Chemistry-An Asian Journal
·
2018
·Vol. 13
·期 8
·944-949
·
IF 3.692
Shuai Hao,Ninghua Chen,Qin Liu,Ying Xie,Honggang Fu,Yingchun Yang
Graphical Take a Ni : NiO@Ni-P nanosheet arrays behave as efficient electrocatalyst benefiting from the synergistic effect between NiO and Ni-P. As a durable 3D catalytic electrode for oxygen evolution reaction, NiO@Ni-P/Ti exhibits a high activity achieving a geometrical catalytic current density of 10 mA cm −2 at an overpotential of 292 mV in 1.0 m KOH. Cost-effective and highly-efficient electrocatalysts for the oxygen evolution reaction are crucial for electrolytic hydrogen production. Here, we report core–shell NiO@Ni-P nanosheet arrays as a high-performance 3D catalyst for water oxidation electrocatalysis. Such nanoarrays demand overpotentials of 292 and 350 mV to drive geometrical catalytic current densities of 10 and 100 mA cm −2 , respectively, with an activity superior to its NiO and Ni-P counterparts. Notably, this catalyst also shows a high long-term electrochemical durability with a Faradaic efficiency of 98.1 %. Density functional theory calculation reveals that the superior activity benefits from the synergistic effect between NiO and Ni-P.
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高影响因子
CHINESE JOURNAL OF CHEMICAL ENGINEERING
·
2025
·
IF 3.7
Runze Dong,Wenhao Li,Qiyu Yang,Ping Li,Pan Zhang,Lemeng Wang,Dong Fu
How to achieve low energy consumption and high degradation efficiency (DRE) under mild conditions is an important issue in the field of sulfur hexafluoride (SF 6 ) treatment. In this work, a new route of SF 6 degradation promoted by Ni-doped ceria (NiO-CeO 2 ) in a packed bed dielectric barrier discharge (PB-DBD) was proposed. The effects of Ni/Ce molar ratio, input power, SF 6 concentration and flow rate on the DRE of SF 6 were investigated. Compared with DBD or CeO 2 -DBD alone, the combination of DBD and NiO-CeO 2 can significantly promote the SF 6 degradation at lower input power. The Experimental results show that when the dosage of catalyst 1.5NiO-CeO 2 (Ni/Ce mole ratio is 1.5%) is 5 g, DBD input power is 50 W and SF 6 (1.5% SF 6 /98.5% Ar) flow rate is 100 ml·min −1 , the highest DRE can reach 97.7% and the energy yield can reach 11.5 gSF 6 ·(kWh) −1 . Adjusting the catalyst dosage according to the flux of SF 6 ( e.g., using 10 g catalyst to degrade SF 6 with a concentration of 1.5% and a flow rate of 80 ml·min -1 ), the DRE of nearly 99% can be achieved for a long time, which is crucial for industrial application. The mechanism deduction shows that the rich surface and mesopores of the catalyst are beneficial to the adsorption of SF 6 and intermediates, while the doping of Ni can significantly increase the content of oxygen vacancies to improve the degradation. Meanwhile, when NiO-CeO 2 is activated by DBD, the free O· can further promote the degradation. It is this coupling effect that leads to the high efficiency and low energy consumption of SF 6 degradation under mild conditions. It can be expected that this coupling technology route will have a good application prospect in the field of SF 6 treatment.
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ACS Applied Energy Materials
·
2025
·
IF 5.5
Chen Yuan,Ye Yang,Qiongya Jin,Chengzhang Chen,Qi Cheng,Xinyu Ji,Qing Yang,Weijie Song
The ethylene-vinyl acetate (EVA) copolymer, a popular transparent adhesive interlayer material for solar cell encapsulation, can be formed by a simple extrusion process at a relatively low temperature without the aid of an organic solvent. However, the inherently poor ionic conductivity (σ) restricts its application as a solid polymer electrolyte (SPE) for laminated WO3-NiO electrochromic devices (ECDs). Here, we propose a strategy to improve the σ by a water modification in the EVA matrix. The results demonstrate that the sample treated at 50 °C and 25% relative humidity (RH) for 1 h exhibits a higher σ of 3.80 × 10–4 S cm–1, as well as a visual transmittance of more than 90%, a tensile strength of 1.61 MPa, and an excellent thermal stability up to 219 °C. Using this kind of EVA-based SPE (EVA-SPE) as the interlayer, WO3-NiO based ECDs with sizes varying from 2.5 × 5 to 20 × 20 cm2 have been successfully laminated and exhibit favorable EC performances. Besides, the water modification is conducive to an enlarged light modulation range (ΔT) for the laminated ECD in the near-infrared zone, ensuring a high energy efficiency when the device is used as a smart window in buildings.
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ACS Applied Materials & Interfaces
·
2025
·
IF 8.2
Mingzhe Li,Jiahui Zheng,Fengchun Zheng,Xin Zhang,Yunlong Wang,Kepi Chen,Nian Ran,Wei Zhou,Yuzhen Lv
Developing highly efficient catalysts with ultralow-loading metal is still hindered by the sluggish Volmer–Tafel kinetics for the alkaline hydrogen evolution reaction (HER). Herein, an efficient catalyst was designed and constructed on nickel foam by integrating oxyphilic Y-doped NiO with NiPt1% nanocrystalline via a facile one-step electrodeposition. It requires only 21.2 and 178.5 mV to achieve 10 and 1000 mA cm–2, with a low Tafel slope of 27.8 mV dec–1. Furthermore, it provides an ultrahigh mass activity of 42.7 mA μgpt–1 @ 100 mV and a high stability over 2000 h at 1 A cm–2 almost without potential decay. In-situ experiments and D2O electrolysis tests reveal that the oxyphilic Y-NiO component not only reduces the activation energy of NiPt1% alloy by 32% and enhances its surface hydrogen (*H) coverage 7.8 times but also markedly boosts the Volmer step. Density functional theory calculations further reveal that Y-NiO strengthens water adsorption and shifts both Volmer and Tafel steps on the NiPt1% alloy surface from nonspontaneous to spontaneous, while reducing their energy barriers by 32 and 23%, respectively. This work presents an effective approach for regulating the Volmer–Tafel process in ultralow-loading metal alloys for alkaline HER.
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CERAMICS INTERNATIONAL
·
2025
·Vol. 51
·期 26
·51205-51213
·
IF 5.6
Chao Fan,Zijiang Yang,YiMing Yao,Cheng Tao,Rui Huang,Hua Hao,Zhonghua Yao,Hanxing Liu,Minghe Cao
The ternary transition metal oxide 40FeO-40NiO-20ZnO ((FNZ)O) was coated on the surface of BaTiO 3 (BT) powder to prepare (FNZ)O@ BT ceramics powder with uniform core-shell structure. The (FNZ)O coating effectively inhibits grain growth during the sintering process, reducing the grain size from 30 μm in pure BT ceramics to an ultra-fine grain size of 197 nm with uniform grain distribution. XRD analysis showed that the crystal structure of the ceramics gradually changed from tetragonal phase to cubic phase with the increase of the (FNZ)O. Under the electric field of 225 kV/cm, the highest discharge energy density (W d ) of 1 wt%(FNZ)O@ BT ceramic is 1.49 J/cm 3 , and the energy storage efficiency(η) is 71.3 %. The dielectric properties of (FNZ)O@ BT ceramics meet the X7R standard, it shows good temperature stability. In addition, 1 wt%(FNZ)O@BT ceramics also have very good high cycle stability (up to 10 5 cycles) and fast charge and discharge characteristics (τ 0.9 <0.75 μs). In this study, the core-shell structure prepared by coating ternary transition metal oxides opens up a way for the preparation of new functional materials.
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CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Shuai-Yu Wu,Kai-Zhen Yuan,Xiao-Feng Xu,Zhao-Jian Li,Zhen Zhang,Peng Wang,Yun-Ze Long,Hong-Di Zhang
Vacancy engineering is a highly efficient approach to enhancing photocatalytic activity. This research presents an innovative development of ZnO/NiO coaxial heterojunction nanofibers (ZN 1/1 ) and ZnO/NiO coaxial heterojunction nanofibers with engineered oxygen vacancies (OVs-ZN 1/1 ) via electrospinning and annealing. Detailed characterization of the nanofiber microstructure was conducted using scanning electron microscopy, transmission electron microscopy, and X-ray photoelectron spectroscopy. The OVs-ZN 1/1 nanofibers demonstrated outstanding and unprecedented photocatalytic performance, achieving a 99 % degradation rate of Congo red dye (CR) under simulated solar light in just 45 min, with a good degradation coefficient of 0.091 min −1 . Remarkably, the nanofibers’ photocatalytic activity remained a high level even after five cycles. Moreover, the photocatalytic H 2 O 2 yield of OVs-ZN 1/1 increased 20 times as much as that of ZN 1/1 . Experiments and mechanism analysis indicate that oxygen vacancy, as the electron trapping site of photoexcitation, accelerates the charge separation and transfer at the interface, thus promoting the adsorption and activation of target molecules. This study highlights the novel and superior performance of photochemical catalysts achieved through the strategic incorporation of oxygen vacancies and heterojunctions.
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JOURNAL OF THE ELECTROCHEMICAL SOCIETY
·
2020
·Vol. 167
·期 6
·066520
·
IF 3.721
Ying Liu,Minjun Huang,Jiping Zhao,Ming Lu,Xinli Zhou,Qiuhan Lin,Pengcheng Wang,Jie Zhu
The development of exceptionally active and stable electrocatalysts for the urea oxidation reaction (UOR) is a current research topic of interest. In this work, NiO/NiCr2O4 nanocomposites with different CrNi ratios (denoted as NiO/NiCr2O4-m, m = 1, 2, 3) were synthesized by a facile one-pot hydrothermal mothed without any template followed by a thermal treatment in N2 at 600 °C. The NiO/NiCr2O4-2 catalyst exhibited a large electrochemical surface area, which provided numerous accessible active sites and electronic transmission channels for the UOR. At a low catalyst loading of 50 μg cm–2, NiO/NiCr2O4-2 electrode delivered a current density of 994 mA cm−2 mg−1 (49.7 mA cm−2) in an electrolyte of 1.0 M KOH with 0.33 M urea at the potential of +0.5 V vs Ag/AgCl. The catalyst showed excellent redox characteristics and better stability compared to catalysts with other ratios of NiO/NiCr2O4, pure NiO and NiCr2O4 prepared similarly. Benefiting from the synergistic effect of NiO and NiCr2O4, multicomponent catalysts, particularly NiO/NiCr2O4-2, have demonstrated excellent electrocatalytic activities and are considered as promising candidates for direct urea fuel cells.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2017
·
IF 3.133
Yuanfeng Wu,Xianghai Song,Fufeng Cai,Guomin Xiao
A series of Ce-NiO catalysts prepared by co-precipitation method were tested for glycerol transesterification with diethyl carbonate (DEC) to produce glycerol carbonate (GC). The microstructural and physicochemical properties of the catalysts were determined by XRD , XPS , SEM, EDX, CO 2 -TPD, N 2 -adsorption, FT-IR, and TG-DTG. The results showed that the particle size (100–350 nm) of the Ce-NiO was smaller than that of pure NiO (400–900 nm), suggesting addition of Ce in the catalyst synthesis could lessen the aggregation or facilitate the dispersion of NiO particles. The highest catalyst activity was observed over the Ce-NiO catalyst with Ce/Ni atomic ratio of 0.2 and calcined at 400 °C. 94.14% of glycerol conversion and 90.95% selectivity to GC were obtained over this catalyst under the optimum conditions (5 wt.% catalyst of glycerol, 85 °C, 8 h, glycerol/DEC ratio of 1:3). This catalyst can be reused up to three cycles with a slight decrease in its catalytic activity. It was found the well dispersed NiO particles and the strong basic sites derived from the substitution of Ce 4+ by Ni 2+ in the CeO 2 lattices synergistically promoted the glycerol conversion.
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RSC Advances
·
2015
·Vol. 5
·期 123
·101487-101493
·
IF 3.84
Xin Zhang,Yongzhe Zhang,Bowen Zhao,Shujuan Lu,Hao Wang,Jingbing Liu,Hui Yan
Among the explored materials for electrochromic devices (ECDs), nickel oxide thin films have been widely applied as an optical anodic layer due to its ability to adjust the optical properties by ion exchange. Generally, to realize the three important characters including color contrast, switch speed and cycling durability, it requires the electrochromic layer to possess different microstructures or crystalline properties. Thus there is still difficulty in designing a suitable structure for NiO film to have excellent electrochromic performance. Here, a nanocrystalline modified nanocomb novel NiO structure is prepared by a simple chemical process. This novel microstructure shows highly multiple channels, high surface areas and good crystallinity. All of these characters produce a good electrochromic performance including fast switch speed (around 2 s), high color contrast (69.4%) and in company with good cycling durability (more than 1000 cycles). This simple chemical process demonstrated here could be suitable for the large scale production of future electrochromic device applications.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2025
·
IF 9.7
Yaolin Hou,Jolla Kullgren,Lei Han,Pengyuan Qian,Wei Yuan,Jia Liu,Haiming Xie,Jiefang Zhu
Lithium-sulfur (Li-S) batteries, renowned for their exceptional theoretical energy density, are positioned as a leading candidate for future energy storage systems, offering a potential pathway to overcome the energy density limitations of conventional lithium-ion batteries. Nevertheless, the notorious lithium polysulfides (LiPSs) shuttle effect and sluggish redox kinetics hinder their practical application. To resolve these challenges, we report a novel NiO-Ni 2 P/C 3 N 4 heterostructure synthesized via an in-situ phosphation process. Herein, we present an in situ phosphorylation strategy for the construction of NiO-Ni 2 P heterojunctions anchored on a conductive C 3 N 4 substrate (NiO-Ni 2 P/C 3 N 4 ) for further integration into commercial polypropylene (PP) separator (denoted as NiO-Ni 2 P/C 3 N 4 @PP). Mechanistic studies demonstrated that the NiO phase facilitated strong chemisorption of LiPSs, while the Ni 2 P component reduced the energy barrier for Li 2 S dissolution through optimised d-band electron transfer. Concurrently, the C 3 N 4 framework enhanced the interfacial charge transfer and significantly reduced the charge transfer resistance. Benefiting from the synergistic “adsorption-transformation-conduction” triple-function, the cells with the NiO-Ni 2 P/C 3 N 4 @PP separator exhibit remarkable cycling stability (over 300 cycles at 3C) and outstanding rate capability (82.5 % capacity retention after 200 cycles at 5C). This work provides atomic-level insights into the engineering of multi-step sulfur electrochemical heterostructures, providing a generic design paradigm for high-energy metal-sulfur batteries.
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RSC Advances
·
2018
·Vol. 8
·期 7
·3357-3363
·
IF 2.936
Hongyu Dong,Panpan Tang,Shiquan Zhang,Xinglu Xiao,Cheng Jin,Yicong Gao,Yanhong Yin,Bing Li,Shuting Yang
A layered nanosphere structured NiO catalyst was successfully synthesized by a simple and efficient hydrothermal method as a cathode material for lithium–oxygen (Li–O2) batteries. Cyclic voltammetry (CV), dual electrode voltammetry (DECV) and chronoamperometry (CA) by rotating ring-disk electrode (RRDE) were carried out to investigate the catalytic activity of this catalyst for the oxygen evolution reaction (OER). The results revealed that the layered nanosphere NiO exhibited excellent electrochemical performance, stability and a typical four-electron reaction as a cathode electrocatalyst for rechargeable nonaqueous Li–O2 batteries. The overpotential of the NiO is only up to 0.61 V. X-ray photoelectron spectroscopy (XPS) characterization shows that the Li2O2 and Li2CO3 formed during the discharge process and decomposed after charging. Moreover, the cut-off voltage of discharging is about 2.0 V in the NiO-based Li–O2 batteries, while the specific capacity is up to 3040 mA h g−1. There is no obvious performance decline of the battery after 50 cycles at a current density of 0.1 mA cm−2 with a superior limited specific capacity of 800 mA h g−1. Herein, the layered nanosphere structured NiO catalyst is considered a promising cathode electrocatalyst for Li–O2 batteries.
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JOURNAL OF CATALYSIS
·
2018
·
IF 6.759
Na Tong,Ying Wang,Yang Liu,Minbo Li,Zizhong Zhang,Huijuan Huang,Tao Sun,Jinxiang Yang,Fuying Li,Xuxu Wang
Photocatalytic ammonia synthesis is of great importance but remains very challenging in photocatalysis. Here, we fabricated a photocatalytic reaction system for the efficiently photocatalytic nitrate reduction to ammonia under UV irradiation using PdSn/NiO/NaTaO 3 :La as a photocatalyst in the presence of formic acid. Several important factors of the photocatalytic performance were investigated, including initial concentration of the nitrate solution, initial pH value and cocatalyst loadings. Nitrate conversion reaches 100% and ammonia selectivity is 72% over the optimum photocatalyst with 5% bimetallic PdSn alloy and 0.2% NiO loadings. The outstanding performance of photocatalyst can be ascribed to both the strong adsorption of nitrite on NiO and the efficient separation of electron-hole pairs by PdSn bimetallic alloy. Besides as the hole scavenger, formic acid also provides not only carboxyl anion radicals for nitrate reduction but also the in-situ buffer effect on ammonia formation. These results give inspiration for designing the reactive system with efficient photocatalytic ammonia synthesis.
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