Catalysts
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2021
·Vol. 11
·期 2
·169
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IF 4.146
Yan Tan,Yijun Yin,Xianhong Yin,Chenghao Lan,Yu Wang,Feilong Hu,Qin Huang,Yan Mi
The pursuit of low-cost and high-efficiency catalyst is imperative for the development and utilization of hydrogen energy. Heteroatomic doping which is conducive to the redistribution of electric density is one of the promising strategies to improve catalytic activity. Herein, the Se-doped CoS2porous nanowires array with a superaerophobic surface was constructed on carbon fiber. Due to the electronic modulation and the unique superaerophobic structure, it showed improved hydrogen evolution activity and stability in urea-containing electrolyte. At a current density of 10 mA cm−2, the overpotentials are 188 mV for hydrogen evolution reaction (HER) and 1.46 V for urea oxidation reaction (UOR). When it was set as a cell, the voltage is low as 1.44 V. Meanwhile, the current densities of HER and UOR, as well as of cell remained basically unchanged after a continuous operation for 48 h. This work opens up a new idea for designing of cost-saving hydrogen evolution electrocatalysts.Keywords:superaerophobic;cost-saving hydrogen evolution;heteroatom doping;electronic adjustment
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SOLID STATE SCIENCES
·
2021
·
IF 3.059
Lin Liu,Moying Li,Peng Jiang,Kunyang Cui,Yuqian Wang,Jianlei Kuang,Wenbin Cao
The solid solution of YIn 1- x Mn x O 3 shows intense blue colors as well as excellent properties. In this paper, N- and N/S- doped YIn 1- x Mn x O 3 samples are successfully prepared by the high-energy ball milling method with hexamethylenetetramine (C 6 H 12 N 4 ), urea (CH 4 N 2 O) and thiourea (CH 4 N 2 S). The X-ray diffraction patterns of samples with various anion doping all show single phase and the oxidation state of Mn are maintained as +3. In C 6 H 12 N 4 treated YIn 0.7 Mn 0.3 O 3 , N is in the interstitial site while in CH 4 N 2 O treated YIn 0.7 Mn 0.3 O 3 , N exists in both interstitial site and substitution site. In CH 4 N 2 S treated YIn 0.7 Mn 0.3 O 3 , both S and N are in the substitution site and interstitial site. Due to the anion doping by N and S, the optical properties of the samples are modified and analyzed.
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Journal of Energy Storage
·
2021
·
IF 6.583
Tao Wang,Weibing Ma,Yuxin Zhang,Jingdong Guo,Tingting Li,Shenghui Wang,De’an Yang
The core-shell CoMoO 4 nanorods@Ni 3 S 2 nanosheets (CMO@NS) for supercapacitor were prepared by a facile two-step hydrothermal process accompanying with annealing treatment. The influence of hydrothermal time on structures and electrochemical properties was studied in detail. Benefiting from the synergism-enhanced action of CoMoO 4 and Ni 3 S 2 and the novel core-shell heterostructure of the composite, the prepared electrode exhibits excellent electrochemical performance. CMO@NS employed as positive electrode for supercapacitor exhibits excellent areal specific capacitance (11.02 F cm −2 at 5 mA cm −2 ), exceptional rate performance (70.8% retention, even increasing the current density to 30 mA cm −2 ) and enhanced cycle performance (57.7% retention rate after 3000 cycles). Furthermore, an asymmetric supercapacitor device was fabricated, which achieves an ultra-high energy density of 0.412 mWh cm −2 at the power density of 4 mW cm −2 and a great cycle life with 81.25% capacitance retention over 3000 cycles. Thus, the core-shell CMO@NS could be a hopeful candidate for practical supercapacitor electrode materials.
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CARBON
·
2021
·
IF 9.594
Xing-hai Zhou,Yuan Gao,Li-hua Lyu,Yue-yao Liang,Zhen-huan Li
The rational design of electrode architecture coupling with high specific capacity nanomaterials is highly desirable to build superior energy storage system . Herein, molybdenum-based compounds embedded in flexible 3D interconnected porous carbon nanofibers with protective porous carbon shell are constructed via a facile electro-blowing spinning technique using as free-standing lithium-ion battery (LIB) anodes. Such a well-designed architecture possesses large surface area, protective porous carbon shell and 3D interconnected porous structure . Moreover, various high specific capacity molybdenum-based compounds, including MoS 2 , MoO 2 and MoN, can homogenously disperse within the fibers under different carbonization condition, especially, some of them are bridged to the fiber skeleton through a thin graphite carbon layer . The synergetic coupling effects benefited from the structural and material advantages are effective to provide more lithium-ion storage active sites, fast electrons/ions transfer pathways and good structural integrity. Using as free-standing anodes of LIB, the three fibrous anodes deliver an excellent electrochemical performance in terms of high specific capacity, superior rate capability and satisfied cycling stability. Extraordinarily, the well-designed architecture of fibrous anodes might open a new paradigm to boost the creation of high-performance electrodes for various energy storage devices.
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ELECTROCHIMICA ACTA
·
2021
·
IF 6.901
Xiaojing Zhu,Qikai Wu,Jiale Dai,Dengke Zhao,Chenghao Yang,Ligui Li,Nanwen Li,Shaowei Chen
Directly pyrolyzing organometal complex represents a judicious strategy to fabricate efficient multifunctional carbon-based electrocatalysts , but the structure/composition of the catalysts is commonly complicated and the corresponding electrocatalytic activities are usually compromised. In this study, we report a selective leaching route to prepare small Co 9 S 8 nanoparticles supported on nitrogen, sulfur codoped porous carbon nanosheets (Co 9 S 8 @PNSC) by pyrolyzing sheet-like Co(II)-coordinated thiourea-ethylenediamine-formaldehyde resin (Co-TEFR)/polydopamine (PDA) hybrids that are covered by silica shell layer, followed by removal of the silica and Co nanoparticles with NH 4 HF 2 through a wet etching method. Consequently, the resultant Co 9 S 8 @PNSC exhibits high specific surface area, hierarchical porosity and tiny Co 9 S 8 nanoparticles, which are conducive to the maximal utilization of active sites, endowing remarkable oxygen electrocatalysis with a half-wave potential of +0.845 V for oxygen reduction reaction and a low overpotential of 314 mV at current density of 10 mA cm −2 for oxygen evolution reaction. Besides, such composite also shows a considerable electrocatalytic performance for hydrogen generation. When applied in an assembled zinc-air battery, Co 9 S 8 @PNSC displays a high power-density (203 mW cm −2 ) and favorable cycling lifespan. The results from the present strategy may provide an exemplification in rational design and fabrication of carbon-based nanocomposite for high-performance multifunctional electrocatalysis.
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Environmental Science-Nano
·
2021
·Vol. 8
·期 5
·1389-1397
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IF 8.131
Cheng Cheng,Dongyun Chen,Najun Li,Hua Li,Qingfeng Xu,Jinhui He,Jianmei Lu
Hexavalent chromium (Cr(VI)) poses a serious threat to the environment and human health due to its high-toxicity and carcinogenicity. For efficient removal of Cr(VI), semiconductor photocatalytic reduction methods have been investigated, especially those using hollow structures. In this work, a hollow In2S3/CdIn2S4 composite photocatalyst was prepared via ion exchange for the reduction of Cr(VI). The microstructure, composition, optical properties, and elements of the In2S3/CdIn2S4 composites were characterized via scanning electron microscopy, X-ray diffraction, UV-vis diffuse reflectance spectroscopy, and X-ray photoelectron spectroscopy. Because of the molecular level heterojunction constructed through ion exchange and the hollow structure, the prepared photocatalyst demonstrated excellent catalytic properties for Cr(VI) reduction. Besides, a Cr(VI) aqueous solution (50 mg L−1) was reduced within 12 min. Importantly, the activity and structure of the photocatalyst were maintained after five cycling experiments, which demonstrates its advantageous stability. Finally, the photocatalytic mechanism is discussed in detail.
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ACS Applied Materials & Interfaces
·
2021
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IF 9.229
Yaping Cao,Hui Chen,Yupeng Shen,Mei Chen,Yelong Zhang,Lanying Zhang,Qian Wang,Shaojun Guo,Huai Yang
Potassium-ion batteries (KIBs) are emerging as the prospective alternatives to lithium-ion batteries in energy storage systems owing to the sufficient resources and relatively low cost of K-related materials. However, serious volume expansion and low specific capacity are found in most materials systems resulting from the large intrinsic radius of K+. Herein, SnS2 nanosheets anchored on nitrogen and sulfur co-doped MXene (SnS2 NSs/MXene) are creatively designed as advanced anode materials for KIBs. SnS2 NSs/MXene with a unique hierarchical structure can not only provide fast transmission channels for K+ but also avoid the accumulation of K+ and volume expansion. These novel features make SnS2 NSs/MXene electrodes exhibit a superior reversible specific capacity of 342.4 mA h g–1 under 50 mA g–1. Also, they maintain 206.1 mA h g–1 at an even higher current density of 0.5 A g–1 over 800 cycles almost without capacity decay. Moreover, the multistep alloying reaction mechanism of SnS2 NSs/MXene composites and K+ is revealed by the ex situ X-ray diffraction measurement. In addition, the density functional theory calculations confirm the existence of Ti–S bonds between SnS2 nanosheets and MXene, which significantly enhance the structural stability and cycling electrochemical performance of SnS2 NSs/MXene composites.
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PubMed
高影响因子
CRYSTENGCOMM
·
2021
·Vol. 23
·期 16
·2938-2944
·
IF 3.545
Lijia Guo,Manying Liu,Yan Lei,Liwei Mi,Zhi Zheng
Inorganic perovskite CsPbBr3 is a suitable candidate owing to its excellent stability and outstanding visible light absorption. However, it is a huge challenge to fabricate single phase CsPbBr3 films. Herein, we developed an in situ metal reaction strategy to fabricate single phase CsPbBr3 films by reacting Pb precursors with CsBr/HBr in methanol solution. The thickness of the sputtered Pb film plays a key role in inhibiting the formation of a secondary CsPb2Br5 phase. The results indicate that the single phase CsPbBr3 films can be obtained by using below 40 nm of the sputtered Pb films, and the single phase CsPbBr3 device architecture exhibits 4.08% power conversion efficiency. This device can retain over 95% of the initial efficiency after 30 days of storage without packaging in an ambient environment.
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Journal of Analytical Science and Technology
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2021
·Vol. 12
·期 1
·1-9
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IF 2.769
Dong Bin,Fan Qian,Li Ming,Huan Yanfu,Feng Guodong,Shan Hongyan,Fei Qiang
In this study, N-(4-aminobutyl)-N-ethylisoluminol (ABEI) was used as an energy donor, while sodium fluorescein was used as an enhancer and energy acceptor, which resulted in it producing resonance energy transfer and greatly increasing the strength of chemiluminiscence (CL). When horseradish peroxidase (HRP) is added, hydrogen peroxide (H2O2) will quickly separate into hydroxyl radicals (·OH) and superoxide ions (O2·−). If tyrosine (Tyr) is present in the system, the hydroxyl group on the benzene ring of Tyr robs ·OH and O2·− in the CL system, thereby reducing the intensity of CL. Based on this phenomenon, a luminescence system of ABEI and sodium fluorescein system was established to detect Tyr for the first time. This method has an ultra-low detection limit and a wide linear range, and is cheap and easy to operate. Under various optimal conditions, the linear range is from 3.0×10−8 to 3.0×10−5 mol/L, and the limit of detection is 2.4×10−8 mol/L. It has been successfully used in the detection of dairy products with satisfactory results.
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ACS Applied Materials & Interfaces
·
2021
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IF 9.229
Jing Chen,Mingzheng Gu,Shoujie Liu,Tian Sheng,Xiaojun Zhang
Modifying the electronic structure of electrocatalysts by metal doping is favorable to their electrocatalytic activity. Herein, by a facile one-pot redox process of Fe(III) and Cu(I), Fe(II) was successfully doped into the subsurface of CuS nanosheets (NSs) for the first time to obtain a novel electrocatalyst (Fesub-CuS NSs) that possesses not only subtle lattice defects but also an atomic-level coupled nanointerface, greatly enhancing the oxygen evolution reaction (OER) performances. Meanwhile, Fe(II) and Fe(III) coexisting in Fesub-CuS nanosheets are favorable to OER through valence regulation. As expected, by simultaneously controlling the abovementioned three factors to optimize Fesub-CuS nanosheets, they display a lower overpotential of 252 mV at a current density of 20 mA cm–2 for OER, better than 389 mV for pristine CuS nanosheets. This discovery furnishes low-cost and efficient Cu-based electrocatalysts by metal doping. Density functional theory (DFT) calculations further verify that Fesub-CuS(100) is thermodynamically stable and is more active for OER. This research provides a strategy for the atomic-scale engineering of nanocatalysts and also sheds light on the design of novel and efficient electrocatalysts.
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PubMed
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2021
·
IF 7.312
Ping Sun,Hui Liu,Mingbao Feng,Xuesheng Zhang,Yingsen Fang,Zhicai Zhai,Virender K. Sharma
This work demonstrates for the first time the potential application of a novel nonradical oxidation system consisting of N/S co-doped ordered mesoporous carbon (NS-CMK-3) and peroxymonosulfate (PMS). The results showed that the NS-CMK-3 catalyst effectively activated PMS to completely degrade pharmaceutical acetaminophen (ACT). The catalytic performance of NS-CMK-3 was ~20 and 10 times better than that of pristine CMK-3 and single N-doped one (N-CMK-3), respectively. The oxidative system could also remove other pollutants (i.e., sulfathiazole, trans -ferulic acid, orange G, and phenol). A higher content of N (5.3 at.%) and a distribution of graphite-N (28.1%) were determined in NS-CMK-3 than in N-CMK-3. The synergistic effect of N/S co-doping (i.e., graphite-N and thiophene-S) resulted in the enhanced catalytic performance. The activation of PMS by NS-CMK-3 primarily followed two nonradical pathways (i.e., singlet oxygen and catalyst surface-bound reactive PMS complexes), supported by quenching experiments and electron paramagnetic resonance measurements. The p -benzoquinone ( p -BQ) and ACTdimer were main degradation products. The removal of total organic carbon (TOC) was ≈27%, suggesting nonradicals could mineralize ACT. The NS-CMK-3 not only demonstrated superior stability owing to a removal efficiency that was still as high as 98% in the fifth recycle run, but also significantly decreased the potential effects of water constituents (e.g., Cl − , NO 3 − , HCO 3 − , and humic acid) on the removal process. The NS-CMK-3/PMS oxidative system offers a novel strategy to carry out environmental remediation via nonradical processes.
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Journal of Cleaner Production
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2021
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IF 9.297
Chao Chen,Zhonglin Chen,Jimin Shen,Jing Kang,Shengxin Zhao,Binyuan Wang,Qian Chen,Xueyan Li
In this paper, a dendrimer-grafted polyacrylonitrile fiber (PANF-TU) was successfully synthesized and characterized by scanning electron microscope with energy dispersive spectroscopy for removal of mercury. Adsorption feasibility was thoroughly studied during batch and dynamic tests. Adsorption kinetics , isotherms and effects of pH and coexisting substances were performed with the maximum adsorption capacity of 227 mg g −1 . The better fitting characteristics of pseudo-second-order and Langmuir models revealed the dominant role of monolayer chemisorption during the adsorption process . Various variables in dynamic adsorption process were investigated and the results revealed the tendency of adsorption capacity increased with the decrease of inflow rate and the increase of bed depth and initial concentration, and reached a higher adsorption capacity under appropriate environmental conditions. Thomas, Bohart-Adams, Yoon-Nelson and bed depth service time models were applied to predict experimental data, exhibiting satisfactory fitting results. According to artificial neural network simulation, the relative importance of operation parameters was in the sequence of inflow duration > bed depth > flow rate > influent pH > initial concentration > influent temperature. Furthermore, the adsorption performance of PANF-TU kept well during five times regeneration, which indicated the adsorbent might be a promising material for remediation of Hg 2+ polluted aqueous systems.
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