JOURNAL OF ALLOYS AND COMPOUNDS
·
2019
·
IF 4.175
Liang Zhang,Xinyue Wang,Tingting Zhang,Chengzhan Liu,Dehua Li,Shuangxi Xing
Taking full advantage of both silver and nitrogen-doped carbon (N-C) with finely designed nanostructure is a great challenge in achieving excellent electrocatalysts for oxygen reduction reaction (ORR). The Janus nanostructure composed of Ag nanoparticles (NPs) and N-C with individual exposed surface meets this purpose quite well. This can be achieved via pyrolyzing the core-shell Ag@polypyrrole (Ag@PPy) with eccentric encapsulated structure, where the AgNPs locate away from the center of the PPy spheres. The as-synthesized Janus nanostructured Ag@N-C demonstrates comparable ORR activity to commercial Pt/C catalyst with an onset and half-wave potential of 0.955 V and 0.821 V vs. RHE, respectively, and a limited current density of 4.976 mA cm −2 at 0.365 V, and it also illustrates better stability and stronger methanol tolerance. The excellent ORR activity is largely attributed to the synergistic effect originating from the interaction between AgNPs and carbonized PPy half-shell, where the former one leads to a higher disordered degree in the carbon layer and the latter results in the positive shift of Ag 3 d binding energy to facilitate the active oxygen adsorption and keeps the AgNPs from aggregation to avoid activity losing.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2017
·
IF 6.065
Yan Cao,Zipeng Xing,Zhenzi Li,Xiaoyan Wu,Mengqiao Hu,Xu Yan,Qi Zhu,Shilin Yang,Wei Zhou
3D mesoporous black TiO 2-x /Ag nanosphere coupled with 2D g-C 3 N 4 sheet ternary heterojunctions are successfully fabricated through a facile evaporation-induced self-assembly (EISA) process and photodeposition method, followed by a mild calcination (350 °C) under an argon atmosphere after an in situ solid-state chemical reduction strategy. The resultant mesoporous black TiO 2-x /Ag/g-C 3 N 4 ternary heterojunctions with narrow band gap of ∼ 2.27 eV possess a relative high specific surface area of ∼ 100 m 2 g −1 , main pore size of 6.2 nm and the highest visible-light-driven photocatalytic property for degradation of methyl orange (97%) and methylene blue (99%). The apparent reaction rate constants (k) of mesoporous black TiO 2-x /Ag/g-C 3 N 4 for methyl orange and methylene blue are ∼ 9 and 11 times higher than that of pristine TiO 2 . The possible mechanism is proposed, and the excellent photocatalytic property can be ascribed to the introduction of Ti 3+ self-doping and g-C 3 N 4 , which favor the visible light absorption and the separation of electron-hole pairs, the surface plasma resonance effect of Ag nanoparticle, and the mesoporous networks offer more surface active sites.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
CATALYSIS COMMUNICATIONS
·
2016
·
IF 3.389
Yunfeng Zhu,Xiaoyan Li,Mingyuan Zhu
In this study, we present a simple but efficient photocatalyst of mesoporous graphitic carbon nitride (mpg-C 3 N 4 ) that can activate molecular O 2 to oxidize dibenzothiophene under visible light. The desulfurization rate of the simulated oil was 100% under optimal conditions at room temperature. Mpg-C 3 N 4 is characterized using transmission electron microscopy, nitrogen adsorption–desorption isotherm, and X-ray diffraction.
研究领域:
材料科学
·
环境化学
✓ 已验证
DOI
高影响因子
Inorganic Chemistry Frontiers
·
2024
·Vol. 12
·期 1
·217-230
·
IF 6.1
Jinggao Wu,Canyu Zhong,Xiaofan Chen,Jing Huang
Li3V2(PO4)3 (LVP) coated with N and S co-doped carbon (NSC) was investigated by DFT calculation, suggesting that NSC significantly enhances electronic conductivity and lowers the energy barrier to Li+ migration in comparison to LVP-embedded in pristine carbon. To experimentally confirm the theoretical prediction, three types of LVP particle embedded in N and S co-doped porous carbon (LVP@NSC) materials with various nitrogen and sulfur molar ratios (N : S = 1 : 1, 1 : 2 and 2 : 1) were prepared by a facile freeze-drying-assisted wet chemical route associated with a post-annealing process. When used as a cathode for a lithium-ion battery (LIB), the designed LVP@NSC with N : S = 1 : 2 exhibits outstanding high rate capacities of 124.4 and 107.85 mA h g−1, respectively, at 2 and 20 C in a voltage window of 3.0–4.3 V, and an ultralong cycling stability of 500 times at 20 C while retaining a reversible capacity of 100.22 mA h g−1, possibly due to its smallest charge transfer resistance and highest Li+ migration coefficient, which is in good agreement with the theoretical prediction. This work not only reveals the critical role of an interaction mechanism between NSC and LVP, but also offers great potential for high-energy density LIB applications.
研究领域:
材料科学
·
电化学
·
计算化学
✓ 已验证
DOI
高影响因子
Journal of Energy Chemistry
·
2024
·
IF 14
Yuwen Hu,Meilian Tu,Tuzhi Xiong,Yanxiang He,Muhammad Mushtaq,Hao Yang,Zeba Khanam,Yongchao Huang,Jianqiu Deng,M.-Sadeeq Balogun
Lattice-strain engineering has demonstrated its capability to influence the electronic structure and catalytic performance of electrocatalysts. Herein, we present a facile method for inducing thermal strain in cobalt/molybdenum nitride rod-shaped structures (denoted Co/Mo 2 N) via ammonia-assisted reduction, which effectively modulating the HER performance. The optimized Co/Mo 2 N-500, characterized by 3% tensile lattice strain, demonstrates exceptional HER activity with lower overpotentials of 140 mV and 184 mV at high current density of 1000 mA cm −2 in alkaline freshwater and seawater electrolytes, respectively. Co/Mo 2 N also exhibits excellent long-term durability even at a high current density of 300 mA cm −2 , surpassing its counterparts and benchmark Pt/C catalyst. Density functional theory calculations validate that the tensile strain optimizes the d -band states, water dissociation, and hydrogen adsorption kinetics of the strained Mo 2 N in Co/Mo 2 N, thereby improving its catalytic efficacy. This work provides valuable insights into controlling lattice strain to develop highly efficient electrocatalysts towards advanced electrocatalytic applications.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2024
·
IF 4.9
Jiancheng Liu,Yu Yang,Yunying Xie,Fuchao Jia,Huijuan Niu,Xiaomei Wang,Tong Zhou,Guangchao Yin,Bo Liu
Isopropanol possessed enormous significance across various application fields from industry to healthcare. Detecting isopropanol was essential in leak detection and diagnosis of disease because it can assist diagnose of lung cancer and guarantee safety in industrial environment via discerning potential leaks. In this research, a simple hydrothermal method and subsequent sacrificial template strategy were used to fabricate in-situ growth SnO 2 nanotube arrays (SnO 2 NTs). Next, SnO 2 NTs was decorated with boron nitride quantum dots (BNQDs) in order to enhance the gas-sensing performances of the SnO 2 NTs. The BN/12-SnO 2 NTs exhibited the highest response (s = R a /R g ) of up to 7.9 for 100ppm IPA, which was 2.7 times that of the 12-SnO 2 NTs. The response and recovery times of the SnO 2 NTs-based sensor were around 10 s and 8 s, respectively. The optimal working temperature of BN-SnO 2 NTs was 260 ℃, which was significantly lower than that of the pure SnO 2 NTs sensor (320 ℃). The improved sensing performances were largely attributed to the sensitization effects of BNQDs and the one-dimensional hollow structure of SnO 2 NTs, which brought about the generation of more oxygen-active species on the surface of BN-SnO 2 NTs and a significant decrease in the activation energy of the redox reaction .
研究领域:
材料科学
·
传感器技术
✓ 已验证
DOI
高影响因子
PROPELLANTS EXPLOSIVES PYROTECHNICS
·
2022
·Vol. 47
·期 10
·e202200076
·
IF 2.134
Zhenzhan Yan,Shuang Wang,Li Yang,Jimin Han,Wenchao Tong
In this work, graphene oxide-doped lead-containing metal-organic framework (BTC−Pb/GO) and polyvinyl alcohol were used as raw materials to prepare spherical or cylindrical lead azide composites by freeze-drying, carbonization, and in-situ azide steps. Nanoscale lead azide is uniformly distributed on the graphene-doped porous carbon framework. Detailed characterization and testing show that LA/C/rGO exhibits excellent electrostatic sensitivity (1.94 J) and flame sensitivity (40 cm) due to the excellent electrical and thermal conductivity of porous carbon and graphene, which are superior to most of the previously reported modified lead azide.
研究领域:
材料科学
·
爆炸物化学
✓ 已验证
DOI
高影响因子
Small Methods
·
2019
·Vol. 4
·期 2
·1900753
·
IF 0
Jipeng Liu,Liwei Dong,Dongjiang Chen,Yupei Han,Yifang Liang,Mengqiu Yang,Jiecai Han,Chunhui Yang,Weidong He
Metal oxides are arguably a promising solution to next-generation high-energy-density anode materials. In particular, molybdenum oxides own high theoretical specific capacity (1117 and 838 mA h g −1 for MoO 3 and MoO 2 , respectively), high chemical stability, and low cost. The low electronic conductivity of MoO 3 limits their charge–discharge rate performances and delithiation capability. By controlling the valence state of MoO x with carbon, partial MoO 3 can be reduced to MoO 2 with low electrical resistance and high-rate capacity. Nonetheless, both molybdenum oxides undergo large-volume expansion/shrinkage and even pulverization in the lithiation/delithiation process. Herein, through a facile pyrolysis method a MoO x /N-doped carbon nanotube (NCNT) anode with controllable valence states of Mo is designed. The high conductivity and flexibility of the NCNT matrix form a stable MoO 2 /MoO 3 anode with finely matched lattices and coordinated 3d electrons. Owing to molecularly close contact between electron-rich CNTs and MoO x , MoO x /NCNTs own a high conductivity of 0.36 S cm −1 , and mitigate the volume expansion in charges and discharges. The MoO 3 /MoO 2 /NCNTs anode delivers an unparalleled high gravimetric capacity of 970 mA h g −1 , over 100-cycle stability and high rate capability.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
Advanced Materials Technologies
·
2022
·Vol. 7
·期 10
·2101740
·
IF 8.856
Lianjia Zhao,Xiyao Fu,Hao Xu,Yiqiang Zheng,Wei Han,Lili Wang
Temperature is a basic physical quantity that is essential to life and productivity. However, continuously and efficiently monitoring a full range of temperatures remains a serious challenge. Herein, a full-range (−20 to 100 °C) flexible temperature sensor is designed using Ti 3 C 2 T x MXene as an active conductive skeleton and sodium alginate hydrogel as a heat-sensitive coating layer. The sensor exhibits accurate and stable temperature response across the entire range, with a sensitivity of up to 3244% °C −1 . Moreover, it not only dynamically detects liquid nitrogen, but also effectively senses gradually approaching objects within a certain range. Lastly, a temperature monitoring system based on the sensor realizes the perfect monitoring of a cold-storage model. This work will inject new vitality into the development of temperature sensors.
研究领域:
材料科学
·
传感器技术
·
生物医学工程
✓ 已验证
DOI
高影响因子
ADVANCES IN POLYMER TECHNOLOGY
·
2020
·Vol. 2020
·期 1
·7819049
·
IF 1.539
Ruizhi Gong,Liuliu Yang,Shuo Qiu,Wan-Ting Chen,Qing Wang,Jiazhuo Xie,Geoffrey I. N. Waterhouse,Jing Xu
Covalent triazine frameworks (CTFs) have emerged as new candidate materials in various research areas such as catalysis, gas separation storage, and energy-related organic devices due to their easy functionalization, high thermal and chemical stability, and permanent porosity. Herein, we report the successful synthesis of a CTF rich in cyano groups (CTF-CN) by the solvothermal condensation of 2,3,6,7-tetrabromonapthalene (TBNDA), Na 2 (1,1-dicyanoethene-2,2-dithiolate), and 1,3,5-tris-(4-aminophenyl)-triazine (TAPT) at 120°C. XRD, SEM, and TEM characterization studies revealed CTF-CN to be amorphous and composed of ultrathin 2D sheets. CTF-CN possessed strong absorption at visible wavelengths, with UV-vis measurements suggesting a band gap energy in the range 2.7-2.9 eV. A 5 wt.% Pt/CTF-CN was found to be a promising photocatalyst for hydrogen production, affording a rate of 487.6 μ mol g -1 h -1 in a H 2 O/TEOA/CH 3 OH solution under visible light. The photocatalytic activity of CTF-CN was benchmarked against g-C 3 N 4 for meaningful assessment of performance. Importantly, the 5 wt.% Pt/CTF-CN photocatalyst exhibited excellent thermal and photocatalytic stability. Further, as a nitrogen-rich porous 2D material, CTF-CN represents a potential platform for the development of novel electrode material for fuel cells and metal ion batteries.
研究领域:
材料科学
·
催化化学
·
能源科学
✓ 已验证
DOI
高影响因子
IONICS
·
2016
·Vol. 23
·期 4
·985-996
·
IF 2.119
Sun Kanjun,Li Jindan,Peng Hui,Feng Enke,Ma Guofu,Lei Ziqiang
Nitrogen-doped porous activated carbons (N-PHACs) have been successfully synthesized using pomegranate husk as carbon precursor via ZnCl 2 -activation carbonization and subsequent urea-assisted hydrothermal nitrogen-doping method. The obtained N-PHACs possesses abundant mesoporous structure, high specific surface area (up to 1754.8 m 2 g −1 ), pore volume (1.05 cm 3 g −1 ), and nitrogen-doping content (4.51 wt%). Besides, the N-PHACs-based material showed a high specific capacitance of 254 F g −1 at a current density of 0.5 A g −1 and excellent rate performance (73% capacitance retention ratio even at 20 A g −1 ) in 2 M KOH aqueous electrolyte, which is attributed to the contribution of double-layer capacitance and pseudocapacitance. The assembled N-PHACs-based symmetric capacitor with a wide operating voltage range of 0–1.8 V exhibits a maximum energy density of 15.3 Wh kg −1 at a power density of 225 W kg −1 and superior cycle stability (only 6% loss after 5000 cycles) in 0.5 M Na 2 SO 4 aqueous electrolyte. These exciting results suggest that the novel N-doping porous carbon material prepared by a green and low-cost design strategy has a potential application as high-performance electrode materials for supercapacitors.
研究领域:
材料科学
·
电化学
·
纳米能源
·
储能材料
·
碳材料
✓ 已验证
DOI
高影响因子
DALTON TRANSACTIONS
·
2020
·Vol. 49
·期 11
·3495-3502
·
IF 4.174
Yu Wang,Zhenmin Ding,Xinjun Li,Shuqin Ren,Shuhua Zhou,Hongming Zhang,Yuan Li,Shumin Han
Magnesium hydride is considered to be one of the most desirable hydrogen storage materials due to its high weight capacity (7.6 wt% H2) and low price. However, its relatively high operating temperatures and slow dynamics have always hampered its commercial applications. In this paper, nano-nickel particle coated nitrogen-doped carbon spheres (Ni@NCS) were synthesized by a chemical reduction method and then introduced into Mg to form an MgH2–Ni@NCS composite via hydriding combustion and subsequent high-energy ball milling processes. The results showed that the MgH2–Ni@NCS composite possessed high hydrogen storage capacity and fast absorbing/desorbing kinetics, absorbing 5.7 wt% H2 and desorbing 4.3 wt% H2 within 8 min at 623 K. Moreover, the capacity shows negligible degradation after 10 cycles, indicating that the MgH2–Ni@NCS composite has good cycling stability. Even at relatively low temperature (373 K), the MgH2–Ni@NCS composite still absorbed 4.2 wt% H2 within 60 min compared to 0.9 wt% H2 for milled MgH2. The improvement in hydrogen storage properties is ascribed to the in situ formed Mg2NiH4 induced dehydrogenation of MgH2 and effective prevention of the agglomeration of magnesium during the hydriding/dehydriding reaction by the carbon material.
研究领域:
材料科学
·
能源化学
·
纳米催化
·
储氢技术
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）