Synthesis of Se-doped ZnO nanoplates with enhanced photoelectrochemical and photocatalytic properties

Chen, Yuanlu; Wang, Lijuan; Wang, Wenzhong; Cao, Mao‐Sheng

doi:10.1016/j.matchemphys.2017.07.036

Cited by 63 publications

(14 citation statements)

References 53 publications

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“…As shown in Figure 3d, the peak of Se 3d(0) orbital appears at 54.9 eV, indicating that the metallic Se element was alloyed into the Te matrix. Additional peaks of higher binding energies in the Se 3d region correspond to the formation of SeO x , 48 demonstrating that oxidation of selenium takes place after exposure to oxidized environment for a long time.…”

Section: Resultsmentioning

confidence: 99%

Low Thermal Conductivity and Optimized Thermoelectric Properties of p-Type Te–Sb₂Se₃: Synergistic Effect of Doping and Defect Engineering

Chen

et al. 2019

ACS Appl. Mater. Interfaces

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Elemental tellurium exhibits a promising thermoelectric performance, largely due to the optimization of the carrier concentration stemming from effective chemical doping. In this study, we demonstrate a novel approach to realize the collaborative manipulation of the electrical and thermal transport properties in the Te system via introduction of Sb 2 Se 3 . A series of p-type Te 1−x (Sb 2 Se 3 ) x (0 ≤ x ≤ 0.2) samples were fabricated through the melting method followed by spark plasma sintering. Electrically, antimony as a successful dopant enables a remarkable improvement of the carrier concentration, from ∼10 18 to ∼10 19 cm −3 , thus resulting in a desired power factor across the entire temperature range. Thermally, utilization of defects engineering containing point defects, grain boundaries, dislocations, and secondary phase precipitates effectively reduces the lattice thermal conductivity. The coexistence of multi-frequency phonon scattering centers derived from the addition of Sb 2 Se 3 leads to a minimum lattice thermal conductivity of 0.5 W m −1 K −1 , approaching the amorphous limit. As a result, Te 0.95 (Sb 2 Se 3 ) 0.05 shows the highest figure of merit ZT ∼1 at 600 K, comparable to that of the toxic Te(As) thermoelectrics. This work not only points out that synergistic effects of both doping and defect engineering play a vital role in decoupling the thermoelectric parameters in the Te 1−x (Sb 2 Se 3 ) x system but also gives a referential strategy for a higher thermoelectric performance in other Te-based materials.

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Section: Resultsmentioning

confidence: 99%

Low Thermal Conductivity and Optimized Thermoelectric Properties of p-Type Te–Sb₂Se₃: Synergistic Effect of Doping and Defect Engineering

Chen

et al. 2019

ACS Appl. Mater. Interfaces

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“…Owing to the excellent physical and chemical properties, such as high electrochemical stability, super oxidative capacity and low toxicity, ZnO is a promising material for the application of photocatalytic activity. Therefore, among the other metal oxides, ZnO is the first and widely used material in heterogeneous photocatalysis [7–10]. Although it has numerous advantages in the photocatalytic process, the fast recombination of photo-excited charge carriers in ZnO hinders the photocurrent generation and photocatalytic efficiency.…”

Section: Introductionmentioning

confidence: 99%

Ag-doped ZnO nanorods embedded reduced graphene oxide nanocomposite for photo-electrochemical applications

et al. 2019

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In this paper, the Ag-doped zinc oxide nanorods embedded reduced graphene oxide (ZnO:Ag/rGO) nanocomposite was synthesized for photocatalytic degradation of methyl orange (MO) in the water. The microstructural results confirmed the successful decoration of Ag-doped ZnO nanorods on rGO matrix. The photocatalytic properties, including photocatalytic degradation, charge transfer kinetics and photocurrent generation, are systematically investigated using electrochemical impedance spectroscopy (EIS), photocurrent transient response (PCTR) and open circuit voltage decay (OCVD). The results of photocatalytic dye degradation measurements indicated that ZnO:Ag/rGO nanocomposite is more effective than pristine ZnO to degrade the MO dye, and the degradation rate reached 40.6% in 30 min. The decomposition of MO with ZnO:Ag/rGO nanostructure followed first-order reaction kinetics with a reaction rate constant ( K a ) of 0.01746 min −1 . The EIS, PCTR and OCVD measurements revealed that the Ag doping and incorporation of rGO could suppress the recombination probability in ZnO by the separation of photo-generated electron–hole pairs, which leads to the enhanced photocurrent generation and photocatalytic activity. The photocurrent density of ZnO:Ag/rGO, ZnO/rGO and pristine ZnO are 206, 121.4 and 88.8 nA cm −2 , respectively.

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“…In this paper, ZnSe microspheres were synthesized by the hydrothermal method using Zn(NO 3 ) 2 ·6H 2 O and Na 2 SeO 3 as the precursor and N 2 H 4 ·H 2 O as reducing agent. 19 The effects of different doping amounts (Ag, Mn) on the phase composition, morphology, optical and electrical properties of the final product were investigated. When 10 mL of N 2 H 4 ·H 2 O was added, the hydrothermal reaction was carried out at 180 °C for 4 h, the final products were mainly ZnSe microspheres of the cubic sphalerite structure; several rodlike structures occurred in the Ag-doped ZnSe sample, while Mn-doped ZnSe retained the microsphere structure.…”

Section: Introductionmentioning

confidence: 99%

“…In this paper, ZnSe microspheres were synthesized by the hydrothermal method using Zn(NO 3 ) 2 ·6H 2 O and Na 2 SeO 3 as the precursor and N 2 H 4 ·H 2 O as reducing agent . The effects of different doping amounts (Ag, Mn) on the phase composition, morphology, optical and electrical properties of the final product were investigated.…”

Section: Introductionmentioning

confidence: 99%

Tunability in the Optical and Electronic Properties of ZnSe Microspheres via Ag and Mn Doping

et al. 2019

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ZnSe microspheres with various Ag and Mn doping levels were prepared by the hydrothermal method using Zn(NO 3 ) 2 ·6H 2 O and Na 2 SeO 3 as precursors and N 2 H 4 ·H 2 O as the reducing agent. The effects of Ag and Mn doping on the phase composition, morphology, and optical and electrical properties of the final products were systematically investigated. A remarkable change in morphology from microspheres with a cubic sphalerite structure to rodlike structure was observed by Ag doping, while the pristine structure was nearly unchanged via Mn doping. Moreover, the band gap of ZnSe microspheres could be tunable in a broad range via controlling the Ag and Mn doping concentration, and ZnSe with high electrical properties could be obtained by doping with an appropriate concentration. The first-principle plane-wave method was carried out to explain the above mentioned experimental results.

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Synthesis of Se-doped ZnO nanoplates with enhanced photoelectrochemical and photocatalytic properties

Cited by 63 publications

References 53 publications

Low Thermal Conductivity and Optimized Thermoelectric Properties of p-Type Te–Sb₂Se₃: Synergistic Effect of Doping and Defect Engineering

Low Thermal Conductivity and Optimized Thermoelectric Properties of p-Type Te–Sb₂Se₃: Synergistic Effect of Doping and Defect Engineering

Ag-doped ZnO nanorods embedded reduced graphene oxide nanocomposite for photo-electrochemical applications

Tunability in the Optical and Electronic Properties of ZnSe Microspheres via Ag and Mn Doping

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Synthesis of Se-doped ZnO nanoplates with enhanced photoelectrochemical and photocatalytic properties

Cited by 63 publications

References 53 publications

Low Thermal Conductivity and Optimized Thermoelectric Properties of p-Type Te–Sb2Se3: Synergistic Effect of Doping and Defect Engineering

Low Thermal Conductivity and Optimized Thermoelectric Properties of p-Type Te–Sb2Se3: Synergistic Effect of Doping and Defect Engineering

Ag-doped ZnO nanorods embedded reduced graphene oxide nanocomposite for photo-electrochemical applications

Tunability in the Optical and Electronic Properties of ZnSe Microspheres via Ag and Mn Doping

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Low Thermal Conductivity and Optimized Thermoelectric Properties of p-Type Te–Sb₂Se₃: Synergistic Effect of Doping and Defect Engineering

Low Thermal Conductivity and Optimized Thermoelectric Properties of p-Type Te–Sb₂Se₃: Synergistic Effect of Doping and Defect Engineering