INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2022
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IF 7.139
Y.F. Wang,X. Luo,W.J. Lu,L. Yang,B. Huang,P.T. Li,Y.Q. Yang
Pt group metals display lower HER activity in alkaline solution than in acidic solution, because they are inefficient in the water dissociation step (Volmer step). Compared with Pt, the activity difference of Rh in alkaline and acidic media is much smaller. Meanwhile, Ni(OH) 2 is proved to be an effective catalyst for water dissociation. Therefore, Rh–Ni(OH) 2 /C nanocomposites with different Rh:Ni(OH) 2 ratios were synthesized by a co-deposition/partial reduction method, and their microstructures as well as electrocatalytic properties were studied. The results show that Rh and Ni(OH) 2 display synergistic effect in Rh–Ni(OH) 2 /C nanocomposites. The Rh–Ni(OH) 2 /C nanocomposite with a molar ratio of Rh to Ni(OH) 2 of 1:1 exhibits the highest activity. It shows an overpotential of 36 mV at 10 mA cm −2 and a Tafel slope of 32 mV dec −1 for HER in alkaline media , which is superior to commercial Pt/C. In addition, the Rh–Ni(OH) 2 /C (1:1) nanocomposite shows excellent durability in alkaline media as well.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2022
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IF 9.965
Zeyu Jiang,Rui Dong,Mingjiao Tian,Chi He,Yani Wu,Mudi Ma,Shouning Chai
Realizing the simultaneous adsorption and activation of O 2 and reactants over supported noble metal catalysts is crucial for the oxidation of organic hydrocarbons. Herein, we report a facile one-step ethylene glycol reduction method to synthesize difunctional Au(OH)K x sites, which were anchored on a hierarchical hollow MFI support and adopted for acetone decomposition. The alkali ion-associated adjacent surface hydroxyl groups were coordinated with Au nanoparticles , resulting in partially oxidized Au 1+ sites with improved dispersion. The results obtained from exclusive ex situ and in situ experiments illustrated that the proper content of K and hydroxyl groups significantly enhanced the adsorption of surface O 2 and acetone molecules around the Au sites simultaneously, whereas the excess K species inhibited the catalytic performance by blocking the pore structure and decreasing the acidity of catalysts. The Au(OH)K 0.7 /h-MFI catalyst exhibited the highest efficiency for acetone oxidation, over which 1500 ppm acetone can be completely oxidized at just 280 °C with an extremely low activation energy of 32.5 kJ mol −1 . The carbonate species were detected as the main intermediates during acetone decomposition over the difunctional Au(OH)K x sites through a Langmuir − Hinshelwood (L − H) mechanism. This finding paves the way for designing and constructing efficient functional active sites for the complete oxidation of hydrocarbons.
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COMPOSITES PART B-ENGINEERING
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2021
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IF 9.078
Jingyi Lu,Pengfei Jia,Can Liao,Zhoumei Xu,Fukai Chu,Mutian Zhou,Bin Yu,Bibo Wang,Lei Song
The progress of super-robust, high ductile polymeric nanocomposite with superior safety have been caught increasing eyesight for the application in electronic products. In this article, strontium hydroxystannate (SSO) nanorods were in-situ fabricated on the surface of titanium carbide (Ti 3 C 2 T x ) MXene nanosheets (MSSO) for improving fire safety and mechanical property of thermoplastic polyurethane (TPU) to further applications of portable devices. With biomimetic method, the tensile robustness and toughness of TPU-2.0MSSO was enhanced by 46% and 126%, respectively. In addition, the TPU-MSSO nanocomposites performed leaf vein-inspired hierarchical structure during the stretching behavior, resulting 55% enhancement of elongation at break . Furthermore, the fire safety was systematically evaluated, and the peak heat release rate (pHRR) decreased by 37.31%. Above all, hazardous pyrolysis products of TPU during the combustion were also efficiently reduced, especially the generation of carbon oxide (CO) and carbon dioxide (CO 2 ) were decreased by 96.04% and 89.85% when the additive of MSSO was only 2 wt%. As a result, ternary catalytic effect and labyrinth structure improved the safety of TPU in modern electronic products. Hence, this leaf vein-inspired TPU-MSSO nanocomposites not only exhibit superior toughness but also reinforce fire safety while facing thermal runaway, which was significant to destroy the formation of thermal disaster chain and maintain further applications of additional products for portable devices, and package materials for flexible electronics.
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ACS Sustainable Chemistry & Engineering
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2020
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IF 7.632
Xiaojuan Zhang,Edouard Asselin,Zhibao Li
The precipitation of CaCO3 and its kinetics for the CaCl2–CO2–Mg(OH)2–H2O system were systematically studied to develop a novel process for eliminating solid and liquid waste from the Solvay soda process. The effects of operating conditions including temperature, CaCl2 concentration, flow rate of CO2, and stirring speed on the reaction kinetics were experimentally determined. The results revealed that low temperature, high CO2 flow rate, and fast stirring speed can accelerate the reaction rate, and the mass transfer of CO2 is the controlling step. An MSMPR crystallizer was used to obtain the experimental crystal size distribution (CSD). A simplified population balance equation (PBE) was used to correlate the parameters on the basis of supersaturation. The soda solid and liquid wastes discharged from the Solvay industry were used as raw material to test the new process and validate the methodology. The precipitated CaCO3 consists of calcite or aragonite with high purity and uniform CSD. A double-effect evaporative-cooling crystallization process to recover MgCl2·6H2O and NaCl was simulated with help of Aspen plus and the electrolyte-NRTL (ELENRTL) model, suggesting economic benefits.
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ACS Applied Energy Materials
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2021
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IF 6.024
Yiwen Hong,Jingxia Yang,WonMook Choi,Jinjie Wang,Jingli Xu
For increasing the specific capacitance of supercapacitors, boron-doped g-C3N4 quantum dots (B-CNQDs) were synthesized by KOH cutting and further adsorbed on the surface of Ni(OH)2 nanoflowers (B-CNQDx-Ni) by a mild impregnation method via electrostatic force. The B-CNQDx-Ni nanocomposites exhibit an increased surface area and reduced band gap energy compared with pure Ni(OH)2, which result in a larger contact area between the electrode and the electrolyte and enhanced charge-transfer kinetics. The best B-CNQDx-Ni sample has an excellent specific capacitance of 1700 F/g at 1.5 A/g, low impedance at the alkaline conduction of 7.421 Ω, and a high stability cycling performance of 82% capacity retention after 5000 cycles, suggesting that B-CNQDx-Ni is a type of suitable electrode material used in supercapacitors.
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SURFACE & COATINGS TECHNOLOGY
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2020
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IF 3.784
Liya Fan,Xiao Zhang,Chuanqun Zhang,Jiangshan Li,Chenglin Wu,Yuxiao Chu,Fangqi Ge,Yiyuan Liu,Xianqiang Xiong
Developing highly stable and broad spectrum responsive semiconductor photoelectrode materials without the use of hole scavengers is challenging for photoelectrochemical protection application. In this study, α-Fe 2 O 3 /NiFe(OH) x electrodes were successfully prepared by combining hydrothermal method and simple drop-casting technique. The morphology, structure, composition and optical property of the obtained electrodes were well characterized by SEM, XRD , XPS and UV–vis DRS . α-Fe 2 O 3 /NiFe(OH) x electrode exhibited enhanced photocathodic protection performance as compared to hematite (α-Fe 2 O 3 ) electrode, and greatly shift photo potential and self-corrosion potential of the coupled 304 stainless steel into a more negative region. Remarkably, under visible light illumination, the prepared electrodes can protect the 304 stainless steel without the use of hole scavengers. Meanwhile, the photoanodes can maintain a better photo-stability without losing its activity. The possible mechanism for the enhanced photocathodic protection performance is proposed, which is involved with the fast hole transfer from hematite to NiFe(OH) x cocatalyst and generates high valence state Ni species to drive the water oxidation reaction. The reduced charge recombination will result in the effective electron transfer from the α-Fe 2 O 3 /NiFe(OH) x electrode to the 304 stainless steel and realize the effective protection.
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MICROCHEMICAL JOURNAL
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2020
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IF 3.594
Muhammad Arsalan,Azka Awais,Xiujuan Qiao,Qinglin Sheng,Jiabin Zheng
A novel nonenzymatic glucose sensor based on Ni 50 Co 50 (OH) 2 /BO X /FTO was constructed with high sensitivity and excellent selectivity when compared with Ni(OH) 2 /FTO and Co(OH) 2 /FTO. Ni 50 Co 50 (OH) 2 /BO X /FTO glucose sensor with nanometric size was made by using a simple colloidal method. The morphological demonstration of nanomaterials/nanoparticles were characterized by using TEM (transmission electron microscopy), energy dispersive X-ray spectroscopy (EDX), scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS), XRD and Raman, showing homogenously immersed particles with a size of less than 50 nm. Electrochemical measurements showed that colloidal based Ni 50 Co 50 (OH) 2 /BO X /FTO electrocatalyst possessed good catalysis capacity with low onset potential and excellent catalytic activity toward glucose. Nanocomposite has excellent sensitivity of 927.3 μA mM −1 cm −2 , a wide linear range of 0.005 mM to 10.83 mM and LOD (low detection limit) of 0.017 μM (S/N = 3). Nanocomposites were applied for glucose determination in blood serum samples with standard addition; promising results were obtained with a standard deviation of ±1 to 2.5%. Nanocomposite show good reproducibility or recovery towards glucose. Ni 50 Co 50 (OH) 2 /BO X /FTO provide a new easy platform for electrochemical determination of glucose as nonenzymatic sensor.
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Small
·
2020
·Vol. 16
·期 8
·1907043
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IF 11.459
Chun Li,Yanting Gao,Xifeng Xia,Junwu Zhu,Xin Wang,Yongsheng Fu
Conjugated coordination polymers (CPs) with designable and predictable structures have drawn tremendous attention in recent years. However, the poor electrical conductivity and low structural stability seriously restrict their practical applications in electronic devices. Herein, the rational design and synthesis of a hierarchically structured 2D bimetallic CoNi-hexaaminobenzene CPs derived from Co(OH) 2 are reported as an efficient oxygen evolution reaction (OER) self-supported electrode. The as-obtained electrode possesses high electrochemical surface area and intrinsic activity, exhibiting high electrochemical catalytic activity, favorable reaction kinetics performance, and strong durability compared with those of the powder catalysts. As a result, the electrode delivers low overpotential of 219 mV @ 10 mA cm −2 and Tafel slope of 42 mV dec −1 as well as 91.3% retention of current density after 24 h of reaction time. The results of density functional theory computations reveal that the synergistic effect of Co and Ni plays an important role in OER. This work not only presents a strategy to fabricate advanced self-supported electrodes with abundant and dense active sites, but also promotes the development of conjugated CPs for electrocatalysis.
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Small Methods
·
2026
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IF 8.7
Rimsha Abbas,Muhammad Umair,Zhao Fu,Jingjing Luo,Suzhu Yu,Jun Wei
Omnidirectional strain sensors capable of detecting large and complex deformations are highly promising for wearable motion monitoring; however, achieving both multidirectional strain perception and enhanced electrical sensitivity remains challenging. Herein, a peelable circular piezoresistive strain sensor based on KH570-modified hydroxylated multi-walled carbon nanotubes (m-MWCNT-OH)/Ecoflex is developed through a screen-printing strategy and further functionalized with a copper (II) 2,3,6,7,10,11-hexahydroxytriphenylene (Cu 3 (HHTP) 2 ) conductive metal-organic framework (c-MOF)/poly(3,4-ethylenedioxythiophene) nanofiber (PEDOT-NFs) nanolaminate. The circular sensing architecture facilitates uniform strain distribution and orientation-independent strain transfer, while the c-MOF/PEDOT-NFs coating constructs additional conductive pathways, enhancing strain-induced resistance variation. The sensor is fabricated using a sequential process involving screen printing of the m-MWCNT-OH/Ecoflex sensing layer, peel transfer, and spray deposition of the functional coating. The resulting sensor demonstrates a wide strain detection range of 0%–300%, a gauge factor (GF) of 8, a fast response time of 33 ms, a recovery time of 420 ms, and stable performance over 10 000 loading-unloading cycles. Compared with unmodified sensor, c-MOF/PEDOT-NFs functionalization significantly improves electrical sensitivity while maintaining the intrinsic omnidirectional sensing capability. Finite element analysis (FEA) confirms similar strain-transfer characteristics under different loading directions. The sensor enables accurate monitoring of multidirectional human motions, highlighting its potential for wearable electronics, soft robotics, and human-machine interfaces.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2023
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IF 9.9
Xupo Liu,Ran Wang,Mengyun Wei,Xihui Wang,Jiayao Qiu,Jingru Zhang,Shilong Li,Ye Chen
Electrochemical oxidation of biomass-based 5-hydroxymethylfurfural (HMF) is an effective approach for achieving the high-value products of 2,5-furandicarboxylic acid (FDCA). However, the restricted formation of high-valence metal active species for electrocatalysts results in a sluggish kinetic process of HMF oxidation reaction (HMFOR). Herein, we fabricated the Ni 3+ -rich cross-linked α-Ni(OH) 2 nanosheets for accelerating the HMFOR through an anion-mediated strategy. It is identified that the Cl − ions with strong penetrability replace a portion of lattice oxygen atoms in α-Ni(OH) 2 to form Ni-Cl bonds, contributing to breaking the inherent lattice order and generating a special Ni 3+ -rich structure. Owing to the promoted adsorption and accelerated oxidation of hydroxyl and aldehyde groups by the affluent Ni 3+ active species, the large oxidation current density of 116.5 mA cm −2 and HMFOR kinetic constant of 0.067 min −1 has been achieved at 1.45 V (vs. RHE). By analyzing the oxidation products, the FDCA yield and Faradic efficiency are both higher than 99.25 % and 99.36 % for five successive determinations. Therefore, this work provides an insightful anion-mediated strategy for designing high-performance electrocatalysts for biomass conversion application.
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INORGANIC CHEMISTRY
·
2023
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IF 4.6
Tingting Fan,Li Cai,Zhulin Huang,Haibin Tang,Lijun Zhang,Zhongbo Li
A simple and reliable method is developed to fabricate Ag-nanoparticle-decorated Co(OH)2 nanoflowers grafted on polyacrylonitrile (PAN) nanopillar arrays as uniform and sensitive surface-enhanced Raman scattering (SERS) substrates. First, Co(OH)2-nanosheet-assembled nanoflowers are achieved on the highly uniform PAN nanopillar arrays via electrochemical deposition. Then, Ag nanoparticles (Ag-NPs) are decorated onto the Au-nanoparticle-precoated Co(OH)2 nanoflowers based on a spontaneous redox reaction (SRR) between the silver ions and Co(OH)2 nanosheets at room temperature. Ag-NPs can be successfully in situ synthesized on the Co(OH)2 nanoflowers, and Au nanoparticles precoated on the surface of the Co(OH)2 nanosheets can ensure that the Co(OH)2 nanoflower structure does not collapse. Because of the highly uniform PAN nanopillar arrays and the high-density sub-10 nm gaps between the neighboring Ag-NPs on the surface of the Co(OH)2 nanoflowers, the hierarchical three-dimensional Ag@Co(OH)x grown on PAN nanopillar arrays can produce a reproducible and sensitive SERS effect. To verify the SERS performance of the substrate, 4-aminothiophenol (4-ATP) is used as the probe molecule, and the Ag@Co(OH)x grown on PAN nanopillar arrays is employed as the SERS substrate. As a result, 4-ATP concentrations as low as 10–10 M can still be identified, exhibiting high SERS activity. Additionally, the relative standard deviation value of the main characteristic peak of 10–5 M 4-ATP is 9.43%, indicating good uniformity of the SERS signal of the substrate. The SRR between silver ions and Co(OH)2 can provide a simple route to prepare heterostructures as SERS substrates, which has great potential for application in the field of analysis.
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TALANTA
·
2023
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IF 6.1
Xiaojun Wen,Huan Cheng,Weilong Zhang,Lijun You,Jumei Li
To enable the widespread application of surface-enhanced Raman scattering (SERS) technique in practical sensing of organic pollutants, it is essential to develop a reliable SERS substrate that offers both high sensitivity and reusability. In this study, we employed a simple and rapid in-situ deposition method to coat Ag nanoparticles onto flower-like Ni(OH) 2 spheres, resulting in the formation of Ni(OH) 2 /Ag composites with excellent photocatalytic performance and SERS activity. These composites were used as a promising SERS analysis tool for effective detection of organic pollutants, including ciprofloxacin hydrochloride (CIP) and methylene blue (MB). Notably, the composites exhibited outstanding detection limits of 10 −8 M for MB and 10 −7 M for CIP, respectively, and showed a strong linear relationship between SERS intensities and the logarithmic concentration (R 2 ≥ 0.97). Moreover, under simulated sunlight irradiation, the Ni(OH) 2 /Ag composites efficiently degraded MB and CIP molecules within a short period of 120 min for MB and 130 min for CIP. This demonstrated their practical reusability, as evidenced by their consistent performance over five cycles of SERS sensing. These findings underscore the significant potential of these composites for SERS-based detection of trace pollutants and ecological restoration through photocatalytic reactions in the future.
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