ELECTROCHIMICA ACTA
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2020
·
IF 6.215
Weili Li,Zhongxin Song,Xiaohui Deng,Xian-Zhu Fu,Jing-Li Luo
High-performance and low-cost electrocatalysts for electrochemical methanol oxidation reaction (MOR) are essential for the wide application of direct methanol fuel cells (DMFC). Herein, CeO 2 –NiO composites with CeO 2 nanoparticles homogeneously supported on the surface of NiO hollow spheres composed of stacked nanosheets are synthesized via a facile two-step route and tested as noble-metal-free electrocatalysts towards methanol oxidation in alkaline solution. Optimal loading of CeO 2 nanoparticles with a uniform size of ∼8 nm greatly enhances the electrocatalytic activity and stability comparing with pristine NiO hollow spheres for MOR. It is proposed that a synergistic effect resulting from the proper loading content and high dispersion of CeO 2 nanoparticles on the surface of NiO nanosheets boosted the formation of active NiOOH species, which enhanced the electrocatalytic activity and stability of CeO 2 –NiO catslysts for MOR. CeO 2 nanoparticles exhibit good promotion effect as co-catalyst in electrocatalysis , and CeO 2 –NiO nanocomposites show potential as inexpensive anode catalysts for DMFC applications .
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高影响因子
Nanoscale
·
2020
·Vol. 12
·期 27
·14615-14625
·
IF 6.895
Yaru Bian,Hao Wang,Zhi Gao,Jintang Hu,Dong Liu,Liming Dai
Trifunctional electrocatalysts for the oxygen reduction reaction (ORR), oxygen evolution reaction (OER) and hydrogen evolution reaction (HER) are crucial for many electrochemical devices. Herein, novel trifunctional electrocatalysts of a hierarchically-structured Pt/NiO/Ni/CNT with ultrasmall Pt nanoparticles (∼2 nm) were synthesized via substrate-enhanced electroless deposition. The resulting catalysts exhibited a higher ORR activity (half-wave potential at 0.942 V) than that of the benchmark commercial Pt/C (20 wt%) and a similar OER activity (overpotential of 350 mV at 10 mA cm−2) to that of RuO2 in alkaline media. Moreover, the newly-developed Pt/NiO/Ni/CNT catalysts also showed a high mass activity superior to Pt/C towards the HER in both acid and alkaline electrolytes. The Pt/NiO/Ni/CNT catalysts, when used for overall water splitting, self-powered by two Zn–air batteries with the Pt/NiO/Ni/CNT air electrodes connected into series, displayed superb performance with 1.61 V at 10 mA cm−2. This work represents a breakthrough in the development of facile approaches to trifunctional catalysts from low-cost Earth-abundant materials for efficient energy conversion and storage.
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高影响因子
Science Bulletin
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2019
·
IF 6.277
Deqing Zhang,Yingfei Xiong,Junye Cheng,Jixing Chai,Tingting Liu,Xuewei Ba,Sana Ullah,Guangping Zheng,Ming Yan,Maosheng Cao
WS 2 nanomaterials have attracted great attention in the field of electromagnetic wave absorption due to their high specific surface area, layered structure, and peculiar electronic properties. However, further improvements on their limited electromagnetic absorbing (EMA) capacity and bandwidth are urgently required for their practical application as EMA absorbents. In this work, WS 2 /NiO hybrids with heterostructures are prepared by a hydrothermal method and developed into EMA absorbents. The maximum reflection loss of the hybrids with 20% NiO loading could reach −53.31 dB at a thickness of 4.30 mm; the bandwidth with a reflection loss value of less than −10 dB is determined to be 13.46 GHz (4.54–18 GHz) when the thickness of the absorbent is between 3.5 and 5.5 mm. It is found that the enhanced EMA performance of WS 2 /NiO hybrids is caused by the addition of magnetic NiO, which could result in the interfaces between WS 2 and NiO being responsible for the synergetic magnetic loss and dielectric loss in the hybrids. This work provides a new approach for the design of excellent EMA materials for practical applications.
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高影响因子
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
·
2019
·Vol. 166
·期 16
·A3972
·
IF 3.12
Yayun Zheng,Xiaodong Zhang,Yunrui Tian,Huaiping Zhang,Qingping Guo,Yaodong Zhang,Jujie Luo,Ziyan Li
MnO2 nanoparticles were rapidly grown on a carbon fiber cloth (CFC) substrate via microwave solid-state synthesis and used as an electrode material to improve the cycling stability of NiO battery-type supercapacitors. The morphology and electrochemical properties of NiO@CFC and NiO/MnO2@CFC composites were characterised, and the electrochemical properties of the electrode materials prepared under different feeding qualities and microwave conditions were compared. NiO/MnO2@CFC showed a high specific capacitance of 188.3 mAh/g at a current density of 1 A/g and excellent cycling stability (capacity retention of 88.4% after 2000 cycles); these results indicate that the MnO2 nanoparticles improve the cycling stability of CFC-supported NiO supercapacitors (37.8% capacitance loss after 1000 cycles). An asymmetric NiO/MnO2@CFC supercapacitor revealed a competitive energy density of 20.87 Wh/kg at a power density of 850 W/kg. The successful design and synthesis of these composites via the microwave-assisted solid-state method provides a novel strategy for preparing electrode materials for high-performance energy storage devices.
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Journal of Physical Chemistry C
·
2019
·
IF 4.309
Hongyun Dai,Ran Zhang,Min Zhong,Shouwu Guo
As anode materials for lithium-ion batteries, transition metal oxides show usually high theoretic specific lithium ion storage capacities, but their electrical conductivity remains to be improved and their structural pulverizations during lithiation/delithiation need to be suppressed, which affect severely their lithiation/delithiation rate capability and also the cycling stability. Herein, NiO/Co3O4 nanotubes encapsulated with graphene sheets are designed and assembled. It is demonstrated that as anode for lithium-ion batteries, the as-obtained NiO/Co3O4 nanotubes encapsulated with graphene show excellent electrochemical performance, including large lithium ion storage capability (∼1206 mA h g–1 at 0.1 A g–1 after 100 cycles), high rate capability, and cycling stability. The electrochemical kinetics analyses reveal that the tubular structure not only facilitates lithium ion transportation, but also provides even more spaces for lithium ion storage. The external encapsulated graphene sheets can improve the electrical conductivity of NiO/Co3O4 nanotubes, and afford also certain lithium ion storage capacity. Those structural and component factors synergistically account for their improved electrochemical performances.
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SOLAR ENERGY MATERIALS AND SOLAR CELLS
·
2019
·
IF 6.019
Jianbo Pan,Rongzong Zheng,Yi Wang,Xingke Ye,Zhongquan Wan,Chunyang Jia,Xiaolong Weng,Jianliang Xie,Longjiang Deng
Functions of electrochromism and energy exchange can be achieved by redox reactions , which indicate designing a bi-functional electrochromic energy storage device (EESD) is feasible. In this paper, a NiO/PB composite nanosheet electrode was prepared via loading Prussian blue (iron (Ⅲ) hexacyanoferrate (Ⅱ), PB) nanoparticles on the surface of NiO nanosheets, meanwhile, a high-performance WO 3 negative electrode was also prepared via novel erythritol-assisted hydrothermal method with NH 4 Cl used as capping agent. The designed EESD exhibited properties of large optical modulation (67.6% at 630 nm), high coloration efficiency (109.6 cm 2 C -1 ), fast switching speed (2.8/7.9 s for bleaching/coloration) and long cycle life (ΔT remaining was 84.1% after 4000 cycles). Meanwhile, the EESD also obtained attractive energy storage properties at a potential window from 0 to +1.3 V. Impressively, the EESD exhibited a high areal capacitance of 11.50 mF cm -2 at current density of 0.05 mA cm -2 and the process of charging/discharging can be repeated at least 4000 cycles with a little decay. Therefore, the bi-functional EESD exhibits high promising application prospect.
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JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
·
2023
·
IF 10.9
Tianming Jia,Yanling Hao,Xiaosi Qi,Yongchao Rao,Lei Wang,Junfei Ding,Yunpeng Qu,Wei Zhong
It is well recognized that interfacial effect and/or impedance matching play a great impact on microwave absorption. Herein, we proposed a facile strategy to take full advantage of interface engineering and impedance matching for boosting microwave absorption performance (MAPs). Three-dimensional (3D) hierarchical urchin-like core@shell structured NiO/Ni@CNTs multicomponent nanocomposites (MCNCs) were elaborately constructed and produced in high efficiency through a facile continuous chemical bath deposition, thermal treatment, and catalytic chemical vapor decomposition process. By controlling the pyrolysis time, the NiO/Ni@CNTs urchin-like MCNCs with different lengths and aggregation degrees of CNTs could be selectively synthesized. The obtained results revealed that the enhanced CNT contents provided abundant interfaces and effectively aggrandized their interfacial effects, which resulted in improved polarization loss, conductivity loss, and comprehensive MAPs. Impressively, the interfaces and impedance matching in the designed NiO/Ni@CNTs urchin-like MCNCs could be optimized by regulating the pyrolysis temperature, which further improved the comprehensive MAPs. And the designed NiO/Ni@CNTs urchin-like MCNCs could simultaneously display strong absorption capabilities, broad absorption bandwidths, and thin matching thicknesses. Therefore, our findings not only provided a simple and universal approach to produce core@shell structured magnetic carbon-based urchin-like MCNCs but also presented an interface engineering and impedance matching strategy to develop the tunable, strong absorption, broadband, lightweight high-efficiency microwave absorbers.
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Energy & Environmental Materials
·
2023
·
IF 15
Kejun Xu,Liuying Wang,Chaoqun Ge,Long Wang,Bin Wang,Zhuo Wang,Chuanwei Zhang,Gu Liu
NiO, an anodic electrochromic material, has applications in energy-saving windows, intelligent displays, and military camouflage. However, its electrochromic mechanism and reasons for its performance degradation in alkaline aqueous electrolytes are complex and poorly understood, making it challenging to improve NiO thin films. We studied the phases and electrochemical characteristics of NiO films in different states (initial, colored, bleached and after 8000 cycles) and identified three main reasons for performance degradation. First, Ni(OH) 2 is generated during electrochromic cycling and deposited on the NiO film surface, gradually yielding a NiO@Ni(OH) 2 core–shell structure, isolating the internal NiO film from the electrolyte, and preventing ion transfer. Second, the core–shell structure causes the mode of electrical conduction to change from first- to second-order conduction, reducing the efficiency of ion transfer to the surface Ni(OH) 2 layer. Third, Ni(OH) 2 and NiOOH, which have similar crystal structures but different b -axis lattice parameters, are formed during electrochromic cycling, and large volume changes in the unit cell reduce the structural stability of the thin film. Finally, we clarified the mechanism of electrochromic performance degradation of NiO films in alkaline aqueous electrolytes and provide a route to activation of NiO films, which will promote the development of electrochromic technology.
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ChemSusChem
·
2018
·Vol. 11
·期 13
·2156-2164
·
IF 7.411
Feng Li,Jing Li,Jie Zhang,Lili Gao,Xuefeng Long,Yiping Hu,Shuwen Li,Jun Jin,Jiantai Ma
Graphical Dope to promote : A high-performance photoanode consisting of NiO nanoparticles anchored on a gradient P-doped α-Fe 2 O 3 nanorod array (NiO/P-α-Fe 2 O 3 ) is successfully fabricated. The electrochemical results show that the photoanode presents a high photocurrent density and long-term stability for improved water oxidation. The photoelectrochemical (PEC) water-splitting efficiency of a hematite-based photoanode is still far from the theoretical value due to its poor surface reaction kinetics and high density of surface trapping states. To solve these drawbacks, a photoanode consisting of NiO nanoparticles anchored on a gradient phosphorus-doped α-Fe 2 O 3 nanorod (NR) array (NiO/P-α-Fe 2 O 3 ) was fabricated to achieve optimal light absorption and charge separation, as well as rapid surface reaction kinetics. Specifically, a photoanode with the NR array structure allowed a high mass-transport rate to be achieved, while phosphorus doping effectively decreased the number of surface trapping sites and improved the electrical conductivity of α-Fe 2 O 3 . Furthermore, the p–n junction that forms between NiO and P-α-Fe 2 O 3 can further improve the PEC performance due to efficient hole extraction and the water oxidization catalytic activity of NiO. Consequently, the NiO/P-α-Fe 2 O 3 NR photoanode produced a high photocurrent density of 2.08 mA cm −2 at 1.23 V versus a reversible hydrogen electrode and a 110 mV cathodic shift of the onset potential. This rational design of structure offers a new perspective in exploring high-performance PEC photoanodes.
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高影响因子
MATERIALS & DESIGN
·
2016
·
IF 3.997
Chunpei Yu,Wenchao Zhang,Ruiqi Shen,Xing Xu,Jia Cheng,Jiahai Ye,Zhichun Qin,Yimin Chao
The performances of nanothermites largely rely on a meticulous design of nanoarchitectures and the close assembly of components. Three-dimensionally ordered macroporous (3DOM) NiO/Al nanothermite film has been successfully fabricated by integrating colloidal crystal template (CCT) method and controllable magnetron sputtering. The as-prepared NiO/Al film shows uniform structure and homogeneous dispersity, with greatly improved interfacial contact between fuel and oxidizer at the nanoscale . The total heat output of 3DOM NiO/Al nanothermite has reached 2462.27 J·g − 1 at optimal the deposition time of 20 min, which is significantly more than the values of other NiO/Al structural systems that have been reported before. Intrinsic reduced ignition temperature (onset temperature) and less gas production render the wide applications of 3DOM NiO/Al nanothermite. Moreover, this design strategy can also be readily generalized to realize diverse 3DOM structured nanothermites.
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MICROCHIMICA ACTA
·
2015
·Vol. 183
·期 2
·683-688
·
IF 3.741
Jia Shengsong,Li Pengfei,Koh Kwangnak,Chen Hongxia
The article describes the use of a designed histidine (His)-tagged arginine-glycine-aspartic acid (RGD) peptide as a linker to bind integrin to captured cancer cells, and how to amplify the surface plasmon resonance (SPR) signal after binding of NiO nanoparticles (NiO-NPs) via the His-tag on the peptide. Specifically, breast cancer cells were captured via the interaction between human mucin (MUC-1) and a gold surface modified with a MUC-selective aptamer. The resulting cytosensor exhibits specificity and high sensitivity which is due to the enhancement of the SPR signal by NiO-NPs. The breast cancer cell line MCF-7 can be easily distinguished from normal islet beta cells by using this biosensor. Implementation of the His-tagged RGD peptide modified with NiO-NPs resulted in 20-fold enhancement of the SPR signal at the limit of detection. Hence, the actual limit of detection is lowered to 136 cells per mL. In our perception, this cytosensor has a large clinical potential in that it may also be used to detect various other kinds of tumor cells.
Histidine-tagged arginine-glycine-aspartic acid peptide carried by NiO interacts with the integrin of cancer cells and amplifies the SPR signal resulting from interaction between human mucin (MUC-1) and a gold surface modified with a MUC-selective aptamer. As little as 136 cells·mL −1 are detectable.
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CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Kuan Wang,Tong Sun,Hui Ma,Yi Wang,Zhen-Hong He,Huan Wang,Weitao Wang,Yang Yang,Lei Wang,Zhao-Tie Liu
The photo-driven CO 2 reduction holds significant potential in facilitating carbon fuel conversion. However, the inefficiency of charge conversion severely limits its spractical applications. Herein, the charge transfer routeway was tailored in NiO/BiOCl-7 heterostructures via a transform from type-II to S-scheme for enhancing CO 2 photoreduction to CO. Such S-scheme NiO/BiOCl-7 heterojunctions were prepared by pH-modulation to optimize the energy band structure of BiOCl and introduce abundant oxygen vacancies. Surprisingly, the S-scheme NiO/BiOCl-7 heterojunctions exhibited a significantly enhanced production of CO (78.11 μmol·g −1 ·h −1 ) with an impressive selectivity of 97.1 %, representing a remarkable 1.7- and 4.3-fold improvement in CO yield compared to the type-II NiO/BiOCl heterojunctions and pure BiOCl samples, respectively. The in-situ spectral experiments and DFT calculations reveal that the superior CO production can be attributed to a lower energy barrier for COOH* and a smoother potential energy surface of the S-scheme heterojunction with abundant oxygen vacancies. This meticulous strategy of energy band modulation sheds light on the deliberate customization of Bi-based heterostructures with favorable charge transfer for highly effecient photocatalysis.
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