Catalysts
·
2019
·Vol. 9
·期 1
·102
·
IF 3.444
Yuzhe Wu,Yuntong Li,Jie Mao,Haiyang Wu,Tong Wu,Yaying Li,Birong Zeng,Yiting Xu,Conghui Yuan,Lizong Dai
Heteroatom-doped carbon materials have been extensively studied in the field of electrochemical catalysis to solve the challenges of energy shortage. In particular, there is vigorous research activity in the design of multi-element co-doped carbon materials for the improvement of electrochemical performance. Herein, we developed a supramolecular approach to construct metallosupramolecular polymer hollow spheres, which could be used as precursors for the generation of carbon shells co-doped with B, N, F and Fe elements. The metallosupramolecular polymer hollow spheres were fabricated through a simple route based on the Kirkendall effect. The in situ reaction between the boronate polymer spheres and Fe3+could easily control the component and shell thickness of the precursors. The as-prepared multi-element co-doped carbon shells showed excellent catalytic activity in an oxygen reduction reaction, with onset potential (Eonset) 0.91 V and half-wave (Ehalf-wave) 0.82 V vs reversible hydrogen electrode (RHE). The fluorine element in the carbon matrix was important for the improvement of oxygen reduction reaction (ORR) activity performance through designing the control experiment. This supramolecular approach may afford a new route to explore good activity and a low-cost catalyst for ORR.Keywords:carbon shell;metallosupramolecular polymer;hollow particles;doping;oxygen reduction reaction
研究领域:
材料科学
·
电化学催化
✓ 已验证
产品关联
DOI
高影响因子
Journal of Surface Investigation
·
2019
·Vol. 13
·期 6
·1192-1198
·
IF 0
Neshchimenko V. V.,Mikhailov M. M.
The reflectance spectra of ZnO, TiO 2 , and SiO 2 micro-, nano-, and hollow powders after their exposure to 100-keV protons are analyzed at wavelengths between 250 to 2500 nm. The hollow particles are up to 5 μm in size with a specific surface area of 32 to 57 m 2 /g. It is established that hollow particles have a greater radiation stability to proton exposure than microcrystal particles. The effect is due to the absence of radiation-induced defects in the volume of the spherical particles, low ionization losses, and a high ability to relax radiation-induced defects in the thin layer of the sphere.
研究领域:
材料科学
·
光学
·
辐射物理
·
纳米技术
✓ 已验证
DOI
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2018
·
IF 5.091
Hongbin Hou,Liping Zhang,Tianmeng Liu,Junmei Cheng,LiQi Sun,Chengdong Wang,Miaomiao Jin,Zhanxin Song,Jingyun Cheng,Qinggang Wang,Hongguang Sun,Xiao Chen,Guanglei Cui
Double-shell hollow particles (DSHPs) have attracted significant attention due to their diverse potential applications. DSHPs are usually obtained by multi-step sacrificial template method which is tedious and inefficient. In this work, a facile synthesis of silica DSHPs has been developed via a novel one-step template method, which is using single-hole hollow particles (SHHPs) as the templates. The shapes and internal structures of the DSHPs were determined by SEM and TEM , and the average diameters of inner and outer shells were about 0.6 and 1.6 μm, respectively. According to FTIR analyses, the compositions of silica DSHPs were identified as well. Furthermore, the silica DSHPs was applied to Li-ion batteries as a modifier of gel polymer electrolyte (GPEs), and the results showed that the gel composite electrolytes (GCEs) could display higher capability, higher ionic conductivity and better rate performance at high current density for GCEs-cell. Properties of the silica DSHPs such as larger specific surface area, more porous structures and Lewis acid-base effect were important for high-performance Li-ion batteries.
研究领域:
材料科学
·
能源科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Royal Society Open Science
·
2021
·Vol. 8
·期 1
·
IF 2.963
Chao Chen,Xiaoxin Zhang,Hao Huang,Hongyi Bao,Xiaodong Li,Ye Cheng,Jing Zhang,Yin Ding,Yanguang Yang,Haiying Gu,Donglin Xia
Oxidative stress has been implicated in the pathogenesis of cognitive impairment. Lead (Pb) is a common environmental toxicant and plays a vital role in oxidative stress activation. In this study, a superoxide dismutase (SOD) and catalase (CAT) containing poly (lactic-co-glycolic acid) (PLGA) meso-particles (PLGA@SOD-CAT) were prepared to attenuate cognitive impairment via inhibiting oxidative stress in rats. It was prepared using a double emulsion (water/oil/water phase) technique to minimize the hazardous effects of Pb burden on cognitive impairment. The meso-particles antagonized the Pb-induced cognitive impairments. Behaviour, serum biochemical parameters and biomarkers of oxidative stress in rats were evaluated after they were subjected to intravenous injection with lead nitrate and PLGA@SOD-CAT. Moreover, the potential protective mechanism of PLGA@SOD-CAT was determined. Notably, PLGA@SOD-CAT appreciably agented memory impairment caused by lead nitrate and it could significantly inhibit Pb-induced oxidative stress in the blood. Furthermore, a remarkable reversion effect of cognitive impairments, including escape latency, crossing platform times and time per cent during the platform quadrant, after PLGA@SOD-CAT administration were noted. Therefore, these results suggested that the bi-enzymes platform was a superior product in eliminating Pb-induced cognitive impairments through reducing expression of Pb-associated oxidative stress, and it could potentially be applied in detoxifying heavy metals in blood circulation.
研究领域:
药理学
·
毒理学
·
神经科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Small
·
2022
·Vol. 18
·期 33
·2203148
·
IF 15.153
Tong Wu,Yaying Li,Jing Hong,Liu He,Jie Mao,Xiaoling Wu,Xiangfu Zhou,Peixin Zeng,Birong Zeng,Yiting Xu,Weiang Luo,Guorong Chen,Conghui Yuan,Lizong Dai
Metallopolymers combine the property features of both metallic compounds and organic polymers, representing a typical direction for the design of high-performance hybrid materials. Here, a highly adaptive etching method to create pores and cavities in the metallopolymer particles is established. Starting from boronate polymer (BP) and inorganic@BP core–shell particles, porous, hollow, and yolk–shell metallopolymer particles can be fabricated, respectively. By taking advantage of the easy control over composition and pore/cavity structure, these metallopolymer particles provide a universal platform for the fabrication of nitrogen, boron co-doped carbon nanocomposites loaded with metals (M-NBCs). The as-prepared M-NBCs exhibit remarkable catalytic activities toward oxygen evolution reaction and hydrogen evolution reaction. An alkaline overall water splitting cell assembled by using M-NBCs as the anode and cathode can be driven by a single AAA battery. The proposed strategy for the construction of metallopolymer composites may enlighten for the design of complex hybrid nanomaterials.
研究领域:
材料科学
·
化学工程
·
催化
·
纳米技术
✓ 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）