High performance H2O2 production achieved by sulfur-doped carbon on CdS photocatalyst via inhibiting reverse H2O2 decomposition

Lee, Jae Hwa; Cho, Hyeonjin; Park, Sung O; Hwang, Jeong Min; Hong, Yerin; Sharma, Pankaj; Jeon, Woo Cheol; Cho, Yongjoon; Yang, Changduk; Kwak, Sang Kyu; Moon, Hoi Ri; Jang, Ji‐Wook

doi:10.1016/j.apcatb.2020.119690

Cited by 83 publications

(27 citation statements)

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“…Moreover, it also reduces our energy reliance on unsustainable fossil fuels and alleviates environmental pollution 15,19,20 . To date, various semiconductors have been developed for photocatalytic H2O2 production, including TiO2 13,16,21 , ZnO [22][23][24] , g-C3N4 [25][26][27] , CdS 28,29 , graphene 30,31 and BiVO4 32 . Among them, ZnO, featured with non-toxicity, stability and earth-abundance, has attracted much interest 33 , but it still suffers from poor absorption of sunlight and fast recombination of photoinduced charge carriers 34 .…”

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confidence: 99%

Enhanced Photocatalytic H2O2 Production over Inverse Opal ZnO@ Polydopamine S-scheme Heterojunctions

Han¹,

Xu²,

Cheng³

et al. 2022

Acta Physico Chimica Sinica

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Photocatalytic H2O2 production is a sustainable and inexpensive process that requires water and gaseous O2 as raw materials and sunlight as the energy source. However, the slow kinetics of current photocatalysts limits its practical application. ZnO is commonly used as a photocatalytic material in the solar-to-chemical conversion, owing to its high electron mobility, nontoxicity, and relatively low cost. The adsorption capacity of H2O2 on the ZnO surface is low, which leads to the continuous production of H2O2. However, its photoresponse is limited to the ultraviolet (UV) region due to its wide bandgap (3.2 eV). Polydopamine (PDA) has emerged as an effective surface functionalization material in the field of photocatalysis due to its abundant functional groups. PDA can be strongly anchored onto the surface of a semiconducting photocatalyst through covalent and noncovalent bonds. The superior properties of PDA served as a motivation for this study. Herein, we prepare an inverse opal-structured porous PDA-modified ZnO (ZnO@PDA) photocatalyst by in situ self-polymerization of dopamine hydrochloride. The crystal structure, morphology, valency, stability, and energy band structure of photocatalysts are characterized by X-ray diffraction (XRD), Fourier-transform infrared spectroscopy (FTIR), transmission electron microscopy (TEM), field-emission scanning electron microscopy (FE-SEM), X-ray photoelectron spectroscopy (XPS), UV-visible diffuse reflectance spectroscopy (UV-Vis DRS), electrochemical impedance spectroscopy (EIS), Mott-Schottky curve (MS), and electron paramagnetic resonance (EPR). The experimental results showed that electrons in PDA are transferred to ZnO upon contact, which results in an electric field at their interface in the direction from PDA to ZnO. The photoexcited electrons in the ZnO conduction bands flow into PDA, driven by the electric field and bent bands, and are recombined with the holes of the highest occupied molecular orbital of PDA, thereby exhibiting an S-scheme charge transfer. This unique S-scheme mechanism ensures effective electron/hole separation and preserves the strong redox ability of used photocarriers. In addition, the inverse opal structure of ZnO@PDA promotes light-harvesting due to the supposed "slow photon" effect, as well as Bragg diffraction and scattering. Moreover, the enhanced surface area provides a high adsorption capacity and increased active sites for photocatalytic reactions. Therefore, the resulting ZnO@PDA (0.03% (atomic fraction) PDA) exhibits the optimal H2O2 production performance (1011.4 μmol•L −1 •h −1 ), which is 4.4 and 8.9 times higher than pristine ZnO and PDA, respectively. The enhanced performance is ascribed to the improved light absorption, efficient charge separation, and strong redox capability of photocarriers in the S-scheme heterojunction. Therefore, this study provides a novel strategy for the design of inorganic/organic S-scheme heterojunctions for efficient photocatalytic H2O2 production.

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confidence: 99%

Enhanced Photocatalytic H2O2 Production over Inverse Opal ZnO@ Polydopamine S-scheme Heterojunctions

Han¹,

Xu²,

Cheng³

et al. 2022

Acta Physico Chimica Sinica

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“…2(d), the two peaks at 160.8 eV and 161.9 eV are assigned to S 2p 3/2 and S 2p 1/2 , respectively. 19 There was little difference in the peak positions of CdS-0 and CdS-1, indicating that the Cd and S chemical states are the same in the two samples.…”

Section: Resultsmentioning

confidence: 91%

“…15–17 Since the photocatalytic reaction is carried out at room temperature and does not require the use of hydrogen, it is relatively of low-cost and safe. 18,19…”

Section: Introductionmentioning

confidence: 99%

Highly efficient photosynthesis of H₂O₂via two-channel pathway photocatalytic water splitting

Sun

Song

et al. 2022

Inorg. Chem. Front.

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“…, ≥10%). 54–56 Such low decomposition rates of both Au-Co-TCPP and Au NCs for H 2 O 2 are probably due to the adequate capping of the Au core by relatively bulky GSH ligands that largely reduce the encounter chance of the Au core of NCs with H 2 O 2 molecules. Furthermore, the morphology of Au-Co-TCPP after 1 h photocatalytic reaction was characterized by TEM (Fig.…”

Section: Resultsmentioning

confidence: 99%

Ligand engineering of Au nanoclusters with multifunctional metalloporphyrins for photocatalytic H₂O₂production

et al. 2022

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High performance H2O2 production achieved by sulfur-doped carbon on CdS photocatalyst via inhibiting reverse H2O2 decomposition

Cited by 83 publications

References 50 publications

Enhanced Photocatalytic H<sub>2</sub>O<sub>2</sub> Production over Inverse Opal ZnO@ Polydopamine S-scheme Heterojunctions

Enhanced Photocatalytic H<sub>2</sub>O<sub>2</sub> Production over Inverse Opal ZnO@ Polydopamine S-scheme Heterojunctions

Highly efficient photosynthesis of H₂O₂via two-channel pathway photocatalytic water splitting

Ligand engineering of Au nanoclusters with multifunctional metalloporphyrins for photocatalytic H₂O₂production

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High performance H2O2 production achieved by sulfur-doped carbon on CdS photocatalyst via inhibiting reverse H2O2 decomposition

Cited by 83 publications

References 50 publications

Enhanced Photocatalytic H<sub>2</sub>O<sub>2</sub> Production over Inverse Opal ZnO@ Polydopamine S-scheme Heterojunctions

Enhanced Photocatalytic H<sub>2</sub>O<sub>2</sub> Production over Inverse Opal ZnO@ Polydopamine S-scheme Heterojunctions

Highly efficient photosynthesis of H2O2via two-channel pathway photocatalytic water splitting

Ligand engineering of Au nanoclusters with multifunctional metalloporphyrins for photocatalytic H2O2production

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Product

Resources

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Highly efficient photosynthesis of H₂O₂via two-channel pathway photocatalytic water splitting

Ligand engineering of Au nanoclusters with multifunctional metalloporphyrins for photocatalytic H₂O₂production