Journal of Materials Chemistry C
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2021
·Vol. 9
·期 22
·7046-7056
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IF 7.393
Wen Wang,Qiaoyu Cui,Dong Sun,Qun Yang,Jun Xu,Wei Liao,Xueqin Zuo,Huaibao Tang,Guang Li,Shaowei Jin
The low conductivity and catalytic activity of counter electrode (CE) materials in the electrolyte of dye-sensitized solar cells (DSSCs) has resulted in unprecedented challenges, limiting their development. Herein, a highly efficient CE material was synthesized by uniformly distributing transition metal selenides in a metal–organic framework (MOF, denoted as CoSe2@NC), and then integrating carbon nanotubes, which were finally designed as integrated interconnected nanoreactors (CoSe2@NC-CNTs). Consequently, DSSC with three-dimensional (3D) reticular CoSe2@NC-CNT CE displayed a superior power conversion efficiency (PCE) of 9.25%, exceeding that of Pt CE (7.81%). This outstanding performance is attributed to: (1) the increased specific surface area, which promotes the absorption of the dye and electrolyte, (2) the metal-on-MOF hierarchical structure as a unique crystalline porous material, which optimizes the efficiency of the metal nanoparticles, (3) the doping of heteroatom (N), which provides more defect sites and enhances the catalytic activity, and (4) the porous walls of MOF and internal connected CNTs, which provide sufficient pathways for the fast diffusion of electrons and iodine ions. The present work not only strengthens the understanding of the coupling interaction between porous CoSe2@NC and CNTs, but also offers an extended strategy of structuring further well-defined metal-on-MOF hybrids.
研究领域:
材料科学
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能源技术
✓ 已验证
DOI
高影响因子
ECS Journal of Solid State Science and Technology
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2021
·Vol. 10
·期 4
·045012
·
IF 2.07
Wenhua Li,Meng Zheng,Zizun Tian,Guoqiang Long,Shule Zhang,Qianqiao Chen,Qin Zhong
Exploration of counter electrode (CE) catalysts with excellent reduction activity to Sn2− and low charge transfer resistance (Rct) is always a major challenge for the development of quantum dot sensitized solar cells. In this work, coral-like CoSe2 - nitrogen-doped porous carbon hydrides (CoSe2-NC) were successfully prepared by two-step calcination of zeolitic imidazolate framework (ZIF), including carbonization and selenization process. Scanning electron microscopy shows that the CoSe2-NC catalyst presents a coral-like microscopic morphology composed of nanospheres. Electrochemical impedance spectroscopy displays that the CoSe2-NC CE presents a low Rct of 1.04 Ω. The PCE of the QDSSC based CoSe2-NC CE is up to 5.06%，which is 26%, 87% higher than those of CoSe2 and NC CEs. The enhanced photovoltaic performance is attributed to the unique coral-like structure and the synergistic catalytic effect of CoSe2 and NC.
研究领域:
材料科学
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能源科学
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电化学
✓ 已验证
DOI
高影响因子
Journal of Energy Chemistry
·
2023
·
IF 13.1
Chuan Hu,Fengli Wei,Qinrui Liang,Qiming Peng,Yuting Yang,Tayirjan Taylor Isimjan,Xiulin Yang
The construction of oxide/metal composite catalysts is a competent means of exploiting the electronic interactions between oxide/metal to enhance catalytic activity. In this work, we construct a novel heterogeneous composite (Ru/HfO 2 -NC) with Ru/HfO 2 nanoparticles nested in nitrogen-doped porous carbon via a zeolitic imidazole frameworks-assisted (ZIF) co-precipitation and calcination approach. In particular, ZIF guides an in-situ construction of nested configuration and confines the scattered nanoparticles. Strikingly, Ru/HfO 2 -NC exhibits unusual ORR activity, superb durability, and methanol tolerance in 0.1 M KOH solution with high half-wave potential ( E 1/2 ) of 0.83 V and follows a near-4e − reaction pathway. Additionally, the ZAB assembled with cathodic Ru/HfO 2 -NC outputs a power density of 157.3 mW cm −2 , a specific capacity of 775 mA h g Z n - 1 , and a prolonged lifespan of 258 h at 5 mA cm −2 . Meanwhile, the catalyst has demonstrated potential applicability in flexible ZAB. As suggested by experimental results and density functional theory (DFT) analysis, the remarkable property possibly originated from the optimization of the adsorption and desorption of reactive intermediates caused by the reconfiguration of the electronic structure between Ru and HfO 2 .
研究领域:
材料科学
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电化学
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理论计算
✓ 已验证
产品关联
DOI
高影响因子
ACS Catalysis
·
2022
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IF 13.7
Yuting He,Xiaoxuan Yang,Yunsong Li,Liting Liu,Shengwu Guo,Chengyong Shu,Feng Liu,Yongning Liu,Qiang Tan,Gang Wu
Single-metal site catalysts have exhibited highly efficient electrocatalytic properties due to their unique coordination environments and adjustable local structures for reactant adsorption and electron transfer. They have been widely studied for many electrochemical reactions, including oxygen reduction reaction (ORR) and oxygen evolution reaction (OER). However, it remains a significant challenge to realize high-efficiency bifunctional catalysis (ORR/OER) with single-metal-type active sites. Herein, we report atomically dispersed Fe–Co dual metal sites (FeCo–NC) derived from Fe and Co co-doped zeolitic imidazolate frameworks (ZIF-8s), aiming to build up multiple active sites for bifunctional ORR/OER catalysts. The atomically dispersed FeCo–NC catalyst shows excellent bifunctional catalytic activity in alkaline media for the ORR (E1/2 = 0.877 V) and the OER (Ej=10 = 1.579 V). Moreover, its outstanding stability during the ORR and the OER is comparable to noble-metal catalysts (Pt/C and RuO2). The atomic dispersion state, coordination structure, and the charge density difference of the dual metal site FeCo–NC were characterized and determined using advanced physical characterization and density functional theory (DFT) calculations. The FeCo–N6 moieties are likely the main active sites simultaneously for the ORR and the OER with improved performance relative to the traditional single Fe and Co site catalysts. We further incorporated the FeCo–NC catalyst into an air electrode for fabricating rechargeable and flexible Zn–air batteries, generating a superior power density (372 mW cm–2) and long-cycle (over 190 h) stability. This work would provide a method to design and synthesize atomically dispersed multi-metal site catalysts for advanced electrocatalysis.
研究领域:
材料科学
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电化学
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能源存储与转换
✓ 已验证
产品关联
DOI
高影响因子
ANALYTICA CHIMICA ACTA
·
2023
·
IF 6.2
Qi Wang,Yongli Ding,Randy A. Dahlgren,Yue Sun,Jingjing Gu,Yuhao Li,Tingting Liu,Xuedong Wang
Total antioxidant capacity (TAC) can be evaluated by detecting the content of antioxidants , such as ascorbic acid , based on the enzyme-mimetic activity of nanomaterials . Herein, we fabricated a 3D-V 2 O 5 /NC nanocomposite using a self-templating strategy, which achieved ultrafine particles (∼2.5 nm), a porous carbon layer, large specific surface area (152.4 m 2 /g), N-doping and heterogeneous structure. The strong catalytic activity of 3D-V 2 O 5 /NC resulted from the integrated effect between the ultrafine structure of V 2 O 5 nanoparticles and the 3D porous nitrogen-doped carbon framework, effectively increasing the number of active sites. This nanozyme presented a higher catalytic activity than its components or precursors in the nanocomposite (e.g., VN/NC, NC, V 2 O 5 , and VO 2 /g-C 3 N 4 ). ROS scavenging experiments confirmed that the dual enzyme-like activity of 3D-V 2 O 5 /NC (catalase-like and oxidase-like) resulted from their co-participation of ‧O 2 − , h + and ‧OH, among which ‧O 2 − played a crucial role in the catalytic color reaction. By virtue of the 3D-V 2 O 5 /NC nanoenzyme activity and TMB as a chromogenic substrate, the mixed system of 3D-V 2 O 5 /NC + TMB + H 2 O 2 provided a low detection limit (0.03 μM) and suitable recovery (93.0–109.5%) for AA. Additionally, a smartphone-based colorimetric application was developed employing "Thing Identify" software to evaluate TAC in beverages. The colorimetric sensor and smartphone-detection platform provide a better or comparable analytical performance for TAC assessment in comparison to commercial ABTS test kits. The newly developed smartphone-based colorimetric platform presents several prominent advantageous, such as low cost, simple/rapid operation, and feasibility for outdoor use.
研究领域:
纳米材料科学
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生物化学
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分析化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Processes
·
2024
·Vol. 12
·期 12
·2670
·
IF 2.8
Ke-Hong Chen,Ao-Tian Gu,Liang Zhang,Hao Tang,Zhi-Ming Zhang,Yi-Ming Zhou,Yu-Qi Cheng,Yi Yang
Chloramphenicol antibiotics (CAPs) are broad-spectrum antibiotics, and excessive consumption has led to increasingly dangerous residues in the environment. The accumulation of these highly toxic and difficult-to-biodegrade CAPs and their long-term exposure in ecological environments can pose insidious and long-term hazards to human health and aquatic organisms. In this study, co-carbon composite nanocatalysts (CoxZn10−x-NC) with many carbon nanotubes on the surface were prepared via the one-step pyrolysis of bimetallic CoxZn10−x-ZIF with different Co/Zn ratios and used for the degradation of trace amounts of CAPs in a water column. The microstructure and chemical composition of the prepared catalysts were fully characterized using SEM, TEM, and XPS. The CAP degradation experiments demonstrated that Co6Zn4-NC in CoxZn10−x-NC possessed the highest catalytic activity level, removing 100% of the CAPs in 60 min. The CAPs had a corresponding reaction rate constant of 0.22 min−1, and Co6Zn4-NC was able to completely mineralize 44.57% of them. Doping moderate amounts of Zn can effectively improve the carbon nanotube structure on the catalyst surface and promote the generation of monoatomic Co, thus improving catalytic activity. The results of the free-radical burst experiments and electron paramagnetic resonance (EPR) showed that the free-radical pathway mainly dominated within the Co6Zn4-NC+PMS system, in which SO4•−was the main ROS for CAP degradation.
研究领域:
环境科学
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材料科学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2024
·
IF 9.4
Shunchao Wang,Sibing Xie,Man Zhang,Yongjie Jiang,Huwen Luo,Jun Tang,Fenghua Zheng,Qingyu Li,Hongqiang Wang,Qichang Pan
Metal sulfides (MSs) have attracted much attention as anode materials for sodium-ion batteries (SIBs) due to their high sodium storage capacity. However, the unsatisfactory electrochemical performance induced by the huge volume change and sluggish kinetics hampered the practical application of SIBs. Herein, guided by the heterostructure interface engineering, novel multicomponent metal sulfide-based anodes, including SnS, FeS, and Fe 3 N embedded in N -doped carbon nanosheets (SnS/FeS/Fe 3 N/NC NSs), have been synthesized for high-performance SIBs. The as-prepared SnS/FeS/Fe 3 N/NC NSs with abundant heterointerfaces and high conductivity of N -doped carbon nanosheet matrix can shorten the Na + diffusion path and promote reaction kinetics during the sodiation/desodiation process. Moreover, the presence of Fe 3 N can promote the reversible conversion of SnS and FeS during the cycling process. As a consequence, when evaluated as anode materials for SIBs, the SnS/FeS/Fe 3 N/NC NSs can maintain a high sodium storage capacity of 473.6 mAh g -1 after 600 cycles at 2.0 A g -1 and can still provide a high reversible capacity of 537.4 mAh g -1 even at 5.0 A g -1 This discovery offers a novel strategy for constructing metal sulfide-based anode materials for high-performance SIBs.
研究领域:
材料科学
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能源存储与转换
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Applied Nano Materials
·
2021
·
IF 5.097
Xiuxiu Sun,Ani Zhou,Shuzhen Li,Maoguo Li
On using magnetic Fe3O4 as the core of nitrogen-doped carbon (NC) matrix composite Fe3C (Fe3C/Fe3O4@NC), it not only shows good peroxide-like and oxidase-like properties but also has excellent Fenton-like degradability. Based on the Fenton-like properties of the core–shell nanocomposites, ciprofloxacin can be degraded by activated peroxo monosulfate. The magnetic core is easy to recover, and the shell has good catalytic performance. The degradation rate using Fe3C/Fe3O4@NC as the catalyst was 7.3 and 2.9 times that of Fe3O4 and Fe3O4@NC as catalysts, respectively, and the sulfate radical was found to be the main active species involved in the degradation. The actual performance of the catalyst was evaluated in simulated wastewater and different water sources. Inorganic anions slightly changed the degradation rate, while common organic compounds in wastewater reduced the degradation rate. The composite materials have excellent catalytic performance, good magnetic response, and repeatability, which are conducive to practical application in wastewater treatment process.
研究领域:
环境科学
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催化材料
✓ 已验证
产品关联
DOI
高影响因子
Chemical Engineering Journal Advances
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2021
·
IF 0
Haidong Liu,Jingrui Shang,Lingjian Zeng,Binbin Cao,Hongbo Geng,Jianping Lang,Xueqin Cao,Hongwei Gu
Developing stable, efficient and economical electrocatalytic materials is still challenging for hydrogen evolution reaction (HER). Hence, we develop a Pd/Ni bimetallic carbon electrocatalyst (Pd/Ni-NC) with outstanding electrocatalytic performance. The catalyst derived from Pd-doped Ni-MOF (Pd/Ni-MOF) has particles and needle-like carbon tubes on its surface and is similar in shape to setaria. Benefiting from the composition and the unique structure, Pd/Ni-NC shows excellent HER catalytic performance with 16 mV at 10 mA cm −2 , superior to Pd or Ni single metal-carbon catalyst. Furthermore, it maintains stable catalytic activity under constant current for 25h. These results show the strategy that obtaining Pd and Ni bimetallic MOF by cation exchange and its corresponding bimetallic carbon material with setaria-shaped structure by calcination is powerful for high efficient HER performance.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2026
·
IF 9.2
Zeming Yuan,Yize Sun,Chenxu Liu,Tingting Zhai,Xia Li,Zhonggang Han,Yanghuan Zhang
A novel catalyst of Ni/CeVO 4- x @NC (nano carbon) was prepared via the coprecipitation-reduction method and then ball-milled with MgH 2 . During the precipitation process, elemental Ni was formed in situ. The catalyst was characterized to have a multiphase structure, with CeVO 3 as the main phase coexisting with the CeVO 4 phase; the latter contains abundant oxygen vacancies (denoted as CeVO 4- x ). Oxygen vacancy defects facilitate the efficient dissociation of MgH 2 and exert a synergistic catalytic effect with metallic Ni, as well as multivalent Ce and V species. The MgH 2 + 4 wt% Ni/CeVO 4- x @NC composite absorbs 5.36 wt% H 2 within 2 min at 553 K and releases 5.71 wt% H 2 within 78 min. This composite exhibits an initial hydrogen desorption temperature of 465 K, which contributes to the reduction of MgH 2 's thermodynamic stability. First-principles calculations were performed on the MgH 2 + Ni/CeVO 3 @NC model, encompassing the states of the composite both before and after hydrogen absorption and desorption. It was found that the introduction of metallic Ni provides additional quantum states and active sites for electron migration, thereby enhancing the electron transfer capability of the composite surface.
✓ 已验证
DOI
高影响因子
Materials Today Communications
·
2024
·
IF 3.7
Hao Peng,Xiaolan Song,Yi Wang,Zhipeng Cheng,Chongwei An
The nano-boron powder (n-B) exhibits remarkable efficacy as a combustion catalyst, making it a prime candidate for use in solid propellant metal burners. Nevertheless, throughout the storage phase, the surface of n-B powder is prone to oxidation and substantial agglomeration, resulting in challenges with ignition and incomplete energy dissipation when utilizing boron powder. In this study, we utilized the coaxial electrospinning technique to produce nanofibers comprised of nano-boron /nitrocellulose/ammonium perchlorate@fluororubber (n-B/NC/AP@F 2602 ), with the nano boron uniformly distributed within the core-shell fibers. In the course of combustion, the fibrous composite of n-B/NC/AP@F 2602 undergoes an escalation in the rates of energy output and energy release, owing to the constraints imposed by external F 2602 ((C₂H₂F₂) n and (C₃F₆) n ). The n-B/NC/AP@F 2602 demonstrates a 1.4-fold increase in peak pressure and a 3.6-fold increase in maximum boost rate when compared to the n-B/NC/AP. The energy performance evaluation results reveal that the mean molecular weight (MC) of combusted products from n-B/NC/AP@F 2602 is 29.2 g·mol −1 , representing a substantial increase compared to that of n-B/NC/AP. The aforementioned findings exemplify that coaxial electrospinning is an exceedingly efficacious technique for enhancing nanostructures, thereby amplifying the reactivity of energetic particles and offering novel insights into their application in energetic materials.
研究领域:
材料科学
·
燃烧与推进
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2021
·Vol. 56
·期 16
·10030-10040
·
IF 4.22
Zhang Xinzhe,Yu Zuoyang,Wang Changle,Gong Yuanyuan,Ai Bing,Zhang Lipeng,Wang Jie
Lithium–sulfur (Li–S) batteries have attracted much attention because of their high theoretical capacity and energy density and the advantages of sulfur, such as its low price, abundant reserves, low toxicity, and environmental friendliness. Li–S batteries are considered one of the most promising energy storage devices but suffer from shortcomings, such as their rapid capacity decay, short cycle life, and low Coulomb efficiency. We designed and prepared a new type of sulfur cathode material (NC@CoP–Co 3 O 4 ) that consisted of a CoP–Co 3 O 4 heterojunction uniformly distributed on the surface of hollow nitrogen-doped carbon tubes to overcome these problems. The NC@CoP–Co 3 O 4 hybrid nanocomposite can provide excellent electrical conductivity and effectively suppress the shuttle effect through the synergetic effect of physical confinement and chemical bonding. As a result, the Li–S battery maintained a capacity of 476 mAh g −1 at 700 cycles at 1 C and a long-term cycle stability of 70.3% after 700 cycles with an average capacity decay rate of only 0.057% per cycle.
研究领域:
材料科学
·
能源存储技术
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）