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Gaojing Yang, Yejing Li, Yuxin Tong, Jiliang Qiu, Shuai Liu, Simeng Zhang, Zhaoruxin Guan, Bin Xu, Zhaoxiang Wang, Liquan Chen
Lithium metal is an ideal anode material due to its high specific capacity and low electrochemical potential. However, issues such as dendritic growth and low coulombic efficiency prevent its application in secondary lithium batteries. The use of three-dimensional (3D) porous current collector is an effective strategy to solve these problems. Herein, commercial carbon nanotube (CNT) sponge is used as a 3D current collector for dendrite-free lithium metal deposition to improve the coulombic efficiency and the cycle stability of the lithium metal batteries...
December 5, 2018: Nano Letters
Li Zhang, Xin Gu, Chunliu Yan, Shuo Zhang, Liangjun Li, Yingjie Jin, Shanlin Zhao, Haiyan Wang, Xuebo Zhao
Carbon coated SiO2/TiO2 (SiO2/TiO2@C) nanosheets consist of TiO2 nanoparticles uniformly embedded in SiO2 matrix and carbon coating layer are fabricated by using acidified titanosilicate JDF-L1 nanosheets as template and precursor. SiO2/TiO2@C has unique structural features of sheet-like nanostructure, ultrafine TiO2 nanoparticles distributed in SiO2 matrix and carbon coating, which can expedite ion diffusion and electron transfer, and relieve volume expansion efficiently, and thus the synergetic combination of these advantages significantly enhance their Li storage capability...
December 5, 2018: ACS Applied Materials & Interfaces
Sai Wang, Xin-Bo Zhang
Na-ion batteries (NIBs) are ideal candidates for solving the problem of large-scale energy storage, due to the worldwide sodium resource, but the efforts in exploring and synthesizing low-cost and eco-friendly anode materials with convenient technologies and low-cost raw materials are still insufficient. Herein, with the assistance of a simple calcination method and common raw materials, the environmentally friendly and nontoxic N-doped C@Zn3 B2 O6 composite is directly synthesized and proved to be a potential anode material for NIBs...
December 5, 2018: Advanced Materials
Paul Fassl, Simon Ternes, Vincent Lami, Yuriy Zakharko, Daniel Heimfarth, Paul Hopkinson, Fabian Paulus, Alexander Taylor, Jana Zaumseil, Yana Vaynzof
In this work, we examine the effect of microstructure on ion migration induced photoluminescence (PL) quenching in methylammonium lead iodide perovskite films. Thin films were fabricated by two methods: spin-coating, which results in randomly oriented perovskite grains, and zone-casting, which results in aligned grains. As an external bias is applied to these films, migration of ions causes a quenching of the PL signal in the vicinity of the anode. The evolution of this PL-quenched zone is less uniform in the spin-coated devices than in the zone-cast ones, suggesting that the relative orientation of the crystal grains plays a significant role in the migration of ions within polycrystalline perovskite...
December 5, 2018: ACS Applied Materials & Interfaces
Yingjie Li, Bolong Huang, Yingjun Sun, Mingchuan Luo, Yong Yang, Yingnan Qin, Lei Wang, Chunji Li, Fan Lv, Weiyu Zhang, Shaojun Guo
The development of cost-efficient, active, and stable electrode materials as bifunctional catalysts for electrochemical water splitting is crucial to high-performance renewable energy storage and conversion devices. In this work, the synthesis of Co-based multi-metal borides nanochains with amorphous structure is reported for boosting the oxygen evolution (OER) and hydrogen evolution reactions (HER) by one-pot NaBH4 reduction of Co2+ , Ni2+ , and Fe2+ under ambient temperature. In all the investigated Co-based metal borides, NiCoFeB nanochains show the excellent OER performance with a low overpotential of 284 mV at 10 mA cm-2 and Tafel slope of 46 mV dec-1 , respectively, together with excellent catalytic stability, and robust HER performance with an overpotential of 345 mV at 10 mA cm-2 ...
December 5, 2018: Small
Yipeng Sun, Yang Zhao, Jiwei Wang, Jianneng Liang, Changhong Wang, Qian Sun, Xiaoting Lin, Keegan R Adair, Jing Luo, Dawei Wang, Ruying Li, Mei Cai, Tsun-Kong Sham, Xueliang Sun
Metallic Li is considered as one of the most promising anode materials for next-generation batteries due to its high theoretical capacity and low electrochemical potential. However, its commercialization has been impeded by the severe safety issues associated with Li-dendrite growth. Non-uniform Li-ion flux on the Li-metal surface and the formation of unstable solid electrolyte interphase (SEI) during the Li plating/stripping process lead to the growth of dendritic and mossy Li structures that deteriorate the cycling performance and can cause short-circuits...
December 5, 2018: Advanced Materials
Weidong Zhou, Zhaoxu Wang, Yuan Pu, Yutao Li, Sen Xin, Xiaofang Li, Jianfeng Chen, John B Goodenough
No single polymer or liquid electrolyte has a large enough energy gap between the empty and occupied electronic states for both dendrite-free plating of a lithium-metal anode and a Li+ extraction from an oxide host cathode without electrolyte oxidation in a high-voltage cell during the charge process. Therefore, a double-layer polymer electrolyte is investigated, in which one polymer provides dendrite-free plating of a Li-metal anode and the other allows a Li+ extraction from an oxide host cathode without oxidation of the electrolyte in a 4 V cell over a stable charge/discharge cycling at 65 °C; a poly(ethylene oxide) polymer contacts the lithium-metal anode and a poly(N-methyl-malonic amide) contacts the cathode...
December 5, 2018: Advanced Materials
Qing Zhao, Michael J Zachman, Wajdi I Al Sadat, Jingxu Zheng, Lena F Kourkoutis, Lynden Archer
Electrochemical cells based on aluminum (Al) are of long-standing interest because Al is earth abundant, low cost, and chemically inert. The trivalent Al3+ ions also offer among the highest volume-specific charge storage capacities (8040 mAh cm-3 ), approximately four times larger than achievable for Li metal anodes. Rapid and irreversible formation of a high-electrical bandgap passivating Al2 O3 oxide film on Al have, to date, frustrated all efforts to create aqueous Al-based electrochemical cells with high reversibility...
November 2018: Science Advances
Xian Luo, Wenyue Xie, Ruijie Wang, Xiaoshuai Wu, Ling Yu, Yan Qiao
Microfluidic microbial fuel cells (MMFCs) are promising green power sources for future ultra-small electronic devices. The MMFCs with co-laminar microfluidic structure are superior to other MMFCs according to their low internal resistance and relative high power density. However, the area for interfacial electron transfer between the bacteria and the anode is quite limited in the typical Y-shaped device, which apparently restricts the current generation performance. In this study, we developed a membraneless MMFC with serpentine microchannel to enhance the interfacial electron transfer and promote the power generation of the device...
2018: Frontiers in Microbiology
Heon Lee, Byung-Joo Kim, Sun-Jae Kim, Young-Kwon Park, Sang-Chul Jung
Nitrogen-doped carbon nanotubes (NCNTs) and iron oxide particles precipitated on nitrogen-doped carbon nanotubes (IONCNTs) were fabricated by a liquid phase plasma (LPP) process for applications to anode materials in supercapacitors. The nitrogen element and amorphous iron oxide nanoparticles were evenly disseminated on the pristine multiwall carbon nanotubes (MWCNTs). The electrochemical performance of the NCNTs and IONCNTs were investigated and compared with those of pristine MWCNTs. The IONCNTs exhibited superior electrochemical performance to pristine MWCNTs and NCNTs...
November 30, 2018: International Journal of Molecular Sciences
Maria Serdechnova, Sergey A Karpushenkov, Larisa S Karpushenkava, Maksim Starykevich, Mario G S Ferreira, Theodor Hack, Mariia H Iuzviuk, Igor A Zobkalo, Carsten Blawert, Mikhail L Zheludkevich
In the frame of the current work, it was shown that plasma electrolytic oxidation (PEO) treatment can be applied on top of phosphoric sulfuric acid (PSA) anodized aluminum alloy AA2024. Being hard and well-adherent to the substrate, PEO layers improve both corrosion and wear resistance of the material. To facilitate PEO formation and achieve a dense layer, the systematic analysis of PEO layer formation on the preliminary PSA anodized layer was performed in this work. The microstructure, morphology, and composition of formed PEO coatings were investigated using scanning electron microscopy (SEM), x-ray diffraction (XRD), and glow-discharge optical emission spectroscopy (GDOES)...
November 30, 2018: Materials
Zhiyang Li, Chuqing Liu, Victor Sarpong, Zhiyong Gu
Antibiotics such as penicillin and tetracycline drugs are widely used in food animals to treat, control, and prevent diseases, and penicillin is approved for use to improve growth rates in pigs and poultry. However, due to the overuse of antibiotics in food and medical industry, the antimicrobial resistance is starting to show up in some developing countries. The antibiotic abuse may cause allergic reactions, resistance in microorganisms and general lowering of immunity in consumers of meat and dairy products...
October 17, 2018: Biosensors & Bioelectronics
Cheng Chen, Mengqiang Wu, Ziqiang Xu, Tingting Feng, Jian Yang, Zhi Chen, Sizhe Wang, Yuesheng Wang
Presently, carbon-based anodes for energy storage, such as graphite for lithium-ion batteries (LlBs) and hard carbon for sodium-ion batteries (SlBs), have low capacity and poor rate properties. However, the capacity and rate capability of these anodes can be improved via morphological control, doping and using nanostructures. In this report, a series of self-assembled N-doped porous carbon nanocomposites (NPCNs) were prepared via pyrolysis of metal-organic frameworks (MOFs)-ZIF-8/carbon nanocomposites grown on various carbon frameworks (1D CNT and/or 2D rGO)...
November 27, 2018: Journal of Colloid and Interface Science
Xiaoyu Jiang, Xingwei Liu, Ziqi Zeng, Lifen Xiao, Xinping Ai, Hanxi Yang, Yuliang Cao
Most of the currently developed sodium-ion batteries (SIBs) have potential safety hazards due to the use of highly volatile and flammable alkyl carbonate electrolytes. To overcome this challenge, we report an electrochemically compatible and nonflammable electrolyte, tris(2,2,2-trifluoroethyl) phosphate (TFEP) with low-concentration sodium bis(fluorosulfonyl)imide (0.9 M), which is designed not only to match perfectly with the hard carbon (HC) anode but also to enhance the thermal stability of SIBs. Experimental results and theoretical calculations reveal that TFEP molecules have a significantly low barrier to decompose before Na+ inserts into HC, forming a stable inorganic solid-electrolyte interface layer, thus improving the electrochemical and structural stabilities of HC anodes...
November 15, 2018: iScience
Daping Qiu, Ang Gao, Zhenyu Xie, Lun Zheng, Cuihua Kang, Yan Li, Nannan Guo, Min Li, Feng Wang, Ru Yang
It is a highly expected avenue to construct dual-carbon sodium-ion hybrid capacitors (SIHCs) using hierarchical porous carbon with interconnected pores, high accessible surface area and disordered carbon frameworks for ameliorating the sluggish kinetics of SIHCs. In this work, a novel dual-carbon SIHCs system with homologous enhanced kinetics hierarchical porous hollow carbon spheres (HPCS) and hierarchical porous hollow carbon bowls (HPCB) as the anode and cathode is constructed for the first time. In a Na half-cell configuration, the HPCS anode synthesized through a facile one-pot in-situ template route demonstrates a superior reversible capacity as well as outstanding rate capability and cycleability, and the HPCB cathode fabricated by chemical activation of HPCS exhibits excellent capacitive behaviors...
December 4, 2018: ACS Applied Materials & Interfaces
Yingge Zhang, Yan Guo, Yange Wang, Tao Peng, Yang Lu, Rongjie Luo, Yangbo Wang, Xianming Liu, Jang-Kyo Kim, Yongsong Luo
Structure pulverization and poor electrical conductivity of metal dichalcogenides result in serious capacity decay both in lithium-ion batteries (LIBs) and sodium-ion batteries (SIBs). To resolve the above problems, a combination of metal dichalcogenides with conductive scaffolds as high-performance electrode materials has aroused tremendous interest recently. Herein, we synthesize a 3D honeycomb-like rGO anchored with SnS2 quantum dots (3D SnS2 QDs/rGO) composite via spray-drying and sulfidation. The unique 3D-ordered honeycomb-like structure can confine the volume change of SnS2 QDs in the lithiation/delithiation and sodiation/desodiation processes, provide enough space for electrolyte reservoirs, promote the conductivity of the SnS2 QDs, and improve the electron transfer...
December 3, 2018: Nanoscale Research Letters
T Kirchgeorg, I Weinberg, M Hörnig, R Baier, M J Schmid, B Brockmeyer
Offshore wind energy is a fast growing sector of renewable energies worldwide. This will change the marine environment and thus, a wide range of environmental impacts of offshore wind farms are subject of current research. Here we present an overview about chemical emissions from corrosion protection systems, discuss their relevance and potential impact to the marine environment, and suggest strategies to reduce their emissions. Corrosion is a general problem for offshore infrastructures and corrosion protection systems are necessary to maintain the structural integrity...
November 2018: Marine Pollution Bulletin
Yang Deng, Chuanping Feng, Nan Chen, Weiwu Hu, Peijing Kuang, Hengyuan Liu, Zhengxia Hu, Rui Li
Biologically treated landfill leachate (BTLL) is typically characterized by significantly high amount of total nitrogen (TN) and chemical oxygen demand (COD), and it has low biodegradability. In this study, a joint electrochemical system (JES) composed of iron anode reactor (IAR) and Ti/RuO2 anode reactor (TAR) was constructed to remove both TN and COD from BTLL and improve its biodegradability. The IAR and TAR with the same structure but using different anodes. As a result, JES could simultaneously remove COD and TN by 90...
December 2018: Waste Management
Colin W J Lockwood, Jessica H van Wonderen, Marcus J Edwards, Samuel E H Piper, Gaye F White, Simone Newton-Payne, David J Richardson, Thomas A Clarke, Julea N Butt
Certain bacterial species have a natural ability to exchange electrons with extracellular redox partners. This behavior allows coupling of catalytic transformations inside bacteria to complementary redox transformations of catalysts and electrodes outside the cell. Electricity generation can be coupled to waste-water remediation. Industrially relevant oxidation reactions can proceed exclusively when electrons are released to anodes. Reduced products such as fuels can be generated when electrons are provided from (photo)cathodes...
2018: Methods in Enzymology
Saranya Sriram, Indumathi M Nambi, Raghuram Chetty
The present study demonstrates the potential utilization of urea/cow urine as anolyte for Cr(VI) reduction via a simple three-chambered electrolytic cell. The inherent chemical energy in the dual-waste stream (Cr(VI)-urea/urine) is employed for its self-oxidation-reduction without the need for any external energy supply. Ni foam as electroactive anode and catalyst-free carbon felt as cathode, along with the appropriate positioning of ion-selective separators, indirectly improved the cell performance by impeding electrolyte crossover...
November 30, 2018: Journal of Environmental Management
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