CHEMICAL ENGINEERING JOURNAL
·
2024
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IF 13.3
Hui Xu,Haoran Zhong,Jinwu Hu,Xianjun Rong,Wenhui Zhang,Yinsheng Wang,Shengjuan Li,Guisheng Li,Ding Wang
Aiming to achieve high-sensitivity volatile organic compounds (VOCs), it is of great significance to continuously enhance the sensing performance of metal oxide based sensors. Herein, novel NiO nanoplates-decorated on SnO 2 nanofibers 1D core–shell structures derived from metal-organic frameworks (MOFs) are fabricated by the facial solvothermal method and heat treatment for VOCs gas sensors. The morphology and composition of 1D core shell SnO 2 @NiO are regulated by solvothermal time in the range of 0 ∼ 24 h. Based on the unique structure and composition of SnO 2 @NiO, SnO 2 @NiO with 4 h solvothermal time (denoted as SnO 2 @NiO-4) exhibits excellent selectivity, high response (R a /R g = 25.6) and low detection limit as well as good response linearity between response and concentration of xylene. Especially, the obtained SnO 2 @NiO-8 and SnO 2 @NiO-16 show the high sensitivity to acetone (R a /R g = 28.7) and triethylamine (R a /R g = 13.7), respectively. Structural characterizations such as SEM, TEM, and Mott-Schottky results demonstrate the core–shell structure with p-n heterojunction. In-depth investigations on reaction mechanism reveal XPS, photoluminescence (PL), and ESR testing reveal the intrinsic defects such of oxygen vacancy and Ni 3+ active sites. And in situ FTIR, online mass spectroscopy, as well as UV/UPS analysis further discover the evolution of intermediates and products during the surface catalysis reaction. These results demonstrate that the remarkable sensing performance of SnO 2 @NiO-8 can be attributed to several factors, including abundant oxygen vacancy, formation of p-n heterostructure and efficient Ni 3+ /Ni 2+ catalyzing, which beneficial for increased active sites and enhanced electron transport. This synthetic strategy provides an effective method for the facile engineering of high-performances metal oxide-based sensors towards practical health assessment.
研究领域:
材料科学
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化学工程
·
传感器技术
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DOI
高影响因子
MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
·
2021
·
IF 3.927
Qian Ma,Hang Li,Jia Guo,Shushu Chu,Qi Zhang,Ziqiong Lin
Porous SnO 2 /NiO hollow nanofibers with effective surface transmission behavior have been prepared through a facile modified electrospinning method . The introduction of Ni component into the precursor solution can not only regulate the morphological evolution together with the nucleation and crystallization of oxide heterostructures at the elevated temperature action, but also significantly contribute to the enhancement of the gas-sensing performance for testing n-butanol gas. SnO 2 /NiO composites can present the highest response of 199 at the optimum operating temperature of 280 °C toward 100 ppm n-butanol gas, which is 4.5 times than that of pure SnO 2 nanofibers. Meanwhile, the response/recovery times of the sensors can be immensely decreased from 57/16 s of pure sample to 36/10 s as the adding amount of Ni component increasing to 5%, along with the superior selectivity and long-term stability toward n-butanol. The excellent gas-sensing properties of the sensors can be mainly attributed to the flourishing porous one-dimensional (1D) microstructure containing the closely connected p-n heterojunctions of SnO 2 and NiO, which can provide large specific surface areas with a mass of active sites to promote the reaction between n-butanol molecule and O δ− on the surface.
研究领域:
材料科学
·
化学工程
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DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2018
·
IF 6.735
Wenming Zhang,Pin Cao,Ling Li,Kun Yang,Kun Wang,Shuo Liu,Ze Yu
The combination of high-capacity and long cycle stability has always been regarded as a prerequisite for efficient anode materials in sodium-ion batteries (SIBs). In this work, we design and synthesize carbon-encapsulated 1D SnO 2 /NiO heterojunction hollow nanotubes (SnO 2 /NiO@C) and successfully apply them as an anode material for SIBs . SnO 2 /NiO@C is synthesized by a facile electrospinning technique and subsequent chemical bath deposition, followed by polydopamine (PDA) carbonization. The 1D hollow structure can effectively reduce the diffusion length of sodium ions and the large volume variation of SnO 2 during cycling. In addition, carbonized PDA is uniformly dispersed on the SnO 2 /NiO hollow nanotubes, not only contributing to structural stability, but also acting as a conductive matrix to enhance the battery performance. SIBs based on SnO 2 /NiO@C anodes exhibit a highly reversible capacity of 320 mAh g −1 after 200 cycles at 100 mA g −1 and a considerably stable long cycling performance. The present work highlights the potential of SnO 2 /NiO@C based anode materials for the development of high-performance SIBs with combined high capacity and long cycle stability.
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DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2026
·
IF 6.6
Yunxu Yang,Xiaoxi Huang,Yong Shen Chua,Hooi Ling Lee
Fe–SnO 2 @NiO–NF removed 96.85% CIP within 150 min under solar light. • S-scheme heterojunction promotes charge separation and photocatalytic activity. • 3D NiO–NF support enables easy recovery and abundant active sites. • Over 94% degradation activity was retained after four cycles. • DFT and HPLC–MS reveal charge transfer and CIP degradation pathways. Photocatalysis is effective for antibiotic degradation but limited by poor charge separation and difficult recovery of powder catalysts. In this work, a macroscopic p–n heterojunction photocatalyst (Fe–SnO 2 @NiO–NF) was prepared on pre-oxidized nickel foam through in situ growth and microwave-assisted synthesis. XRD confirmed the coexistence of SnO 2 and NiO phases, while HRTEM and XPS analyses verified the successful construction of the Fe–SnO 2 /NiO heterojunction with intimate interfacial contact and interfacial electronic interaction. UV–vis DRS, PL, TRPL, EIS, and photoelectrochemical measurements demonstrated markedly improved light absorption, charge separation and transfer behavior, with a narrowed band gap of 2.92 eV and a prolonged average carrier lifetime of 1.2226 ns. Owing to the enhanced charge separation and the conductive 3D NiO–NF framework, Fe–SnO 2 @NiO–NF exhibited significantly improved photocatalytic activity for ciprofloxacin degradation under solar irradiation, reaching 96.85% removal within 150 min, while the immobilized catalyst could be readily separated from the aqueous solution. ESR and scavenging test identified •O 2 – and h + as the main reactive species, with •O 2 – playing the dominant role, while HPLC–MS revealed the degradation intermediates and pathways. Band structure analysis and DFT calculations demonstrated that the p–n heterojunction follows an S-scheme charge transfer mechanism, promoting efficient charge separation while preserving strong redox capability. The composite retained over 94% of its initial activity after four cycles, showing excellent stability and recyclability. This study provides a practical way to develop efficient and reusable photocatalysts for antibiotic wastewater treatment. Download: Download high-res image (182KB) Download: Download full-size image
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产品关联
DOI
高影响因子
IONICS
·
2023
·Vol. 29
·期 9
·3459-3471
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IF 2.8
Ye Wenbin,Lei Jinxuan,Jiang Chaokui,Feng Zuyong,Xiong Deping,He Miao
Large capacity, high rate, and long-term cycling stabilities have always been pursued by lithium-ion batteries (LIBs). In this work, the straightforward hydrothermal and high-speed ball milling programs were employed to create the SnO 2 -NiO-C anode material. NiO nanoparticles with unique hexagonal crystal structure are an ideal choice for ion cycling and embedding, which can stabilize the structure and prevent SnO 2 from becoming coarser. The graphite encapsulated in the outer layer can effectively prevent volume expansion during the cycling as well. From the research results, SnO 2 -NiO-C exhibits a significant reversible capacity of 1224.3 mAh g −1 after 300 cycles at 0.2 A g −1 , and after the fourth cycle, the coulombic efficiency remains above 97%. And it also possesses a long-term cycling stability of 820.1 mAh g −1 after 1000 cycles at 1.0 A g −1 . Also, a significant rate property can reach 507.1 mAh g −1 even at 5.0 A g −1 . Therefore, the SnO 2 -NiO-C anode material for LIBs is promising because of its excellent electrochemical performance.
研究领域:
材料科学
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纳米技术
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电化学
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储能
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DOI
高影响因子
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