Journal of Physical Chemistry C
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2019
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IF 4.309
Qinghua Deng,Yun Xu,Ziqun Wang,Tifang Miao,Xianliang Fu,Liancai Xu
The development of new catalysts based on nonprecious metals for photocatalytic H2 evolution reaction (HER) is a very challenging endeavor. In this work, we used density functional theory (DFT) to design a high performance photocatalyst based on CoIII(dmgH)2pyCl. The sample was then prepared and used for photocatalytic HER under visible light irradiation with Eosin-Y (EY2–) and triethanolamine (TEOA) as a photosensitizer and electron donor, respectively. The feasibility and rationality of the DFT design were verified by the consistency between the photocatalytic performances and the theoretical results. The developed catalyst even showed the capability of splitting of water for H2 evolution. As for the most promising CoIII(dmgH)2(pyrazine)Cl, 1356 μmol of H2 can be produced over 25 mg of catalyst after irradiation for 3 h. The deactivation and the mechanism for the evolution of H2 over the sample were further investigated. We believe that this study provides an effective strategy for the design of highly efficient photocatalysts for HER.
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APPLIED CATALYSIS B-ENVIRONMENTAL
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2019
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IF 14.229
Xinwei Jiang,Haisheng Gong,Qiuwen Liu,Mingxia Song,Caijin Huang
Mn x Cd 1-x S solid solution is an emerging semiconductor for photocatalytic water splitting with a tunable bandgap. However, it still leaves much room to improve the photocatalytic activity. Herein, we modified Mn 0.5 Cd 0.5 S with noble metal-free NiSe by an in-situ hydrothermal synthesis. The as-obtained NiSe/Mn 0.5 Cd 0.5 S nanocomposites exhibited highly efficient photocatalytic H 2 production under visible light and the highest hydrogen generation rate reaches 28.08 mmol/h/g, which is higher than that of Mn 0.5 Cd 0.5 S (13.71 mmol/h/g) and 1 wt% Pt/Mn 0.5 Cd 0.5 S (24.22 mmol/h/g). Through the detailed analyses of UV–vis DRS, photoluminescence (PL) spectra, time-resolved photoluminescence (TRPL) and photoelectrochemical tests, we found the well-matched structure between NiSe and Mn 0.5 Cd 0.5 S, which facilitates the charge transfer and prolongs the lifetime of photo-induced electrons, and thus improves photocatalytic activity.
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NANOTECHNOLOGY
·
2019
·Vol. 31
·期 6
·065603
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IF 3.399
Chun Sun,Le Wang,Sijing Su,Zhiyuan Gao,Hua Wu,Zi-hui Zhang,Wengang Bi
White light-emitting diodes (WLEDs) based on all-inorganic perovskite CsPbX3 (X = Cl, Br, I) quantum dots (QDs) have attracted much attention and rely on mixing several colors of perovskites. However, this inevitably leads to a non-uniform light distribution and serious light loss. Here, a novel strategy was demonstrated to obtain white emission by combining the orange and blue emission from CsPb/Mn(Cl/Br)3 QDs. Notably, highly efficient white emission with a photoluminescence quantum yield of 94% was achieved by an anion exchange surface engineering (AESE) strategy. After AESE treatment the surface traps can be eliminated, resulting in improved exciton and Mn2+ emission. A prototype WLED device was fabricated and exhibited excellent optical stability, demonstrating great potential for perovskite QDs in the field of optoelectronics.
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SENSORS AND ACTUATORS B-CHEMICAL
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2019
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IF 6.393
Hongtao Wang,Jihao Bai,Meng Dai,Kunpeng Liu,Yueying Liu,Linsheng Zhou,Fengmin Liu,Fangmeng Liu,Yuan Gao,Xu Yan,Lu Geyu
In this work, 2D/2D ZnO/g-C 3 N 4 heterojunction composite was synthesized through an ultrasonic mixing and subsequent calcination process. The gas-sensing performance to NO 2 was investigated at room temperature activated by visible/ultra-violet LED light sources. Noticeably, when ZnO/g-C 3 N 4 composite is illuminated by 460 nm light, it exhibits the highest response of 44.8 to 7 ppm NO 2 , and the response and recovery time is 142 and 190 s, respectively. Furthermore, it possesses excellent repeatability and selectivity to NO 2 , and the limit of detection is 38 ppb. In addition, the effect of humidity on the sensing performance under visible light was also investigated. The excellent gas-sensing performance is attributed to the absorbance of g-C 3 N 4 in the visible light region and the charge separation at the interface between ZnO and g-C 3 N 4 .
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ACS Applied Materials & Interfaces
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2019
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IF 8.456
Boshu Ouyang,Funan Liu,Shuangrong Ruan,Yao Liu,Huishu Guo,Zhengxu Cai,Xiangrong Yu,Zhiqing Pang,Shun Shen
As a novel treatment modality of tumors, hypothermal hyperthermia employed relatively lower temperature (<45 °C) to damage cancer cells with mild toxicity to normal tissues. However, beyond that inducible heat resistance of tumor cells, the discounted therapeutic effect of low temperature hyperthermia was also ascribed to poor penetration of exogenous light stimulation and low accumulation of photothermal agents in tumor sites. Herein, we constructed a multifunctional in situ hydrogel of sodium alginate (ALG) via Ca2+ coordinated with ALG to encapsulate the photothermal agent of Ink and azo initiator of 2,2′-azobis[2-(2-imidazolin-2-yl)propane]dihydrochloride (AIPH) for effective tumor treatment. The designed ALG hydrogel was used to improve the therapeutic effect by increased accumulation of Ink and AIPH and avoid potential side-effects caused by the unexpected spread to the surrounding normal tissues. After injection, local low temperature stimulation was generated with near-infrared-II irradiation by a 1064 nm laser, triggering rapid decomposition of AIPH to produce alkyl radicals. The synergistic low temperature photothermal therapy and cytotoxic-free radicals enhanced the apoptosis of tumor cells via physical heat damage and lipid peroxidation. Thus, remarkable inhibition of tumor growth was observed in a subcutaneous colorectal cancer with negligible side effects. Furthermore, the formulation could also exert strong photoacoustic signals, which were utilized to monitor the stability of the composite hydrogel.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2019
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IF 4.084
Qianqian Ba,Xinjia Jia,Li Huang,Xiying Li,Li Gao,Liqun Mao
PtNi x hollow nanoparticles (HNPs) as a cocatalyst was synthesized by a galvanic replacement method at room temperature , and then was loaded on CdS. The hollow structure of PtNi x alloy was confirmed by TEM and STEM . Photocatalytic hydrogen production reaction was performed for PtNi x /CdS catalyst under 300 W Xe lamp (λ ≥ 420 nm). It is noteworthy that PtNi 0.5 /CdS shows the highest hydrogen evolution activity of 2.9 mmol/h with QE = 51.24% at 420 nm, which is higher than that of situ-photodeposited Pt onto CdS (0.57 mmol/h). The enhancement of hydrogen evolution performance of PtNi 0.5 /CdS could be attributed to the porous shell and hollow structure of PtNi 0.5 NPs, as well as the strong electronic coupling effect between Pt and Ni. Besides, the sheet structure of CdS in some degree promoted the hydrogen production rate. Therefore, the PtNi x HNPs could be a promising cocatalyst of CdS for solar driven hydrogen evolution.
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DYES AND PIGMENTS
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2019
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IF 4.018
Kun Xu,Lei Zhang
The interactions between molecules and halide perovskite surfaces are important for halide perovskite-based optoelectronic and energy conversion systems. In this manuscript, we investigate the interactions between N3 dye, a famous dye widely employed for dye-sensitized solar cells, and halide perovskite CH 3 NH 3 PbI 3 surface, employing combined experimental and first principles techniques. We find that the interactions between the N3 dye and CH 3 NH 3 PbI 3 are synergistic for the photocurrent generation from the resulting molecule/perovskite photoanode in aqueous solution. The photocurrent values significantly increase by orders of magnitude for the hybrid N3/CH 3 NH 3 PbI 3 system compared with those of the individual components under visible light. The first principles calculations reveal the detailed structural, electronic and optical properties of the N3/CH 3 NH 3 PbI 3 hybrid systems. This study facilitates the fundamental understanding of the interactions between dye molecules and halide perovskite materials, and benefits the design of surface engineered halide perovskite materials for optoelectronic and energy conversion applications.
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JOURNAL OF MOLECULAR STRUCTURE
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2022
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IF 3.841
Tian Sang,Yan Zhong,Dian-Hui Wang,Chao-Hao Hu,Jun-Chen Ye,Wen-Yi Wang,Hao Liu
To expand the range of application of insulating calcium carbonate (CaCO 3 ), we combined CaCO 3 with narrow bandgap cadmium sulfide (CdS) with the chemical precipitation method and characterized the composite through X-ray powder diffraction, X-ray photoelectron spectroscopy, scanning electron microscopy, and transmission electron microscopy. The photocatalytic activities of composite catalysts with different molar ratios on Cr 6+ are further investigated and compared. The materials showed good photocatalytic reduction effect on Cr 6+ under visible light. At the same time, the catalysts have good catalytic performance and service life, far exceeding pure CdS. The behavior of photogenerated carriers and free radicals in photocatalytic reduction processes were explored with a trapping agent experiment, and the mechanism that enhances catalytic activity in the CaCO 3 composite catalyst was revealed. Overall, results show that CaCO 3 has great potential as a photocatalyst.
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Electronic Materials Letters
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2022
·Vol. 19
·期 1
·94-107
·
IF 3.151
Luo Menghao,Feng Hange,Hu Yuechuan,Chen Keke,Dong Zibo,Xue Shaolin
Abstract Photocatalytic degradation has received considerable emphasis since it shows significant possibilities in environmental pollution. In this work, ternary Z-scheme heterojunction g-C 3 N 4 /TiO 2 /Ti 3 C 2 photocatalysts are designed and fabricated. The Z-scheme heterojunctions formed on the surfaces of g-C 3 N 4 and TiO 2 dramatically modify the photocatalytic performances of the compound under illumination. Meanwhile, in this process, multilayer Ti 3 C 2 , as the transport medium of Z-scheme heterojunction, is tightly bonded to TiO 2 generated by hydrothermal oxidation and g-C 3 N 4 with large specific surface area, which effectively facilitates the space charge separation and depresses the charge recombination. When the addition amount of TiO 2 /Ti 3 C 2 is 80 mg and calcined at 450 ℃ for 4 h, g-C 3 N 4 /TiO 2 /Ti 3 C 2 has the greatest photocatalytic performance, and the kinetic constant for degradation methyl orange (MO) was about 3.62 times that of g-C 3 N 4 and 14.55 times that of Ti 3 C 2 , respectively. This work illustrates that g-C 3 N 4 /TiO 2 /Ti 3 C 2 has outstanding potential and offers novel insights for designing and synthesizing new ternary heterojunction materials. Graphical Abstract
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APPLIED SURFACE SCIENCE
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2022
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IF 7.392
Jingxuan Pei,Zhenfei Tian,Xiang Yu,Shuting Zhang,Shiqing Ma,Yibo Sun,Rabah Boukherroub
Antibiotic residues in wastewater cause a serious threat to aquatic environment and human safety. Therefore, the development of robust strategies for detecting antibiotic residues becomes critical. In this work, a surface-enhanced Raman scattering (SERS) substrate, consisting of gold nanoparticles/nano diamond/carbon nitride (Au/ND/C 3 N 4 ) hybrid, which features enhanced light utilization and self-cleaning properties, is developed for sensitive sensing of tetracycline. The fabricated Au/ND/C 3 N 4 substrate effectively captures target molecules and enhances Raman activity, owing to abundant functional groups and light scattering effect of ND. Moreover, the heterostructure formed by Au NPs, ND and C 3 N 4 endows this SERS substrate with superior self-cleaning capability, enabling its reusability. The Au/ND/C 3 N 4 substrate exhibits high sensitivity (10 -14 M), desirable reproducibility (RSD = 13.29 %, n = 238) and favourable stability (84.8 % of initial intensity after 30 days) for crystal violet probe. Also, no significant loss of SERS or catalytic activity is observed during cyclic SERS detection. Likewise, the detection of tetracycline at nanomolar level is achieved with good recyclability. This work proposes a distinctive strategy for enhancing SERS activity, and the developed self-cleaning Au/ND/C 3 N 4 substrate represents a potential candidate for highly sensitive detection of antibiotic residues in wastewater.
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ECS Journal of Solid State Science and Technology
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2022
·Vol. 11
·期 10
·107001
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IF 2.483
Jiaqi Luo,Weijiu Huang,Bitao Liu,Bing Liu
Zirconia slurry aimed to apply in digital light process (DLP) printing technology were made of the 3 mol% yttrium oxide (Y2O3) stabilized micro-nano zirconium dioxide (3YSZ) powders. An overall mechanical strength can be obtained via a precise control of two-step sintering process. The results show that Y2O3 in 3YSZ would diffuses into the ceramic lattice, further stabilizing the metastable tetragonal zirconia (t-ZrO2) toughening phase in sub-micro sized grains with nearly 100% crystal phase transition ratio. The Vickers hardness of sintered ceramic parts reaches 12.94 ± 0.186 GPa. The fracture toughness (KIC) of sintered ceramics is 5.63 ± 0.015 MPa·m1/2. The propagation law of Vickers crack reveals the mechanism of strengthening and toughening of fine grains on matrix fracture toughness. Due to the uniform crystals also can make the corrosion better to construct a three-phase boundary sensitive process, the response of the T-ZrO2-SnO2 to 30 ppm NH3 is 15.7 mV which is 2 times more than the commercial ZrO2. A relative short response and recovery times of 6 s and 33 s can achieve with a good reproducibility of continuous response and recovery transients.
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CHEMOSPHERE
·
2022
·
IF 8.943
Jinhua Luo,Yaohui Wu,Mengzhu Jiang,Aihua Zhang,Xiaoyong Chen,Yelin Zeng,Yonghong Wang,Yunlin Zhao,Guangjun Wang
Developing broad-spectrum light reactions, effective charge separation, and easily recoverable photocatalysts were considered cost-effective pollution remediation methods. The ZnFe 2 O 4 /BC/ZnO composite was prepared to achieve these objectives, where biochar (BC) was used as a conductive channel and ZnFe 2 O 4 as a magnetic substance. Among them, the 0.6-ZBO composite performed the best, with photocatalytic removal of tetracycline (TC) reaching 85.6%. The photocatalytic degradation rated constant of 0.6-ZBO composite was 23.36 × 10 −3 min −1 , which was 7.6, 4.1, and 2.5 times higher than that of ZnFe 2 O 4 /BC, ZnO, and ZnFe 2 O 4 /ZnO samples, respectively. According to several characterization data, it was demonstrated that successful Z-scheme heterojunctions were constructed between ZnFe 2 O 4 and ZnO. The 0.6-ZBO complex increased the range of light absorption and strengthened the separation of electron-hole pairs, thus improving the redox ability of the complex. In the different water matrices, the stability of 0.6-ZBO was excellent and its ability to remove TC decreased slightly to about 11% after 5 cycles. This work provided a valuable approach to design a novel and efficient system for degrading organic pollutants in wastewater using magnetic biochar.
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