INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2024
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IF 7.7
Jun Shi,Tao Huang,Ruoyu Wu,Jiani Wu,Yulong Li,Yongxi Kuang,Hongmei Xing,Wenli Zhang
Designing carbon materials with specific oxygen-containing functional groups is very attractive for the precise decoration of carbon electrode materials and the basic understanding of specific charge storage mechanisms, which contributes to the further development of high-performance carbon materials for energy storage and conversion applications. In this contribution, a hydroxyl-rich micropore-dominated porous carbon material was obtained by direct carbonization of cellulose. The content of oxygen atoms in hydroxyl form in the obtained carbon is nearly 6 at.%. With the pyrolysis temperature changed, the macroscopic morphology, the specific surface area, surface functional groups, and graphitization degree of the carbon materials were changed strongly. Besides, the carbon material obtained with a carbonization temperature of 900 °C (C9) showed enhanced specific capacitance in sulfuric acid, sodium hydroxide, and sodium sulfate aqueous electrolytes, which mainly originates from the contribution of pseudocapacitance. The pseudocapacitance mainly depends on the presence of surface hydroxyl functional groups. Besides, the pseudocapacitance value of C9 material in neutral electrolytes (151.34 F g −1 ) is about twice that in acidic (75.9 F g −1 ) and alkaline (75.78 F g −1 ) electrolytes.
研究领域:
材料科学
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能源工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ENERGY & FUELS
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2023
·
IF 5.3
Weiwei Zhu,Dekui Shen,Haijiao Xie
The primary objective of this investigation is to assess the electrochemical properties of porous carbon, concurrently doped with nitrogen and oxygen, featuring a diverse array of surface heteroatoms. We synthesized this type of porous carbon material from Houttuynia cordata, subjected to procedures of nitrogen infusion and activation. Our findings indicate a strong relationship between the pseudocapacitance of the dually doped porous carbon and the concentration of pyridinic-nitrogen. As the pyridinic-nitrogen content increases, the pseudocapacitance first increases due to the growing tendency of active sites. After the pyridinic-nitrogen/carbon atomic ratio reaches 0.027, the pseudocapacitance decreases because the conductivity of the carbon material decreases. Density functional theory simulations indicate that the band gap of pyridinic-nitrogen-doped graphene is 0.021 eV, which is larger than that of nitrogen-free graphene. The increased band gap makes electronic transitions less likely, and the conductivity decreases.
研究领域:
材料科学
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电化学
✓ 已验证
产品关联
DOI
高影响因子
EcoMat
·
2022
·Vol. 4
·期 5
·e12217
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IF 12.213
Tuzhi Xiong,Yingxia Gao,Peng Huang,Yongchao Huang,Hao Yang,M-Sadeeq (Jie Tang) Balogun
Upon evaluating the pseudocapacitance contribution ( k 1 v ) of electrode materials, the exact capacity (also termed as actual pseudocapacity , k Q ) is usually ignored. However, there is a significant variation between k 1 v and k Q . Herein, we designed tunable in situ core-shell electrode materials to examine the variation between the k 1 v and k Q . Using nickel foam (NF) as the starting material, the internal structure of NF is systematically controlled via in situ strategy to obtain the optimized nickel oxide core–shell architectures (denoted NFNTO). Despite the directly oxidized NF (denoted NFO) exhibits a higher k 1 v (79.1%) than the NFNTO (47.6%), the k Q of NFNTO is ≈2.3 fold larger than NFO at the highest current density of 8.0 mA cm −2 . The higher k Q can be attributed to the integration of titanium that shortens the Li + diffusion pathway, boosts the diffusion co-efficient and improves the electronic conductivity towards achieving enhanced ionic transport.
研究领域:
材料科学
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电化学
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产品关联
DOI
高影响因子
RSC Advances
·
2019
·Vol. 9
·期 24
·13458-13464
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IF 3.049
Hao Guo,Mingyue Wang,Rui Xue,Jing Yao,Xuejiao Wang,Longwen Zhang,Jianfeng Liu,Wu Yang
A new COF (NWNU-COF-4) linked by an aryl ether bond (Ar–O–Ar) was synthesized by the condensation reaction of 2,4,6-trihydroxypyrimidine and trinitrophenol under simple and easy reaction conditions. Fourier transform infrared spectroscopy (FT-IR), X-ray photoelectron spectroscopy (XPS), N2 adsorption–desorption, thermogravimetric analysis (TGA), powder X-ray diffraction (XRD) and scanning electron microscopy (SEM) were utilized to characterize the product. The BET specific surface area of NWNU-COF-4 was 21.33 m2 g−1, and its pore size was about 1.351 nm. Additionally, this method of preparation was simple and cheap. The electrochemical measurements showed that the synthesized NWNU-COF-4 had excellent pseudocapacitive performance with maximum specific capacitance of 133.44 F g−1 at 0.3 A g−1 in 6 mol L−1 KOH electrolyte. When the current density increased by 10 times (3.0 A g−1), the specific capacitance was 114.12 F g−1, and the retention rate was 82%. After 10 000 GCD cycles, the capacitance still kept 94% of its initial capacitance.
研究领域:
材料科学
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电化学
✓ 已验证
DOI
PubMed
高影响因子
Journal of Materials Chemistry A
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2016
·Vol. 4
·期 27
·10609-10617
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IF 8.262
Dewei Liang,Shouliang Wu,Jun Liu,Zhenfei Tian,Changhao Liang
Morphology control and impurity doping are two widely applied strategies to improve the electrochemical performance of nanomaterials. Herein, we report an environmentally friendly approach to obtain Co-doped Ni(OH)2 nanosheet networks using a laser-induced cobalt colloid as a doping precursor followed by an aging treatment in a hybrid medium of nickel ions. The shape and specific surface area of the doped Ni(OH)2 can be successfully adjusted by changing the concentration of sodium thiosulfate. Furthermore, a Co-doped Ni(OH)2 nanosheet network was further converted into Co-doped NiO with its pristine morphology retained via facile thermal decomposition in air. The structure and electrochemical performance of the as-prepared samples are investigated with scanning and transmission electron microscopy, energy dispersive X-ray analysis, X-ray diffraction, Fourier transform infrared spectroscopy, the nitrogen adsorption–desorption isotherm technique, and electrochemical measurements. The Co-doped Ni(OH)2 electrode shows an ultrahigh specific capacitance of 1421 F g−1 at a current density of 6 A g−1, and a good retention level of 76% after 1000 cycles, in sharp contrast with only a 47% retention level of the pure Ni(OH)2 electrode at the same current density. In addition, the Co-doped NiO electrode exhibits a capacitance of 720 F g−1 at 6 A g−1 and 92% retention after 1000 cycles, which is also superior to the corresponding values of relevant pure NiO electrodes. The Co2+ partially substitutes for Ni2+ in the metal hydroxide and oxide, resulting in an increase of free holes in the valence band, and, therefore, enhancement of the p-type conductivity of Ni(OH)2 and NiO. Moreover, such novel mesoporous nanosheet network structures are also able to enlarge the electrode–electrolyte contact area and shorten the path length for ion transport. The synergetic effect of these two results is responsible for the observed ultrahigh pseudocapacitor performance.
研究领域:
材料科学
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电化学
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产品关联
DOI
高影响因子
Advanced Energy Materials
·
2018
·Vol. 9
·期 1
·1803035
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IF 21.875
Peng Ge,Sijie Li,Laiqiang Xu,Kangyu Zou,Xu Gao,Xiaoyu Cao,Guoqiang Zou,Hongshuai Hou,Xiaobo Ji
As a result of its high-energy density, metal–selenides have demanded attention as a potential energy-storage material. But they suffer from volume expansion, dissolved poly-selenides and sluggish kinetics. Herein, utilizing' thermal selenization via the Kirkendall effect, microspheres of NiSe 2 confined by carbon are successfully obtained from the self-assembly of Ni-precursor/PPy. The derived hierarchical hollow architecture increases the active defects for sodium storage, while the existing double N-doped carbon layers significantly alleviate the volume swelling. As a result, it shows ultrafast rate capability, delivering a stable capacity of 374 mAh g −1 , even after 3000 loops at 10.0 A g −1 . These remarkable results may be ascribed to the Ni O C bonds on the interface of NiSe 2 and the carbon film, which leads to the faster transfer of ions, the effective trapping of poly-selenide, and the highly reversible conversion reaction. The kinetic analysis of cyclic voltammetry (CV) demonstrates that the electrochemical process is mainly dominated by pseudocapacitive behaviors. Supported by the results of electrochemical impedance spectroscopy (EIS), it is confirmed that the solid–electrolyte interface films are reversibly formed/decomposed during cycling. Given this, this elaborate work might open up a potential avenue for the rational design of metal-sulfur/selenide anodes for advanced battery systems.
研究领域:
材料科学
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电化学
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产品关联
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
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2016
·Vol. 40
·期 3
·2304-2314
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IF 3.277
Zilan Feng,Daize Mo,Weiqiang Zhou,Qianjie Zhou,Jingkun Xu,Baoyang Lu,Shijie Zhen,Zhipeng Wang,Xiumei Ma
In this work, poly(N-methyl-3,4-dihydrothieno[3,4-b][1,4]oxazine) (PMDTO), a new nitrogen poly(3,4-ethylendioxythiophene) (PEDOT) analogue, was synthesized by an electrochemical deposition method, and the capacitive properties of PMDTO were investigated and compared with those of PEDOT. The structure and morphology of PMDTO were characterized by ultraviolet-visible spectroscopy, Fourier transform infrared spectroscopy, scanning electron microscopy, and thermal analysis. The pseudocapacitive properties of the as-prepared PMDTO electrodes have been examined by cyclic voltammetry (CV), galvanostatic charge–discharge (GCD) measurements and electrochemical impedance spectroscopy (EIS) in 0.1 mol L−1 CH3CN–Bu4NBF4 electrolyte solution. The as-prepared PMDTO electrode showed a high specific capacitance of 154.3 F g−1 at a discharge current density of 3 A g−1 and exhibited cycling stability with the maximal capacitance retention of nearly 71% after 500 cycles at a high current density of 10 A g−1. Additionally, the asymmetrical supercapacitor based on PMDTO and PEDOT electrodes exhibited a maximum specific capacitance of 63.5 F g−1 and an energy density of 12.7 W h kg−1 at a power density of 0.59 kW kg−1. These results implied that the PMDTO electrode can be used as a potential electrode material for supercapacitors.
研究领域:
材料科学
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电化学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Cleaner Production
·
2024
·
IF 9.7
Lizheng Yang,Yingqi Heng,Jianping Sun,Dongying Hu,Fangchao Cheng
Conventional supercapacitors face narrow voltage and an inevitable reduction in capacitance retention during operation, significantly preventing its further commercial application. So, biomass-derived composite materials have attracted intensive attention, especially for pseudocapacitive supercapacitors. Herein, a high-end utilization strategy of lignin to induce a 3D porous layered MXenes/graphene oxide hybrid electrode (LGM 2 -80) and homologous gel electrolytes with low interface resistance for lignin-derived supercapacitors is demonstrated by a simple hydrothermal method. A more uniform distribution and smaller nanospheres ≈<10 nm of lignin prevent the restacking and increase the interlayer spacing of graphene oxide, also play an adhesive role between graphene oxide and MXene, guaranteeing the maximization of the pseudocapacitance effect between lignin and MXene. Consequently, the LGM 2 -80 electrode showed a wide operating potential (−0.7∼1.0 V), breaking through the bottleneck of MXene-derived devices with limited working voltage (typically≤0.6 V). Furthermore, the lignin-derived symmetric quasi-solid-state supercapacitor (LGM 2 -80//lignin gel//LGM 2 -80) possesses an excellent capacitance retention rate of 149 % at 5,000 cycles, which is far exceeding the current reported supercapacitors. This innovative use of lignin opens up new perspectives for ultra-voltage and ultra-high capacitance retention of advanced supercapacitors.
研究领域:
材料科学
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能源存储
·
生物质利用
✓ 已验证
产品关联
DOI
高影响因子
Nano Energy
·
2019
·
IF 15.548
Sheng Huang,Chao Meng,Min Xiao,Shan Ren,Shuanjin Wang,Dongmei Han,Luyi Sun,Yuezhong Meng
Pseudocapacitive Na + storage based on the fast absorption/desorption kinetics is a new alternative to realize the high rate capability, which rely on increasing the surface area and creating surface vacancies. This means low Na + capacity because of low dielectric constant for the reported pseudocapacitive Na + storage materials. According to the capacitance formula, we find increasing the dielectric constant is a new path to improve the Na + capacity. This dielectricity (other than surface engineering) based pseudocapacitance can be called more real pseudocapacitance. The superparaelectric 2-dimensional (2D) Sn 2 P 2 S 6 has much higher dielectric constant than the bulk counterpart. The identical polaron direction triggered superparaelectricity and high dielectric constant of 2D Sn 2 P 2 S 6 are well verified. And 2D assembly between the 2D Sn 2 P 2 S 6 and graphene construct the compact network for conductivity of electron and Na + . As results, the 2D Sn 2 P 2 S 6 battery based on more real pseudocapacitance delivers alloy-like capacity and long cycle stability.
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
Journal of Materials Chemistry A
·
2020
·Vol. 8
·期 14
·6539-6545
·
IF 11.301
Jian Zhang,Qing Yin,Jianeng Luo,Jingbin Han,Lirong Zheng,Min Wei
NiFe saponite (NF-SAP) with Na+ pillaring was investigated for the first time, as a new anode material for high-performance lithium-ion batteries (LIBs). In this material, non-metallic element Si and metallic elements Fe and Ni all act as active components (providing capacity) and undergo valence state changes during electrochemical progress. Si changes between Si2+ and Si4+, while Fe and Ni transform between a nearly metallic state and Fex+ and Niy+ (0 < x < 3, 0 < y < 2). In the fully lithiated state, Ni–Ni bonds appear but only Fe–O bonds can be observed in NF-SAP. The NF-SAP/Li half cell delivers a gradually increasing specific capacity in the initial hundreds of cycles (maximum capacity of 815 mA h g−1 at the 350th cycle) and maintains a capacity of 646 mA h g−1 after 1000 cycles at 500 mA g−1. The pre-pillaring effect of Na+ is responsible for the good Li+ storage performance, which leads to the decrease of Li+ transport hindrance and high contribution of pseudocapacitance. Furthermore, a full cell of LiMn2O4/NF-SAP was assembled, which shows an initial specific capacity of 104 mA h g−1 at 100 mA g−1 and maintains a capacity of 68% after 50 cycles, demonstrating the bright application prospects of NF-SAP as a promising anode material. This work shows a new kind of anode for LIBs and provides an in-depth understanding of its energy-storage mechanism. Considering the easy preparation, low cost and environment-friendly characteristics of NF-SAP, this kind of material is applicable to large-scale energy storage.
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 Energy Storage
·
2022
·
IF 8.907
Shuxin Zhou,Huailin Fan,Fei He,Zhaobing Fu,Guoming Gao,Shu Zhang,Xun Hu
Metal selenides are necessary electrode materials in electrochemical energy storage , demonstrating comparable or even superior electrochemical performance to metal oxides . However, the role of Se of metal selenide on the pseudocapacitance is still opaque. Therefore, NiO/NiCo 2 O 4 /CoO and NiCoSe 2 spheres are contrastively synthesized and evaluated in an electrochemical system. The specific capacitance of the NiCoSe 2 electrode is 685 F·g −1 (411C·g −1 , 114.2 mAh·g −1 ) at 1 A·g −1 , which is 5.27 times as much as that of the NiO/NiCo 2 O 4 /CoO electrode (130 F·g −1 , 78 C·g −1 , 21.7 mAh·g −1 ). During charging-discharging for metal selenides electrodes, the new species of CoOOH and NiOOH appear, and the selenium in the NiCoSe 2 sphere disappears, indicating that the hydroxides but not the selenide participate in the electrochemical pseudocapacitance. Selenium does not participate in pseudo-capacitance reactions and promotes the transformation of the active phase. In addition, excellent electrical conductivity of selenium increase the electrochemical performance. The asymmetric device with NiCoSe 2 as a positive electrode shows a superior energy density of 24 Wh·kg −1 at 800 W·kg −1 and outstanding stability (146% retention after 5000 cycles). Notably, two asymmetric devices in series can be charged to 3.21 V by a solar-panels, which can successfully drive different loads, indicating the outstanding performance of the devices.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2021
·
IF 9.229
Yanfei Xin,Xin Dai,Guangjun Lv,Xuedong Wei,Sai Li,Zhiqiang Li,Tong Xue,Ming Shi,Kunyang Zou,Yuanzhen Chen,Yongning Liu
α-Ni(OH)2 is an ideal candidate material for a supercapacitor except for its low conductivity and poor stability. In this work, BO2–-intercalated α-NixCo(1–x)(OH)2 is synthesized by a hydrothermal method at a low cost. The Co dopant can decrease the charge-transfer resistance and enhance the cyclic stability. The special unsaturated electronic state of BO2– enhances the bonding with metal ions and attracts water molecules. Thus, the BO2– ions support the hydroxide layers as pillars and create efficient paths for proton transportation, optimizing the utilization of α-Ni(OH)2. The three-dimensional (3D) flowerlike morphology supplies an enormous number of active sites, and r-GO is added to improve the conductivity. As a result, the modified α-Ni(OH)2 exhibits the specific capacitance of 2179, 1592, and 1423 F·g–1 at 1, 20, and 40 A·g–1, respectively, showing improved rate performance. Matching with the commercial activated carbon (AC) as an anode, the asymmetric capacitor delivers an energy density of 40.66 W·h·kg–1 when its power density is 187.06 W·kg–1. Meanwhile, it retains 81.5% capacitance of the initial cycle at 5 A·g–1 after 3000 cycles. With conductivity enhanced and structure stabilized, the modified α-Ni(OH)2 confronts broader fields of application.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
PubMed
高影响因子
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