SCIENCE OF THE TOTAL ENVIRONMENT
·
2021
·
IF 7.963
Ran Yang,Jun Cai,Hu Yang
Zero-valent aluminum (ZVAl) is a promising reductant because of its relatively low redox potential , which can efficiently activate molecular oxygen to generate reactive oxygen species . However, its long-term performance is limited by the intrinsic dense oxide layer and the passivation effect of the accumulative Al-(hydr)oxide on its surface during the reaction. In this study, four clay minerals with different compositions were mixed with ZVAl by ball milling to obtain four composites of ZVAl and clay (ZVAl-Clay), which were used to degrade a high concentration of 4-chlorophenol (4-CP) under ambient conditions. The oxidation efficiencies of different ZVAl-Clays were strongly relevant to Fe contained in the clay minerals. The Fe-free ZVAl-Clay presented poor oxidation performance, whereas the reaction efficiencies of those ZVAl composites with Fe-bearing clays exhibited varying degrees of improvement. In comparison with the original ZVAl, the highest oxidation rate increased by 23 times, the maximum increased OH production was approximately 8 times, and the corresponding mineralization efficiency improved by 38.7%. However, the levels of improved oxidation performance of various ZVAl-Clays were not positively correlated with their actual total Fe contents, and their degradation efficiencies might also be affected by other physical and/or chemical properties of different clays. The synergistic mechanism revealed by various characterizations was that electron transfer might occur from ZVAl to the structural Fe(III) of the clay through the basal plane or edge of clays triggered by ball milling. Thus, the partially produced Fe(II) on the clay surface promoted the Fenton-like reaction to decompose H 2 O 2 into OH for efficient oxidation of 4-CP. In short, the ZVAl composites with Fe-bearing clays deserved further exploration as potential materials for efficient degradation of organic matters in wastewater samples.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
PubMed
高影响因子
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
·
2017
·Vol. 164
·期 6
·A1321
·
IF 3.259
Chaolumen Wu,Taoran Li,Chenbo Liao,Qingkai Xu,Yuancheng Cao,Lei Li,Jun Yang
Triethylene glycol dimethyl ether (G3) is evaluated as an electrolyte solvent for non-aqueous lithium-oxygen (Li-O2) batteries. A liquid electrolyte of 1 M LiTFSI in G3 shows lower viscosity, higher oxygen solubility and diffusion, higher ionic conductivity and lithium ionic transference number compared to the conventional liquid electrolyte of 1 M LiTFSI in tetraethylene glycol dimethyl ether (G4). Then the Li-O2 battery using the G3-based electrolyte shows better cycling stability and higher rate capability compared to the battery using the G4-based electrolyte. At a higher current density of 2.5 A gcarbon−1, the discharge capacity of the battery using the G3-based electrolyte is about 1472 mAh gcarbon−1, which is about four times higher than that of the battery using the G4-based electrolyte. At current density of 1 A gcarbon−1 with a fixed capacity of 1000 mAh gcarbon−1, the battery using the G3-based electrolyte can be operated stably for 80 cycles, while only 20 cycles are achieved by using the G4-based electrolyte. Therefore, we think the G3-based electrolyte could be a proper alternative electrolyte to the conventional G4-based electrolyte for the development of Li-O2 batteries.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2024
·
IF 5.8
Tie Liu
The geometric design of atomically dispersed 'framework-active sites' grafted with carbonaceous materials to establish a well-connected three-dimensional network represents a compelling strategy for enhancing the performance of lithium-oxygen batteries, particularly in terms of cyclability. This paper introduces a simple approach that utilizes self-assembly heterogeneous nucleation to fabricate discrete bimetallic (Co, Ni) micron lattices grafted onto CNTs, exhibiting commendable surface properties. This intriguing hierarchical structure optimally harnesses the profound structural effects of CNTs weaving matrix, thereby imparting essential properties to the cathode, including high catalytic activity, intrinsically accessible active sites, and continuous porosity to accommodate discharge products. And such binary metal-nitride grafted configuration is significant in mitigating the embarrassing presence of nitrides (low conductivity) and carbon material (inferior activity). Consequently, cell measurement results indicate that a comparable capacity of 8599.7 mA h g⁻¹ and cyclic performance exceeding 200 cycles are achieved in a semi-solid state battery, outperforming commercially available RuC catalysts. And the DFT calculations further demonstrate the strong electronic coupling transfer and exceptional bifunctional activity observed in this binary metal-nitride sample. Therefore, this work exemplifies both steerable preparation techniques and the considerable potential inherent in geometric design for bimetallic sites grafted with carbonaceous material-based catalysts as they transition from Li-O 2 to Li-air batteries.
研究领域:
材料科学
·
电化学
·
纳米技术
✓ 已验证
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2022
·
IF 7.336
Panpan Zhao,He Zhang,Xiaoxuan Sun,Shuai Hao,Shaojun Dong
In this work, combining poly (methylene green)/glucose dehydrogenase (PMG/GDH) bioanode with Prussian blue/glucose oxidase (PB/GOD) biocathode, we developed a hybrid bioelectrochemical device based on glucose/O 2 enzymatic biofuel cell (EBFC) to achieve energy conversion and storage. Depending on the reversible redox behaviors, PMG and PB play roles of dual-functional nanomaterials , not only as mediators to accelerate electrons transport between enzymes and electrodes surface, but also as pseudocapacitive materials to achieve energy storage. As a result, this hybrid device exhibited superior performance towards energy storage with a specific capacitance of 158.5 mF cm −2 at the current density of 1 mA cm −2 . Meanwhile, a maximum output power density of 783.5 μW cm −2 in the pulse mode could be obtained, which had a prominent increment than that of the prototypical EBFC (87.5 μW cm −2 ) in the steady state. Furthermore, this hybrid device also exhibited better operational stability in long-term charge/discharge cycles test, at the current pulse of 1 mA cm −2 . Through the combination of bioelectrocatalysis and capacitive energy storage, this developed hybrid device achieves effective energy conversion and storage, and provides a high output power to address the insufficient power supply of traditional EBFCs, which may enlarge the practical application of EBFCs in self-powered implantable and wearable devices .
研究领域:
生物电化学
·
能量存储
·
材料科学
·
生物医学工程
✓ 已验证
DOI
高影响因子
Advanced Materials Interfaces
·
2017
·Vol. 4
·期 23
·1700693
·
IF 4.279
Kailiang Liu,Hongguang Sun,Shanmu Dong,Chenglong Lu,Yang Li,Junmei Cheng,Jianjun Zhang,Xiaogang Wang,Xiao Chen,Guanglei Cui
The increasing interest in Li–O 2 battery arises from its unparalleled theoretical energy density. Nevertheless, the poor reversibility of cathode reaction and unstable characteristic of Li anode hinder its further application. To address these issues, a high-performance sandwich-structured quasisolid polymer electrolyte (QSPE) is designed to meet the requirement of both cathode and anode. For the first time, lithiated Nafion ionomer (Li-Nafion) is introduced into Li–O 2 cell to separate “catholyte” and “anolyte.” Redox mediator (RM) is introduced into gel-like catholyte, based on polymethymethacrylate, to achieve high capacity and reversibility. Polypropylene carbonate is chosen as solid-state anolyte for enhancing interface stability of lithium anode. It is demonstrated that the QSPE exhibits excellent permselectivity to block RM shuttling, as well as good ionic conductivity and high electrochemical window. A solution mechanism formation of discharge product is demonstrated in the Li–O 2 cell with QSPE and the RM works well for cycles at room temperature. This sandwich-structured design strategy will provide a new pathway to promote the properties of Li–O 2 battery.
研究领域:
储能
·
电化学
·
材料科学
·
电池技术
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
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
·
电化学
·
能源存储
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
·
2020
·Vol. 45
·期 5
·7120-7128
·
IF 3.741
Menglu He,Jia Jia,Qing Sun,Weixin Zhang
SUMMARY Li-O 2 battery has attracted much attention due to its ultra-high theoretical energy density in the field of electrochemical energy storage. The introduction of efficient electrocatalyst can effectively accelerate the reaction rate of ORR and OER, so as to improve the coulomb efficiency and poor cycle stability of Li-O 2 battery. In this work, a novel hollow N-doped carbon sphere is prepared by using MOF and polystyrene as template, and act as highly efficient oxygen electrocatalyst for rechargeable Li-O 2 batteries. The hollow structure can provide enough oxygen diffusion channel, deposition and decomposition space for reduction products. N doping into the hollow carbon structure can increase the charge density of adjacent carbon atoms and enhance its catalytic activity of ORR/OER. As a result, the Li-O 2 battery using the hollow N-doped carbon sphere as air cathode exhibited an high specific capacity of 18 762 mAh/g (at a current density of 500 mA/g) and remarkable cycling stability of 212 cycles (at a current density of 500 mA/g and limited capacity of 1000 mAh/g), outperforming the carbon material with common structure. This work highlights the importance of air cathode structure and efficient catalyst, provides a new idea for the design of air cathode of Li-O 2 battery, and expands the scope of future research.
研究领域:
材料科学
·
电化学能源存储
✓ 已验证
产品关联
DOI
高影响因子
MATERIALS RESEARCH BULLETIN
·
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
Nanoscale
·
2019
·Vol. 11
·期 12
·5285-5294
·
IF 6.97
Yunzhao Liu,Xiaowei Chi,Qi Han,Yuexiu Du,Jiaqi Huang,Xinghao Lin,Yu Liu
The Na–O2 battery system is attracting increasing attention due to its superiority in specific capacity and cost. However, its practical implementation is hindered by many issues, such as high charge–discharge overpotential, limited cycling life, and poor reversibility, all of which result from the mediocre O2 electrode. Herein, to surmount these critical challenges, hierarchical Co3O4@MnCo2O4.5 nanocubes (h-Co3O4@MnCo2O4.5 Ns) with a yolk–shell structure are designed for the first time as the novel O2 electrode. h-Co3O4@MnCo2O4.5 Ns are synthesized from a metal–organic framework via a template-assisted method, which is demonstrated to be helpful in creating a high specific surface area of 130.4 m2 g−1, a hierarchical macro- and mesoporous structure, and synergistic yolk-shelled Co3O4@MnCo2O4.5 active sites. These unique structural properties endow h-Co3O4@MnCo2O4.5 Ns with remarkably enhanced electrocatalytic activity towards both the ORR and OER. The Na–O2 battery based on h-Co3O4@MnCo2O4.5 Ns displays an ultrahigh initial discharge capacity of 8400 mA h g−1, ultralow charge–discharge overpotential of 0.45 V, long cycling life of 135 cycles, and excellent rate capability.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
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
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
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2021
·
IF 5.816
Shaolong Wang,Dingding Ye,Hao Liu,Xun Zhu,Zhenfei Liu,Rong Chen,Qiang Liao,Yang Yang
The in-situ H 2 O 2 electrosynthesis by two-electron oxygen reduction reaction employing renewable electricity is a promising alternative to traditional anthraquinone process due to its security, environmental friendliness and excellent cost effectiveness, which requires high-performance, cost-effective and environmental-friendly electrocatalysts . A bamboo-derived O-doped rocky electrocatalyst is developed by facile pyrolysis and acid treatment for high-efficiency electroreduction of O 2 to H 2 O 2 . Three-dimensional interconnected hierarchical pores in rocky electrocatalysts expose abundant electroactive sites and facilitate mass transfer of reaction species. From the results of rotating ring-disk electrode test, a H 2 O 2 selectivity up to 80% and superior electrocatalytic activity of the prepared electrocatalyst are achieved by surface oxygen functionalization induced by acid treatment. At the optimal catalyst loading of 2 mg cm −2 , prominent H 2 O 2 productivity of 1037 mmol g c a t a l y s t − 1 h − 1 with high current efficiency up to 74.1% is achieved at 30 mA cm −2 by air-breathing cathode. Higher H 2 O 2 productivity (1525 mmol g c a t a l y s t − 1 h − 1 ) is yielded by further raising the current density to 50 mA cm −2 . Moreover, the durability test of the cathode through ten consecutive runs demonstrates its great stability for electrocatalytic generation of H 2 O 2 . This work inspires the development of promising biomass-derived electrocatalysts for green and sustainable on-site H 2 O 2 electrosynthesis.
研究领域:
材料科学
·
环境科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）