INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2022
·
IF 7.139
Weilin Zhong,Chao Wang,Bo Jiang,Suqing Peng,Hailun Zhao,Riyang Shu,Zhipeng Tian,Yanping Du,Ying Chen
Combining solar energy utilization and hydrogen production is an ideal model for renewable energy development. Especially the conversion of broad-spectrum solar energy into chemical energy of hydrogen and thermal energy can enrich solar energy storage methods. Herein, novel multifunctional Au/TiO 2 @n-octadecane microcapsules with core-shell structure were design and synthesized by wet chemical reduction and electrostatic adsorption self-assembly methods for photothermal hydrogen production and thermal storage . The results showed that microencapsulation of photothermal catalysts could provide an effective reaction area and excellent dispersion stability , where hydrogen production and light to hydrogen efficiency were increased in the 43% and 0.3% respectively, compared to the nanoparticle suspension system. Based on the recorded temperature variations caused by the photothermal effect, the calculated photothermal conversion efficiency and specific absorption rate of Au/TiO 2 @n-octadecane was 25.01% and 277% higher than that of Au/TiO 2 suspension. The proposed hydrogen production and thermal storage method via multifunctional microcapsules might shed some light on the study of improving full-spectrum energy conversion efficiency of solar energy.
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DOI
高影响因子
MATERIALS SCIENCE FORUM
·
2017
·
IF 0
Li Peng,Jia Ni Huan,Jing Hua Gong,Jing Hong Ma
Smart hydrogel is a kind of new soft and wet material which can be responsive to external stimuli. Hydrogel fiber owning one dimension size can significantly improve response speed and be easily formed into higher-order assemblies. N-isopropylacrylamide/calcium alginate (NIPA/Ca-alginate) as-spun fiber was generated via microfluidic spinning. Then PNIPA/Ca-alginate hydrogel fiber was prepared through off-chip free radical polymerization of NIPA in the presence of Ca-alginate. The structure and morphology of the hydrogel fiber were characterized by FTIR and SEM. The swelling property and temperature-/pH-response behaviors were also investigated. The PNIPA/Ca-alginate hydrogel fiber had a 3D network porous structure. The thinner the hydrogel fiber, the faster the swelling speed was. Meanwhile, the hydrogel fiber exhibited temperature and pH response.
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DOI
ACS Sustainable Chemistry & Engineering
·
2019
·
IF 6.97
Xianliang Qiao,Chaoyue Zhao,Zhiqiang Zhou,Qingxin Guan,Wei Li
N-doped carbon material is a promising alternative to mercury catalyst for acetylene hydrochlorination. Herein, we present an innovative strategy to synthesize pyridinic N-rich aromatic ladder structure material through controlling the self-assembly of polyacrylonitrile polymer chains. The prepared material gave ∼93% conversion of acetylene with >99% selectivity for vinyl chloride and exhibited a satisfying stability during 200 h lifetime test. Characterizations and density functional theory calculations demonstrated that the activity of the catalyst likely originates from three types of active pyridinic N sites in the ladder structure. Particularly, the pyridinic N sites with one H atom nearby are more active because the H atom can stabilize the transition state through H···Cl bond, thereby reducing the energy barrier. The energy barriers on these pyridinic N sites were calculated to be 29.8 and 47.4 kcal mol–1, much lower than 83.2 and 84.4 kcal mol–1 on those sites without H atom nearby. The facile and highly effective strategy for the synthesis of a specific N species with defined formation mechanism is expected to be helpful in the design of other green catalysts for acetylene hydrochlorination.
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DOI
高影响因子
ACS Applied Materials & Interfaces
·
2021
·
IF 9.229
Xianlu Lu,Xuenan Pan,Zhi Fang,Dongdong Zhang,Shang Xu,Lin Wang,Qiao Liu,Gang Shao,Dingfa Fu,Jie Teng,Weiyou Yang
Currently, a big challenge for the practical use of potassium-ion batteries (PIBs) is their intrinsically poor cycling stability, due to the relatively large radius of K+ and sluggish kinetics for intercalation/deintercalation. Here we report the scalable fabrication of N/S-codoped hollow carbon nanocubes (NSHCCs), which have the potential as an electrode for advanced PIBs with robust stability. Their discharge and charge specific capacities are ∼560 mA h g–1 and 310 mA h g–1 at a current density of 50 mA g–1, respectively. Meanwhile, they exhibit 100% specific capacity retention after 620 cycles over 9 months at a low current density of 50 mA g–1, which is state-of-the-art among carbon materials. Moreover, they demonstrate nearly no sacrifice in specific capacities with 99.9% retention after 3000 cycles over 4 months under a high current density of 1000 mA g–1, superior to most carbon analogues for potassium storage previously reported. The improved electrochemical performance of NSHCC can be mainly attributed to the unique hollow carbon nanocubes with incorporated N and S dopants, which can expand the carbon layer spacing, facilitate K+ adsorption, and relieve the volume change during the intercalation/deintercalation of K+ ions.
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DOI
PubMed
高影响因子
Energy Technology
·
2020
·Vol. 8
·期 9
·2000361
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IF 3.404
Yihua Tang,Xinxin Wang,Jingjing Chen,Xiao Wang,Dajian Wang,Zhiyong Mao
Defects engineering is recognized as one promising strategy to enhance the electrochemical performance of carbon materials applied in energy storage field. Different from the commonly used methods, high-level N-doped carbon nanosheets are synthesized in this work via controllable removal of nitrogen atoms from nitrogen-rich graphite carbon nitride (g-C 3 N 4 ). The nitrogen doping levels and the relative amount of variable nitrogen types, including pyridinic-, pyrrolic-, and graphitic-N, are easily engineered for the obtained carbon nanosheets. Ultrahigh pyridinic-N content as high as 19.1 at% is achieved, closing to the highest values among the reported nitrogen-doped carbon materials. Extraordinary initial discharging capacity of 5190 mAh g −1 at a current density of 50 mA g −1 and excellent cycling stability (1639 mAh g −1 after 200 cycles) as well as promising rate performance (517 mAh g −1 at 2 A g −1 ) are demonstrated when serving as Li-ion battery anodes. The high nitrogen doping level, especially for the high pyridinic-N doping content in materials, is responsible for these outstanding electrochemical Li-ion storage performances. This work opens a new gateway to develop promising nitrogen-doped carbon materials for the practical application in energy storage devices.
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DOI
高影响因子
APPLIED SURFACE SCIENCE
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2021
·
IF 6.707
Yibo Tang,Ying Lei,Kang Tong,Tong Yang,Tiantian Fu,Yang Xiang,Shulin Zhang,Yujun Si,Chaozhong Guo
Fe, N-doped graphene-like carbon layers-wrapped carbon black composite (L-Fe-AD+C) was developed by pyrolyzing the mixture of Fe-adenine precursors and conductive carbon black as an efficient catalyst to oxygen reduction reaction (ORR). Graphitic N sites with more ORR activity are preferentially formed due to the facilitation of metallic Fe. Furthermore, graphene-like ultra-thin networks wrapped around nanoparticles of carbon black greatly increase the exposure of active sites and construct continuous diffusion channels favorable for the transfer of substances. As a result, the as-prepared L-Fe-AD+C exhibits an excellent ORR activity in alkaline electrolyte with a high half wave potential (0.88 V), and superior selectivity together with admirable stability, which are comparable to those of the benchmark Pt/C catalyst. More encouragingly, the L-Fe-AD+C can serve as an efficient cathode catalyst in a zinc-air battery, which reaches a peak power density of 221 mW cm −2 approximating to that of Pt/C catalyst (236 mW cm −2 ). The battery also shows a steady discharge voltage plateau of 1.26 V and specific capacity of 799 mAh g −1 at a discharge current density of 10 mA cm −2 . The results suggest the considerable potential of the L-Fe-AD+C catalyst to replace precious metal catalysts.
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DOI
高影响因子
INTERNATIONAL JOURNAL OF FOOD PROPERTIES
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2019
·
IF 1.398
Ling Li,Hui Ji
The present study investigated the protective effects of the polyphenol epicatechin on the protein structural changes, gel properties and N-nitrosodiethylamine (NDEA) formation of oxidatively stressed myofibrillar protein (MP). Results showed that oxidation treatments to MP significantly increased their carbonyl content and surface hydrophobicity as compared to the control groups (p < 0.05). Epicatechin inhibited protein carbonyl content and surface hydrophobicity, especially treated with 2 mM epicatechin. Under oxidative conditions, the fluorescence intensity of tryptophan gradually decreased with the increase of epicatechin concentrations from 0 to 2 mM. The storage modulus (G’) was increased gradually after oxidation and epicatechin treatment. Epicatechin reduced the loss of P22 and water holding capacity (WHC), promoted the hydration of the proteins. Under oxidative conditions, epicatechin had a concentration dependent effect on the formation of NDEA; low concentrations of epicatechin promoted NDEA formation, while high concentrations inhibited NDEA production. In conclusion, an appropriate quantity of polyphenols can inhibit the oxidation of MP and formation of N-nitrosamines.
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DOI
高影响因子
MATERIALS LETTERS
·
2014
·
IF 2.269
Jing Li,Yan Chen,Yongcai Zhang,Yanyan Zhao,Qian Zhang,Zhanjun Yang
This work reports an alternative preparation and evaluation of nanocrystalline N-modified CeO 2 as a visible-light-active photocatalyst . Nanocrystalline N-modified CeO 2 (which was abbreviated as CeO 2 –HNO 3 ) was synthesized directly via the solvothermal reactions of Ce(NO 3 ) 3 ·6H 2 O, concentrated (65–68 mass%) HNO 3 and toluene at 180 °C for 24 h. The composition, structure and optical property of CeO 2 –HNO 3 were characterized by X-ray diffraction, X-ray photoelectron spectroscopy, transmission electron microscopy and UV–vis diffuse reflectance spectroscopy. The photocatalytic activity of CeO 2 –HNO 3 was tested in the reduction of aqueous Cr 6+ under visible-light ( λ >420 nm) irradiation, and compared with that of CeO 2 –NH 3 (which denoted the product prepared when 25-28 mass% NH 3 ·H 2 O replaced 65–68 mass% HNO 3 ). It was observed that CeO 2 –HNO 3 exhibited much higher photocatalytic activity than CeO 2 –NH 3 in the reduction of aqueous Cr 6+ under visible-light ( λ >420 nm) irradiation. CeO 2 –HNO 3 may be a new promising visible-light-active photocatalyst in efficient utilization of solar energy for treating Cr 6+ wastewater.
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DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2020
·
IF 4.939
Guofu Ma,Xuan Xie,Kanjun Sun,Hui Peng,Shuzhen Cui,Xiaozhong Zhou,Qintao Wang,Ziqiang Lei
Novel Fe 3 C nanoparticles that decorate three-dimensional N-rich porous carbon (Fe 3 C@3DNC) catalysts were designed and synthesized by double templates assisted high-energy ball milling and subsequent high-temperature pyrolysis for the oxygen reduction reaction (ORR). NaCl and Na 2 SiO 3 are used as the mixed template while Fe(NO 3 ) 3 ·9H 2 O and 2-Methylimidazole were used as the iron, nitrogen and carbon sources. The optimized Fe 3 C@3DNC catalyst (Fe 3 C@3DNC-1-900) had good ORR performance in alkaline medium , with an Eonest value of 0.968 V and E 1/2 value of 0.861. In addition, the catalytic process exhibited selectivity–nearly four-electron transfer kinetics and possesses a lower Tafel slope compared to commercial Pt/C catalyst as well as good methanol tolerance. In addition, the Fe 3 C@3DNC-1-900 catalyst also had excellent ORR activity (E 1/2 = 0.72 V) and long-term stability (the half-wave potential only occurs at 10 mV after 5000 cycles) in acidic media. The good catalytic performance of the Fe 3 C@3DNC-1-900 catalyst can be attributed to the 3D hierarchically porous structure and extremely high number of active sites around the porous carbon. The double template assisted high-energy ball milling strategy can be a promising and scalable method to prepare three-dimensional porous carbon-based composite materials for energy conversion and storage applications.
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DOI
高影响因子
ACS Applied Energy Materials
·
2022
·
IF 6.959
Youlin Wu,Pengfei Zhu,Youji Li,Lijun Zhang,Zhiliang Jin
Owing to the creation of a large number of surface active sites, surface modification is an efficient strategy for improving the catalytic performances of photocatalysts. Herein, zero-dimensional (0D) p-type NiS species were developed in situ on the large surface of NiAl-LDH by controlled vulcanization. Importantly, the development of the 0D p-type NiS species not only enriched the active sites but also triggered the in situ formation of a NiS/NiAl-LDH p–n heterojunction due to NiAl-LDH, which was utterly underdeveloped in the vulcanization modification procedure. This undoubtedly accelerated the faster separation and migration of charge carriers and yielded improved photocatalytic hydrogen evolution. The optimum hydrogen production rate of the NiS/NiAl-LDH photocatalyst could reach 3408 μmol·g–1·h–1 using a 5 W LED simulation visible light, which was 52-fold that of NiAl-LDH. The design and construction of the in situ p–n heterojunction may provide a perspective for the formation of p–n heterojunction photocatalysts with a closer contact interface and highly enhanced photocatalytic activity.
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DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2018
·
IF 5.667
Weiwei Mao,Bin Cai,Zhizhen Ye,Jingyun Huang
A glucose oxidase (GOx) based p-NiO/n-Bi 4 Ti 3 O 12 sandwich heterojunction was fabricated and explored as a glucose electrochemical sensor. The constructed GOx/p-NiO/n-Bi 4 Ti 3 O 12 sandwich structure effectively prevents the leakage of GOx. Dandelion-like Bi 4 Ti 3 O 12 nanowires were directly grown on the titanium foil substrates, and dense NiO nanoparticles were deposited by employing pulsed laser deposition at room temperature. Amperometric measurements towards glucose were carried out, and efficient direct electron transfer was successfully achieved. The enzyme biosensor showed a linear range from 20 μM to 3.55 mM (R = 0.999) with an ultrahigh sensitivity of 215 μA mM −1 cm −2 , response time within 2 s, low detection limit of 1.26 μM (S/N = 3) and high specificity. The apparent Michaelis-Menten constant (Km app) was estimated to be 0.22 mM. Intercrossed nanowires and interconnected pores favor the electrons transfer and the massive GOx loading. Binder-free feature leads to a seamless connection between Bi 4 Ti 3 O 12 nanowires and the substrate. Co-catalysis of GOx and p-NiO/n-Bi 4 Ti 3 O 12 heterojunction plays a synergetic role in gaining performance boosts. The GOx based p-NiO/n-Bi 4 Ti 3 O 12 heterojunction biosensor remedies the limitation of enzyme-based glucose sensor and be potentially applied in practice.
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DOI
高影响因子
POLYMER
·
2021
·
IF 4.43
Jia-Wei Li,Miao Chen,Jie-Mei Zhou,Cai-Yuan Pan,Wen-Jian Zhang,Chun-Yan Hong
Polymerization-induced self-assembly (PISA) is an efficient and robust strategy to fabricate polymeric nano-objects. PISA enables us to prepare polymeric nano-objects in situ during the course of polymerization in concentrated solution (up to 50% w/w), making industrial production of polymeric assemblies in large-scale possible. In this work, reversible addition-fragmentation chain transfer (RAFT) dispersion copolymerization of styrene (St) and N-methacryloxysuccinimide (NMAS) was conducted with poly(2-hydroxyethyl acrylate) (PHEA) as a macro-chain transfer agent (macro-CTA) in methanol. Compared with the PHEA-mediated alcoholic dispersion polymerization of St, RAFT dispersion copolymerization of St and NMAS promoted morphology transition of nano-objects to form higher order morphologies (such as worms and vesicles). Moreover, the introduction of NMAS units into the solvophobic blocks provided functional handles for post-PISA modification of the resultant nano-objects via the active ester-amine reaction. The reaction of 1,6-hexanediamine with NMAS units in P(St- co -NMAS) blocks was conducted to afford cross-linked nano-objects with robust structural stability.
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DOI
高影响因子
危险品化学品经营许可证（带存储）