? Chinese Journal of Catalysis
? 催化学报
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Chinese Journal of Catalysis
2019, Vol.40 No.1
Online: 18 January 2019


Contents | Academic discussion | Reviews | Communication | Articles |

Xi’s group controls the synthesis of the silk-like FeS2/NiS2 hybrid nanocrystal. The material has rich interfaces and defects, which is beneficial to enhance its catalytic performance. The picture shows the flexible battery assembled by this catalyst and their promising application. Read more about the article behind the cover on pages 43–51.

 
Contents
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Table of Contents for VOL.40 No.1
2019 Vol. 40 (1): 0-0 [Abstract] ( 31 ) [Full Text(HTML)] () 1KB] [PDF 2967KB] ( 30 )    DOI:

Academic discussion
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Frederic Meunier
Comment on the correction of gas-phase signals during IR operan-do analyses
2019 Vol. 40 (1): 1-3 [Abstract] ( 69 ) [Full Text(HTML)] () 1KB] [PDF 582KB] ( 61 )    DOI: 10.1016/S1872-2067(18)63188-2

Reviews
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Ping Li, Wei Chen
Recent advances in one-dimensional nanostructures for energy electrocatalysis
2019 Vol. 40 (1): 4-22 [Abstract] ( 125 ) [Full Text(HTML)] () 1KB] [PDF 3379KB] ( 202 )    DOI: 10.1016/S1872-2067(18)63177-8

Catalysts play decisive roles in determining the energy conversion efficiencies of energy devices. Up to now, various types of nanostructured materials have been studied as advanced electrocatalysts. This review highlights the application of one-dimensional (1D) metal electrocatalysts in energy conversion, focusing on two important reaction systems-direct methanol fuel cells and water splitting. In this review, we first give a broad introduction of electrochemical energy conversion. In the second section, we summarize the recent significant advances in the area of 1D metal nanostructured electrocatalysts for the electrochemical reactions involved in fuel cells and water splitting systems, including the oxygen reduction reaction, methanol oxidation reaction, hydrogen evolution reaction, and oxygen evolution reaction. Finally, based on the current studies on 1D nanostructures for energy electrocatalysis, we present a brief outlook on the research trend in 1D nanoelectrocatalysts for the two clean electrochemical energy conversion systems mentioned above.

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Chengcheng Yan, Long Lin, Guoxiong Wang, Xinhe Bao
Transition metal-nitrogen sites for electrochemical carbon dioxide reduction reaction
2019 Vol. 40 (1): 23-37 [Abstract] ( 56 ) [Full Text(HTML)] () 1KB] [PDF 4758KB] ( 128 )    DOI: 10.1016/S1872-2067(18)63161-4

Electrochemical CO2 reduction reaction (CO2RR) powered by renewable electricity has emerged as the most promising technique for CO2 conversion, making it possible to realize a carbon-neutral cycle. Highly efficient, robust, and cost-effective catalysts are highly demanded for the near-future practical applications of CO2RR. Previous studies on atomically dispersed metal-nitrogen (M-Nx) sites constituted of earth abundant elements with maximum atom-utilization efficiency have demonstrated their performance towards CO2RR. This review summarizes recent advances on a variety of M-Nx sites-containing transition metal-centered macrocyclic complexes, metal organic frameworks, and M-Nx-doped carbon materials for efficient CO2RR, including both experimental and theoretical studies. The roles of metal centers, coordinated ligands, and conductive supports on the intrinsic activity and selectivity, together with the importance of reaction conditions for improved performance are discussed. The mechanisms of CO2RR over these M-Nx-containing materials are presented to provide useful guidance for the rational design of efficient catalysts towards CO2RR.

Communication
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Zheng Chen, Qinge Huang, Baokun Huang, Fuxiang Zhang, Can Li
A hydrated amorphous iron oxide nanoparticle as active water oxidation catalyst
2019 Vol. 40 (1): 38-42 [Abstract] ( 34 ) [Full Text(HTML)] () 1KB] [PDF 1444KB] ( 48 )    DOI: 10.1016/S1872-2067(18)63190-0

Developing efficient water oxidation catalysts (WOCs) with earth-abundant elements still remains a challenging task for artificial photosynthesis. Iron-based WOC is a promising candidate because it is economically cheap, little toxic and environmentally friendly. In this study, we found that the catalytic water oxidation activity on amorphous iron-based oxide/hydroxide (FeOx) can be decreased by an order of magnitude after the dehydration process at room temperature. Thermogravimetric analysis, XRD and Raman results indicated that the dehydration process of FeOx at room temperature causes the almost completely loss of water molecule with no bulk structural changes. Based on this finding, we prepared hydrated ultrasmall (ca. 2.2 nm) FeOx nanoparticles of amorphous feature, which turns out to be extremely active as WOC with turnover frequency (TOF) up to 9.3 s-1 in the photocatalytic Ru(bpy)32+-Na2S2O8 system. Our findings suggest that future design of active iron-based oxides as WOCs requires the consideration of their hydration status.

Articles
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Jing Jin, Jie Yin, Hanwen Liu, Pinxian Xi
Synthesis of silk-like FeS2/NiS2 hybrid nanocrystals with improved reversible oxygen catalytic performance in a Zn-air battery
2019 Vol. 40 (1): 43-51 [Abstract] ( 39 ) [Full Text(HTML)] () 1KB] [PDF 2724KB] ( 76 )    DOI: 10.1016/S1872-2067(18)63175-4

The development of highly active and stable reversible oxygen electrocatalysts is crucial for improving the efficiency of metal-air battery devices. Herein, an efficient liquid exfoliation strategy was designed for producing silk-like FeS2/NiS2 hybrid nanocrystals with enhanced reversible oxygen catalytic performance that displayed excellent properties for Zn-air batteries. Because of the unique silk-like morphology and interface nanocrystal structure, they can catalyze the oxygen evolution reaction (OER) efficiently with a low overpotential of 233 mV at j=10 mA cm-2. This is an improvement from the recently reported catalysts in 1.0 M KOH. Meanwhile, the oxygen reduction reaction (ORR) activity of the silk-like FeS2/NiS2 hybrid nanocrystals showed an onset potential of 911 mV and a half-wave potential of 640 mV. In addition, the reversible oxygen electrode activity of the silk-like FeS2/NiS2 hybrid nanocrystals was calculated to be 0.823 V, based on the potential of the OER and ORR. Further, the homemade rechargeable Zn-air batteries using FeS2/NiS2 hybrid nanocrystals as the air-cathode displayed a high open-circuit voltage of 1.25 V for more than 17 h and an excellent rechargeable performance for 25 h. The solid Zn-air batteries exhibited an excellent rechargeable performance for 15 h. This study provided a new method for designing interface nanocrystals with a unique morphology for efficient multifunctional electrocatalysts in electrochemical reactions and renewable energy devices.

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Dawei He, Danhua Yuan, Zhijia Song, Yunpeng Xu, Zhongmin Liu
Eco-friendly synthesis of high silica zeolite Y with choline as green and innocent structure-directing agent
2019 Vol. 40 (1): 52-59 [Abstract] ( 28 ) [Full Text(HTML)] () 1KB] [PDF 2201KB] ( 34 )    DOI: 10.1016/S1872-2067(18)63167-5

Zeolite synthesis in contemporary chemical industries is predominantly conducted using organic structure-directing agents (OSDAs), which are chronically hazardous to humans and the environment. It is a growing trend to develop an eco-friendly and nuisanceless OSDA for zeolite synthesis. Herein, choline is employed as a non-toxic and green OSDA to synthesize high silica Y zeolite with SiO2/Al2O3 ratios of 6.5-6.8. The prepared Y zeolite samples exhibited outstanding (hydro)thermal stability at ultrahigh temperature owing to the higher SiO2/Al2O3 ratio. The XRF, SEM, 29Si-NMR and 13Na+ results suggested that choline plays a structure-directing role in the synthesis of Y zeolite, while the feed molar fraction of Na+ is a crucial determinant for the framework SiO2/Al2O3 ratio and the crystal morphology.

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Yongchuan Wu, Zhongmin liu, Yaru Li, Jitao Chen, Xixi Zhu, Ping Na
Construction of 2D-2D TiO2 nanosheet/layered WS2 heterojunctions with enhanced visible-light-responsive photocatalytic activity
2019 Vol. 40 (1): 60-69 [Abstract] ( 74 ) [Full Text(HTML)] () 1KB] [PDF 4352KB] ( 75 )    DOI: 10.1016/S1872-2067(18)63170-5

Constructing nanocomposites that combine the advantages of composite materials, nanomaterials, and interfaces has been regarded as an important strategy to improve the photocatalytic activity of TiO2. In this study, 2D-2D TiO2 nanosheet/layered WS2 (TNS/WS2) heterojunctions were prepared via a hydrothermal method. The structure and morphology of the photocatalysts were systematically characterized. Layered WS2 (~4 layers) was wrapped on the surface of TiO2 nanosheets with a plate-to-plate stacked structure and connected with each other by W=O bonds. The as-prepared TNS/WS2 heterojunctions showed higher photocatalytic activity for the degradation of RhB under visible-light irradiation, than pristine TiO2 nanosheets and layered WS2. The improvement of photocatalytic activity was primarily attributed to enhanced charge separation efficiency, which originated from the perfect 2D-2D nanointerfaces and intimate interfacial contacts between TiO2 nanosheets and layered WS2. Based on experimental results, a double-transfer photocatalytic mechanism for the TNS/WS2 heterojunctions was proposed and discussed. This work provides new insights for synthesizing highly efficient and environmentally stable photocatalysts by engineering the surface heterojunctions.

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Xuedong Du, Xiaohong Yi, Peng Wang, Jiguang Deng, Chong-chen Wang
Enhanced photocatalytic Cr(VI) reduction and diclofenac sodium degradation under simulated sunlight irradiation over MIL-100(Fe)/g-C3N4 heterojunctions
2019 Vol. 40 (1): 70-79 [Abstract] ( 55 ) [Full Text(HTML)] () 1KB] [PDF 2315KB] ( 59 )    DOI: 10.1016/S1872-2067(18)63160-2

Metal-organic framework MIL-100(Fe) and g-C3N4 heterojunctions (MG-x, x=5%, 10%, 20%, and 30%, x is the mass fraction of MIL-100(Fe) in the hybrids) were facilely fabricated through ball-milling and annealing, and characterized by powder X-ray diffraction, Fourier transform infrared spectroscopy, thermogravimetric analysis, transmission electron microscopy, UV-visible diffuse-reflectance spectrometry, and photoluminescence emission spectrometry. The photocatalytic activities of the series of MG-x heterojunctions toward Cr(VI) reduction and diclofenac sodium degradation were tested upon irradiation with simulated sunlight. The influence of different organic compounds (ethanol, citric acid, oxalic acid, and diclofenac sodium) as hole scavengers and the pH values (2, 3, 4, 6, and 8) on the photocatalytic activities of the series of MG-x heterojunctions was investigated. MG-20% showed superior photocatalytic Cr(VI) reduction and diclofenac sodium degradation performance than did the individual MIL-100(Fe) and g-C3N4 because of the improved separation of photoinduced electron-hole charges, which was clarified via photoluminescence emission and electrochemical data. Moreover, the MG-x exhibited good reusability and stability after several runs.

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Linlin Sun, Chongyang Liu, Jinze Li, Yaju Zhou, Huiqin Wang, Pengwei Huo, Changchang Ma, Yongsheng Yan
Fast electron transfer and enhanced visible light photocatalytic activity by using poly-o-phenylenediamine modified AgCl/g-C3N4 nanosheets
2019 Vol. 40 (1): 80-94 [Abstract] ( 33 ) [Full Text(HTML)] () 1KB] [PDF 995KB] ( 37 )    DOI: 10.1016/S1872-2067(18)63172-9

Exfoliation of bulk graphitic carbon nitride (g-C3N4) into two-dimensional (2D) nanosheets is one of the effective strategies to improve its photocatalytic properties so that the 2D g-C3N4 nanosheets (CN) have larger specific surface areas and more reaction sites. In addition, poly-o-phenylenediamine (PoPD) can improve the electrical conductivity and photocatalytic activity of semiconductor materials. Here, the novel efficient composite PoPD/AgCl/g-C3N4 nanosheets was first synthesized by a precipitation reaction and the photoinitiated polymerization approach. The obtained photocatalysts have larger specific surface areas and could achieve better visible-light response. However, silver chloride (AgCl) is susceptible to agglomeration and photocorrosion. The PoPD/AgCl/CN composite exhibits an extremely high photocurrent density, which is three times that of CN. Obviously enhanced photocatalytic activities of PoPD/AgCl/g-C3N4 are revealed through the photodegradation of tetracycline. The stability of PoPD/AgCl/CN is demonstrated based on four cycles of experiments that reveal that the degradation rate only decreases slightly. Furthermore,·O2- and h+ are the main active species, which are confirmed through a trapping experiment and ESR spin-trap technique. Therefore, the prepared PoPD/AgCl/CN can be considered as a stable photocatalyst, in which PoPD is added as a charge carrier and acts a photosensitive protective layer on the surface of the AgCl particles. This provides a new technology for preparing highly stable composite photocatalysts that can effectively deal with environmental issues.

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Jun Cao, Xiaojiang Yao, Fumo Yang, Li Chen, Min Fu, Changjin Tang, Lin Dong
Improving the denitration performance and K-poisoning resistance of the V2O5-WO3/TiO2 catalyst by Ce4+ and Zr4+ co-doping
2019 Vol. 40 (1): 95-104 [Abstract] ( 30 ) [Full Text(HTML)] () 1KB] [PDF 1124KB] ( 78 )    DOI: 10.1016/S1872-2067(18)63184-5

A series of V2O5-WO3/TiO2-ZrO2, V2O5-WO3/TiO2-CeO2, and V2O5-WO3/TiO2-CeO2-ZrO2 catalysts were synthesized to improve the selective catalytic reduction (SCR) performance and the K-poisoning resistance of a V2O5-WO3/TiO2 catalyst. The physicochemical properties were investigated by using XRD, BET, NH3-TPD, H2-TPR, and XPS, and the catalytic performance and K-poisoning resistance were evaluated via a NH3-SCR model reaction. Ce4+ and Zr4+ co-doping were found to enhance the conversion of NOx, and exhibit the best K-poisoning resistance owing to the largest BET-specific surface area, pore volume, and total acid site concentration, as well as the minimal effects on the surface acidity and redox ability from K poisoning. The V2O5-WO3/TiO2-CeO2-ZrO2 catalyst also presents outstanding H2O + SO2 tolerance. Finally, the in situ DRIFTS reveals that the NH3-SCR reaction over the V2O5-WO3/TiO2-CeO2-ZrO2 catalyst follows an L-H mechanism, and that K poisoning does not change the reaction mechanism.

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Denghui Jiang, Yuegang Zhang, Xinheng Li
Synergistic effects of CuO and Au nanodomains on Cu2O cubes for improving photocatalytic activity and stability
2019 Vol. 40 (1): 105-113 [Abstract] ( 43 ) [Full Text(HTML)] () 1KB] [PDF 3771KB] ( 70 )    DOI: 10.1016/S1872-2067(18)63164-X

Cu2O is a promising photocatalyst, but it suffers from poor photocatalytic activity and stability, especially for Cu2O cubes. Herein, we report the deposition of CuO and Au nanodomains on Cu2O cubes to form dual surface heterostructures (HCs) to improve photocatalytic activity and stability. The apparent quantum efficiency of Au/CuO/Cu2O HCs was ca. 123 times that of pristine Cu2O. In addition, the Au/CuO/Cu2O HCs maintained nearly 80% of its original activity after eight cycles in contrast to five cycles for the Au/Cu2O material. Therefore, CuO and Au domains greatly improved the photocatalytic activity and stability of the Cu2O cubes due to the synergistic effect of the HCs.

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Yaping Zhou, Yongcheng Ma, Guojun Lan, Haodong Tang, Wenfeng Han, Huazhang Liu, Ying Li
A highly stable and active mesoporous ruthenium catalyst for ammonia synthesis prepared by a RuCl3/SiO2-templated approach
2019 Vol. 40 (1): 114-123 [Abstract] ( 41 ) [Full Text(HTML)] () 1KB] [PDF 4448KB] ( 83 )    DOI: 10.1016/S1872-2067(18)63192-4

Molecular nitrogen is relatively inert and the activation of its triple bond is full of challenges and of significance. Hence, searching for an efficiently heterogeneous catalyst with high stability and dispersion is one of the important targets of chemical technology. Here, we report a Ba-K/Ru-MC catalyst with Ru particle size of 1.5-2.5 nm semi-embedded in a mesoporous C matrix and with dual promoters of Ba and K that exhibits a higher activity than the supported Ba-Ru-K/MC catalyst, although both have similar metal particle sizes for ammonia synthesis. Further, the Ba-K/Ru-MC catalyst is more active than commercial fused Fe catalysts and supported Ru catalysts. Characterization techniques such as high-resolution transmission electron microscopy, N2 physisorption, CO chemisorption, and temperature-programmed reduction suggest that the Ru nanoparticles have strong interactions with the C matrix in Ba-K/Ru-MC, which may facilitate electron transport better than supported nanoparticles.

催化学报

Chinese Journal of
Catalysis
Started in 1980
Issues per year: 12
Supervised by
Chinese Academy of Sciences
Sponsored by
Dalian Institute of Chemical Physics, Chinese Academy of Sciences, and the Chinese Chemical Society

 

Published by

 

 

Editors-in-Chief
Can Li, Tao Zhang
ISSN 0253-9837
CODEN THHPD3
CN 21-1195/O6
Domestic code number
8-93

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