Manganese Cadmium Sulfide Nanoparticles Solid Solution on Cobalt Acid Nickel Nanoflakes: A Robust Photocatalyst for Hydrogen Evolution

Abstract

Photocatalytic water splitting for hydrogen evolution is one of the most promising methods to mitigate environmental and energyrelated issues. In this study, manganese cadmium sulfide (Mn x Cd 1x S) solid solution is used to construct a p-n heterostructure with NiCo 2 O 4 through a hydrothermal method. The Mn 0.25 Cd 0.75 S/ NiCo 2 O 4 composites are used for photocatalytic hydrogen evolution reaction, and the optimal hydrogen rate with 40 mg of Mn 0.25 Cd 0.75 S/NiCo 2 O 4 40 mg (MCS/NCO 40) is 61159 μmol g À 1 h À 1 , which is about 16.3 times than that of pure Mn 0.25 Cd 0.75 S. After combining with NiCo 2 O 4 , the light absorption scale, the separation efficiency of photogenerated carriers, and the reaction kinetics are enhanced. Moreover, the band offset of MCS/NCO composites is calculated by the core level alignment method, demonstrating the formation of a p-n heterostructure. The built-in electric field from the p-n heterostructure drives charge transfer and enhances separation efficiency, which results in improved photocatalytic performance.

Synergistic optimization of triple phase junctions and oxygen vacancies over MnxCd1−xS/Ov-WO3 for boosting photocatalytic hydrogen evolution

“…Compared with the characteristic peak position of CdS, the peaks of Mn x Cd 1−x S shift towards a higher angle with an increase in the Mn 2+ molar Dalton Transactions Paper ratio. 21,32,44 Compared with the peaks of CdS and MnS, the peaks of Mn 0.5 Cd 0.5 S exhibit a significant shift. This shift in the angle is a clear indication that the Mn 0.5 Cd 0.5 S solid solution has been successfully fabricated.…”

“…S6 †). 36,44,45 The excellent photocatalysts need a reasonable CB potential and VB potential in addition to having an appropriate bandgap energy. 35 Furthermore, the VB potentials of the t-MCS and Ov-WO 3 are 1.15 eV and 2.65 eV attained from XPS VB spectra, respectively (Fig.…”

Room Temperature Exsolution of Cds Nanodots on A‐site Deficient Cotton‐Ball Like Titanate Perovskite Nanoparticles for H2 Production Under Visible Light

“…Furthermore, to prove the state of the art of this current work, the mass activity of CdS exsolved La 0.4 Sr 0.4 Cd 0.05 Ti 0.95 O 3‐δ with reported values was also compared (Table S2, Supporting Information). [ 9,30–33 ] Furthermore, we have also compared our results with some previously reported Pt co‐catalyst‐loaded photocatalysts and summarized in Table S3, Supporting Information. [ 34–40 ] Such improvements in photocatalytic property revealed the influence of strong interaction between CdS nanodots and perovskite support which has been established by XPS.…”

0D/2D Co0.85Se/TiO2 p–n heterojunction for enhanced photocatalytic H2 evolution

“…However, and are 1.71 eV and 0.13 eV before contact, illustrating the shift of the Fermi level after contact of TiO 2 and Co 0.85 Se and the formation of the p–n heterojunction. 61…”

“…The binding energy between Co 2p 3/2 and Ti 2p 3/2 in 15%-Co 0.85 Se/TiO 2 is presented in Fig. 9c 61 To further explore the mechanism for enhanced performance of Co 0.85 Se/TiO 2 , the reaction pathway was further probed based on free radical capture tests. ˙OH can be captured by terephthalic acid (TA) to form dihydroxyterephthalic acid, which has a stronger PL emission peak at 425 nm.…”