JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2021
·
IF 4.464
Liyan Wu,Jianmei Cen,Asad Ali,Jiecai Li,Pei Kang Shen
Conducting polymers are commonly used as precursors for preparing carbon-based catalysts and have been used in electrocatalytic water splitting. However, so far, most of the catalytic materials synthesized with the assistance of high polymer conducting polymers are non-self-supporting and have only a single-function catalytic effect. Therefore, it is an inevitable trend to synthesize a bifunctional self-supported, highly efficient and long-stable water splitting catalyst. Herein, a self-supporting polypyrrole precursor PPy-PW 12 was prepared by electrodeposition with phosphotungstic acid as a dopant. In addition, the PPy-PW 12 precursor was then calcined. The as-prepared W/Ni 3 (PO 4 ) 2 @NC/NF electrocatalyst exhibits admirable HER and OER performances with overpotentials of 48 mV for HER and 236 mV for OER to reach a current density of 10 mA cm −2 in 1.0 M KOH solution. Additionally, when W/Ni 3 (PO 4 ) 2 @NC/NF is used in overall water splitting as a bifunctional catalyst, it needs only 1.53 V to deliver a current density of 10 mA cm −2 , which is superior to typically integrated Pt/C and RuO 2 counterparts. Our work offers a facile strategy to apply W/Ni 3 (PO 4 ) 2 @NC/NF as practical bifunctional electrocatalysts for large-scale water splitting.
研究领域:
电化学
·
材料科学
·
催化
·
能源材料
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DOI
高影响因子
Energy Material Advances
·
2025
·
IF 15.9
Yue Peng,Pengfei Bi,Xu Zhu,Peitao Liu,Meijing Ren,Yanqing Zu,Xiaodong Li,Ailing Feng
The slow kinetics of oxygen reduction reaction (ORR), oxygen evolution reaction (OER), and hydrogen evolution reaction (HER) pose important challenges to energy storage. Defect engineering offers an effective strategy to enhance the performance of electrocatalytic materials. In this study, we synthesized trifunctional catalysts (CoO X /Co 9 S 8 @NC) derived from cobalt-based metal–organic frameworks modified with oxygen-sulfur double vacancies. These vacancies improve catalytic activity by increasing active sites and enhancing charge-transfer capacity. The CoO X /Co 9 S 8 @NC catalyst demonstrates outstanding ORR and OER bifunctional activity (Δ E = 0.63 V) and HER performance comparable to noble metal catalysts. Liquid zinc-air batteries exhibited superior cycling stability (2,520 cycles at 2 mA/cm 2 ). This defect engineering strategy presents a novel pathway for developing high-performance electrocatalysts and holds important potential for energy-conversion technologies.
研究领域:
材料科学
·
电化学
·
能量存储与转换
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纳米复合材料
·
催化
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产品关联
DOI
高影响因子
JOURNAL OF POWER SOURCES
·
2020
·
IF 8.247
Donghao Wang,Yuqi Wu,Xuefan Zheng,Shijun Tang,Zhengliang Gong,Yong Yang
All-solid-state Li–S batteries (ASSLSBs) offer an opportunity to realize both high energy density , safety and reliability, via eliminating the polysulfides shuttle effect and flammable liquid electrolyte. However, the sluggish kinetics of S and Li 2 S solid conversion results in low discharge capacity at high active material loading, which is critical for ASSLSBs to implement the high energy density potential. Herein, nitrogen doped-carbon (NC) coated Li 2 S (Li 2 S@NC composite) is developed for ASSLSBs that highly improves electrochemical performance. A thin and uniform nitrogen doped-carbon layer is coated on Li 2 S via pyrolysis deposition approach to prepare Li 2 S@NC. The as obtained Li 2 S@NC composite exhibits greatly enhanced electrochemical performance with high reversible capacity, high coulombic efficiency of ~100%, good rate capability and cycling stability. Particularly, outstanding electrochemical performance with high capacity of 931 mAh g −1 can also be obtained at both high Li 2 S content (43%) and high areal Li 2 S loading (10.4 mg cm −2 ).
研究领域:
材料科学
·
电化学
·
能源存储
·
固态电池
·
纳米材料
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DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2023
·
IF 6.7
Guangda Zhou,Xiaoli Yan,Tianyu Zhang,Kui Wang,Jingtao Zhang,Junjie Guo
The rational design and construction of the hierarchical porous structure of carbon framework to support transition metal-based catalysts is critical to increase their active sites density and facilitate mass/electron transport. Herein, we report a novel nanocapsules with cobalt core and nitrogen-doped carbon shells (Co@NC) supported on MOFs-derived hierarchical porous carbon framework. The rational hierarchical porous carbon framework with controllable size and micropore/mesoporous ratio was achieved by one-step pyrolysis of Zn(acac) 2 ·phen ligand and ZIF-67 precursor, which is beneficial for the mass transport in the oxygen reduction reaction (ORR). The 0.4Co@NC-900 electrocatalyst display a distinguished ORR activity in the pH-universal range, with a half-wave potential of 0.91 V in alkaline and 0.76 V in acid electrolytes. The excellent ORR performance of our electrocatalyst can be attributed to its optimized micropore/mesoporous ratio of carbon framework with efficient mass transport, together with the graphitized carbon shell on Co nanoparticles which not only enhances the electron/proton transport, but also suppresses the chemical corrosion of the Co nanoparticles. Impressively, the Zinc-air battery as air electrode offers peak power density of 203 mW cm −2 and long-term stability of 130 h, showing an excellent battery performance. This study offers a fresh method of constructing ORR catalysts with increased activity and durability over a universal pH range.
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产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2021
·
IF 8.128
Yalin Yu,Zhihao Dong,Ling Tan,Nannan He,Rong Tang,Fang Jiang,Huan Chen
Diminishing the size of metal nanostructures can significantly improve the performance of catalysts. However, the self-aggregation of small particles is still an insurmountable obstacle, resulting in the unfavorable stability and recyclability. Herein, we designed and fabricated the Pd-CeO 2-x -NC catalyst though an accurate deposition strategy to downsize the Pd particle to sub-nanometer level and enhance its running stability. The CeO 2-x nanoclusters were firstly dispersed on the nitrogen-doped carbon nanosheets. Further, the active Pd sub-nanoclusters were accurately scattered on the surface of CeO 2-x ascribing to the strong metal-support interaction (SMSI) between Pd and CeO 2-x , which was beneficial to promote the catalytic activity. Subsequently, the high oxidation state Pd n + species were formed due to the electron transfer from Pd to CeO 2-x caused by the SMSI effect. Strikingly, the HER performance of Pd-CeO 2-x -NC was surprisingly correlated with the ratio of Pd n + , suggesting Pd n + acted as the dominant active species. Besides, the SMSI effect stabilized the valence state of active Pd n + species and prevented the sub-nanometer Pd clusters from aggregation, which played a vital role for the enhanced stability of the hybrid catalyst. This synthetic process described here is contributed to prepare various nanostructured catalysts with satisfactory stability through the direct targeting strategy.
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DOI
PubMed
高影响因子
INTERNATIONAL JOURNAL OF FOOD SCIENCE AND TECHNOLOGY
·
2021
·Vol. 57
·期 1
·516-524
·
IF 3.713
Wangshu Zhang,Luyang Jing,Huiyun Chen,Sheng Zhang
Summary The effect of carnauba wax-based nanoemulsion coating-1 (NC-1) combined with 1-methylcyclopropene (1-MCP) treatment on the storage of honey peach fruit ‘Yulupantao’ for 28 days under 0 ± 0.5 °C, and 90% RH conditions was studied. The results showed that NC-1 or 1-MCP treatment alone and in combination were proved to be more effective in maintaining fruit qualities compared to the control group with no treatment. However, the application with the combination of NC-1 and 1-MCP treatment had the most significant effect on reducing mass loss and decay rate, maintaining firmness, total soluble solids (TSS), ascorbic acid (AsA) and titratable acid (TA) contents, suppressing malondialdehyde (MDA) accumulation and conductivity ascend. Moreover, the activities of peroxidase (POD) were maintained, and polyphenol oxidase (PPO) and phenylalanine ammonialyase (PAL) were effectively suppressed in NC-1, 1-MCP and combined treatment than that of control. Therefore, the combination of NC-1 and 1-MCP treatment could be an efficient way to maintain the qualities of peach fruit during low-temperature storage after harvest.
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产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2023
·
IF 6.7
Rongyao Ma,Guolang Zhou,Mingrui Gu,Xin Tang,Wenhao Ding,Yu Guan,Yexin Jiang,Jingzhou Yin,Lili Zhang,Edison Huixiang Ang
In this study, we synthesized Co-based coordination polymer-derived nitrogen-doped carbon-coated Co 3 O 4 spheres (Co 3 O 4 @NC) and yolk-shell Co 3 O 4 spheres (Co 3 O 4 -YS) under various atmospheric conditions to explore their efficacy in activating peroxymonosulfate (PMS) for tetracycline (TC) degradation. The Co 3 O 4 @NC, featuring a significantly higher specific surface area (268.4 m 2 /g), exhibited remarkable performance by achieving 90% TC removal in 5 minutes using 0.2 g/L PMS and 0.1 g/L of Co 3 O 4 @NC. This reaction rate was 9.2 times higher than that observed with Co 3 O 4 -YS. Furthermore, the Co 3 O 4 @NC/PMS system demonstrated exceptional stability across a wide pH range, in complex water compositions, and the presence of common coexisting ions. The unique coated structures effectively minimized the leaching of Co ions (below 0.447 mg/L). Additionally, the strong magnetism of Co 3 O 4 @NC allows for easy separation under a magnetic field. Mechanistic investigations identified 1 O 2 , ∙OH, O 2 ∙ - , and SO 4 ∙ - as the principal reactive species. The study also explored potential degradation pathways and toxicity.
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DOI
高影响因子
Green Energy & Environment
·
2020
·
IF 6.395
Qiongguang Li,Yanhong Wang,Jing Yu,Menglei Yuan,Qiangqiang Tan,Ziyi Zhong,Fabing Su
To mitigate the massive volume expansion of Si-based anode during the charge/discharge cycles, we synthesized a superstructure of Si@Co–NC composite via the carbonization of zeolite imidazolate frameworks incorporated with Si nanoparticles. The Si@Co–NC is comprised of Si-nanoparticle core and N-doped/Co-incorporated carbon shell, and there is void space between the core and the shell. When using as anode material for LIBs , Si@Co–NC displayed a super performance with a charge/discharge capacity of 191.6/191.4 mA h g −1 and a coulombic efficiency of 100.1% at 1000 mA g −1 after 3000 cycles, and the capacity loss rate is 0.022% per cycle only. The excellent electrochemical property of Si@Co–NC is because its electronic conductivity is enhanced by doping the carbon shell with N atoms and by incorporating with Co particles, and the pathway of lithium ions transmission is shortened by the hollow structure and abundant mesopores in the carbon shell. Also, the volume expansion of Si nanoparticles is well accommodated in the void space and suppressed by the carbon host matrix. This work shows that, through designing a superstructure for the anode materials, we can synergistically reduce the work function and introduce the confinement effect , thus significantly enhancing the anode materials' electrochemical performance in LIBs.
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产品关联
DOI
高影响因子
SURFACE & COATINGS TECHNOLOGY
·
2020
·
IF 3.784
Qiyue Zhou,Ming Bao,Xiuyuan Ni
In this article, we synthesized a ternary silicon nanowire arrays (SiNWs)-based composite electrode by a novel wet-chemical technique for the application in high-performance supercapacitors . Initially, the polydopamine (PDOP) was loaded as the modifier to enhance the surface hydrophilicity properties of the SiNWs. Meanwhile, PDOP serves as the nitrogen-doped carbon source. Subsequently, the conformal PDOP layer was used as the template to guide the preferential deposition of the nickel oxide (NiO) precursor. Finally, the SiNWs/NC@NiO composite electrode was obtained by a one-step calcination process. The existence of the N-doped carbon was characterized by the XPS and element analysis characterizations. The FE-SEM characterizations revealed the formation processes of NiO nanoflakes precursor on PDOP layer. The N-doped carbon and nickel oxide play a synergistic role in enhancing the electrochemical performance in aqueous electrolytes. The as-prepared SiNWs/NC@NiO composite electrode shows an areal specific capacitance as high as 110 mF/cm 2 at the current density of 1.0 mA/cm 2 .
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产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2018
·
IF 6.735
Bangrun Wang,Jun Jin,Zhaoyin Wen
Core-shell structured germanium@nitrogen-doped carbon (Ge@NC) hybrids with well-encapsulated Ge particles within a conductive coating is an ideal anode material for high energy and power density lithium-ion batteries (LIBs). Here, we propose a novel route to synthesize core-shell structured Ge@NC hybrids by the modified in situ spray pyrolysis technique using a mixed spray solution consisting of a Ge precursor as an active material source and polyvinylpyrrolidone (PVP) as a carbon source. It is found that in situ formed submicron Ge (200–800 nm) crystals encapsulated in a N-doped carbon coating, allows the increase of electrical conductivity for Ge with enhanced structural stability. For lithium storage, the Ge@NC hybrids exhibit superior properties compared to that of pure Ge such as excellent long-term cycling stability (917 mAh g −1 with a capacity decay of 0.018% per cycle for 1000 cycles at 1 C) and outstanding rate capability (806 mAh g −1 at 5 C after 400 cycles). The full cell assembled with Ge@NC anode and LiNi 0.5 Co 0.2 Mn 0.3 O 2 cathode presents high energy density. Moreover, the spray pyrolysis method allows a yield of ∼4.8 g h −1 with a lab-scale equipment, demonstrating that established industrial processes can be applied to produce Ge-based anodes with sophisticated structures.
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产品关联
DOI
高影响因子
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2018
·
IF 3.235
Xinxin Yang,Xiaoli Hu,Xiuli Wang,Wei Fu,Xingquan He,Tewodros Asefa
Developing low-cost and high-performance non-precious metal catalysts (NPMCs) for oxygen reduction reaction (ORR) is of critical importance for commercialization of fuel cells. Herein, we report a NPMC consisting of Fe 3 C nanoparticles encapsulated in mesoporous N-doped carbon (N-C), which is synthesized by a simple two-step strategy comprising pyrolysis of a mixture of MIL-100(Fe) and dicyandiamide under inert atmosphere , followed by treatment of the product with acidic solution to leach removable Fe 3 C species from the material. Fe 3 C@NC-800 (the material prepared at 800 °C) exhibits superior electrocatalytic activity , high durability and excellent methanol tolerance for ORR, with catalytic performance comparable to that of commercial Pt/C in both alkaline and acidic media. Fe 3 C@NC-800's excellent catalytic activity and stability in ORR are due to its large BET surface area, its large total pore volume, its nitrogen dopants and the cooperative effects between the reactive functionalities in it as well as its excellent conductivity.
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DOI
高影响因子
ANALYTICAL SCIENCES
·
2017
·Vol. 33
·期 5
·585-590
·
IF 1.228
Zhu Xiaoqian,Huang Min,Li Jiao,He Hanping,Zhang Xiuhua,Wang Shengfu
In this paper, a novel electrochemical sensor was developed for the rapid detection of G-G mismatched DNA based on hexaammineruthenium(III) chloride ([Ru(NH 3 ) 6 ]C l3 ) as a redox indicator. The sensor platform was constructed by immobilizing small molecules (NC-linker) on the gold electrode via amide bonds. The as-prepared NC-linker as the nucleic acids recognition molecule can interact with the G base of DNA. After the sensor was incubated with G-G mismatched DNA, the double-stranded DNA (dsDNA) acted as carriers of the signal tags-[Ru(NH3)6]Cl3, which resulted in a remarkable electrochemical signal. More binding of [Ru(NH 3 ) 6 ]C l3 led to increases of the electrochemical signal. Other mismatched DNA produced only a low response, as well as complementary DNA. Thus G-G mismatched DNA can be easily discriminated from other mismatched and complementary DNA based on the sensor. Furthermore, the method was simple, rapid and repeatable for the detection of G-G mismatched DNA. The selective detection of target dsDNA was achieved by a relative current ratio of the target and control DNA. These results demonstrated that this strategy could provide great promise for the rapid and specific detection of other sequence-specific DNA.
研究领域:
电化学
·
分子生物学
·
分析化学
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DOI
PubMed
高影响因子
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