Journal of Physical Chemistry C
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2014
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IF 4.835
Jianjun Ding,Bin Hong,Zhenlin Luo,Song Sun,Jun Bao,Chen Gao
A novel ternary sulfide photocatalyst of monoclinic CaIn2S4 with excellent photocatalytic H2 evolution activity is synthesized via a high-temperature sulfurization approach. The precursor orthorhombic CaIn2O4 can be converted in situ to monoclinic CaIn2S4 by using H2S gas as the sulfurization reagent once the sulfurization temperature exceeds 773 K. The obtained yellow powders have a mesoporous structure and a chain-shape morphology with large surface area and high pore volume. SEM and TEM observations indicate that specific nanostep structures are formed on the surface of monoclinic CaIn2S4. Under visible light irradiation, monoclinic CaIn2S4 exhibits considerable performance for photocatalytic hydrogen production. A high H2 evolution rate of 30.2 μmol/h with good stability is achieved from Na2S/Na2SO3 aqueous solution with the deposition of 0.5 wt % Pt nanoparticles, 30 times higher than that of cubic CaIn2S4, which makes it a new promising candidate photocatalyst for hydrogen production. This work can provide an effective approach to the fabrication of other mesoporous sulfide photocatalysts with high performance.
研究领域:
材料科学
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化学
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能源
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纳米技术
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光催化
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DOI
高影响因子
APPLIED SURFACE SCIENCE
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2026
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IF 6.9
Chao Liu,Shangshang Wang,Jingting Sun,Zhuangzhi Yu,Yuxi Song,Qinfang Zhang,Zhigang Zou
Photocatalytic oxygen reduction reaction (ORR) in seawater provides an efficient, cost-effective and sustainable pathway for hydrogen peroxide (H 2 O 2 ) production. However, developing the stable and high-efficiency seawater photocatalysts remains a crucial challenge due to the high concentration of Cl − and rapid charge carrier recombination rate. Here we fabricated 2D/2D CuS/CaIn 2 S 4 (CuS/CIS) heterostructured photocatalysts for visible-light-driven H 2 O 2 photosynthesis from seawater and O 2 under ambient condition. The introduction of CuS in CuS/CIS composites benefited superior light harvesting and the charge carrier separation. The optimized 5-CuS/CIS had an exceptional H 2 O 2 photosynthesis rate of 1194.0 μmol∙g −1 ∙h −1 with stable reusability in seawater, outperforming their counterparts. Additionally, 5-CuS/CIS possesses the higher H 2 O 2 photosynthesis rate in seawater and single salt-based solutions than that in deionized water. The corresponding enhancement mechanism of H 2 O 2 photosynthesis in seawater was discussed in depth. Thorough experimental analysis and theoretical calculations corroborate the two-step one-electron ORR path for H 2 O 2 photosynthesis. Through systematic characterization, we pinpoint the photo-reduction active sites governing H 2 O 2 formation and reveal optimized interfacial charge transfer pathways. This study offers new insights into designing stable heterostructured photocatalysts to facilitate charge carrier separation and achieve high-efficiency for H 2 O 2 photosynthesis from seawater.
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DOI
高影响因子
MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
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2026
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IF 5.2
Yuanyuan Wang,Peidong Huang,Jinshun Xu,Yingfei Hu,Weiwei Shao,Runhua Qin,Chi Zhang
To mitigate the challenges of rapid charge carrier recombination and restricted visible light absorption inherent in single-semiconductor photocatalysts for Cr(VI) reduction, a 2D/2D Z-scheme CaIn 2 S 4 /CeO 2 heterojunction was engineered. The optimized materials exhibited Cr(VI) reduction rate constants that were 3.4-fold and 20.8-fold greater than those of pristine CaIn 2 S 4 and CeO 2 , respectively. Nevertheless, critical limitations are apparent. The efficacy of the Z-scheme mechanism, which depends on electron transfer and surface-generated •O 2 − species, becomes rate-limiting under elevated Cr(VI) concentrations, with efficiency decreasing from approximately 98% at 40 mg/L to ∼76% at 60 mg/L. Furthermore, the photocatalytic system displays pronounced pH sensitivity, with neutral and alkaline conditions substantially suppressing activity owing to the formation of CrO 4 2− and surface passivation. Cyclic durability assessments revealed a progressive deactivation trend, with reduction efficiency declining from 98% to 84% over four reaction cycles, indicative of material attrition or active site poisoning. In conclusion, while the CaIn 2 S 4 /CeO 2 heterojunction demonstrates high photocatalytic efficacy, its performance is contingent on specific operational parameters, and its advantages are not universally applicable across varying concentrations or pH regimes. This research, therefore, offers not only a high-performance photocatalyst but also a crucial cautionary perspective, emphasizing the necessity of balancing interfacial charge transfer efficiency with the availability of reactive oxygen species and the prevailing reaction environment.
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DOI
高影响因子
ACS Applied Materials & Interfaces
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2018
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IF 8.097
Jianjun Ding,Xiangyang Li,Lin Chen,Xian Zhang,Hao Yin,Xingyou Tian
Photocatalytic hydrogen production from water exhibits great potential for solar energy conversion. In this work, using monoclinic CaIn2S4 with a surface nanostep structure as a model photocatalyst, we demonstrate a facile and efficient strategy for the construction of AOx/AuCu/CaIn2S4 (A = Mn, Ni, and Pb) composites by site-selective photodeposition of the reductive cocatalyst AuCu alloy and oxidative cocatalyst AOx on the edge and groove sites of CaIn2S4 nanosteps, respectively. Compared to single-cocatalyst composites (AuCu/CaIn2S4 and AOx/CaIn2S4) and CaIn2S4, the simultaneous deposition of AuCu and AOx spatially separate the photogenerated charges and the photocatalytic reaction sites, therefore effectively improving the separation efficiency of charge carriers. Meanwhile, the synergistic effect of AuCu and AOx dual cocatalysts notably reduces the apparent activation energy for the photocatalytic hydrogen production reaction. These novel dual-cocatalyst composites show enhanced performance for hydrogen production under visible light irradiation. A high rate of hydrogen production of 95.75 mmol h–1 g–1 is achieved over the MnOx/AuCu/CaIn2S4 composite with the deposition of 0.5 wt % AuCu and 0.2 wt % MnOx. Our work sheds new lights on designing efficient photocatalytic materials with site-selective surface deposition of reductive and oxidative dual cocatalysts for solar energy conversion.
研究领域:
材料科学
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能源化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
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