APPLIED SURFACE SCIENCE
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2022
·
IF 7.392
Xiaobin Dong,Han Wang,Xiaolong Li,Pedram Fatehi,Shoujuan Wang,Qin Wu,Keyin Liu,Fangong Kong
Graphitic carbon nitride is a very potential photocatalytic catalyst for H 2 production, but its practical application is seriously limited by the fast recombination of photogenerated carriers and insufficient utilization of surface charge. In order to solve these problems, herein, a series of g-C 3 N 4 -NiO-NiS x photocatalysts were synthesized by first calcining the precursor to load NiO on g-C 3 N 4 and subsequently partial sulfidation of NiO into NiS x in situ via a hydrothermal process. Under the irradiation of visible light, the photocatalytic H 2 production rate of g-C 3 N 4 -NiO-0.4T can be up to 1248.1 μmol·g −1 ·h −1 using triethanolamine as sacrificial agent. In addition, recycling test also confirmed g-C 3 N 4 -NiO-0.4T has excellent photostability. It is believed that the formation of p-n junction between NiO and g-C 3 N 4 and the presence of NiS x promote the spatially fast separation of photogenerated carriers, while the abundant interface of NiS 2 and NiS also leads to the good proton trapping ability. These two factors jointly determine the efficient H 2 production of the composite photocatalysts. Furthermore, the detailed energy band structure and plausible photocatalytic mechanism of g-C 3 N 4 -NiO-NiS x are also proposed. This work can offer a new route and useful reference for the design and research of high efficiency composite photocatalysts for H 2 production.
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APPLIED SURFACE SCIENCE
·
2022
·
IF 7.392
Junkai Wang,Xiangtao Huo,Furong Yan,Haolei Wang,Mei Zhang,Min Guo
In this study, a novel bifunctional lamella self-assembled nanosheet arrays of Cu-doped NiO electrode was hydrothermally synthesized to improve and balance its electrochromic-energy storage performance. When Cu doping amount was 1%, the as-prepared nanostructured electrode exhibited both excellent electrochromic properties including large optical modulation (77.1% at 550 nm) and long stability (98.3% retention of maximum optical modulation after 4000 cycles), and good capacitive properties, especially high area specific capacitance (94.7 mF/cm 2 at 0.2 mA/cm 2 ) as well as excellent capacitance stability (100% at 50 mV/s for 2000 cycles; 80.6% retention at 0.8 mA/cm 2 for 5000 cycles). These excellent properties may benefit from the large active specific surface area and low charge transport resistance. Meanwhile, the self-assembled structure and cross-linked nanosheets optimize the structural stability of the film. Notably, an electrochromic-energy storage device (EESD) was constructed and demonstrated excellent electrochromic-energy storage performance. In charging process, two integrated EESDs in series turned into dark brown and an LED was lit up. While, in discharging process, the EESD gradually became colorless and the LED went out. This study may point out the direction for developing new visualized energy storage devices.
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APPLIED SURFACE SCIENCE
·
2021
·
IF 6.707
Chuanxin Yu,Mingxia Li,Decai Yang,Kai Pan,Fan Yang,Yachao Xu,Lang Yuan,Yang Qu,Wei Zhou
The low charge separation efficiency of semiconductor photocatalyst is still a stumbling block to improve photocatalytic performance. The p-n heterojunction with built-in electric field usually favors the spatial charge separation. Herein, NiO nanoparticles dotted TiO 2 nanotubes p-n heterojunction photocatalysts (NiO/TNs) are fabricated through hydrothermal and wet-impregnation strategies. The resultant NiO/TNs with relatively large surface area of 102.8 m 2 g −1 shows excellent photocatalytic H 2 production rate of 228 μmol h −1 g −1 , which are four times higher than that of TNs (50 μmol h −1 g −1 ) under AM 1.5G irradiation without any cocatalyst. The high photocatalytic activity can be ascribed to the uniform growth NiO nanoparticles on surface of TNs enhancing the photoresponse to visible light region, and the formation of p-n heterojunctions induced built-in electric field promoting photogenerated electrons transmission from NiO to TNs through the heterogeneous interface, thus enhanced the charge carriers migration and separation efficiently.
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SURFACE & COATINGS TECHNOLOGY
·
2020
·
IF 3.784
Qiyue Zhou,Ming Bao,Xiuyuan Ni
In this article, we synthesized a ternary silicon nanowire arrays (SiNWs)-based composite electrode by a novel wet-chemical technique for the application in high-performance supercapacitors . Initially, the polydopamine (PDOP) was loaded as the modifier to enhance the surface hydrophilicity properties of the SiNWs. Meanwhile, PDOP serves as the nitrogen-doped carbon source. Subsequently, the conformal PDOP layer was used as the template to guide the preferential deposition of the nickel oxide (NiO) precursor. Finally, the SiNWs/NC@NiO composite electrode was obtained by a one-step calcination process. The existence of the N-doped carbon was characterized by the XPS and element analysis characterizations. The FE-SEM characterizations revealed the formation processes of NiO nanoflakes precursor on PDOP layer. The N-doped carbon and nickel oxide play a synergistic role in enhancing the electrochemical performance in aqueous electrolytes. The as-prepared SiNWs/NC@NiO composite electrode shows an areal specific capacitance as high as 110 mF/cm 2 at the current density of 1.0 mA/cm 2 .
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MICROCHIMICA ACTA
·
2019
·Vol. 186
·期 11
·1-8
·
IF 5.479
Duan Wei,Yan Pengcheng,Dong Jintao,Chen Yun,He Xiaoyang,Chen Jianping,Qian Junchao,Xu Li,Li Henan
A self-powered photoelectrochemical (PEC) aptamer probe is presented for the determination of oxytetracycline (OTC). The assay is based on the use of g-C 3 N 4 and NiO nanocrystals (NCs) which form a heterojunction. The latter was prepared by two-step hydrothermal pyrolysis by using the ionic liquid 1-hydroxyethyl-3-methylimidazole chloride which functions as a morphological template to form NiO NCs. The heterojunction exhibits much better electronic conductivity, wider absorption range, higher electron-hole-separation productivity, and stronger photocurrent compared to plain g-C 3 N 4 . The heterojunction was adopted to construct a self-powered PEC aptamer probe for OTC detection. An OTC-binding aptamer was immobilized on the heterojunction and the probe was constructed. The aptamer on the probe binding with OTC can form steric hindrance for transmitting of electrons and cause the PEC signal change depending on the OTC concentration. The photocurrent decreases with increasing OTC concentration in the 0.01 to 100 nM concentration range and its detection limit is 4 pM (at S/ N = 3).
Schematic representation of a self-powered photochemical aptamer probe. The probe performs enhanced ability for oxytetracycline (OTC) determination due to the formation of NiO nanocrystals/g-C 3 N 4 (NiO NCs/g-C 3 N 4 ) heterojunction and the specification recognition of the aptamer.
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JOURNAL OF PHYSICS D-APPLIED PHYSICS
·
2019
·Vol. 53
·期 7
·075101
·
IF 2.829
Y Y Wang,L T Li,X Jiang,J B Wang,R L Lai,X Y Qiu
Electric field-induced drift of ions or charged defects in organic–inorganic hybrid perovskite materials generally results in distinct current–voltage hysteresis, opening up a new era in the development of low-cost resistive switching memory and neural synapse devices. Here, a new type of resistive switching memory cell based on NiO-buffered CH3NH3PbI3 films is prepared by a solution method. It exhibits stable and low voltage bipolar resistive switching behaviors: switching voltages lower than ±0.5 V, an ON/OFF ratio higher than 103, and a reversible current–voltage loop of more than 400 cycles in air ambient. Both 'iodine-vacancy conductive filaments' and the 'interfacial p–n junction effect' are responsible for the improved resistive switching properties. This work establishes the potential for application in low operation voltage organic–inorganic hybrid perovskite resistive switching devices.
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Materials Today Energy
·
2023
·
IF 9.3
Fangyuan Zhang,Xueli Zhang,Shan Hu,Huilin Hu,Jinhua Ye,Defa Wang
Photothermal catalytic carbon dioxide (CO 2 ) reduction has attracted increasing research attention as a promising method for recycling CO 2 and producing renewable energy. However, it remains a challenge in the improvement of catalytic activity with regulated product selectivity in view of practical applications. Herein, we develop the two-dimensional layered V 2 C MXene (VC) supported Ni nanoparticle and NiO nanosheet (Ni@NiO/VC) composite as an efficient catalyst for selective photothermal reduction of CO 2 to CH 4 . The optimal 0.8Ni@NiO/VC catalyst exhibits 48.1 % CO 2 conversion with an evolution rate of 33.2 mmol/g cat /h and 99.2 % selectivity for CH 4 production under a 300 W full-arc xenon lamp irradiation. Moreover, a long-term cyclic photothermal CO 2 reduction reaction demonstrates the excellent stability of 0.8Ni@NiO/VC. The enhanced photothermal CO 2 reduction activity with a high CH 4 selectivity could be attributed to the large specific surface area and excellent photothermal effect of V 2 C MXene, and the synergistic effect of Ni and NiO on adsorption/activation of H 2 and CO 2 molecules. This work provides a feasible strategy for the construction of efficient photothermal CO 2 reduction catalyst by properly incorporating transition metal nanoparticles and metal oxide with a suitable MXene.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2023
·
IF 6.2
Jiabo Wang,Jie Zhang,Peng Zhang,Yalin Fu,Zhentao Liu,Baolei Liu,Jibo Zhang,Li Chen
ABSTRACT The oxygen evolution reaction (OER) is a key half-reaction in renewable energy-related technologies, such as the electrocatalytic water splitting process and carbon dioxide reduction reaction. Unfortunately, developing an efficient and stable electrocatalyst to overcome the sluggish kinetics of OER remains a challenge. Herein, uniformly dispersed NiO and FeNi 3 alloy nanoparticles anchored on N-doped porous carbon (NC) electrocatalysts were designed and synthesized by a facile two-step calcination strategy. The influence of calcination temperature and the molar ratio of Ni:Fe on electrocatalytic OER activity was particularly studied. With an optimal calcination temperature and Ni/Fe ratio, FeNi 3 @NC-800 exhibited outstanding OER performance with a low overpotential of 242 mV at a current density of 10 mA cm −2 and a small Tafel slope of 34.7 mV dec −1 in alkaline media. The enhanced OER activity of FeNi 3 @NC-800 is mainly due to the synergistic effect of FeNi 3 alloy nanoparticles with NC and the high electrical conductivity between FeNi 3 and NC. This research will offer a new perspective on the construction of efficient and stable non-noble metal OER electrocatalyst.
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Polymers
·
2023
·Vol. 15
·期 9
·2135
·
IF 5
Mingqiang Shao,Ying Li,Yiran Shi,Jiangtao Liu,Baoxia Xue,Mei Niu
It is difficult to enhance the char yields of polypropylene (PP) due to the preferential complete combustion. Successful formation of abundant char layer structure of PP upon flammability was obtained due to the synergistic effect of NiO, Al2O3and activated carbon (AC). From characterization of scanning electron microscopy (SEM) and transmission electron microscopy (TEM), it was revealed that the microstructure of residual char contained large amount of carbon nanotubes. Compared to the modification of AC, NiO and Al2O3alone, the combination of AC, NiO and Al2O3dramatically promotes the charring ability of PP. In the case of AC and NiO, NiO plays a role of dehydrogenation, resulting in the degradation product, while AC mainly acts as carbonization promoter. The addition of Al2O3results in higher dispersion and smaller particle size of NiO, leading to greater exposure of active sites of NiO and higher dehydrogenation and carbonization activity. Compared to the neat PP, the decomposition temperature of the PP modified by combined AC, NiO and Al2O3was increased by 90 ℃. The yield of residual char of AC-5Ni-Al-PP reached as high as 44.6%. From the cone calorimeter test, the heat release rate per unit area (HRR) and total heat release per unit area (THR) of PP composite follows the order AC-5Ni-Al-PP < AC-10Ni-Al-PP < AC-Ni-PP < AC-15Ni-Al-PP < AC-1Ni-Al-PP. Compared to the neat PP, the peak of HRR declined by 73.8%, 72.7%, 71.3%, 67.6% and 62.5%, respectively.Keywords:polypropylene composites;activated carbon;NiO;Al2O3;carbon nanotubes;flame retardancy;thermal stability
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2023
·
IF 6.2
Jinghong Pan,Chuxiao Sun,Jiajun Liu,Xishan Zhao,Chunxiao Jiao,Chengkai Wang,Qi Wang
Si-based materials are the most potential high-capacity anode material for lithium-ion batteries due to their theoretical specific capacity of 4200 mAh g −1 , significantly higher than the current commercial graphite anode (372 mAh g −1 ). However, the significant volume change (>300%) of Si-based materials during the embedding of lithium ions into Si NPs results in various issues, such as short cycle life and low electrical conductivity , which significantly restricts their commercial development. This study introduces a new flower-like Si@NiO/reduced graphene oxide (rGO) ternary composite synthesized using a straightforward and low-pollution one-step synthesis technique. A distinctive composite flower-like structure is created by wrapping Si NPs in NiO nanoflowers and embedding the rGO nanosheets in the NiO "petal" structure. This structure can shorten the lithium-ion transport path, provide a superb conductive network, effectively reduce the electrode's bulk effect and improve the structural stability of the anode material. Additionally, the structure provides more capacity for the electrodes. At a current density of 1 A g −1 and after 700 cycles, the Si@NiO/rGO anode displays a discharge-specific capacity of 1081.34 mAh g −1 thanks to its one-of-a-kind flower-like structure. At various current densities, the Si@NiO/rGO anode likewise demonstrates outstanding electrochemical performance. Additionally, the volume growth of the flower-like Si@NiO/rGO anode material after 700 cycles is approximately 15.08%, substantially less than that of Si NPs. The new flower-shaped Si@NiO/ rGO ternary composite, synthesized in a simple and cost-effective way, offers not only an alternative for the preparation of Si-based electrode materials that can alleviate their drastic volume expansion but also an effort to create new renewable green energy storage devices.
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APPLIED PHYSICS LETTERS
·
2023
·Vol. 122
·期 12
·
IF 4
Zhu Guozhen,Yang Qihao,Che Renchao
Co 3 O 4 /NiO@C (CNOT@C) microspheres were synthesized via a facile solvothermal method and annealing treatment under an argon atmosphere. A high initial reversible specific capacity of 1469.7 mA h g −1 of CNOT@C was attained due to its high specific surface area from its unique triangular hollow tube morphology. These triangular hollow tubes relieved volume expansion from repeated cycling processes, with CNOT@C attaining a high reversible specific capacity of 694.9 mA h g −1 after 1000 cycles at 6000 mA g −1 . Furthermore, excellent rate performance of CNOT@C was achieved due to its carbon layer coating, exhibiting a reversible specific capacity of 429.8 mA h g −1 at 10 000 mA g −1 .
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Small
·
2023
·Vol. 19
·期 16
·2206873
·
IF 13.3
Tingshi Zhang,Yanting Zheng,Xin Zhao,Mingxiong Lin,Bixia Yang,Jiawei Yan,Zanyong Zhuang,Yan Yu
Preparation of holey, single-crystal, 2D nanomaterials containing in-plane nanosized pores is very appealing for the environment and energy-related applications. Herein, an in situ topological transformation is showcased of 2D layered double hydroxides (LDHs) allows scalable synthesis of holey, single-crystal 2D transition metal oxides (TMOs) nanomesh of ultrathin thickness. As-synthesized 2D Co/NiO-2 nanomesh delivers superior photocatalytic CO 2 -syngas conversion efficiency (i.e., V CO of 32460 µmol h −1 g −1 CO and V H 2 ${V_{{{\rm{H}}_2}}}$ of 17840 µmol h −1 g −1 H 2 ), with V CO about 7.08 and 2.53 times that of NiO and 2D Co/NiO-1 nanomesh containing larger pore size, respectively. As revealed in high-angle annular dark-field scanning transmission electron microscopy (HAADF-STEM), the high performance of Co/NiO-2 nanomesh primarily originates from the edge sites of nanopores, which carry more defect structures (e.g., atomic steps or vacancies) than basal plane for CO 2 adsorption, and from its single-crystal structure adept at charge transport. Theoretical calculation shows the topological transformation from 2D hydroxide to holey 2D oxide can be achieved, probably since the trace Co dopant induces a lattice distortion and thus a sharp decrease of the dehydration energy of hydroxide precursor. The findings can advance the design of intriguing holey 2D materials with well-defined geometric and electronic properties.
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