ENERGY & FUELS
·
2022
·
IF 4.654
Xiang Li,Yawei Liu,Peng Xu,Xigang Du,Gang Mi,Binglong Mao,Jun Zhang
Titanium dioxide–titanium nitride composite (TiO2–TiN) nanoparticles (NPs) were used as a support to load nickel nano particles for the dehydrogenation of ammonia borane (AB) which is a new method. The composite support was fabricated via a simple ultrasonic mixing route, followed by the in situ loading of Ni NPs using a liquid-phase reduction reaction method where sodium borohydride was adopted as a reducing agent. The synthesized samples were characterized by X-ray diffraction spectra (XRD), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), and Ultra Violet-Visible (UV–vis) analyses. The characterization results show that the Ni NPs uniformly dispersed on the support and existed in both zero and oxidized states. Compared with bare TiO2, Ni loading on TiO2–TiN exhibited a higher catalytic activity toward dehydrogenation of AB both under dark and under sunlight irradiation. Ni/10%TiN–TiO2 showed a hydrogen evolution rate with a turnover frequency (TOF) of 8.01 molH2·min–1·molcat–1 at 25 °C under sunlight. The loading of Ni NPs lowered the band gap energy of TiO2, resulting in the enhanced absorption of sunlight. The addition of TiN that acts as electron scavengers improved the separation efficiency of electron–hole pairs. Titanium dioxide–titanium nitride composites play an important role in improving the catalytic dehydrogenation of AB by nickel-based catalysts.
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高影响因子
PHYSICA SCRIPTA
·
2022
·Vol. 98
·期 1
·015012
·
IF 3.081
Juncheng Zhou,Xinyue Huang,Wenlin Feng
A Michelson interferometric carbon monoxide (CO) fiber-optic sensor based on Co/Ni-MOF-74 is proposed and fabricated. The bimetallic-ion-coordination MOFs material Co/Ni-MOF-74 was prepared by solvothermal method. Through XRD and XPS characterizations, the results show that Co/Ni-MOF-74 and Ni-MOF-74 have the same crystal structure. Co/Ni-MOF-74 has a good adsorption effect on CO, and it is integrated into the optical fiber sensing structure for CO detection. In the CO concentration range of 0–35 ppm, the sensitivity and linearity are 0.022 35 dB/ppm and 0.999 36, respectively. The detection limit of the sensor is about 1.990 46 ppm. The presented fiber-optic sensor has excellent selectivity, resistance to temperature interference and good time stability, and it is expected to be applied to the detection of trace CO.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2021
·
IF 5.316
Yunhua Song,Yang Yang,Shudi Mo,Donggang Guo,Lu liu
Construction of heterostructure engineered to modulate the electronic structure and enhance conductivity is an effective approach to enhance the performance of materials. The construction of heterostructure electrocatalysts with efficient catalytic activity by combining 2D nanosheet metal organic frameworks (MOFs) with other earth-rich transition metal oxide materials is a compelling study. Herein, a novel (Fe 2 O 3 ) 0.36 @Ni-MOF heterostructure nanosheets has been synthesized by a rapid one-pot hydrothermal procedure as an efficient OER catalyst. (Fe 2 O 3 ) 0.36 @Ni-MOF exhibited prominent OER property with the overpotential of 230 mV at10 mA cm −2 , a small Tafel slope of 66.7 mV dec −1 and ignorable activity decay after 20 h long-term test at 10 mA cm −2 . The excellent properties of (Fe 2 O 3 ) 0.36 @Ni-MOF nanocomposite could be attribute to the vast amounts of active sites exposed by the nanosheets and ultrasmall size nanoparticles, and the electronic interaction between Fe 2 O 3 and Ni-MOF in the heterostructure. This work presents an attractive tactics for the preparation of heterostructure catalysts with good OER catalytic performance.
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ACS Catalysis
·
2020
·
IF 12.35
Fanpeng Kong,Zhouhong Ren,Mohammad Norouzi Banis,Lei Du,Xin Zhou,Guangyu Chen,Lei Zhang,Junjie Li,Sizhe Wang,Minsi Li,Kieran Doyle-Davis,Yulin Ma,Ruying Li,Alan Young,Lijun Yang,Matthew Markiewicz,Yujin Tong,Geping Yin,Chunyu Du,Jun Luo,Xueliang Sun
Shape-controlled Pt-based bimetallic nanocrystals with ultrathin Pt-rich surfaces are appealing electrocatalysts for some key electrochemical reactions such as the oxygen reduction reaction (ORR) because of the synergistic tuning of topological atom configuration and strengthened electronic effects. However, it is rather challenging to fabricate such particular structures that can remain intact in harsh electrochemical environments, as such Pt-based nanocatalysts are unable to simultaneously achieve both unparalleled activity and robust stability. Here, a facile surface engineering strategy is proposed and employed to atomically tailor the near-surface structure of the Pt1.5Ni octahedra. The engineered Pt–Ni octahedra consist of an ultrathin Pt-rich shell (∼two atomic layers) and Pt-rich bulk composition. The optimized octahedral catalyst exhibits superior specific and mass activity (7.7 mA/cm2Pt and 1.9 A/mg Pt at 0.9 V) for ORR, ∼20 and ∼10 times higher than commercial Pt/C, respectively. The ligand and strain effects arising from the near-surface engineering are unraveled to be responsible for the remarkable ORR activity. Moreover, it shows robust stability with just 9.2% decay in mass activity after accelerated degradation tests (ADTs), as its compositional nature prevents surface Pt atoms and interior Ni atoms from diffusion and dissolution, compared with a decrease of 33% for commercial Pt/C. Our atomical engineered surface strategy illustrates a facile and effective design for a class of Pt-based nanocatalysts with excellent activity and stability.
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Sustainable Energy & Fuels
·
2020
·Vol. 4
·期 9
·4694-4703
·
IF 5.503
Zhewen Ma,Qiuyu Zhang,Subrata Panda,Wen Zhu,Fengzhan Sun,Darvaish Khan,Jinjian Dong,Wenjiang Ding,Jianxin Zou
Nano-confinement (NC) of Mg/MgH2 in suitable host materials is a promising strategy for simultaneously tuning the thermodynamics and kinetics of Mg-based hydride materials. In the present study, the fabrication of multifunctional host materials for NC of MgH2 was firstly attempted with the aim of improving the hydrogen sorption properties of MgH2. The NC of MgH2 in the mesoporous structure of a Ni-based metal–organic-framework (denoted as MgH2@Ni-MOF) was successfully conducted via a combination of solvothermal method and wet impregnation method followed by hydrogenation at relatively lower temperatures. Structural inspections through X-ray diffraction and high resolution transmission electron microscopy demonstrate the in situ formation of Mg2NiH4 around the MgH2 nanocrystals (∼3 nm), due to the reaction between Ni ions from the Ni-MOF and Mg ions from the dibutyl-magnesium (MgBu2) precursor in a hydrogen atmosphere. Hydrogen sorption tests reveal that the thermodynamics (−65.7 ± 2.1 and 69.7 ± 2.7 kJ mol−1 H2 for ab-/desorption, respectively) and kinetics (41.5 ± 3.7 and 144.7 ± 7.8 kJ mol−1 H2 for ab-/desorption, respectively) of Mg/MgH2 in the MgH2@Ni-MOF composite have been significantly improved. Meanwhile, the Ni-MOF scaffold acts as an “aggregation blocker” to impede the growth and agglomeration of Mg/MgH2 nanocrystals during hydriding/dehydriding cycles, leading to outstanding hydrogen cycling stability. The improvement in thermodynamics and kinetics of MgH2@Ni-MOF has been attributed to the synergistic “nanosize effect” of nanoconfined Mg/MgH2 and catalytic effects from in situ formed Mg2Ni/Mg2NiH4.
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Petroleum Science
·
2022
·
IF 4.757
Wei-Long Zhan,Yu-Chao Lyu,Xin-Mei Liu,Lei Fan,Fu-Rang Li,Ye Yang
The Ni/SAPO-11 catalyst used for n-hexane hydroisomerization was prepared via a novel two-step crystallization strategy. It involves introduction of nickel salt into the pre-crystalized system of SAPO-11 by grinding followed by a second crystallization step. No extra solvent is introduced during the whole synthesis procedure which reduces waste liquid emissions significantly. More importantly, interaction between nickel and support is effectively regulated by the novel method to achieve a well dispersed nickel species and inhibit formation of inert nickel spinel simultaneously. Chemical environments of framework Si are tuned to enhance surface acidity of the Ni/SAPO-11 catalyst. It also shows smaller particle size which favors fast diffusion of reactants and products. Insights into the two-step crystallization indicate that accumulation of SAPO-11 precursors in the pre-crystallization stage, pH regulation by nickel salt and structural directing effect of Ni 2+ during the second crystallization period account for the rapid crystal growth and smaller particle size of the Ni/SAPO-11 catalyst. All the unique features endow the Ni/SAPO-11 catalyst higher activity and isomers selectivity than the Pt/SAPO-11 catalyst in n-hexane hydroisomerization.
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高影响因子
APPLIED CATALYSIS A-GENERAL
·
2019
·
IF 4.63
Peng Wu,Jiaqiang Sun,Mohamed Abbas,Pengfei Wang,Yilong Chen,Jiangang Chen
Hydrophobic SiO 2 -supported Fe-Ni bimetallic catalysts were synthesized by facile hydrothermal method, followed by grind-mixing process. The as-synthesized nanoparticles were appointed as robust catalysts in the methanation process to improve the calorific value of the natural gas. Notably, the functionalization of SiO 2 surface with a hydrophobic layer was performed using a fluorinated alkyl group, as a critical step to prohibit the water-gas shift (WGS) reaction and consequently produce low amount of CO 2 content during the methanation process. The obtained catalytic results demonstrated that Fe 1.5 Ni 1.5 catalyst exhibited an excellent CO conversion of 95.2% at 320 °C with a natural gas calorific value of 56.4 MJ Nm −3 , which is much higher than the previously reported results when traditional Ni-based catalysts used. Moreover, the modified hydrophobic catalyst exhibited a lower CO 2 selectivity compared with unmodified one. This study provides a new and promising insight for the design and development of high-calorie SNG product.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2022
·
IF 7.139
Jiameng Sun,Bin Yu,Fuquan Tan,Wanfeng Yang,Guanhua Cheng,Zhonghua Zhang
The synthesis of cost-effective and high-performance electrocatalysts for water splitting is the main challenge in electrochemical hydrogen production . In this study, we adopted a high throughput method to prepare bi-metallic catalysts for oxygen/hydrogen evolution reactions (OER/HER). A series of Ni–Mo alloy electrocatalysts with tunable compositions were prepared by a simple co-sputtering method. Due to the synergistic effect between Ni and Mo, the intrinsic electrocatalytic activity of the Ni–Mo alloy electrocatalysts is improved, resulting in excellent HER and OER performances. The Ni 90 Mo 10 electrocatalyst shows the best HER performance, with an extremely low overpotential of 58 mV at 10 mA cm −2 , while the Ni 40 Mo 60 electrocatalyst shows an overpotential of 258 mV at 10 mA cm −2 in OER. More significantly, the assembled Ni 40 Mo 60 //Ni 90 Mo 10 electrolyzer only needs a cell voltage of 1.57 V to reach 10 mA cm −2 for overall water splitting .
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高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2010
·
IF 3.083
Zhihong Zhu,Lining Qu,Yaqing Guo,Yan Zeng,Wei Sun,Xintang Huang
In this paper a Ni/Al layered double hydroxide (LDH) was first synthesized and further immobilized on a carbon ionic liquid electrode (CILE), which was prepared by using 1-(3-chlorine-2-hydroxypropyl)-3-methylimidazolium acetate as the modifier. The characteristics of LDH/CILE were investigated by scanning electron microscopy (SEM) and cyclic voltammetry . Under the selected conditions the LDH/CILE showed better electrochemical response towards the detection of dopamine (DA) than the CILE. The parameters of DA electro-oxidation on the LDH/CILE were calculated with the values of the electron transfer coefficient ( α ), the number of electrons transferred ( n ), the apparent heterogeneous electron transfer rate constant ( k s ) and the diffusion coefficient ( D ) as 0.426, 2.25, 1.66 s −1 and 7.06 × 10 −5 cm 2 /s, respectively. This modified electrode can be further used to detect DA content in the real drug samples.
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高影响因子
JOURNAL OF POWER SOURCES
·
2016
·
IF 6.333
Xin Ao,Zhaoyin Wen,Yingying Hu,Tian Wu,Xiangwei Wu,Qiming He
Nickel particles with different contents of Ni 3 S 2 surface layer were prepared for their application as cathode materials in Na/NiCl 2 batteries . The surface modification of nickel particles is found to prevent their growth and battery degradation during cycling. The optimum level of surface modification was determined by electrochemical tests and morphology characterization. Excessive Ni 3 S 2 layer seems to cause particle aggregation resulting in low reversible capacity. The capacity of the cell with optimum level of Ni 3 S 2 surface modification layer after 50 cycles is about 4 times greater than that without Ni 3 S 2 surface modification layer.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Lin Zhang,Chengfang Qiao,Xiangyang Cai,Zhengqiang Xia,Jing Han,Qi Yang,Chunsheng Zhou,Sanping Chen,Shengli Gao
Optimizing the microenvironment of MOF pore is an effective strategy to improve the sensitivity of MOF-based electrochemical biosensors. In this work, a series of isomorphic 3D chiral Ni-MOFs with different pore sizes were prepared and used to construct acetylcholinesterase (AChE) biosensors for the electrochemical detection of chiral drug inhibitor galantamine hydrobromide (GH). The combination of the dense metal nodes with intrinsic oxidase-like activity and the high active AChE, creates synergistic catalysis hydrolysis of acetylthiocholine chloride (ATCl) to produce fast sensing response. The more matched size and chirality of MOF pore significantly enhance the host–guest interactions between the substrate and biosensor, which allows the optimum AChE/ L-Ni-BPY /DpAu/GCE platform to exhibit highly sensitive detection of GH, with a lowest detection limit of 0.31 pM and a wide linear range of 1 × 10 −12 ~ 1 × 10 −6 M among the reported pharmaceutical AChE inhibitor sensing systems. Such matching effect is identified and quantified with accurate apparent energy through the detailed microcalorimetry investigations, which well illustrates the structure–activity relationship of the as-synthesized biosensors. The thermodynamically-guided assembling strategy provides new insights into the development of practical MOF-based electrochemical sensors.
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高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2024
·
IF 4.9
Yiyang Bi,Xin Wang,Ke Li,Chengqian Wang,Yu Zhang,Qun Liu
A reasonable introduction of MOFs-derived Ni 2 P with high dispersion is a valid way to reduce the recombination rate of photogenerated electron holes , thus enabling more effective visible light-driven water splitting. Herein, the MOF-on-MOF strategy was used to prepare Ni 2 P@UiO-66-NH 2 by in situ growth of Ni-MOF on UiO-66-NH 2 followed by vapor-phase phosphating, and the composite photocatalyst of CdS/Ni 2 P@UiO-66-NH 2 was obtained by a facile ultrasound method in solvent. UiO-66-NH 2 provides the growth site for Ni-MOF, enabling uniform dispersion of Ni 2 P and the firmly anchoring of CdS. By adjusting the proportion of Ni 2 P@UiO-66-NH 2 , the light absorption capacity and photocatalytic activity can be further optimized. The hydrogen production efficiency of CdS/Ni 2 P@UiO-66-NH 2 can reach up to 2103 µmol·g −1 ·h −1 , which is about 7 times higher than that of pure CdS. The improvement of the photocatalytic performance of CdS/Ni 2 P@UiO-66-NH 2 composites can be mainly ascribed to the increased active sites exposure, well dispersion of CdS, and the creation of multiple heterojunctions , which tune the band gap, broaden the visible light absorption, and facilitate the carrier separation. This work offers an efficient synthetic strategy for creating ternary composites with remarkable catalytic activity and high stability for hydrogen evolution .
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