Journal of Energy Chemistry
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2021
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IF 9.676
Zhiguo Zhang,Hua Huo,Zhenjiang Yu,Lizhi Xiang,Bingxing Xie,Chunyu Du,Jiajun Wang,Geping Yin
Mn doping is deemed as a promising strategy to improve the electrochemical performance of the α-Ni(OH) 2 battery-type supercapacitor electrode. However, the internal structure evolution, the pathways and the dynamics of the proton/intercalated anion migration, as well as the functioning mechanism of Mn dopant to stabilize the layered structure during cycles remain unclear. Here, we unveil that irreversible oxidization of Mn 3+ at the initial CV cycles, which will remain as Mn 4+ in the NiO 2 slabs after the first oxidization to effectively suppress the phase transformation from α-Ni(OH) 2 /γ-NiOOH to β-Ni(OH) 2 /β-NiOOH and further maintain the structural integrity of electrode. With a synergistic combination of theoretical calculations and various structural probes including XRD and 2 H MAS solid state NMR, we decode the structure evolution and dynamics in the initial CV (cyclic voltammetry) cycles, including the absorption/desorption of hydrogen containing species, migration of intercalated anions/water molecules and the change of interlayer space. This present work elucidates a close relationship between doping chemistry and structural reliability, paving a novel way of reengineering supercapacitor electrode materials.
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高影响因子
NEW JOURNAL OF CHEMISTRY
·
2021
·Vol. 45
·期 36
·16705-16713
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IF 3.591
Xue Meng,Li Yan,Maobin Wei,Tao Wang,Ting Xu,Yongsheng Yan,Shihan Cheng
The developed peroxydisulfate (PDS) activation for removing pollutants is a significant technology. Here, a Co(OH)2/Cu2O composite was synthesized and used to activate PDS for tetracycline (TC) degradation. Covering the surface of Cu2O with Co(OH)2 could improve the stability of the material, reactive active sites, and electron transfer efficiency of the catalyst. Thus, Co(OH)2/Cu2O composite exhibited excellent performance in terms of degrading the TC pollutant, and in the Co(OH)2/Cu2O/PDS system, the removal rate of TC could reach 98% within 30 min. Moreover, the effect of pH value, PDS dosage, and TC concentration on the degradation efficiency of TC was systematically studied. According to free radical quenching experiments, the possible mechanism of TC degradation over the Co(OH)2/Cu2O/PDS system was proposed. This work provided a research basis for the use of metal oxides for PDS activation in environmental treatment.
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ChemSusChem
·
2021
·Vol. 14
·期 14
·2935-2942
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IF 8.928
Jifang Zhang,Wanbing Gong,Huajie Yin,Dongdong Wang,Yunxia Zhang,Haimin Zhang,Guozhong Wang,Huijun Zhao
Graphical Keep it 100 : A facile immersion approach has been developed to grow ultrathin nickel hydroxide nanosheets, which show excellent performance as the anode for electrocatalytic oxidation of 5-hydroxymethylfurfural to 2,5-furandicarboxylic acid with 100 % yield and essentially 100 % faradaic efficiency under a low potential within a short reaction time. Development of electrocatalysts that are capable of efficiently oxidizing biomass-derived 5-hydroxymethylfurfural (HMF) into 2,5-furandicarboxylic acid (FDCA) is critically important for production of degradable plastics via non-fossil routes. In this study, a facile and scalable immersion synthetic approach has been developed to grow ultrathin nickel hydroxide nanosheets in situ on commercial nickel foam (Ni(OH) 2 /NF) as an anode for the electrocatalytic oxidation of HMF to FDCA with complete HMF conversion, 100 % FDCA yield, and >99 % faradaic efficiency at 1.39 V (vs. RHE) within 90 min. Mechanistic studies reveal that the initial oxidation of HMF takes place at the carbonyl group and FDCA is generated through two further oxidation steps. Impressively, the synthesized Ni(OH) 2 /NF can also be used to electrocatalytically oxidize other alcohol/aldehyde-containing compounds to the targeted products in alkaline medium with 100 % yield and >94 % faradaic efficiency under a low oxidation potential of 1.39 V (vs. RHE) within short reaction times.
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高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2021
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IF 8.128
Bo Lv,Xuefan Feng,Xiaoping Xi,Xinyan Feng,Zhenyu Yuan,Yu Yang,Fuqin Zhang
Heterogeneously structured materials with supported precious metals , such as Pd, Pt, and Ru, as co-catalysts are important catalysts for efficient photocatalytic water splitting. However, the high costs and low reserves of precious metals have been an obstacle to their application in hydrogen production . In this work, the noble-metal-free Cd 0.3 Zn 0.7 S solid solution was designed and synthesized with an optimized molar ratio of Cd/Zn for the best visible light photocatalytic performance. In addition, a heterojunction hybrid material formed between the Cd 0.3 Zn 0.7 S and Ni(OH) 2 nanosheet was engineered to improve the utilization of light and to inhibit the recombination of holes and electrons. Ni(OH) 2 nanosheets assisted the transfer of the photoexcited electrons to participate in the reduction reactions which is critical for efficient and rapid catalytic hydrogen production. The photoelectrochemical property of the hybrid material was investigated with UV–vis absorption, photoluminance (PL) and electrochemical impedance spectroscopy measurements. The mechanism of the high-efficiency and low-cost photocatalytic hydrogen production was established by analyzing the hydrogen evolution kinetics. With the success of replacing precious metal with nickel-based surface heterostructure, this work is expected to provide a new type of photocatalyst for the application of photocatalytic hydrogen production.
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JOURNAL OF CLUSTER SCIENCE
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2020
·Vol. 32
·期 5
·1371-1379
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IF 1.731
Zhang Yingzhen,Song Yingying,Li Yancai
A simple and environment-friendly autocatalytic reduction process was developed for synthesis of Au/Ni(OH) 2 nanocomposites. The nanocomposites were characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS). It is found the nanocomposites are composed of ultrathin Ni(OH) 2 nanosheets and gold nanoparticles (AuNPs), and the AuNPs disperse evenly on the Ni(OH) 2 nanosheets. The electrochemical and electrocatalytic properties of the Au/Ni(OH) 2 modified glassy carbon electrode (Au/Ni(OH) 2 /GCE) were investigated by electrochemical experiments. Furthermore, through optimizing Au loading of the nanocomposites, the 5%-Au/Ni(OH) 2 /GCE displays the best electrocatalytic activity towards glucose oxidization in alkaline medium. Under optimal conditions, the 5%-Au/Ni(OH) 2 /GCE displays a wide linear range of 0.01 to 3.15 mM (R 2 = 0.998) to glucose. Besides, the sensor has a low detection limit of 0.10 μM (S/N = 3) and a high sensitivity of 342.1 μA·mM −1 ·cm −2 . It also displays satisfying stability, good reproducibility and selectivity.
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APPLIED SURFACE SCIENCE
·
2020
·
IF 6.182
Yinli Duan,Jing Ma,Jianan Dai,Liangsheng Qiang,Juanqin Xue
Very efficient and low-cost photocatalysts containing Indium hydroxide (In(OH) 3 ) anchored on zinc oxide (ZnO) with various morphologies (e.g., hexagonal, pyramids, elliptic, etc.) were synthesized using a hydrothermal approach. The strong interaction between In(OH) 3 and ZnO was investigated using X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), N 2 adsorption-desorption, UV–vis diffuse reflectance spectroscopy (UV–vis DRS), and X-ray photoelectron spectroscopy (XPS). In(OH) 3 particles grew directly on the ZnO surface and strongly interacted with it, which contributed to the excellent photocatalytic performance of ZnO. A possible formation mechanism of the In(OH) 3 /ZnO nanostructures was proposed. Experiments on photodegradation of methylene blue (MB) showed that the photocatalytic activity of the In(OH) 3 /ZnO nanocomposites correlated with the material morphology. The highest MB removal efficiency by the In(OH) 3 /ZnO hybrid photocatalysts was 90.5% after 120 min exposure to the visible light. The significant improvement of photocatalytic activity of In(OH) 3 /ZnO hybrid can be attributed to their special structural features, which allowed for an extended spectral response as well as for enhanced separation of photogenerated charge carriers. The design principles of this hybrid material apply to other metal-oxide systems to widen variety of advanced material systems with multifunctional properties useful for sensing and other advanced applications.
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NEW JOURNAL OF CHEMISTRY
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2020
·Vol. 45
·期 1
·358-364
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IF 3.288
Yin-chuan Wang,Zi-chen Wang,Gui-yong Xiao,Wei-li Xu,Kai Wang,Yan Jiao,Mei-li Qi,Yu-peng Lu
An oleic acid-assisted solvothermal method has been utilized to prepare hydroxyapatite (HA) nanofibers with a high flexibility and aspect ratio. Understanding the role of oleic acid in the synthesis of HA may provide effective routes for the design of advanced biomaterials. The concentration of OH− ions ([OH−]) has a great impact on the reaction system, which in turn affects the nucleation and crystal growth of HA. In this work, the effect of oleic acid on the morphology and structure of the as-prepared products under different concentrations of NaOH was investigated by XRD, FTIR and FE-SEM. The formation process of HA was also explored to better explain the role of oleic acid based on structured characteristics and morphology evolution. These results showed that oleic acid molecules absorbed on the surface of HA would effectively induce a one-dimensional crystal growth, even if the crystal growth habit had been changed under different [OH−]. For [OH−] < 1.50 M, [OH−]-responsive oleic acid and its corresponding behavior as a pH buffer can regulate pH at a relatively constant value. Besides, the flexible ultralong HA nanofibers can be formed at [OH−] = 1.25–1.50 M, while the crystallite size and preferred growth along the c-axis were both improved with an increase in [OH−] added.
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APPLIED SURFACE SCIENCE
·
2020
·
IF 6.182
Lingjiao Li,Jing Xu,Binyi Su
In the field of photocatalysis, most of the photocatalysts are semiconductors. Recent years, there have been many photocatalytic systems related to non-semiconductor catalysts. In this paper, a photocatalytic hydrogen evolution system of hexagonal Ni(OH) 2 derived from CuNi bimetal is obtained by classical hydrothermal method. The derived hexagonal Ni(OH) 2 can promote the separation of photogenerated electron-hole pairs and greatly improve the effect of photocatalytic hydrogen evolution. The electron-hole pair comes from the surface plasmon resonance (SPR) effect of Cu from CuNi composite. It is worth noting that photoluminescence spectra and photoelectrochemical experiments have confirmed that the CuNi-5 complex can effectively improve space charge separation. The results of linear scanning voltammetry show that the material has high current response characteristics. This system gives a practical solution for planning and synthesizing non-semiconductor catalysts with high photocatalytic activity.
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高影响因子
APPLIED ENERGY
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2020
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IF 8.848
J. Yan,Z.H. Pan,C.Y. Zhao
Thermochemical heat storage uses a reversible chemical reaction to store thermal energy. This thermal energy storage method has high energy density and allows long-term thermal energy storage. MgO/Mg(OH) 2 is a promising reversible reaction for thermochemical heat storage systems. The performance of this reversible reaction inside a reactor plays a key role in its practical applications. The direct type heat transfer reactor is a novel design compared with an indirect powder bed reactor. It allows the gaseous heat transfer fluid to flow through the powder in order to break the heat transfer limitation from the heat exchanger between the MgO/Mg(OH) 2 powder and the heat transfer fluid. In this study, we evaluated the performance of a direct type MgO/Mg(OH) 2 reactor under various operating conditions. Parametric analyses indicated that the heat output is limited by the reaction rate rather than the heat transfer efficiency. Results also showed the best bed thickness in order to achieve the highest temperature output. Material characterization indicated that the MgO/Mg(OH) 2 particles did not agglomerate with each other after 15 heat charging and discharging cycles.
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CHEMOSPHERE
·
2021
·
IF 7.086
Fang Zhu,Siyi Zhou,Mengying Sun,Jianfeng Ma,Wei Zhang,Kunjie Li,Hao Cheng,Sridhar Komarneni
Mg doped Ni(OH) 2 was synthesized and investigated as an efficient material to activate persulfate (PS) for phenol degradation. The property of the Ni(OH) 2 material was enhanced by Mg doping as the removal efficiency of phenol was increased from 74.82 % in Ni(OH) 2 /PS system to 89.53 % in Mg-doped Ni(OH) 2 /PS system within 20 min. Such a high removal efficiency revealed that doping Mg into Ni(OH) 2 brings about more defects (oxygen vacancies), which facilitated the formation of more active species in the degradation process. The removal efficiencies of phenol increased with the increase of the initial pH from 3 to 11. The influences of Cl − , NO 3 − and HCO 3 − on the stability of the system were also studied and the results showed that removal rates of all systems in the presence of these different inorganic anions could reached about 90 % within 20 min. Based on the electron spin resonance (ESR) experiments, 1 O 2 , O 2 ·- , ·OH and SO 4 •− were identified as the active species in Mg-doped Ni(OH) 2 /PS system for phenol degradation and a degradation mechanism was proposed for this system. In addition, the as-prepared material retained its activation performance even after 3 repeated cycles.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Zepeng Rao,Guanhong Lu,Lu Chen,Asad Mahmood,Gansheng Shi,Zixia Tang,Xiaofeng Xie,Jing Sun
To identify the distinctive role of reactive oxygen species (ROS) and trace the intermediates not only help to decompose the pollutants in high efficiency but also for avoiding more harmful intermediates formed. Here, we developed a new method to generate different ROSs by controlling the atmosphere to distinguish their role in the degradation of flowing gas-phase VOCs, including o -xylene, styrene, and acetaldehyde. This method is in good agreement with the traditional sacrificial agent capture experiment. The results show that • OH radicals play a dominant role in the degradation of o -xylene and styrene, while • O 2 − radicals primarily take part in the acetaldehyde degradation. Additionally, we distinguish the role of holes, • OH and • O 2 − played during the VOCs photo-oxidation through the radical trapping, in situ DRIFTS, and GC-MS analysis. Under the attack of • O 2 − radicals, aromatic VOCs were photo-oxidized to intermediates containing benzene rings and ketones (i.e., toluene and butanone), while carbon chain compounds (i.e., 3-methylfuran and ethanol) tend to form under the action of • OH and holes. This can be associated with the different reaction paths initiated by ROS. For acetaldehyde removal, •O 2 − species facilitate the formation of acids (i.e., acetic acid) while the •OH species and holes lead to the production of ketones (i.e., acetone). This work provides deep understanding on the role of various ROS in the photocatalytic oxidation of VOCs, which can guide the design of efficient photocatalysts, selective formation of intermediates to be easily decomposed or as raw materials for further application.
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SENSORS
·
2019
·Vol. 19
·期 22
·5055
·
IF 3.031
Min Jiang,Peng Sun,Jie Zhao,Lihua Huo,Guofeng Cui
Flexible physiological medical devices have gradually spread to the lives of people, especially the elderly. Here, a flexible integrated sensor based on Au nanoparticle modified copper hydroxide nanograss arrays on flexible carbon fiber cloth ([email protected](OH)2/CFC) is fabricated by a facile electrochemical method. The sensor possesses ultrahigh sensitivity of 7.35 mA mM−1cm−2in the linear concentration range of 0.10 to 3.30 mM and an ultralow detection limit down to 26.97 nM. The fantastic sensing properties can be ascribed to the collective effect of the superior electrochemical catalytic activity of nanograss arrays with dramatically enhanced electrochemically active surface area as well as mass transfer ability when modified with Au and intimate contact between the active material ([email protected](OH)2) and current collector (CFC), concurrently supplying good conductivity for electron/ion transport during glucose biosensing. Furthermore, the device also exhibits excellent anti-interference and stability for glucose detection. Owing to the distinguished performances, the novel sensor shows extreme reliability for practical glucose testing in human serum and juice samples. Significantly, these unique properties and the soft structure of silk fabric can provide a promising structure design for a flexible micro-device and a great potential material candidate of electrochemical glucose sensor.Keywords:Cu(OH)2nanograss;Au nanoparticles;glucose detection;flexible electrochemical biosensor
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