”