RSC Advances
·
2014
·Vol. 4
·期 74
·39312-39315
·
IF 3.708
Yanqing Lai,Fuhua Yang,Zhian Zhang,Shaofeng Jiang,Jie Li
Porous hollow carbon spheres (PHCSs) with high surface area and large pore volume were synthesised using a facile template method. After selenium (Se) encapsulation, Se/PHCS composite was formed. The obtained Se/PHCS composite was demonstrated as a suitable cathode material for lithium–selenium batteries.
研究领域:
材料科学
·
能源存储
✓ 已验证
产品关联
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2019
·
IF 5.383
Jianzhi Huang,Xinrong Guo,Xinjian Huang,Lishi Wang
Herein, mesoporous hollow kapok-tubes (denoted as MHKTs) is first used as carbon electrocatalyst for CO 2 electroreduction that can selectively convert CO 2 to formate without doping active elements, achieving the highest Faradaic Efficiency (FE) for formate at a potential range from −1.0 to −1.1 V vs. RHE (E = −1.0 V, FE = 48%; E = −1.1 V, FE = 50%). Moreover, MHKTs is also first used as new carbon support for loading metals in CO 2 electroreduction, metals (Sn, Bi, Pb and Cd) in-situ anchored on MHKTs are all prepared via in-situ simple one-pot synthetic strategy. The four electrocatalysts Sn@MHKTs (E = −0.9 V, FE = 94%; E = −1.0 V, FE = 95%; E = −1.1 V, FE = 90%), Bi@MHKTs (E = −0.9 V, FE = 90.5%; E = −1.0 V, FE = 93%; E = −1.1 V, FE = 92%), Pb@MHKTs (E = −1.0 V, FE = 85%; E = −1.1 V, FE = 80%) and Cd@MHKTs (E = −0.9 V, FE = 71%; E = −1.0 V, FE = 74%; E = −1.1 V, FE = 70%) all exhibit high selectivity for electrocatalytic CO 2 to formate at a wide potential range with low overpotential and high current density , respectively outperforming electrocatalysts synthesized under the same conditions that use traditional MWCNTs and rGO as carbon support (Sn@MWCNTs, Bi@MWCNTs, Pb@MWCNTs, Cd@MWCNTs; Sn@rGO, Bi@rGO, Pb@rGO, Cd@rGO). These outstanding performances of low cost metal@MHKTs electrocatalysts display great potential for large-scale using in CO 2 -to-formate process.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
CHEMOSPHERE
·
2021
·
IF 7.086
Shangying Zhang,Fengna Dai,Zhao Ke,Qi Wang,Chunhai Chen,Guangtao Qian,Youhai Yu
Herein, we obtained porous hollow carboxyl-polysulfone (PH-CPSF) microspheres through non-solvent-induced phase separation (NIPS) method and simple modification, used as highly efficient adsorbents for removing cationic dyes from sewage. The resulting PH-CPSF microspheres possess a hollow core and sponge-like shell structure, with high surface area, durable chemical inertness and structural stability. The as-synthesized PH-CPSF microspheres deliver a desirable adsorption effect after deprotonation treatment, with an adsorption capacity reaching up to 154.5 mg g −1 at 25 °C (pH = 7) of methylene blue (MB). The inter-molecular interactions between MB and the surface of the PH-CPSF, including π-π interaction, hydrogen bonding, strong charge attraction and weak charge attraction endow the adsorption ability of the PH-CPSF. The pseudo-second-order kinetic model pronounces in the adsorption behavior, and the adsorption equilibrium data is fitted to the Langmuir model. Moreover, PH-CPSF microspheres can also be used as adsorption fillers for large-scale water purification , and a removal rate of 94.0% for MB can be achieved under a flow rate of 8000 L m −3 h −1 . The reusability of 95.3% removal effect for PH-CPSF microspheres after 20 consecutive cycles can be attained by a simple regeneration treatment. The adsorption efficiency of the PH-CPSF microspheres was evaluated by variety of cationic and anionic dyes, with high adsorption capacity toward cationic dyes (100%) and less than 10% toward anionic dyes. These results manifest that PH-CPSF microspheres are a potential adsorbent with long-term purification capabilities, which are expected to be used in small and large-scale sewage treatment .
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Materials Today Communications
·
2025
·
IF 4.5
Xiangxiang Fan,Yilin Xu,Yutian Chen,Chun Huang
Gas sensing performances of MOF-derived metal-oxide-semiconductor were significantly affected by structural collapse and self-agglomeration. To solve the problem, ZIF-67 derived Co 3 O 4 based on polystyrene sphere templates were prepared by room temperature precipitation and high temperature calcination. The prepared materials were characterized and analyzed by a variety of characterization methods. The results showed that the structure and dispersion of ZIF-67 derived Co 3 O 4 were affected by template concentration. The optimized ZIF-67 derived Co 3 O 4 showed a hollow porous polyhedral structure with the improved integrity, dispersion and stability of structure. The BET results showed that the optimized hollow porous polyhedra had the larger specific surface area and richer pores. Because of the improved material properties, the gas sensing performances was also greatly enhanced. The response of the optimized ZIF-67 derived Co 3 O 4 to 10 ppm triethylamine was 6.72, while the response of ZIF-67 derived Co 3 O 4 without template was only 3.81. Compared with the sample without template, the response time of the optimized ZIF-67 derived Co 3 O 4 were shorter 27 s and the recovery time were shorter 154 s. Besides, the gas responses of the optimized sample with template showed a good stability and repeatability. The relative standard deviation of responses during 41 days was only 2.992 %. This work showed that the template-assisted growth is a promising way to enhance the structure and gas sensing properties of ZIF-67 derived Co 3 O 4 .
研究领域:
材料科学
·
传感器技术
✓ 已验证
产品关联
DOI
高影响因子
Nano Research
·
2018
·Vol. 11
·期 3
·1490-1499
·
IF 7.994
Du Haoran,Huang Kuangfu,Li Min,Xia Yuanyuan,Sun Yixuan,Yu Mengkang,Geng Baoyou
Porous hollow Co 3 O 4 microspheres have been synthesized from a mixed cobalt nitrate and urea solution through spray pyrolysis followed by calcination at 600 °C in air. This porous hollow Co 3 O 4 is assembled by nanoparticles and exhibits variable porosity depending on the amount of gas in the system. In pyrolysis process, urea continuously decomposes into gaseous components, which act as a template to control the porous structure. The amount of gas escaping from precursor droplets can directly influence the porosity of the microspheres and the size of the nanoparticles controlled by the ratio of urea to cobalt nitrate. Electrochemical measurements show that the performance of the porous hollow Co 3 O 4 microspheres is related to the porosity and size of the nanoparticles. The sample with optimal porosity delivers a high first charge capacity of 1,417.9 mAh·g −1 at 0.2C (1C = 890 mA·g −1 ), and superior charge cycle performance of 1,012.7 mAh·g −1 after 100 cycles. In addition, the optimized material displays satisfactory rate performance of 1,012.4 mAh·g −1 at 1C after 50 cycles and 881.3 mAh·g −1 at 2C after 300 cycles. Superior charge/discharge capacity, excellent rate performance and high yield achieved in this study is promising for the development of high-performance Co 3 O 4 anode materials for lithium-ion batteries.
研究领域:
材料科学
·
能源存储技术
✓ 已验证
产品关联
DOI
高影响因子
Smart Medicine
·
2024
·
IF 0
Wanyue Zhang,Lijun Cai,Jingjing Gan,Yuanjin Zhao
Chinese medicine is identified as a candidate for wound healing. Attempts in this field tend to develop efficient dosage forms for delivering Chinese medicine with low side effects. In this paper, we proposed novel photothermal responsive porous hollow microneedles (PRPH-MNs) as a versatile Chinese medicine delivery system for efficient antibacterial wound treatment. The PRPH-MNs are composed of porous resin shells with good mechanical property, hydrogel cores, and a photothermal graphene oxide hybrid substrate. The hollow structure provides sufficient space for loading the drug dispersed hydrogel, while the porous resin shells could not only block the direct contact between drugs and wound sites but also provide channels for facilitating the drug release from the core. In addition, benefiting from the photothermal effect of their substrate, the PRPH-MNs could be heated under near-infrared (NIR) irradiation for controllable promotion of drug release. Based on these features, we have proved that the antibacterial Chinese medicine Rhein loaded PRPH-MNs were effective in promoting wound healing due to their good antibacterial property and on-demand drug release. Thus, we believe that the proposed PRPH-MNs are valuable for delivery of different drugs for clinical applications.
研究领域:
药剂学
·
生物医学工程
·
中医药学
·
材料科学
✓ 已验证
DOI
FUEL
·
2024
·
IF 6.7
Yingxiu Zhao,Ping Zhao,Wen Zhang,Xinyuan Zhou,Qiong Zhang,Yu Miao,Guang-Rui Xu,Lei Wang
Pt-based electrocatalysts are the most efficient materials for oxygen reduction reaction (ORR) due to the unfilled d orbitals while suffering from poor selectivity and durability during the 4e - pathway. Herein, we reported a high-performance electrocatalyst of porous hollow carbon nanosphere encapsulated inside with PtCo alloy nanorods (PtCo@PHCNS). Specifically, the PtCo alloy nanorods with a diameter of 6 nm show a nanorod structure, and the hollow carbon nanospheres with a diameter of 400 nm and a wall thickness of 65 nm show a porous structure. Strikingly, the electrochemistry shows that PtCo@PHCNS displays the ORR onset potential ( E onset ) and the half-wave potential ( E 1/2 ) are 0.975 V vs. RHE and 0.885 V vs. RHE under alkaline conditions, respectively. Specifically, PtCo@PHCNS shows enhanced ORR selectivity and durability that originate from the void-confinement effects of porous hollow carbon nanosphere. The strategy describes novel protection with porous carbon materials and obtains a unique electrocatalysis PtCo@PHCNS, providing a promising way for designing and synthesizing high-performance 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
Surfaces and Interfaces
·
2024
·
IF 5.7
Jun Han,Fangzhou Wu,Zhongwei wang,Yan Gao,Bin Dai,Wei Wang
The performance of the photocatalysts is influenced by factors such as electron generation ability, charge separation rate, and active sites distribution. In this study, needle-shaped precursors were prepared through low-temperature supramolecular self-assembly, and conical porous hollow carbon nitride (PHCN) was obtained after high-temperature pyrolysis. The PHCN not only possesses a thin-walled porous structure but also contains nitrogen defects embedded in its structure, which synergistically enhance the efficiency of photogenerated charge separation and provide more reactive sites. The DFT calculations showed that nitrogen defects and Pt-loading synergistically optimize the intermediate reaction process of graphitic carbon nitride (g-C 3 N 4 ). PHCN had excellent photocatalytic degradation of tetracycline hydrochloride (TCH) and Rhodamine B (Rh B). The photocatalytic hydrogen evolution rate of PHCN was 20.0 times higher than that of bulk g-C 3 N 4 (BCN). This study elucidated the relationship between crystallization rate and precursor morphology, as well as the influence of their physicochemical properties on photocatalytic performance. It also lays the foundation for constructing materials with nitrogen defects and special morphology through supramolecular self-assembly.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2024
·Vol. 59
·期 15
·6270-6284
·
IF 3.5
Wu Hongmei,Liu Baoshan,Zhang Yao,Li Feng,Liu Jing,Zhao Liping,Zhang Peng,Gao Lian
Cobalt-based transition metal phosphides (TMPs) exhibit huge potential as efficient OER electrocatalysts for commercial applications. Zeolitic imidazolate framework-67 (ZIF-67) has been served as an appealing precursor for the synthesis of cobalt-based TMPs owing to its distinctive structural advantages. However, the poor conductivity and structural variability of ZIF-67 affect the materials’ OER electrocatalytic performance. To enhance the structural stability and OER performance of ZIF-67 derived TMPs, in this work, a polyhedral TMP nanocomposite with porous hollow structure, featuring Fe-CoP on the outer shell and CoP nanoparticles within the cavity, was synthesized using ZIF-67 as template. The ZIF-67 served as both Co precursor and structure template, and the [Fe(CN) 6 ] 3− served as precursor of Fe dopant and structure stabilizer. The resulting TMP composite electrode (Fe-CoP) effectively retains the framework of ZIF-67, exhibiting prominently improved OER activity (η 10 = 297 mV) and exceptional stability (over 260 h). The Fe–C≡N–Co bonds positively influence the preservation of the sample’s morphology after phosphorization. Additionally, a ligand-substitution strategy is proposed for the formation of the designed structure. This strategy, regulating the morphology of 3D structured MOFs, offers a new understanding on stabilizing the geometric structure of MOFs and their derivatives as structure templates. Graphical abstract
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 POWER SOURCES
·
2014
·
IF 5.211
Wei Yu,Xinbing Jiang,Shujiang Ding,Ben Q. Li
Porous hollow nanospheres (or spherical shells) made of NiO nanosheets are synthesized and tested for the electrochemical performance of the electrodes made of these materials for supercapacitors. Preparation of the NiO sheet hollow spheres starts with synthesis of polystyrene nanospheres with carboxyl groups (CPS), followed by a two-step activation procedure and the subsequent nucleation and growth by electroless deposition of Ni on the CPS core to obtain CPS@Ni core–shell nanoparticles. The CPS core is eliminated and metallic Ni nanoshell is converted into NiO by calcinations at high temperatures. The material properties of as-prepared hollow NiO nanospheres are characterized by TEM, XRD and N 2 -absorption measurements. The electrochemical characteristics of the electrodes made of these nanostructured NiO materials are determined by the CV and galvanostatic measurements. These electrochemical tests indicate that electrodes made of the NiO nanosheet hollow spheres exhibit an improved reversible capacitance of 600 F g −1 after 1000 cycles at a high current density of 10 A g −1 . It is believed that the good electrochemical performance of these electrodes is attributed to the improved OH − transport in the porous network structures associated with the hollow spheres of randomly oriented NiO nanosheets.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2016
·
IF 3.15
Shanshan Zhao,Tingting Yan,Hui Wang,Guorong Chen,Lei Huang,Jianping Zhang,Liyi Shi,Dengsong Zhang
In this work, nitrogen-doped porous hollow carbon spheres (N-PHCS) were well prepared by using polystyrene (PS) spheres as hard templates and dopamine hydrochloride as carbon and nitrogen sources. Field emission scanning electron microscopy (SEM) and transmission electron microscopy (TEM) images demonstrate that the N-PHCS have a uniform, spherical and hollow structure. Nitrogen adsorption–desorption analysis shows that the N-PHCS have a high specific area of 512 m 2 /g. X-ray photoelectron spectroscopy result reveals that the nitrogen doping amount is 2.92%. The hollow and porous structure and effective nitrogen doping can contribute to large accessible surface area, efficient ion transport and good conductivity. In the electrochemical tests, we can conclude that the N-PHCS have a high specific capacitance value, a good stability and low inner resistance. The N-PHCS electrodes present a high salt adsorption capacity of 12.95 mg/g at a cell voltage of 1.4 V with a flow rate of 40 mL/min in a 500 mg/L NaCl aqueous solution. Moreover, the N-PHCS electrodes show high salt adsorption rate and good regeneration performance in the CDI process. With high surface specific area and effective nitrogen doping, the N-PHCS is promising to the CDI and other electrochemical applications.
研究领域:
材料科学
·
环境工程
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
Small
·
2021
·Vol. 17
·期 38
·2101857
·
IF 13.281
Wei Chang,Jin Qu,Wei Li,Yu-Hao Liu,Xian-Zhi Zhai,Hong-Jun Liu,Yu Kang,Zhong-Zhen Yu
Although organosulfur compounds can protect lithium anodes, participate in the redox reaction, and suppress the shuttle effect, the sluggish electrochemical dynamics of their bulk structure and the notorious shuttle effect of covalent long-chain sulfurs largely impede their actual applications. Herein, sulfurized carbon nanotube@aminophenol-formaldehyde (SC@A) with covalently linked short-chain sulfurs is firstly synthesized by in situ polymerization of aminophenol-formaldehyde (AF) on the surface of carbon nanotubes (CNTs) followed by acetone etching and inverse sulfurization processes, forming mesoporous yolk-shell organosulfur nanotubes with abundant internal joints between the yolk of CNTs and the shell of sulfurized AF for the first time. In situ Raman spectra, in situ XRD patterns, and ex situ XPS spectra verify that the covalent short-chain sulfurs bring about a reversible solid-solid conversion process of sulfur, thoroughly avoiding the shuttle effect. The mesoporous yolk-shell structure with abundant internal joints can effectively accommodate the volume change, fully expose active sites and efficiently improve the transport of electrons and lithium ions, thus highly promoting the solid–solid electrochemical reaction kinetics. Therefore, the SC@A cathode exhibits a superior specific capacity of 841 mAh g −1 and a capacity decay of 0.06% per cycle within 500 cycles at a large current density of 5.0 C.
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
危险品化学品经营许可证（带存储）