NANOTECHNOLOGY
·
2022
·Vol. 33
·期 38
·385501
·
IF 3.953
Yanxin Liao,Qian Du,Shupei Sun,Nianfeng Shi,Guangfu Yin,Zhongbing Huang,Xiaoming Liao
Self-supported Cu2S/Cu(OH)2 composite nanorods for highly sensitive non-enzymatic glucose sensing were in situ grown on Cu foam by simple hydrothermal treatment of aligned Cu(OH)2 nanorods. The physicochemical and electrochemical properties of the as-fabricated Cu2S/Cu(OH)2 composite nanorods were characterized by scanning electron microscopy, transmission electron microscopy, x-ray diffraction, Raman spectroscope, x-ray photoelectron spectroscope, cyclic voltammetry, electrochemical impedance spectroscopy, amperometric i–t measurements. The mechanism of the composite nanorods produced on conductive substrates was also explored. The electrode exhibits a sensitivity of 9626.88 μA mM−1 cm−2 towards glucose with good anti-interference ability, indicating it a promising electrode material for the enhanced non-enzymatic glucose detection.
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高影响因子
INORGANIC CHEMISTRY
·
2022
·
IF 5.436
Hu Yang,Aichuang Zhang,Yunfei Bai,Mingyu Chu,Han Li,Yuan Liu,Peng Zhu,Xiaolei Chen,Chengwei Deng,Xiaolei Yuan
Even though extensive efforts have been devoted to mixing Pd nanocrystals with Ni(OH)2 for the enhanced synergy, it remains a great challenge to incorporate nanosized Ni(OH)2 species on the Pd electrode and reveal their synergy. Herein, we present spongelike Pd nanocrystals with the modification of amorphous Ni(OH)2 species. The catalyst configuration is first considered by compositing Pd with Ni(OH)2 species to optimize the Pd–Pd interatomic distance and then constructing a strongly coupled interface between Pd nanostructures and Ni(OH)2 species. For the ethanol oxidation reaction (EOR) and the formic acid oxidation reaction (FAOR), Pd-Ni(OH)2 composites exhibit an impressive mass activity of 4.98 and 2.65 A mgPd–1, respectively. Most impressively, there is no significant decrease in the EOR activity during five consecutive cycles (50 000 s). A series of CO-poisoning tests have proved that the enhanced EOR and FAOR performances involve synergy between Pd nanostructures and Ni(OH)2 species.
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CHEMOSPHERE
·
2022
·
IF 8.943
Shiwei Lai,Haiqian Zhao,Zhibin Qu,Ziyu Tang,Xue Yang,Peng Jiang,Zhonghua Wang
The mismatch of pollutant concentration and ·OH concentration is the key reason for the inefficient degradation of formaldehyde in the electro-Fenton system. Therefore, formaldehyde and ·OH are adsorbed near the cathode, and the high concentration reaction region is constructed to increase the reaction probability, which is called control of the reaction region. Through nitrogen doping modification of the activated carbon cathode, the adsorption capacity of the modified cathode for formaldehyde and active species, and the selectivity of the two-electron oxygen reduction reaction were deeply analyzed. The results show that the suitable nitrogen doping form of the modified cathode significantly promotes the adsorption capacity of formaldehyde and H 2 O 2 , which is beneficial to realizing the promotion of formaldehyde degradation by nitrogen doped cathodes in the electro-Fenton system through control of the reaction region. Graphite nitrogen and pyrrolic nitrogen improve formaldehyde adsorption by enhancing the van der Waals force (8.897 mg g −1 ), and pyridinic nitrogen improve H 2 O 2 adsorption (1.841 mg g −1 ) by enhancing the effect of hydrogen bonding interaction. Nitrogen doping enhances Fe 2+ regeneration, which contributes to the generation of ·OH at the cathode, and promotes formaldehyde degradation. The control of the reaction region through modification of the electro-Fenton cathode achieved formaldehyde degradation of 35.1 mg L −1 (48.51% higher than that of the unmodified cathode), which provides a promising process for formaldehyde treatment.
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CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Chu Dai,Xike Tian,Yulun Nie,Wei Fu,Jiatang Wang
Most researches focus on design and optimization of heterogeneous Fenton catalyst itself to drive H 2 O 2 decomposition into • OH radicals. In this study, we reported the significant impact of the interaction mode of H 2 O 2 and CuMnO 2 (namely H 2 O 2 occurrence form) on the Fenton-like performance. The interaction mode of H 2 O 2 largely exposed to Cu atom active site (CMH-L) led to a superior ofloxacin (OFX) degradation efficiency of 93% compared with H 2 O 2 middle exposed around the Cu atoms (CMH-M, 84%) and small part exposed around the Cu atoms (CMH-S, 50%). The effect of H 2 O 2 occurrence forms on catalytic activity were confirmed by analyzing their fraction and the relevant rate constant with the correlation was 98%. And the relevant interfacial reaction mechanism was detailed explored based on density functional theory calculation, a series of probe experiments and quantitative analysis of H 2 O 2 utilization efficiency and • OH generation. It revealed that Cu atom arrangement on CuMnO 2 can induce the different H 2 O 2 occurrence form, and compared with CMH-M especially CMH-S (1.486 and 1.591 Å), CMH-L has the shortest elongation of O-O bond (1.477 vs. 1.468 Å in free H 2 O 2 ) together with the smallest O-H 1 and O-H 2 (0.988, 1.022 Å), which were more likely to decomposition H 2 O 2 into • OH, while it was more likely to inefficient transformation H 2 O 2 into O 2 in CMH-S system. Thus, this work provided a new insight for improving the heterogeneous Fenton catalytic performance via altering the interaction mode of H 2 O 2 and catalyst, which should be the fundamental reason for efficient H 2 O 2 activation into O 2 or • OH.
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RSC Advances
·
2021
·Vol. 11
·期 43
·26502-26508
·
IF 3.361
Meirong Fu,Mingqiang Li,Yingying Zhao,Yunxiang Bai,Xingzhong Fang,Xiaolong Kang,Min Yang,Yanping Wei,Xia Xu
Precious metal nanometric catalysts are widely used in the removal of harmful substances. In the process of synthesis and catalytic reaction, it is particularly important to study green and simple synthesis methods and high catalytic efficiency. In this paper, a green one-step method was used to synthesize the Fe(OH)3/Fe2O3@Au composite catalyst, in which Au was single atom-dispersed. The removal of 4-nitrophenol (4-NP), a typical dangerous chemical widely existing in factory waste gas, waste water and automobile exhaust gas, was catalysed by Fe(OH)3/Fe2O3@Au. The catalytic performance of Fe(OH)3/Fe2O3@Au with different synthesis conditions (different amounts of MES, NaBH4, FeSO4, Au and Pt) on the 4-NP reduction reaction were systematically studied. Finally, the stability and recyclability of Fe(OH)3/Fe2O3@Au composite nanocatalyst were investigated thoroughly.
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Journal of Environmental Sciences
·
2021
·
IF 5.565
Yanqing Zhou,Yili Wang,Shuoxun Dong,Haotian Hao,Junyi Li,Chenyang Liu,Xiaolin Li,Yao Tong
Cationic hydrogels have received great attention to control eutrophication and recycle phosphate. In this study, a type of La(OH) 3 loaded magnetic MAPTAC-based cationic hydrogel (La(OH) 3 @MMCH) was developed as a potential adsorbent for enhanced phosphate removal from aqueous environment. La(OH) 3 @MMCH exhibited high adsorption capacity of 105.72±5.99 mg P/g, and reached equilibrium within 2 hr. La(OH) 3 @MMCH could perform effectively in a wide pH range from 3.0 to 9.0 and in the presence of coexisting ions (including SO 4 2− , Cl − , NO 3 − , HCO 3 − , SiO 4 4− and HA). The adsorption-desorption experiment indicated that La(OH) 3 @MMCH could be easily regenerated by using NaOH-NaCl as the desorption agent, and 73.3% adsorption capacity remained after five cycles. Moreover, La(OH) 3 @MMCH was employed to treat surface water with phosphate concentration of 1.90 mg/L and showed great removal efficiency of 95.21%. Actually, MMCH showed high surface charge density of 34.38-59.38 meq/kg in the pH range from 3.0 to 11.0 and great swelling ratio of 3014.57% within 24 h, indicating that MMCH could produce the enhanced Donnan membrane effect to pre-permeate phosphate. Furthermore, the bifunctional structure of La(OH) 3 @MMCH enabled it to capture phosphate through electrostatic attraction and ligand exchange . All the results prove that La(OH) 3 @MMCH is a promising adsorbent for eutrophication control and phosphate recovery.
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POWDER TECHNOLOGY
·
2021
·
IF 5.134
Chendong Zhang,Hangchen Li,Xinxin Guo,Shunchao Li,Han Zhang,Xuhai Pan,Min Hua
A new type of dry powder fire extinguishing agent was prepared, which was called composite superfine dry powder with Aluminum Trihydrate (CSFP-ATH). The CSFP-ATH was characterized by laser particle size analysis , scanning electron microscope (SEM), thermal gravity analyzer (TGA), transform infrared spectroscopy(FTIR) analyzer and differential scanning calorimetry (DSC). The extinguishing performance of different samples was examined in a small-scale experimental platform for the liquid hydrocarbon fire. The tests were proved that the fire-extinguishing performance was as follows: CSFP-ATH > superfine ABC dry powder(SFP) > commercial ABC dry powder(CDP). Besides, the mechanism, kinetics and thermochemical changes in the reaction process were calculated by Gaussian simulation, and the reaction path of the CSFP-ATH with free radicals in the flame was predicted. Experimental and theoretical studies have been proved that the addition of Al(OH) 3 can promote the fire extinguishing performance of superfine ABC dry powder.
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JOURNAL OF IRON AND STEEL RESEARCH INTERNATIONAL
·
2021
·Vol. 29
·期 7
·1063-1072
·
IF 1.263
Sun Qian,Wang En-hui,Hou Xin-mei,He Zhi-jun,Liang Tong-xiang
Calcium aluminate cement (CAC) is widely used as a binder for refractory materials, and thus the improvement in compressive strength is of vital importance for CAC applied at high temperature. For this purpose, nano-Ca 10 (PO 4 ) 6 (OH) 2 additive with a ratio of 0.5–1.5 mass% was added with the water-cement ratio to be 0.4. X-ray diffraction and isothermal calorimetry analysis demonstrate that nano-Ca 10 (PO 4 ) 6 (OH) 2 additive can shorten the hydration process and promote the formation of main hydrates of CaAl 2 O 4 ·10H 2 O (CAH 10 ) and Ca 2 Al 2 O 5 ·8H 2 O (C 2 AH 8 ). In addition, scanning electron microscopy results suggest that nano-Ca 10 (PO 4 ) 6 (OH) 2 can protect CAH 10 and C 2 AH 8 from being destroyed during the calcination, guaranteeing that these thin lamellar crystals are intertwined to form the denser microstructure. Benefited from above effects, nano-Ca 10 (PO 4 ) 6 (OH) 2 can obviously improve the compressive strength of the CAC mortar samples cured for 7 d after calcination at 1100 °C, while the improving effect is dependent upon its contents. Especially, compared with the one without the additive, the compressive strength of the sample with 1.0% nano-Ca 10 (PO 4 ) 6 (OH) 2 is increased by 14%.
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APPLIED CATALYSIS B-ENVIRONMENTAL
·
2020
·
IF 16.683
Fang Li,Huijie Ma,Chensi Shen,Yuting Pan,Yaopeng Zhang,Yanbiao Liu,Chenye Xu,Deli Wu
Persulfates are the concerned oxidants in the advanced oxidation processes recently. Besides, persulfates with higher concentrations can initiate the free radical crosslinking of the polymeric chain, which is considered as one of the solutions for the pollution control of soluble polymers. In this study, the combination of free radical crosslinking and oxidation initiated by a thermally activated persulfate system was used to simultaneously remove polyvinyl alcohol (PVA) and the coexisting organic pollutants, i.e. dyes. Especially, the catalyst-like function of PVA could accelerate the production of OH radicals via the elimination of −OH groups. It can promote the crosslinking itself and facilitate the degradation of coexisting pollutants. Given initial COD and PVA concentrations of 14406.0 mg/L and 8063.2 mg/L, respectively, a maximum of 93.6 % COD and 98.4 % PVA was removed under the optimal conditions. Meanwhile, the PVA with high concentration did not have negative effects on the degradation of coexisting pollutants.
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JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2021
·
IF 4.464
Jing-He Yang,Xiuhong Xu,Miaomiao Chen,Duo Yang,Hongye Lu,Yazhou Sun,Can Shao,Qiangqiang Song,Jie Zhang,Li Gao,Yatao Zhang
The establishment of non-noble metal electrocatalysts with controllable morphology is crucial significance for overall water splitting. Ni-based catalyst is perceived as a promising electrocatalyst due to its excellent oxygen evolution reaction (OER) and hydrogen evolution reaction (HER) performance. Herein, β-Ni(OH) 2 /NF is designed for OER and HER, using a facile hydrothermal etching method. The separation rate of hydroxide is controlled by the copper-ammonium complexation reaction, and the different amounts of oleic acid is added as a protective agent to regulate the surface morphology of the Ni foam. The ingenious combination of several reactants allows us to synthesize different morphology catalysts, and get the best performance from them. The catalyst exhibits superior OER and HER electrocatalytic performance, which overpotential is 329 mV during the OER and 170 mV for the HER at 50 mA cm −2 . Meanwhile, it demonstrates small Tafel slopes of 51 mV dec −1 for HER and 40 mV dec −1 for OER in 1.0 M KOH solution. Moreover, the catalyst presents a stable activity with no significant attenuation after 24 h OER and HER reaction. The hydrothermal etching method is expected to offer an adjustable synthetic strategy for the reasonable design of highly efficient, durable and non-noble-metal bifunction catalysts.
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CRYSTENGCOMM
·
2020
·Vol. 22
·期 30
·5067-5072
·
IF 3.117
Kuan Deng,Feifei Wang,Wen Tian,Zhufeng Hu,Hualian Zhang,Kui Ma,Caihong Wang,Hairong Yue,Yu Xin Zhang,Junyi Ji
Hierarchical Co-doped SnS2@Ni(OH)2 double-shell nanosheet arrays are coated on carbon cloth via a two-step solvothermal method. The vertically aligned and ultrathin nanosheet arrays with gradient pore distribution and hydrophilic nature can facilitate electrolyte infiltration and avoid the “dead volume,” while the densely-packed SnS2 array with high intrinsic electrical conductivity can bridge carbon cloth and Ni(OH)2 to improve electron transfer. The SnS2@Co–Ni(OH)2/CC-3 electrode can achieve high areal capacitance (5.41 F cm−2 at 1 mA cm−2), good rate capability, and cyclic stability (93.92% capacitance retention after 5000 cycles) in a three-electrode system. Moreover, an asymmetric supercapacitor (ASC) device is fabricated with the help of SnS2@Co–Ni(OH)2/CC composites and activated microwave-exfoliated graphene oxide, which achieves the highest energy density of 57.2 W h kg−1 and a maximum power density of 8.0 kW kg−1.
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JOURNAL OF POWER SOURCES
·
2020
·
IF 8.247
Guichao Liu,Xue-Zhi Song,Shenpeng Zhang,Xi Chen,Sihang Liu,Yulan Meng,Zhenquan Tan
Rational architecture design and ingenious electrochemical performance optimization are highly desirable in developing high-performance asymmetric supercapacitors . Herein, a facile electrodeposition strategy is adopted to construct the hierarchical core-shell architecture of binary transitional metal hydroxide nanosheets anchored on copper foam ( CF) supported three-dimensional (3D) CuO scaffolds. The synergistic contributions from different electro-active components are maximized by the heterostructures construction and components optimization. As a result, the 3D binder-free electrode of CF supported CuO@Zn 1 Co 2 -OH core-shell heterostructure achieve a high areal capacitance of 2.634 F cm −2 at 5 mA cm −2 , enhanced rate performance (71.6% retention at 30 mA cm −2 ), and long durability (99.1% after 4000 cycles). Additionally, a CuO@Zn 1 Co 2 –OH//LSDC (loofah sponge derived carbon) asymmetric supercapacitor (ASC) is assembled with an operating voltage of 1.5 V. The ASC device delivers a maximum energy density of 0.21 mW h cm −2 (22.10 W h kg −1 ) at a power density of 4.08 mW cm −2 (434 W kg −1 ), and exceptional cycling stability (91.7% of capacitance retention after 4000 cycles). Of practical importance, this work broadens our horizons in fabricating novel hierarchical core-shell heterostructures for next-generation electrochemical energy-storage technologies.
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