ACS Applied Energy Materials
·
2022
·
IF 6.959
Jing Dong,Wenjian Fang,Hui Yuan,Weiwei Xia,Xianghua Zeng,Wenfeng Shangguan
Studies on highly efficient noble-metal-free catalysts are regarded as an important task for H2 production by water-splitting. MoS2/ZnCdS/ZnS dual heterostructures were successfully prepared with respective supernatant MoS2 colloidal solutions (called M/ZC/Z) and MoS2 precipitates (M(p)/ZC/Z). Scanning electron microscopy (SEM) and transmission electron microscopy (TEM) images of the M/ZC/Z sample showed that ZnS nanosheets were decorated with ZnCdS nanorods and few-layered MoS2. Then, photocatalytic hydrogen production study was performed and the results showed that the M/ZC/Z sample has a H2 evolution rate of up to 79.3 mmol g–1 h–1 under visible light irradiation with an apparent quantum efficiency of 47.9% at 420 nm with noble-metal-free catalysts, which is nearly 5 times that of the M(p)/ZC/Z sample (15.7 mmol g–1 h–1) and approximately 9 times that of the ZC/Z sample (8.98 mmol g–1 h–1). Cycle tests showed that M/ZC/Z is stable and reusable. Without sacrificial agents, the production rates for hydrogen and oxygen evolution were obtained as 3.15 and 1.55 mmol g–1 h–1, respectively. Time-resolved photoluminescence spectra revealed that the well-matched structure is effective in the separation and transfer of photogenerated electron and hole pairs, leading to the enhancement of the photocatalytic H2 production activity.
研究领域:
材料科学
·
能源科学
✓ 已验证
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2019
·
IF 4.084
Lei-Lei Li,Xing-Liang Yin,Dong-Hui Pang,Xin-Xin Du,Han Xue,Hua-Wei Zhou,Qing-Xia Yao,Huai-Wei Wang,Jun-Chao Qian,Jie Yang,Da-Cheng Li,Jian-Min Dou
Exploration of cost-efficient and high-performance photocatalyst for H 2 evolution by using a facile approach is of great importance. In this manuscript, a facile one-pot method was employed to fabricate MoS 2 /CdS heterostructures with MoS 2 intimately grown on the surface of CdS resulting in the formation of well-defined heterostructures. Screen experiment reveals the optimized photocatalytic H 2 evolution performance of MoS 2 /CdS is far exceeding that of pristine CdS by a factor of more than 162. The outstanding performance can be ascribed to the formation of heterostructures which accelerate charge transportation and separation, and the MoS 2 serving as a cocatalyst for the decrease of H 2 overpotential. Moreover, the photocatalytic mechanism of the MoS 2 /CdS was carefully investigated, which contributes to the deep understanding of the photocatalytic process and the designation of other low-cost and high-efficient photocatalyst.
研究领域:
材料科学
·
能源化学
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2018
·Vol. 8
·期 50
·28684-28691
·
IF 2.936
Ka Wang,Weilan Guo,Shancheng Yan,Haizeng Song,Yi Shi
The traditional method of preparing hydrogen and oxygen as efficient clean energy sources mainly relies on the use of platinum, palladium, and other precious metals. However, the high cost and low abundance limit wide application of such metals. As such, one challenging issue is the development of low-cost and high-efficiency electrocatalysts for such purposes. In this study, we synthesized Co–FeS2/CoS2 heterostructures via a hydrothermal method for efficient hydrogen evolution reaction (HER) and oxygen evolution reaction (OER). Benefitting from their unique three-dimensional hierarchical nanostructures, Co-doped FeS2, and CoS2 formed heterostructures on Co–FeS2 petals, which bestowed remarkable electrocatalytic properties upon Co–FeS2/CoS2 nanostructures. Co–FeS2/CoS2 effectively catalyzed the OER with an overpotential of 278 mV at a current density of 10 mA cm−2 in 1 M KOH solution, and also is capable of driving a current density −10 mA cm−2 at an overpotential of −103 mV in 0.5 M H2SO4 solution. The overpotential of the OER and HER only decreased by 5 mV and 3 mV after 1000 cycles. Our Co–FeS2/CoS2 materials may offer a promising alternative to noble metal-based electrocatalysts for water splitting.
研究领域:
材料科学
·
能源化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Materials
·
2021
·Vol. 14
·期 21
·6474
·
IF 3.623
Huan Shuai,Jiao Wang,Xianguang Wang,Gaoxiang Du
Herein, using black talc as a carrier, a ternary black talc-TiO2/ZnO composite photocatalyst was prepared by the sol-gel method, and the effect of the black talc on the hetero-structure properties of the TiO2and ZnO was systematically studied. The prepared composite photocatalyst showed an excellent degradation performance of the pollutant, where black talc plays an important role in promoting the interface interaction by enhancing the contact area between the TiO2and ZnO. Moreover, the free carbon element doping in black talc favors the formation of more oxygen vacancies, thereby improving the response as a photocatalyst in visible light. In addition, the carbon in the black talc can also adsorb organic pollutants and enrich the surroundings of the photocatalyst with pollutants, so it further improves the catalytic efficiency of the photocatalyst. Under UV irradiation, the degradation rate of Rhodamine B on black talc-TiO2/ZnO was found 3.3 times higher than that of black talc-TiO2with good stability.Keywords:black talc carrier;heterostructure;photocatalyst;TiO2;ZnO
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Catalysts
·
2023
·Vol. 13
·期 2
·238
·
IF 3.9
Qing Jin,Youlin Xiang,Lu Gan
Indoor formaldehyde pollution causes a serious threat to human health since it is uninterruptedly released from wooden furniture. Herein, we prepared a g-C3N4-modified TiO2composite photocatalyst and coated it on the surface of a commercial artificial particle board with the assistance of melamine formaldehyde adhesive. The g-C3N4/ TiO2coating was then used to degrade formaldehyde which was released in real-time from the particle board under the irradiation of visible light. The results showed that compared with pure TiO2, the g-C3N4/ TiO2composite with a heterojunction structure had a lower band gap energy (~2.6 eV), which could effectively capture luminous energy from the visible light region. Under continuous irradiation, the g-C3N4/ TiO2photocatalytic coating was capable of degrading more than 50% of formaldehyde constantly released from the particle board. In the meantime, the photocatalytic coating also exhibited promising catalytic stability towards various formaldehyde release speeds, air flow velocities and environmental humidities. The hydroxyl radical and superoxide radical were found to be the predominant active species which triggered formaldehyde degradation. This study provides a feasible and practical approach for the improvement in indoor air quality through photocatalyst surface engineering.Keywords:photocatalyst;TiO2;g-C3N4;heterostructure;formaldehyde degradation
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Energy Storage
·
2023
·
IF 9.4
Xiaolin Sun,Kai Zhao,Hucheng Fu,Hanwen Guo,Jun Shen,Fuhao Jin,Lei Wang,Zihao Wang,Liang Cui,Fengyu Quan,Jingquan Liu
For high-performance electrochemical energy storage and conversion applications, controllable nanoarchitecture arrays of the transition metal selenide on conductive substrates are attractive electrode materials. In this work, a heterostructure comprising of MnSe 2 nanorods over NiCo 2 Se 4 nanosheets with a large specific surface area is rationally generated on nickel foam (NF) substrate (MnSe 2 @NiCo 2 Se 4 ) using a hydrothermal process. The formation mechanism of the MnSe 2 @NiCo 2 Se 4 heterostructure was also examined by adjusting the selenium feeding during the selenization process. The MnSe 2 @NiCo 2 Se 4 -2 electrode exhibits remarkable capacitance (1078C g −1 at 1 A g −1 ), and superior cycle stability (90.7 % after 8000 cycles) as a result of the cooperative effect of MnSe 2 and NiCo 2 Se 4 . Furthermore, an asymmetric supercapacitor (ASC) was developed employing the improved MnSe 2 @NiCo 2 Se 4 -2 and activated carbon materials (AC) as the positive electrode and negative electrode (MnSe 2 @NiCo 2 Se 4 -2//AC), respectively, which has a high energy density of 63.2 Wh kg −1 at a power density of 396 W kg −1 . The impressive performance indicates that the MnSe 2 @NiCo 2 Se 4 electrode has a bright potential in supercapacitors .
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
Small
·
2023
·
IF 13.3
Yuxin Long,Qiang Li,Zidong Zhang,Qingxi Zeng,Dong Liu,Lanling Zhao,Yao Liu,Yebing Li,Yiming Zhang,Kunqian Ji,Zhaorui Zhou,Xue Han,Jun Wang
Li-O 2 batteries could deliver ultra-high theoretical energy density compared to current Li-ion batteries counterpart. The slow cathode reaction kinetics in Li-O 2 batteries, however, limits their electrocatalytic performance. To this end, MoSe 2 and Ni 0.85 Se nanoflakes were decorated in carbon hollow nanoflowers, which were served as the cathode catalysts for Li-O 2 batteries. The hexagonal Ni 0.85 Se and MoSe 2 show good structural compatibility with the same space group, resulting in a stable heterogeneous structure. The synergistic interaction of the unsaturated atoms and the built-in electric fields on the heterogeneous structure exposes abundant catalytically active sites, accelerating ion and charge transport and imparting superior electrochemical activity, including high specific capacities and stable cycling performance. More importantly, the lattice distances of the Ni 0.85 Se (101) plane and MoSe 2 (100) plane at the heterogeneous interfaces are highly matched to that of Li 2 O 2 (100) plane, facilitating epitaxial growth of Li 2 O 2 , as well as the formation and decomposition of discharge products during the cycles. This strategy of employing nonstoichiometric compounds to build heterojunctions and improve Li-O 2 battery performance is expected to be applied to other energy storage or conversion systems.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CATALYSIS COMMUNICATIONS
·
2019
·
IF 3.674
Li-Li Chu
2D-3D noble-metal-free Ni 2 P/Zn 3 In 2 S 6 hierarchical composites were fabricated firstly by the hydrothermal method and characterized by the relative techniques. The average H 2 evolution rate over the optimized Ni 2 P/Zn 3 In 2 S 6 under simulated sunlight can reach up to 6.4 mmol g −1 h −1 , which is about 3.4 and 2.6 times higher than that of pure Zn 3 In 2 S 6 and Pt/Zn 3 In 2 S 6 hybrid. The excellent photocatalytic performance can be attributed to the interaction between the well-dispersed ultrafine Ni 2 P cocatalyst and the 2D-3D Zn 3 In 2 S 6 hierarchical structure, which contributes to the separation and transportation of the photoinduced charge carriers.
研究领域:
材料科学
·
能源科学
✓ 已验证
DOI
高影响因子
Nanomaterials
·
2019
·Vol. 9
·期 2
·292
·
IF 4.034
Zhi Zhang,Xuliang Lv,Yiwang Chen,Pin Zhang,Mingxu Sui,Hui Liu,Xiaodong Sun
For the purposes of strength, military equipment camouflage, and protecting the health of organisms, electromagnetic wave absorbing materials have received a lot of attention and are widely studied. In addition to having a strong absorption intensity and a wide effective absorption bandwidth, materials that are lightweight, thermally stable, and antioxidative are also highly desirable. In this study, we fabricated core–shell structured NiS2@MoS2nanospheres anchored on reduced graphene oxide (rGO) nanosheets (NiS2@MoS2/rGO) by a simple two-step hydrothermal method. The combination ratio was adjusted to achieve proper impedance matching. The electromagnetic parameters and the absorption performance were investigated in detail. A composite loaded with 30 wt.% of the sample achieved a minimum reflection loss (RL) value of −29.75 dB and the effective bandwidth (RL value of less than −10 dB) ranged from 4.95 GHz to 18.00 GHz (13.05 GHz), with a thickness ranging from 1.5 mm to 4.0 mm. This study proved that the generated significant interfacial polarization and synergetic interaction between components can result in NiS2@MoS2/rGO composites with enhanced electromagnetic absorption performance.Keywords:graphene;core–shell;heterostructure;electromagnetic absorption
研究领域:
材料科学
·
电磁学
✓ 已验证
DOI
PubMed
高影响因子
APPLIED CATALYSIS A-GENERAL
·
2016
·
IF 4.012
Yangyang Zhang,Yiping Guo,Bijun Fang,Yujie Chen,Huanan Duan,Hua Li,Hezhou Liu
BiO 2 CH 3 nanoplate, a new organometallic crystal, with octagonal morphology is successfully prepared using methanol solvothermal method and further employed as template to fabricate porous β-Bi 2 O 3 octagonal nanoplates with a thickness of less than 50 nm. Then a series of hierarchical octagonal haystack-like β-Bi 2 O 3 /Bi 2 S 3 hybrids with large heterointerface and small bandgaps (1.36–1.44 eV) are constructed. It is found that, different from many regular photocatalysts that suffer from shrink of photocatalytic efficiency, the photoactivities of all β-Bi 2 O 3 /Bi 2 S 3 heterostructures are continuously enhanced with growing test cycles, owing to the formation of Bi 2 O 3− x S x solid solution, in which the built-in electric filed induced by lattice distortion can brings about higher e − /h + separation efficiency. The gradually increasing photocatalytic activity can reach to an up limit in about 5 photocatalytic cycles and maintain at this level. β-Bi 2 O 3 /Bi 2 S 3 heterostructure loaded with 20 mol% of Bi 2 S 3 is demonstrated to be the best photocatalyst and capable of fully decomposing Rh B in 30 min. Our work provides deep insights into the nature of the inversed photocatalytic behavior and facilitates the advanced design of photocatalysts with unabated photoactivities.
研究领域:
材料科学
·
光催化
✓ 已验证
DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2022
·
IF 14.224
Fengyi Zhong,Chaowei Yuan,Ye He,Yanjuan Sun,Jianping Sheng,Fan Dong
Constructing heterostructure is an effective way to fabricate advanced photocatalysts. However, the catalytic performance of typical common multi-dimensional bulk heterostructure still suffers from the limited active interface and inefficient carrier migration. Herein, we successfully synthesize the SnO 2 /Cs 3 Bi 2 I 9 dual-quantum-dots nanoheterostructure (labeled as SCX, X = 1, 2, 3) for efficiently and stably photocatalytic NO removal under visible light irradiation. The NO removal rate of SC2 is almost 8 and 17 times higher than that of the single SnO 2 and Cs 3 Bi 2 I 9 , respectively. Moreover, the SC2 photocatalyst shows only 3 % attenuation after five consecutive cycles, demonstrating good photocatalytic stability. Systematic experimental characterization and theoretical density functional theory calculations revealed that the high activity and stability of SCX originated from the efficient charge transfer at the confined interface between SnO 2 and Cs 3 Bi 2 I 9 quantum dots . This work provides a new perspective for constructing innovative dual-quantum-dots nanoheterostructure and assesses their potential in photocatalytic environmental applications.
研究领域:
材料科学
·
环境科学
·
理论计算
✓ 已验证
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2024
·
IF 8
Weining Liu,Hairong Li,Dandan Huang,Xi Tan,Mingyang Zhao,Qionglin Cheng,Ming Yi,Qi Ding,Yaqian Ren,Guohan Liu
Triethylamine (TEA) poses severe safety hazards to industrial production and human health. To accurately detect TEA concentrations and rapidly warn of leakage, a simple reflux condensation method was deployed to successfully incorporate Zn 2+ in situ into Mo-MOFs precursor in a green, safe, and time-efficient synthesis condition. Subsequently, through calcination, MoO 3 /ZnMoO 4 -X (MMZ-X) were prepared, which exhibited an increased number of defects and enriched porosity, facilitating the access and interaction of TEA with adsorption sites. Simultaneously, rationally built in situ MoO 3 /ZnMoO 4 heterostructures accelerated carrier migration and induced a drastic resistive change. MMZ-2 demonstrated outstanding TEA sensing performance, exhibiting extremely high sensitivity ( R = 572.3, 100 ppm), along with superior selectivity, repeatability and stability, rapid response and recovery times, and a low detection limit. Moreover, the key intrinsic parameters of the heterostructure on the atomic scale were determined by density functional theory (DFT) calculations, providing a detailed elucidation of the sensing enhancement mechanism of the MoO 3 /ZnMoO 4 heterostructure. The simple and efficient synthesis method and the related mechanistic analysis pave a new path for designing high-performance TEA gas sensors with practical applications.
研究领域:
材料科学
·
化学传感器
·
环境监测
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）