JOURNAL OF ALLOYS AND COMPOUNDS
·
2024
·
IF 5.8
Jun Han,Junhui Shao,Xingchen He,Najun Li,Shuxian Wang,Dongyun Chen,Jianmei Lu
Constructing heterojunctions has been proved to effectively improve the carrier transfer capability for enhanced catalytic activity. Herein, Ti 3 C 2 /BaTiO 3 heterojunctions were fabricated through self-assembly driven by hydrogen bonding between piezoelectric barium titanate (BaTiO 3 ) stabilized by oleic acid molecules and titanium carbide (Ti 3 C 2 ) with surficial functional groups under continuous ultrasonic vibration. Owing to the formation of heterojunction, the separation of free charges can be promoted by the conductive Ti 3 C 2 . Additionally, the recombination of electrons and holes pairs in BaTiO 3 can be hindered by built-in piezoelectric field. Hence, the piezocatalytic activity of Ti 3 C 2 /BaTiO 3 was significantly enhanced by the accumulated piezoelectric effect, maintaining stability during the piezocatalytic degradation of bisphenol A and achieving rate constants that were 22.2 and 3.2 times higher than those of Ti 3 C 2 and BaTiO 3 , respectively. This work thus presents a novel strategy for designing high-activity heterojunction piezocatalysts through hydrogen bonding self-assembly.
研究领域:
材料科学
·
催化化学
✓ 已验证
产品关联
DOI
高影响因子
Reaction Kinetics Mechanisms and Catalysis
·
2024
·
IF 1.7
Sun Min,Chu Siyu,Lv Denghong,Li Bin,Kang Liping
In order to promote the application of carbon dots as carriers in oxygen reduction reaction, CD with uniform size distribution was prepared by microwave heating using citric acid and urea as raw materials through a bottom-up synthesis method. Due to the presence of a large number of hydroxyl groups on the surface of CD. We found that the prepared CD can be used as a reducing agent and stabilizer to directly reduce PdCl 2 to obtain Pd nanoparticles under oil bath conditions. The obtained Pd/CD system has excellent catalytic effect on the electrocatalytic oxygen reduction. The results show that the half-wave potential of Pd/CD-0.1 catalyst reaches 0.83 V, which is comparable to that of commercial Pd/C, and the corresponding limiting diffusion current density is even larger than that of commercial Pd/C catalyst. After a 5000 cycles stability test, the LSV exhibits a left shift of only 19 mV.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
Nanomaterials and Nanotechnology
·
2022
·
IF 3.28
Gai Zhang,Yufan Zhang,Amin Tan,Hongwei Zhou,Weifeng Zhao,Weixing Chen
Dinuclear metallophthalocyanines Fe2Pc2(CP)4 containing carboxyl substitutes were wrapped with amino-functionalized carbon nanotubes (MWCNTs-NH2) to enhance electrocatalytic activity for oxygen reduction reaction (ORR) using a facile “in situ” amidation reaction. The morphological characteristics and chemical environment of the Fe2Pc2(CP)4/MWCNTs-NH2 composites were characterized by scanning electron microscope (SEM), X-ray diffraction, Ultraviolet–visible (UV-Vis), Fourier Transform infrared (FTIR), and X-ray photoelectron spectroscopy. The electrocatalytic activity of ORR was tested and analyzed by cyclic voltammetry and linear sweep voltammetry. The results showed that the π–π interactions between the Fe2Pc2(CP)4 and MWCNTs-NH2 dramatically enhanced the π electron density in the conjugated structure, and oxygen could be reduced much more easily. Moreover, the oxygen reduction reactions mainly proceeded a one-step four electron process for Fe2Pc2(CP)4/MWCNTs-NH2 catalysts. The dispersion and electrocatalytic performance of M2Pc2Rn had be enhanced after being loaded on functionalized carbon nanotubes.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
Inorganic Chemistry Frontiers
·
2018
·Vol. 5
·期 5
·1121-1125
·
IF 5.106
Luhong Fu,Xiang Zeng,Chaozhang Huang,Ping Cai,Gongzhen Cheng,Wei Luo
The exploration of highly active catalysts with superior stability for overall water splitting has received considerable attention. Although intensive efforts have been made to design numerous electrocatalysts for water splitting in alkaline media, only a few electrocatalysts have been developed for proton exchange membrane (PEM)-based electrolyzers in acidic media. Herein, we report a colloidal synthesis of well dispersed ultrasmall Ir NPs with narrow size distribution, of superior catalytic activity and stability toward HER and OER in acidic media. When further used as both an anode and a cathode for acidic overall water splitting, the as-synthesized monodisperse Ir NPs yield a current density of 10 mA cm−2 at 1.58 V with long-term stability.
研究领域:
材料科学
·
电化学
·
能源转换
✓ 已验证
DOI
高影响因子
Inorganic Chemistry Frontiers
·
2020
·Vol. 7
·期 19
·3588-3597
·
IF 5.958
Yuqi Liu,Yue Yu,Zhongcheng Mu,Yuanhong Wang,Usman Ali,Shengyu Jing,Shuangxi Xing
The design and synthesis of non-precious metal-based bifunctional electrocatalysts with low cost and high performance for hydrogen and oxygen evolution in water are of great importance for renewable energy. Transition metal sulfides have attracted extensive interest owing to their easily adjustable electronic structures and rich chemical properties. Herein, the growth of MoS2–Ni3S2 on a nickel foam (MoS2–Ni3S2/NF) surface is investigated in the presence of urea, which can tune the morphology, surface electronic state and surface hydroxyl content of the product. The MoS2–Ni3S2/NF with optimal urea content shows remarkable electrocatalytic activity to hydrogen and oxygen evolution reactions with the corresponding overpotential at 100 mA cm−2 of only 181 mV and 355 mV, respectively. Upon using the product as a bifunctional electrocatalyst for overall water splitting, an overvoltage as low as 1.56 V is required and the stability is excellent for more than 80 000 s at 10 mA cm−2.
研究领域:
材料科学
·
能源化学
✓ 已验证
DOI
高影响因子
ACS Nano
·
2017
·
IF 13.942
Qun Li,Xianfu Wang,Kai Tang,Mengfan Wang,Chao Wang,Chenglin Yan
Cu-based electrocatalysts have seldom been studied for water oxidation because of their inferior activity and poor stability regardless of their low cost and environmentally benign nature. Therefore, exploring an efficient way to improve the activity of Cu-based electrocatalysts is very important for their practical application. Modifying electronic structure of the electrocatalytically active center of electrocatalysts by metal doping to favor the electron transfer between catalyst active sites and electrode is an important approach to optimize hydrogen and oxygen species adsorption energy, thus leading to the enhanced intrinsic electrocatalytic activity. Herein, Co-doped Cu7S4 nanodisks were synthesized and investigated as highly efficient electrocatalyst for oxygen evolution reaction (OER) due to the optimized electronic structure of the active center. Density-functional theory (DFT) calculations reveal that Co-engineered Cu7S4 could accelerate electron transfer between Co and Cu sites, thus decrease the energy barriers of intermediates and products during OER, which are crucial for enhanced catalytic properties. As expected, Co-engineered Cu7S4 nanodisks exhibit a low overpotential of 270 mV to achieve current density of 10 mA cm–2 as well as decreased Tafel slope and enhanced turnover frequencies as compared to bare Cu7S4. This discovery not only provides low-cost and efficient Cu-based electrocatalyst by Co doping, but also exhibits an in-depth insight into the mechanism of the enhanced OER properties.
研究领域:
材料科学
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电化学
·
理论计算
✓ 已验证
DOI
PubMed
高影响因子
NANOTECHNOLOGY
·
2025
·Vol. 36
·期 14
·145601
·
IF 2.8
Xinyu Shi,Libo Deng,Lingna Sun,Qianling Zhang,Xiangzhong Ren,Yongliang Li
Manganese dioxide (MnO2) is recognized as a promising candidate for the oxygen evolution reaction (OER); however, its practical application is hindered by limited active sites and low electrical conductivity. Fluorine (F), known for its strong electron affinity and electronegativity, can modulate the surface electronic structure and physicochemical properties of catalysts. In this study, we synthesized MnO2 nanosheets and fluorine-doped MnO2 (F-MnO2) using simple hydrothermal and ion-exchange methods. We then assessed the influence of fluorine doping on the intrinsic OER activity and stability of these catalysts, as well as their underlying catalytic mechanisms. By manipulating the amount of fluorine introduced and the fluorination temperature, we explored the relationship between varying fluorine concentrations and OER performance. The experimental results show that F-MnO2 exhibits higher OER activity than pristine MnO2. At a current density of 10 mA cm–2, the overpotential required for F-MnO2 is merely 320 mV, substantially lower than that of pristine MnO2. This enhanced performance is ascribed to fluorine doping, which leads to an increased quantity of active Mn3+ centers and oxygen vacancies, along with an expanded electrochemically active surface area. Furthermore, F-MnO2 displays improved stability during the testing period. It maintains long-term stability for over 25 h, further corroborating the catalyst's excellent anti-oxidation and anti-corrosion properties in alkaline water electrolysis.
研究领域:
材料科学
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电化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Sustainable Chemistry & Engineering
·
2018
·
IF 6.14
Yajie Guo,Dong Guo,Feng Ye,Ke Wang,Zhongqi Shi,Xianjue Chen,Chuan Zhao
NiSe2 nanowire (NW) arrays grown on flexible carbon fiber paper (CFP) were synthesized, for the first time, through a novel thermal selenization method in vacuum instead of flowing inert gas. The ultrathin NiSe2 NWs uniformly cover the CFP, contributing to the large surface area and fast charge transportation. Desirably, this binder-free and hierarchical electrode shows favorable activity for hydrogen evolution reaction (HER). It only requires an overpotential of 172 mV to afford the current density of 100 mA cm–2 in 0.5 M H2SO4, corresponding to a low Tafel slope of 32.44 mV dec–1. After 1000 continuous cycles, the HER activity of NiSe2 NWs is well-maintained. Moreover, the current density remains unchanged in prolonged electrolysis, indicating an excellent durability of NiSe2 NWs. The novel preparation method described in this study could inspire future work on the synthesis of transition-metal dichalcogenides with high purity and ultrasmall nanostructure toward improved electrocatalytic activity.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
Catalysis Science & Technology
·
2017
·Vol. 7
·期 24
·5974-5981
·
IF 5.773
Jinliang Zhu,Shangli Huang,Julian Key,Shuangxi Nie,Shaojian Ma,Pei Kang Shen
Metal phosphides are of great recent interest as promoters to precious metal-driven catalytic oxidation of alcohols in direct alcohol fuel cells. In this work, a novel approach for facile and environmentally friendly synthesis of molybdenum phosphide (MoP) nanocrystals anchored on graphitized carbon is developed by one-step pyrolysis of a phosphorus-containing resin exchanged with Mo5+. A significant promotion effect of MoP on Pt in methanol electrooxidation is observed. The Pt–MoP/C catalyst exhibits ultrahigh electroactivity, and compared to commercial Pt/C, this catalyst reaches a −140 mV more negative onset potential and has 10 times the mass activity at 0.4 V vs. SCE and 5.1 times the peak mass activity. In addition, Pt–MoP/C has also excellent stability and CO tolerance, including a peak mass activity retention of 81.4% after 1000 cycles as compared to that of 51.6% on commercial Pt/C and a 140 mV more negative COad oxidation potential. The noteworthy promotion effect of MoP on Pt in methanol electrooxidation is also evaluated by theoretical calculations.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2020
·
IF 4.939
Sufeng Zhang,Ning Wei,Zijie Yao,Xinyu Zhao,Min Du,Qiusheng Zhou
Enhancing the catalytic activity of Co 3 O 4 electrocatalysts featuring abundant oxygen vacancies is required to enable their application in oxygen evolution reaction (OER). However, developing a harmless defect engineering strategy based on mild conditions to realize such an enhancement remains a challenge. Here, ultrathin Co 3 O 4 nanosheets with abundant oxygen vacancies were prepared through a simple two-step method comprising a hydrothermal process and pre-oxidation to study the catalytic activity of the nanosheets toward OER. The ultrathin sheet structure and the Co 3 O 4 nanosheets surface provide abundant active sites. The oxygen vacancy not only improves the catalyst activity, but also improves the electron transfer efficiency. These advantages make ultrathin Co 3 O 4 nanosheets with abundant oxygen vacancies an excellent electrocatalyst for oxygen evolution. In an alkaline medium , ultrathin Co 3 O 4 nanosheets exhibited excellent OER catalytic activity, with a small overpotential (367 mV for 10 mA/cm 2 ) and faster reaction kinetics (65 mV/dec).Moreover, the electrocatalyst still maintained 68% of its original catalytic activity after 24 h operation. This work provides an extensive and reliable method for the preparation of low-cost and highly efficient OER electrocatalysts.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2019
·
IF 6.361
Jianguo Yu,Dan Wei,Zhe Zheng,Wenjie Yu,Honghui Shen,Yuning Qu,Shuya Wen,Young-Uk Kwon,Yongnan Zhao
x%Pt-Naf-CV (Pt-Nafion-Cyclic Voltammetry) catalysts with homogeneously distributed platinum nanoparticles and ultra-low Pt loading are successfully synthesized by using a facile potential cycling approach. The as-synthesized 0.8%Pt-Naf-CV catalyst exhibits an enhanced electrocatalytic activity for hydrogen evolution reaction (HER) in 0.5 M H 2 SO 4 solution, which obtains a low overpotential of 34 mV at 10 mA cm −2 . The linear sweep voltammetry (LSV) curve of 0.8%Pt-Naf-CV catalyst is almost consistent with that of commercial Pt/C. However, the 0.8%Pt-Naf-CV catalyst displays a more excellent stability and durability in comparison with commercial Pt/C. Besides, the Pt loading of Pt/C (Pt–10 wt%) is about 10 times that of 0.8%Pt-Naf-CV catalyst. The improved electrocatalytic performances are derived from the synergistic effects of Pt and Nafion. The Nafion plays a significant role as a dispersant , carrier and structure directing agent on the morphology and size of the Pt catalyst. This result contributes a promising method to enhance the catalytic activity and reduce the amount of Pt.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ANALYTICAL AND BIOANALYTICAL CHEMISTRY
·
2018
·Vol. 410
·期 30
·7921-7929
·
IF 3.307
Huang Mujia,He Daiping,Wang Mingzhu,Jiang Ping
High electrical conductivity and more active sites exposure are crucial for improving the performance of electrocatalyst. Binary metal oxide nanoarray grown on conductive substrate offers a 3D self-supported electrode with a great promise in boosting its performance in enzyme-free glucose sensing. Here, NiMoO 4 nanosheet arrays anchored on carbon cloth (NiMoO 4 NSA/CC) was prepared via a simple hydrothermal synthesis and used as 3D self-supported electrode for enzyme-free glucose sensing. The morphology and composition of NiMoO 4 nanosheet have been characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), and transmission electron microscopy (TEM). The electrochemical results show that NiMoO 4 NSA/CC exhibits remarkable high catalytic activity towards glucose oxidation, with a wide linear response ranging from 1 μM to 0.9 mM, a high sensitivity of 4.13 mA/mM·cm 2 , and a low detection limit of 1 μM (S/ N = 3). The enhanced performance might be attributed to the merits of nanosheet arrays with large surface area, self-supported electrode with 3D open network, as well as bimetallic component with high conductivity. Furthermore, NiMoO 4 NSA/CC also shows good selectivity and reliability for glucose detection in human serum. This work offers a new pathway for the construction of enzyme-free glucose sensor with high performance.
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研究领域:
材料科学
·
分析化学
·
生物医学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）