JOURNAL OF ALLOYS AND COMPOUNDS
·
2019
·
IF 4.175
Peng Hei,Chaozhu Shu,Zhiqian Hou,Ruixin Zheng,Tingshuai Yang,Minglu Li,Zhiqun Ran,Yue Wang,Dexin Mei,Jianping Long
In this work, we fabricated a novel free-standing Fe doped CoP nanowire on carbon cloth (Fe–CoP/CC) electrode with high catalytic activity for Li–O 2 batteries. It is unexpected that the Li–O 2 battery with Fe–CoP/CC electrode demonstrated a low potential of 0.8 V and exceptional cycle stability of more than 500 cycles with no significant voltage attenuation compared with previously reported counterparts. Such excellent performance can be partly attributed to its fine nanowire structure and its large specific surface area (419.14 m 2 g −1 ). Furthermore, iron doping plays a crucial role in improvement of battery performance because the doped Fe can modulate the internal electronic structure and optimize the absorption of intermediate products, which have been proved to be the determinant for optimizing the catalytic activity. Thus, it is believed that heterogeneous element doping in binary or ternary metal compounds is a promising strategy to fabricate high performance oxygen electrode materials for Li–O 2 batteries in the next few years.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2017
·
IF 6.216
Fan Yang,Tian Qiu,Cheng Chi,Shuang Liang,Lei Deng,Xuyang Wang,Chunxia Wang,Jingyi Fu,Ying Wang,Yongfeng Li
Promotion of nitrogen-doped graphene (NG) by incorporation of ferric oxide (NG-Fe 2 O 3 ) is found to strongly enhance the activity in the catalytic oxidization of aldehyde to synthesize carboxylic acid with O 2 . The composite NG-Fe 2 O 3 catalysts can be fabricated by a facile one-pot hydrothermal method. The characterization results of the composite catalysts have revealed that the Fe 2 O 3 nanoparticles (NPs) with sizes of 40–90 nm are not only on both sides of NG sheets but also tightly enwrapped by the graphene layers. In comparison to NG and Fe 2 O 3 NPs, synergistic adsorption that confirmed by DFT studies has been created on the NG-Fe 2 O 3 composites, where both NG and Fe 2 O 3 are proposed to be involved in the adsorptive interaction. The synergistic adsorption can lead to strengthen O 2 molecule adsorption of NG and weaken O 2 molecule adsorption of Fe 2 O 3 NPs. More importantly, the NG-Fe 2 O 3 composite is found to considerably facilitate the longest elongation of O-O bonds and contribute to the striking enhancement of the catalytic performance. The highly active NG-Fe 2 O 3 composite shows wide scope for catalysis of oxidation of aldehydes to carboxylic acids and good stability for recycle six times.
✓ 已验证
DOI
高影响因子
MATERIALS RESEARCH BULLETIN
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2015
·
IF 2.288
Ming Song,Xihua Du,Yan Chen,Lei Zhang,Ding Zhu,Yungui Chen
Among all the factors that restrict the application of Li–air battery, large charging polarization, due to the poor bulk charge transport ability of discharge product Li 2 O 2 , comes first. In this paper, we adopt the method of controlling discharging temperature to reduce the charging polarization during the first cycle of Li 2 O 2 based on the fact that controlling discharging temperature can reduce Li 2 O 2 bulk charge transport path since finer Li 2 O 2 particles can be observed at higher temperature. The mechanism of reducing charging polarization simply through increasing the discharging test temperature has also been researched in this paper.
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 SOLID STATE ELECTROCHEMISTRY
·
2015
·Vol. 19
·期 8
·2421-2429
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IF 2.446
Wang Xiaofei,Cai Shengrong,Zhu Ding,Mu Shijia,Chen Yungui
A lithium (Li)–oxygen (O 2 ) battery based on an inorganic solid-state air cathode was fabricated, and the influence of water vapor (key component in the air) on the electrochemical behavior of the proposed Li–O 2 battery was deeply investigated. Excluding the negative influence of the corrosion of Li anode that existed in organic-based electrolyte Li–O 2 battery when operated in wet environment, our results showed that water vapor has a positive effect on the discharge and cycling performances of the Li–O 2 battery using a solid-state air cathode. The discharge capacity reached 11734 mA h g −1 (7.8 mA h cm −2 ) in wet O 2 , which was not markedly different with that in dry O 2 (11956 mA h g −1 (8.0 mA h cm −2 )). However, the discharge voltage in wet O 2 was about 110 mV higher than that in dry O 2 . Although the formation of LiOH increased the charge overpotential, the formed LiOH in turn minimized the decomposition of carbon to form Li 2 CO 3 , and enhanced the cycling performance to a certain extent. In addition, we showed that the polarization involved by water vapor could also be largely decreased by slightly increasing the operating temperature; the charge voltage plateau decreased from 4.04 to 3.3 V when the temperature increased from 25 to 50 °C. These results suggest that the Li–O 2 battery using a solid-state air cathode is promising for practical application, especially in wet environment.
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
CHEMICAL ENGINEERING JOURNAL
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2017
·
IF 6.216
Hongying Zhao,Lin Qian,Ying Chen,Qingning Wang,Guohua Zhao
The selective two-electron oxygen reduction reaction (ORR) for an onsite Fenton oxidation reaction over an integrated cathode is a promising method for environmental restoration. Here, an economic iron-copper-embedded carbon aerogel (FeCuC) exhibited high ORR activity (half-wave potential of −0.19 V vs SCE). The electron transfer number (n) over FeCuC was 2.9. Indeed, Fe@Fe 3 C promoted the ORR activity, while Cu enhanced the selectivity of the two-electron ORR. Meanwhile, the simultaneous incorporation of Fe and Cu simultaneously facilitated the sequential Fenton oxidation induced by H 2 O 2 . The individual rate constants for ORR and the oxidation reaction successfully revealed the fact that the efficient Fenton oxidation reaction again promotes again the 2-electron O 2 reduction pathway. The application of FeCuC as a cathode in the electro-Fenton (EF) process, involving both high ORR and high Fenton oxidation activities, exhibited efficient total organic carbon (TOC) removal (88–99%) in 240 min for dimethyl phthalate (DMP), imidacloprid (IMI), bisphenol A (BPA) and perfluorooctanoate (PFOA). Moreover, five types of sanitary sewage were successively treated to meet the national discharge standards (chemical oxygen demand (COD) < 50 mg L −1 ) with relatively low specific energy consumption (20–40 kW·h·(kg COD ) −1 ) using FeCuC in the heterogeneous EF process.
研究领域:
环境科学
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电化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF NANOBIOTECHNOLOGY
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2021
·Vol. 19
·期 1
·1-14
·
IF 10.435
Zhang Tian,Zheng Qiang,Fu Yike,Xie Congkun,Fan Gonglin,Wang Yifan,Wu Yongjun,Cai Xiujun,Han Gaorong,Li Xiang
Sonodynamic therapy (SDT), presenting spatial and temporal control of ROS generation triggered by ultrasound field, has attracted considerable attention in tumor treatment. However, its therapeutic efficacy is severely hindered by the intrinsic hypoxia of solid tumor and the lack of smart design in material band structure. Here in study, fine α-Fe 2 O 3 nanoparticles armored with Pt nanocrystals (α-Fe 2 O 3 @Pt) was investigated as an alternative SDT agent with ingenious bandgap and structural design. The Schottky barrier, due to its unique heterostructure, suppresses the recombination of sono-induced electrons and holes, enabling superior ROS generation. More importantly, the composite nanoparticles may effectively trigger a reoxygenation phenomenon to supply sufficient content of oxygen, favoring the ROS induction under the hypoxic condition and its extra role played for ultrasound imaging. In consequence, α-Fe 2 O 3 @Pt appears to enable effective tumor inhibition with imaging guidance, both in vitro and in vivo. This study has therefore demonstrated a highly potential platform for ultrasound-driven tumor theranostic, which may spark a series of further explorations in therapeutic systems with more rational material design. Graphical Abstract
研究领域:
纳米技术
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生物医学工程
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癌症治疗
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材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Advanced Energy Materials
·
2022
·Vol. 12
·期 12
·2102764
·
IF 29.698
Zongqiang Sun,Xiaodong Lin,Wenjie Dou,Yanyan Tan,Ajuan Hu,Qing Hou,Ruming Yuan,Mingsen Zheng,Quanfeng Dong
The large charge overpotential and poor cycling stability triggered by sluggish Li 2 O 2 oxidation kinetics and severe superoxide-related side reactions greatly restrict the development and application of lithium–oxygen batteries. Finding out high-efficiency catalysts that can effectively facilitate a highly reversible formation/decomposition of lithium peroxide is still a crucial challenge in the field of Li–O 2 batteries. Herein, a soluble catalyst of 2,2'-Azino-bis(3-ethylbenzothiazoline-6-sulfonic acid) diammonium salt (ABTS) that can promote highly reversible formation and decomposition of Li 2 O 2 during discharge and charge processes is reported for the first time. During discharge, it can capture and couple two LiO 2 intermediates via its sulfonate and ammonium ions, and induce the intramolecular disproportionation reaction to produce Li 2 O 2 through ionic microenvironment, which not only prompts the solution-phase growth of Li 2 O 2 , but also restricts the reactivity of LiO 2 intermediate, thus significantly alleviating the electrode surface passivation issue and suppressing the superoxide-related side reactions. During charge, it can quickly transport electrons between the electrode and Li 2 O 2 by serving as a new kind of redox mediator (RM), thus greatly facilitating the Li 2 O 2 oxidation kinetics. As a result, the Li–O 2 batteries that incorporate ABTS exhibit outstanding electrochemical performance, low charge overpotential, high discharge capacity, and high cycling stability.
研究领域:
能源化学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2020
·
IF 4.65
Junfang Cheng,Ziling Wang,Lu Zou,Ming Zhang,Guozhu Zhang,Yabin Dong,Yuexing Jiang,Yizhen Huang,Naotoshi Nakashima,Bo Chi
Perovskite oxides with low cost and high catalytic activity are reported as suitable cathode catalysts for the Li–O 2 batteries (LOBs), while their catalytic mechanism is not yet fully clarified. Herein, La 0.8 Sr 0.2 Co 0.8 Ni 0.2 O 3-δ (LSCN8282) perovskite oxide is used as a cathode catalyst for the LOBs and further improved by adjusting the Co/Ni ratio in the B-site. Thus, La 0.8 Sr 0.2 Co 0.6 Ni 0.4 O 3-δ (LSCN8264) and La 0.8 Sr 0.2 Co 0.4 Ni 0.6 O 3-δ (LSCN8246) are also synthesized and used as cathode catalysts for the LOBs. Among the obtained perovskite catalysts in this study, LSCN8264 shows the highest electrochemical activity in 1 M KOH and best catalytic effectivity when used in the LOBs. The catalytic mechanism and doping optimization are clarified by analyzing the morphology of the discharge products and the X-ray photoelectron spectroscopy (XPS) of the perovskite oxides.
研究领域:
材料科学
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电化学
·
能源存储
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2022
·
IF 4.598
Deyu Mao,Shenglong Yi,Zirui He,Qiancheng Zhu
Lithium-oxygen (Li-O 2 ) batteries with high theoretical energy density are well developed over the past decade, as the cycle performance and round-trip efficiency had enhanced prominently. However, there are still several obstacles that need to be tackled before commercial application. Among them, proper cathode structure design with low cost stands as a core problem. A Typical type of gas diffusion layer cathode are usually carbon paper, which is valuableness, meanwhile, cannot fit the application of flexible devices. In this work, non-woven fabrics were applied as basis materials to synthesis Fe 3 C/N-doped carbon tubes gas diffusion layer by a simple carbonization method. The resulting carbon cloth can be used directly as binder-free and current collector-free cathode for Li-O 2 batteries. More than 130 stable cycles were achieved. The composite synthesized in this paper has the possibility for future application in flexible lithium-oxygen batteries and provide a new strategy for the recovery of non-woven fabrics.
研究领域:
材料科学
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能源技术
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
·
2022
·Vol. 169
·期 6
·060507
·
IF 4.386
Zining Man,Hao Tian,Xingbao Zhu,Yu Wang,Yuanguo Wu,Xiangyu Wen,Zhe Lü
The solid-state batteries have received widespread attention due to their excellent stability and safety, however, the low ionic conductivity and weak interface contact always restricted its performance. In this work, we propose an in situ thermally cross-linked and solidified polymer electrolyte with polyethylene glycol diacrylate (PEGDA) as scaffold in which succinonitrile (SN) and lithium bis-trifluoromethanesulfonimide (LiTFSI) were further introduced to improve the ionic conductivity. Herein, the composite gel was served as not only solid-solid interface material but also solid-state electrolyte. Different with conventional polymer gels, the solvent evaporation could not happen for this composite material during the solidification process, and therefore resulting in good interface contact without inside bubbles. We further present the investigation on transport principle of Li+ in the solid-state electrolyte and the effect of molecular chain on ionic conductivity. The conductivity of the solid-state electrolyte can reach 1.76 × 10−4 S cm−1 at room temperature without any assistance of liquid electrolytes, which is attributed to the short molecular chain of PEGDA. Electrochemical window of the solid-state electrolyte can reach 5.2 V after cross-linking treatment. And the lithium-oxygen battery using this solid-state electrolyte can stably cycle for more than 1100 cycles with a current density of 200 mA g−1 and a limit capacity of 200 mAh g−1 at room temperature.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
Nanomaterials
·
2022
·Vol. 12
·期 11
·1931
·
IF 5.719
Shaohong Zang,Xiaorong Cai,Mengshan Chen,Dehong Teng,Fei Jing,Zhe Leng,Yingtang Zhou,Feng Lin
Photocatalytic water splitting is one of the promising approaches to solving environmental problems and energy crises. However, the sluggish 4e−transfer kinetics in water oxidation half-reaction restricts the 2e−reduction efficiency in photocatalytic water splitting. Herein, cobalt vanadate-decorated polymeric carbon nitride (named CoVO/PCN) was constructed to mediate the carrier kinetic process in a photocatalytic water oxidation reaction (WOR). The photocatalysts were well-characterized by various physicochemical techniques such as XRD, FT-IR, TEM, and XPS. Under UV and visible light irradiation, the O2evolution rate of optimized 3wt% CoVO/PCN reached 467 and 200 μmol h−1g−1, which were about 6.5 and 5.9 times higher than that of PCN, respectively. Electrochemical tests and PL results reveal that the recombination of photogenerated carriers on PCN is effectively suppressed and the kinetics of WOR is significantly enhanced after CoVO introduction. This work highlights key features of the tuning carrier kinetics of PCN using charge-conducting materials, which should be the basis for the further development of photocatalytic O2reactions.Keywords:photocatalysis;water oxidation;cobalt vanadates;polymeric carbon nitride
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Applied Energy Materials
·
2022
·
IF 6.959
Sisi Wu,Jing Yang,Ning Qin,Yingzhi Li,Haiou Wang,Yong-Wei Zhang,Qing Wang,Zhouguang Lu
LiO2 is a critical intermediate of oxygen reduction reaction in nonaqueous Li–O2 batteries that largely determines the discharge capacity and cycling stability. Currently, functional redox mediators that can promote the solution reaction route by enhancing the solvation of LiO2 have attracted tremendous interest to increase the attainable capacity. Conversely, redox mediators that quench LiO2 and facilitate the surface reaction route receive little attention. Here, we provide an in-depth exploration of the catalytic pathway and effect of a superoxide quencher that modulates the surface growth of Li2O2. Surprisingly, the predomination of the surface reaction route by ethyl viologen helps deliver a capacity as much as that promoted by the solution reaction route. The findings of this work provide a new direction of screening and evaluating functioning redox mediators for Li–O2 batteries.
研究领域:
材料科学
·
电化学
·
能源存储
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）