scispace - formally typeset
Journal ArticleDOI: 10.1021/ACS.JPCC.0C11554

Robust Co9S8@CdIn2S4 Cage for Efficient Photocatalytic H2 Evolution

02 Mar 2021-Journal of Physical Chemistry C (American Chemical Society)-Vol. 125, Iss: 9, pp 5099-5109
Abstract: We construct here a highly active and stable Co9S8@CdIn2S4 heterostructure for photocatalytic H2 evolution under visible light. In a hierarchical hollow construction with closely connected heteroge...

... read more

Citations
  More

5 results found


Journal ArticleDOI: 10.1039/D1TA02270A
Lu Chen1, Xiaoquan Dai1, Xiaojing Li1, Junfeng Wang1  +6 moreInstitutions (2)
Abstract: A novel Bi2S3/KTa0.75Nb0.25O3 (KTN) heterojunction nanocomposite was prepared through a simple two-step hydrothermal method and primarily applied in photocatalytic and piezocatalytic N2 fixation. Bi2S3 closely adhered to the surface of KTN nanorods and mainly acted as electron trappers to capture the photogenerated electrons in the composite, which promotes the spatial separation of photogenerated charge carriers greatly. Thus, Bi2S3/KTN exhibited good performance in photocatalytic N2 reduction to NH3. Besides the high photocatalytic performance in photocatalysis, Bi2S3/KTN also performed well in piezocatalytic N2 fixation. The remarkable piezoelectric properties of KTN are a key factor. The added Bi2S3 can extend the lifetime of the negative charges generated by the piezoelectric effect, thereby improving the catalytic reaction performance. This work demonstrates the great potential of Bi2S3/KTN in photo/piezocatalytic N2 fixation.

... read more

Topics: Photocatalysis (51%)

23 Citations


Journal ArticleDOI: 10.1016/J.IJHYDENE.2021.08.209
Xinyi Ma1, Zhuonan Lei1, Chenxuan Wang1, Zhongyuan Fu1  +3 moreInstitutions (1)
Abstract: Developing lower-cost and higher-efficient photocatalysts is still a major challenge for the solar to hydrogen energy conversion by photocatalytic water splitting. Herein, P-doped Co9S8 (P–Co9S8) was synthesized by a hydrothermal process using low-cost RP as raw material, and then P–Co9S8 was employed to construct heterojunction with g-C3N4 via a mechanical-mixing method. Investigation shows that P–Co9S8 can not only improve the electrical conductivity and surface area of the composite, but also can lower the over-potential of H2 evolution, leading to an enhanced H2 evolution kinetics. The H2 evolution rate of resultant 25% P–Co9S8/g-C3N4 reached 4362 μmol g−1 h−1 under UV and visible light, being nearly 121.2 times higher than that of g-C3N4. The charge transfer between P–Co9S8 and g-C3N4 follows the Type-I route based on the photoelectrochemical analysis, leading to more electrons on the conduction band of P–Co9S8 to participate the H2 evolution processes. This work provides a new way for preparation of P-doped sulfides with potential applications in the field of photocatalysis.

... read more

1 Citations


Journal ArticleDOI: 10.1016/J.JALLCOM.2021.162168
Minghui Yu1, Qi Hu1, Xiaoyu Gong1, Hao Yu1  +4 moreInstitutions (1)
Abstract: In this study, CdIn2S4/MoS2 composite structure was prepared by a simple two-step hydrothermal synthesis method, and the CdIn2S4/MoS2 composite structure samples were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS) and UV–vis diffuse reflectance spectroscopy (UV–vis). Due to the effective loading of MoS2 on the surface of CdIn2S4 particles, the photocatalytic performance of CdIn2S4/MoS2 composite material is significantly improved under visible light irradiation (λ = 420 nm), which indicating the effective inhibit the recombination of photogenerated electron holes. Meanwhile, the visible light response of CdIn2S4 is increased and the life of photoexcitation carrier is prolonged. The CdIn2S4/MoS2 (sample 2CM) composite sample with mole content of 9% has the highest catalytic hydrogen production activity, and its hydrogen production rate is 293 μmol h−1 g−1, which is more than 3 times that of sample C. After 4 cycles of photocatalytic experiments, the photocatalytic activity is still stable, and the XRD diffraction peak does not appear obvious shift, which provides a new way for the design and preparation of efficient and stable photocatalytic materials.

... read more

1 Citations


Journal ArticleDOI: 10.1016/J.SEPPUR.2021.119765
Abstract: Two-dimensional (2D) disk-like shape titanium oxide with controllable phase was prepared using NH2-MIL-125(Ti) as template by pyrolysis at different atmospheres process to acquire TiO2 (3.09 eV, air) and A/R-TiO2 (2.81 eV, N2). Subsequently, 2D/3D core–shell heterostructures (CdIn2S4@TiO2 and CdIn2S4@A/R-TiO2) were built by in-situ self-assembly tactics. Characterization displayed that the 3D CdIn2S4 shell with diameter 5.5 μm was uniformly wrapped on the surface of 2D A/R-TiO2 and TiO2 core with 3 μm. Compared with CdIn2S4@TiO2 (74.27 m2/g), the CdIn2S4@A/R-TiO2 possessed higher BET surface area (106.54 m2/g), providing larger contact areas and exposed more active sites. And CdIn2S4@A/R-TiO2-1.2 showed the best photocatalytic degradation and hydrogen production, which was much higher than that of CdIn2S4@TiO2-0.8. The mechanism of the proposed photocatalysis is further discussed: the CdIn2S4@TiO2 followed the Z-scheme mechanism while the Ti3+ and Ti4+ redox sites generated in A/R-TiO2 could be mutually transformed in situ and CdIn2S4@A/R-TiO2-1.2 followed the Ⅱ-scheme mechanism.

... read more

Topics: Titanium oxide (55%), Photocatalysis (53%), BET theory (50%)

Journal ArticleDOI: 10.1039/D1NR04812K
Xiahui Lin1, Zidong Xie1, Bo Su1, Mei Zheng1  +6 moreInstitutions (1)
30 Sep 2021-Nanoscale
Abstract: Exploring affordable cocatalysts with high performance for boosting charge separation and CO2 activation is an effective strategy to reinforce CO2 photoreduction efficiency. Herein, well-defined Co9S8 cages are exploited as a nonprecious promoter for visible-light CO2 reduction. The Co9S8 cages are prepared via a multistep strategy with ZIF-67 particles as the precursor and fully characterized by physicochemical techniques. The hollow Co9S8 cocatalyst with a high surface area and profuse catalytically active centers is discovered to accelerate separation and transfer of light-induced charges, and strengthen concentration and activation of CO2 molecules. In a hybrid photosensitized system, these Co9S8 cages efficiently promote the deoxygenative reduction of CO2 to generate CO, with a high yield rate of 35 μmol h−1 (i.e., 35 mmol h−1 g−1). Besides, this cocatalyst is also of high stability for the CO2 photoreduction reaction. Density functional theory (DFT) calculations reveal that the Ru(bpy)32+ photosensitizer is strongly absorbed on the Co9S8 (311) surface through forming four Co–C bonds, which can serve as the “bridges” to ensure quick electron transfer from the excited photosensitiser to the active Co9S8 cocatalyst, thus promoting the separation of photoexcited charges for ehannced CO2 reduction performance.

... read more

References
  More

48 results found


Journal ArticleDOI: 10.1039/C4CS00126E
Huanli Wang1, Lisha Zhang1, Zhigang Chen1, Junqing Hu1  +4 moreInstitutions (2)
Abstract: Semiconductor-mediated photocatalysis has received tremendous attention as it holds great promise to address the worldwide energy and environmental issues. To overcome the serious drawbacks of fast charge recombination and the limited visible-light absorption of semiconductor photocatalysts, many strategies have been developed in the past few decades and the most widely used one is to develop photocatalytic heterojunctions. This review attempts to summarize the recent progress in the rational design and fabrication of heterojunction photocatalysts, such as the semiconductor–semiconductor heterojunction, the semiconductor–metal heterojunction, the semiconductor–carbon heterojunction and the multicomponent heterojunction. The photocatalytic properties of the four junction systems are also discussed in relation to the environmental and energy applications, such as degradation of pollutants, hydrogen generation and photocatalytic disinfection. This tutorial review ends with a summary and some perspectives on the challenges and new directions in this exciting and still emerging area of research.

... read more

2,334 Citations


Open accessJournal ArticleDOI: 10.1038/NCOMMS2152
Jianhua Sun1, Jinshui Zhang1, Mingwen Zhang1, Markus Antonietti2  +2 moreInstitutions (2)
Abstract: Photosynthesis occurs at the thylakoid membrane, which acts as a scaffold, precisely arranging functional proteins and electron carriers. Sun et al. synthesize hollow photosynthetic nanospheres that function as light-harvesting antennae and structured scaffolds that improve photoredox catalysis.

... read more

Topics: Thylakoid (57%), Photoredox catalysis (52%)

710 Citations


Journal ArticleDOI: 10.1021/AM3026294
Jingfa Li1, Shenglin Xiong1, Yurong Liu1, Zhicheng Ju2  +2 moreInstitutions (2)
Abstract: Binary metal oxides have been regarded as ideal and potential anode materials, which can ameliorate and offset the electrochemical performance of the single metal oxides, such as reversible capacity, structural stability and electronic conductivity. In this work, monodisperse NiCo2O4 mesoporous microspheres are fabricated by a facile solvothermal method followed by pyrolysis of the Ni0.33Co0.67CO3 precursor. The Brunauer–Emmett–Teller (BET) surface area of NiCo2O4 mesoporous microspheres is determined to be about 40.58 m2 g–1 with dominant pore diameter of 14.5 nm and narrow size distribution of 10–20 nm. Our as-prepared NiCo2O4 products were evaluated as the anode material for the lithium-ion-battery (LIB) application. It is demonstrated that the special structural features of the NiCo2O4 microspheres including uniformity of the surface texture, the integrity and porosity exert significant effect on the electrochemical performances. The discharge capacity of NiCo2O4 microspheres could reach 1198 mA h g–1...

... read more

Topics: Mesoporous organosilica (59%), Mesoporous material (57%), Anode (54%)

636 Citations


Journal ArticleDOI: 10.1021/JA1009025
Kazuhiko Maeda1, Masanobu Higashi1, Daling Lu1, Ryu Abe1  +1 moreInstitutions (1)
Abstract: A two-step photocatalytic water splitting (Z-scheme) system consisting of a modified ZrO2/TaON species (H2 evolution photocatalyst), an O2 evolution photocatalyst, and a reversible donor/acceptor pair (i.e., redox mediator) was investigated. Among the O2 evolution photocatalysts and redox mediators examined, Pt-loaded WO3 (Pt/WO3) and the IO3−/I− pair were respectively found to be the most active components. Combining these two components with Pt-loaded ZrO2/TaON achieved stoichiometric water splitting into H2 and O2 under visible light, achieving an apparent quantum yield of 6.3% under irradiation by 420.5 nm monochromatic light under optimal conditions, 6 times greater than the yield achieved using a TaON analogue. To the best of our knowledge, this is the highest reported value to date for a nonsacrificial visible-light-driven water splitting system. The high activity of this system is due to the efficient reaction of electron donors (I− ions) and acceptors (IO3− ions) on the Pt/ZrO2/TaON and Pt/WO3 ph...

... read more

566 Citations


Journal ArticleDOI: 10.1021/JP3041692
Lei Ge1, Lei Ge2, Fan Zuo1, Jikai Liu1  +5 moreInstitutions (2)
Abstract: Novel CdS quantum dot (QD)-coupled graphitic carbon nitride (g-C3N4) photocatalysts were synthesized via a chemical impregnation method and characterized by X-ray diffraction, transmission electron microscopy, ultraviolet–visible diffuse reflection spectroscopy, X-ray photoelectron spectroscopy, Fourier transform infrared spectroscopy, and photoluminescence spectroscopy. The effect of CdS content on the rate of visible light photocatalytic hydrogen evolution was investigated for different CdS loadings using platinum as a cocatalyst in methanol aqueous solutions. The synergistic effect of g-C3N4 and CdS QDs leads to efficient separation of the photogenerated charge carriers and, consequently, enhances the visible light photocatalytic H2 production activity of the materials. The optimal CdS QD content is determined to be 30 wt %, and the corresponding H2 evolution rate was 17.27 μmol·h–1 under visible light irradiation, ∼9 times that of pure g-C3N4. A possible photocatalytic mechanism of the CdS/g-C3N4 comp...

... read more

Topics: Graphitic carbon nitride (55%), Spectroscopy (54%), Photocatalysis (53%) ... read more

558 Citations