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Advanced Materials

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https://read.qxmd.com/read/30786067/new-organic-electrode-materials-for-ultrafast-electrochemical-energy-storage
#1
REVIEW
Zhirong Zhao-Karger, Ping Gao, Thomas Ebert, Svetlana Klyatskaya, Zhi Chen, Mario Ruben, Maximilian Fichtner
Organic materials are both environmentally and economically attractive as potential electrode candidates. This Research News reports on a new class of stable and electrically conductive organic electrodes based on metal porphyrins with functional groups that are capable of electrochemical polymerization, rendering the materials promising for electrochemical applications. Their structural flexibility and the unique highly conjugated macrocyclic structure allows the produced organic electrodes to act as both cathode and anode materials giving access to fast charging as well as high cycling stability...
February 20, 2019: Advanced Materials
https://read.qxmd.com/read/30786064/2d-organic-hybrid-heterostructures-for-optoelectronic-applications
#2
REVIEW
Jia Sun, Yongsuk Choi, Young Jin Choi, Seongchan Kim, Jin-Hong Park, Sungjoo Lee, Jeong Ho Cho
The unique properties of hybrid heterostructures have motivated the integration of two or more different types of nanomaterials into a single optoelectronic device structure. Despite the promising features of organic semiconductors, such as their acceptable optoelectronic properties, availability of low-cost processes for their fabrication, and flexibility, further optimization of both material properties and device performances remains to be achieved. With the emergence of atomically thin 2D materials, they have been integrated with conventional organic semiconductors to form multidimensional heterostructures that overcome the present limitations and provide further opportunities in the field of optoelectronics...
February 20, 2019: Advanced Materials
https://read.qxmd.com/read/30785651/edge-segregated-polymorphism-in-2d-molybdenum-carbide
#3
Xiaoxu Zhao, Weiwei Sun, Dechao Geng, Wei Fu, Jiadong Dan, Yu Xie, Paul R C Kent, Wu Zhou, Stephen J Pennycook, Kian Ping Loh
Molybdenum carbide (Mo2 C), a class of unterminated MXene, is endowed with rich polymorph chemistry, but the growth conditions of the various polymorphs are not understood. Other than the most commonly observed T-phase Mo2 C, little is known about other phases. Here, Mo2 C crystals are successfully grown consisting of mixed polymorphs and polytypes via a diffusion-mediated mechanism, using liquid copper as the diffusion barrier between the elemental precursors of Mo and C. By controlling the thickness of the copper diffusion barrier layer, the crystal growth can be controlled between a highly uniform AA-stacked T-phase Mo2 C and a "wedding cake" like Mo2 C crystal with spatially delineated zone in which the Bernal-stacked Mo2 C predominate...
February 20, 2019: Advanced Materials
https://read.qxmd.com/read/30785649/voltage-control-of-magnetism-in-all-solid-state-and-solid-liquid-magnetoelectric-composites
#4
REVIEW
Alan Molinari, Horst Hahn, Robert Kruk
The control of magnetism by means of low-power electric fields, rather than dissipative flowing currents, has the potential to revolutionize conventional methods of data storage and processing, sensing, and actuation. A promising strategy relies on the utilization of magnetoelectric composites to finely tune the interplay between electric and magnetic degrees of freedom at the interface of two functional materials. Albeit early works predominantly focused on the magnetoelectric coupling at solid/solid; however, recently there has been an increased interest related to the opportunities offered by liquid-gating techniques...
February 20, 2019: Advanced Materials
https://read.qxmd.com/read/30785644/materials-and-designs-for-wearable-photodetectors
#5
REVIEW
Sa Cai, Xiaojie Xu, Wei Yang, Jiaxin Chen, Xiaosheng Fang
Photodetectors (PDs), as an indispensable component in electronics, are highly desired to be flexible to meet the trend of next-generation wearable electronics. Unfortunately, no in-depth reviews on the design strategies, material exploration, and potential applications of wearable photodetectors are found in literature to date. Thus, this progress report first summarizes the fundamental design principles of turning "hard" photodetectors "soft," including 2D (polymer and paper substrate-based devices) and 1D PDs (fiber shaped devices)...
February 20, 2019: Advanced Materials
https://read.qxmd.com/read/30785234/interface-driven-partial-dislocation-formation-in-2d-heterostructures
#6
Jung Hwa Kim, Se-Yang Kim, Yeonchoo Cho, Hyo Ju Park, Hyeon-Jin Shin, Soon-Yong Kwon, Zonghoon Lee
Van der Waals (vdW) epitaxy allows the fabrication of various heterostructures with dramatically released lattice matching conditions. This study demonstrates interface-driven stacking boundaries in WS2 using epitaxially grown tungsten disulfide (WS2 ) on wrinkled graphene. Graphene wrinkles function as highly reactive nucleation sites on WS2 epilayers; however, they impede lateral growth and induce additional stress in the epilayer due to anisotropic friction. Moreover, partial dislocation-driven in-plane strain facilitates out-of-plane buckling with a height of 1 nm to release in-plane strain...
February 20, 2019: Advanced Materials
https://read.qxmd.com/read/30785225/ferroelectric-properties-of-perovskite-thin-films-and-their-implications-for-solar-energy-conversion
#7
REVIEW
Holger Röhm, Tobias Leonhard, Alexander D Schulz, Susanne Wagner, Michael J Hoffmann, Alexander Colsmann
Whether or not methylammonium lead iodide (MAPbI3 ) is a ferroelectric semiconductor has caused controversy in the literature, fueled by many misunderstandings and imprecise definitions. Correlating recent literature reports and generic crystal properties with the authors' experimental evidence, the authors show that MAPbI3 thin-films are indeed semiconducting ferroelectrics and exhibit spontaneous polarization upon transition from the cubic high-temperature phase to the tetragonal phase at room temperature...
February 20, 2019: Advanced Materials
https://read.qxmd.com/read/30785223/from-single-molecules-to-thin-film-electronics-nanofibers-e-textiles-and-power-cables-bridging-length-scales-with-organic-semiconductors
#8
REVIEW
Christian Müller, Liangqi Ouyang, Anja Lund, Kasper Moth-Poulsen, Mahiar M Hamedi
Organic semiconductors are the centerpiece of several vibrant research fields from single-molecule to organic electronics, and they are finding increasing use in bioelectronics and even classical polymer technology. The versatile chemistry and broad range of electronic functionalities of conjugated materials enable the bridging of length scales 15 orders of magnitude apart, ranging from a single nanometer (10-9 m) to the size of continents (106 m). This work provides a taste of the diverse applications that can be realized with organic semiconductors...
February 20, 2019: Advanced Materials
https://read.qxmd.com/read/30785222/ultrathin-cobalt-oxide-layers-as-electrocatalysts-for-high-performance-flexible-zn-air-batteries
#9
Tianpei Zhou, Wanfei Xu, Nan Zhang, Zhiyi Du, Chengan Zhong, Wensheng Yan, Huanxin Ju, Wangsheng Chu, Hong Jiang, Changzheng Wu, Yi Xie
Synergistic improvements in the electrical conductivity and catalytic activity for the oxygen reduction reaction (ORR)/oxygen evolution reaction (OER) are of paramount importance for rechargeable metal-air batteries. In this study, one-nanometer-scale ultrathin cobalt oxide (CoOx ) layers are fabricated on a conducting substrate (i.e., a metallic Co/N-doped graphene substrate) to achieve superior bifunctional activity in both the ORR and OER and ultrahigh output power for flexible Zn-air batteries. Specifically, at the atomic scale, the ultrathin CoOx layers effectively accelerate electron conduction and provide abundant active sites...
February 20, 2019: Advanced Materials
https://read.qxmd.com/read/30785220/heterostructure-of-1d-ta-3-n-5-nanorod-batao-2-n-nanoparticle-fabricated-by-a-one-step-ammonia-thermal-route-for-remarkably-promoted-solar-hydrogen-production
#10
Beibei Dong, Junyan Cui, Yuying Gao, Yu Qi, Fuxiang Zhang, Can Li
Heterostructures are widely fabricated for promotion of photogenerated charge separation and solar cell/fuel production. (Oxy)nitrides are extremely promising for solar energy conversion, but the fabrication of heterostructures based on nitrogen-containing semiconductors is still challenging. Here, a simple ammonia thermal synthesis of a heterostructure (denoted as Ta3 N5 /BTON) composed of 1D Ta3 N5 nanorods and BaTaO2 N (BTON) nanoparticles (0D), which is demonstrated to result in a remarkable increase in photogenerated charge separation and solar hydrogen production from water, is introduced...
February 20, 2019: Advanced Materials
https://read.qxmd.com/read/30785214/recent-advances-in-carbon-based-metal-free-electrocatalysts
#11
REVIEW
Rajib Paul, Lin Zhu, Hao Chen, Jia Qu, Liming Dai
Precious noble metals (such as Pt, Ir) and nonprecious transition metals (e.g., Fe, Co), including their compounds (e.g., oxides, nitrides), have been widely investigated as efficient catalysts for energy conversion, energy storage, important chemical productions, and many industrial processes. However, they often suffer from high cost, low selectivity, poor durability, and susceptibility to gas poisoning with adverse environmental issues. As a low-cost alternative, the first carbon-based metal-free catalyst (C-MFC based on N-doped carbon nanotubes) was discovered in 2009...
February 20, 2019: Advanced Materials
https://read.qxmd.com/read/30779391/achieving-over-15-efficiency-in-organic-photovoltaic-cells-via-copolymer-design
#12
Yong Cui, Huifeng Yao, Ling Hong, Tao Zhang, Ye Xu, Kaihu Xian, Bowei Gao, Jinzhao Qin, Jianqi Zhang, Zhixiang Wei, Jianhui Hou
Ternary blending and copolymerization strategies have proven advantageous in boosting the photovoltaic performance of organic solar cells. Here, 15% efficiency solar cells using copolymerization donors are demonstrated, where the electron-withdrawing unit, ester-substituted thiophene, is incorporated into a PBDB-TF polymer to downshift the molecular energy and broaden the absorption. Copolymer-based solar cells suitable for large-area devices can be fabricated by a blade-coating method from a nonhalogen and nonaromatic solvent mixture...
February 19, 2019: Advanced Materials
https://read.qxmd.com/read/30779385/bottom-up-grown-2d-insb-nanostructures
#13
Sasa Gazibegovic, Ghada Badawy, Thijs L J Buckers, Philipp Leubner, Jie Shen, Folkert K de Vries, Sebastian Koelling, Leo P Kouwenhoven, Marcel A Verheijen, Erik P A M Bakkers
Low-dimensional high-quality InSb materials are promising candidates for next-generation quantum devices due to the high carrier mobility, low effective mass, and large g-factor of the heavy element compound InSb. Various quantum phenomena are demonstrated in InSb 2D electron gases and nanowires. A combination of the best features of these two systems (pristine nanoscale and flexible design) is desirable to realize, e.g., the multiterminal topological Josephson device. Here, controlled growth of 2D nanostructures, nanoflakes, on an InSb platform is demonstrated...
February 19, 2019: Advanced Materials
https://read.qxmd.com/read/30779384/pgm-free-cathode-catalysts-for-pem-fuel-cells-a-mini-review-on-stability-challenges
#14
REVIEW
Yuyan Shao, Jean-Pol Dodelet, Gang Wu, Piotr Zelenay
In recent years, significant progress has been achieved in the development of platinum group metal-free (PGM-free) oxygen reduction reaction (ORR) catalysts for proton exchange membrane (PEM) fuel cells. At the same time the limited durability of these catalysts remains a great challenge that needs to be addressed. This mini-review summarizes the recent progress in understanding the main causes of instability of PGM-free ORR catalysts in acidic environments, focusing on transition metal/nitrogen codoped systems (M-N-C catalysts, M: Fe, Co, Mn), particularly MNx moiety active sites...
February 19, 2019: Advanced Materials
https://read.qxmd.com/read/30773753/plasmon-enhanced-photoelectrochemical-water-splitting-for-efficient-renewable-energy-storage
#15
REVIEW
Luca Mascaretti, Aveek Dutta, Štěpán Kment, Vladimir M Shalaev, Alexandra Boltasseva, Radek Zbořil, Alberto Naldoni
Photoelectrochemical (PEC) water splitting is a promising approach for producing hydrogen without greenhouse gas emissions. Despite decades of unceasing efforts, the efficiency of PEC devices based on earth-abundant semiconductors is still limited by their low light absorption, low charge mobility, high charge-carrier recombination, and reduced diffusion length. Plasmonics has recently emerged as an effective approach for overcoming these limitations, although a full understanding of the involved physical mechanisms remains elusive...
February 18, 2019: Advanced Materials
https://read.qxmd.com/read/30773752/exploring-approaches-for-the-synthesis-of-few-layered-graphdiyne
#16
REVIEW
Jingyuan Zhou, Jiaqiang Li, Zhongfan Liu, Jin Zhang
Graphdiyne (GDY) is an emerging carbon allotrope in the graphyne (GY) family, demonstrating extensive potential applications in the fields of electronic devices, catalysis, electrochemical energy storage, and nonlinear optics. Synthesis of few-layered GDY is especially important for both electronic applications and structural characterization. This work critically summarizes the state-of-art of GDY and focuses on exploring approaches for few-layered GDY synthesis. The obstacles and challenges of GDY synthesis are also analyzed in detail...
February 18, 2019: Advanced Materials
https://read.qxmd.com/read/30773750/lead-halide-post-perovskite-type-chains-for-high-efficiency-white-light-emission
#17
Romain Gautier, Florian Massuyeau, Gabin Galnon, Michael Paris
Hybrid metal halides containing perovskite layers have recently shown great potential for applications in solar cells and light-emitting diodes. Such compounds exhibit quantum confinement effects leading to tunable optical and electronic properties. Thus, broadband white-light emission has been observed from diverse metal halides and, owing to high color rendering index, high thermal stability, and low-temperature solution processability, these materials have attracted interest for application in solid-state lighting...
February 18, 2019: Advanced Materials
https://read.qxmd.com/read/30773742/-57-fe-m%C3%A3-ssbauer-spectroscopy-characterization-of-electrocatalysts
#18
REVIEW
Ulrike I Kramm, Lingmei Ni, Stephan Wagner
This work addresses the importance of Mössbauer spectroscopy for the characterization of iron-containing electrocatalysts. The most important aspects of electrocatalysis and Mössbauer spectroscopy are summarized. Next, Fe-N-C catalysts and important conclusions made by this technique on preparation, active site identification and degradation are summarized. Furthermore, recent highlights derived for other iron-containing electrocatalysts are summarized.
February 18, 2019: Advanced Materials
https://read.qxmd.com/read/30773741/enhancing-electrocatalytic-water-splitting-by-strain-engineering
#19
REVIEW
Bo You, Michael T Tang, Charlie Tsai, Frank Abild-Pedersen, Xiaolin Zheng, Hong Li
Electrochemical water splitting driven by sustainable energy such as solar, wind, and tide is attracting ever-increasing attention for sustainable production of clean hydrogen fuel from water. Leveraging these advances requires efficient and earth-abundant electrocatalysts to accelerate the kinetically sluggish hydrogen and oxygen evolution reactions (HER and OER). A large number of advanced water-splitting electrocatalysts have been developed through recent understanding of the electrochemical nature and engineering approaches...
February 18, 2019: Advanced Materials
https://read.qxmd.com/read/30773721/progress-and-prospects-of-graphdiyne-based-materials-in-biomedical-applications
#20
REVIEW
Jiaming Liu, Chunying Chen, Yuliang Zhao
Graphdiyne is a new member of the family of carbon-based nanomaterials that possess two types of carbon atoms, sp- and sp2 -hybridized carbon atoms. As a novel 2D carbon-based nanomaterial with unique planar structure, such as uniformly distributed nanopores and large conjugated structure, graphdiyne has shown many fascinating properties in mechanics, electronics, and optics since it was first experimentally synthesized in 2010. Up to now, graphdiyne and its derivatives have been reported to be successfully applied in many areas, such as catalysis, energy, environment, and biomedicine, due to these excellent properties...
February 18, 2019: Advanced Materials
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