In:
New Journal of Chemistry, Royal Society of Chemistry (RSC), Vol. 47, No. 4 ( 2023), p. 1825-1831
Abstract:
Photocatalytic H 2 O-to-H 2(g) and –H 2 O 2(aq) (2H 2 O (l) → H 2(g) + H 2 O 2(aq) ) by a two-electron reaction is kinetically feasible. The proton-coupled two-electron transfer induced a photocatalytic oxygen reduction reaction (ORR) from oxygen and water is also an accessible path for the safe production of H 2 O 2 . It is thus desirable to synthesize effective photocatalysts that yield H 2 O 2 by the coupling of two-electron transfer water oxidation (+1.23 V NHE ) and ORR (+0.68 V NHE ). In this work, new g-C 3 N 4 /BiOI S-scheme heterojunctions with co-catalyst cobalt phosphide (CoP) (BiOI/g-C 3 N 4 /CoP) were prepared for the photocatalytic H 2 O-to-H 2 O 2 reactions. The BiOI/g-C 3 N 4 /CoP heterojunctions can enhance visible light absorption and reduce electron–hole pair recombination rates. Because of the water splitting by two-electrons and reduction of oxygen, the BiOI/g-C 3 N 4 /CoP heterojunctions have a better photocatalytic H 2 O-to-H 2 O 2 yield than with the BiOI/g-C 3 N 4 heterojunction by 3.0–8.4 times. With more CoP ( i.e. , 19 wt%) on the BiOI/g-C 3 N 4 , the BiOI/g-C 3 N 4 /(CoP) 0.19 heterojunction generates more photocatalytic H 2 O 2 with higher formation rate constant ( k f ), equilbrium constant ( K ), and a lower decomposition rate constant ( k d ). This new, low-cost and ready-prepared BiOI/g-C 3 N 4 /CoP S-scheme heterojunction has a high efficiency for the reversible photocatalytic H 2 O-to-H 2 O 2 reaction, which could be feasibly used for applications in H 2 O 2 -fuel cells for electricity using solar energy.
Type of Medium:
Online Resource
ISSN:
1144-0546
,
1369-9261
Language:
English
Publisher:
Royal Society of Chemistry (RSC)
Publication Date:
2023
detail.hit.zdb_id:
1472933-7
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