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Oxygen evolution nano

Xijun Liu, Haoxuan Liu, Xianyun Peng, Gaocan Qi, Jun Luo
Development of highly active and stable electrocatalysts for overall water splitting is important for future renewable energy systems. Herein, we designedly fabricated porous Mn-doped FeP/Co3(PO4)2 (PMFCP) nanosheets on carbon cloth, which can be utilized as a highly efficient 3D self-supported binder-free integrated electrode for the oxygen- and hydrogen- evolution reactions (OER and HER) in a wide pH range. Specifically, overpotentials of 27, 117, 85 mV are required for the PMFCP nanosheets to arrive 10 mA cm-2 for HER in 0...
January 22, 2019: ChemSusChem
Wolfgang Junge
Cyanobacteria and plants carry out oxygenic photosynthesis. They use water to generate the atmospheric oxygen we breathe and carbon dioxide to produce the biomass serving as food, feed, fibre and fuel. This paper scans the emergence of structural and mechanistic understanding of oxygen evolution over the past 50 years. It reviews speculative concepts and the stepped insight provided by novel experimental and theoretical techniques. Driven by sunlight photosystem II oxidizes the catalyst of water oxidation, a hetero-metallic Mn4CaO5(H2O)4 cluster...
January 2019: Quarterly Reviews of Biophysics
Zhipeng Lin, Hao Zhang, Guofeng Liang, Yanqi Jin, Hongbin Zeng, Jiawang Li, Jian Chen, Weihong Zhang, Fangyan Xie, Yanshuo Jin, Hui Meng
FeOOH nano cubes anchored on carbon ribbons are synthesized and used as cathode material for Li/O2 battery. Iron exchanged resin works as precursor for both FeOOH nano cubes and carbon ribbons. FeOOH and carbon ribbon are formed simultaneously. The as prepared FeOOH cubes are proposed to have a core-shell structure with FeOOH as shell and Prussian Blue as core based on the information of XPS, TEM and EDS mapping. As cathode material for the Li/O2 battery, FeOOH deliveres a specific capacity of 14816 mAh g-1cathode and cycling stability of 67 cycles over 400 hours...
January 8, 2019: Chemistry: a European Journal
Ke Fan, Haiyuan Zou, Yue Lu, Hong Chen, Fusheng Li, Jinxuan Liu, Licheng Sun, Lianpeng Tong, Michael F Toney, Manling Sui, Jiaguo Yu
As one of the most remarkable oxygen evolution reaction (OER) electrocatalysts, metal chalcogenides have been intensively reported due to their high OER activities during the past few decades. It has been reported that electron-chemical conversion of metal chalcogenides into oxides/hydroxides would take place after OER. However, the transition mechanism of such unstable structures, as well as the real active sites and catalytic activity during OER for these electrocatalysts, has not been understood yet, which urgently needs a direct observation for the electrocatalytic water oxidation process, especially at nano or even angstrom scale...
December 3, 2018: ACS Nano
Bo Zhang, Min Chen, Changbin Zhang, Hong He
An all-solid cell with a solid polymer electrolyte was applied to electrochemical oxidation of low-concentration indoor gaseous aromatic pollution. Antimony-doped tin dioxide nanocoatings deposited on a titanium foam substrate (Ti/Sb-SnO2 ) with different Sb/Sn ratios (4.8-14.0 mol%) and loading weight of Sb-SnO2 (4.4-7.7 mg cm- 2 ) were used as dimensionally stable anodes. Sn and Sb were homogeneously dispersed on the substrate, and a crack-free nanocoating was built when the loading of nanocoating was increased to 6...
November 10, 2018: Chemosphere
Davide Barreca, Filippo Gri, Alberto Gasparotto, Thomas Altantzis, Valentina Gombac, Paolo Fornasiero, Chiara Maccato
Among transition metal oxides, MnO2 is of considerable importance for various technological end-uses, from heterogeneous catalysis to gas sensing, owing to its structural flexibility and unique properties at the nanoscale. In this work, we demonstrate the successful fabrication of supported MnO2 nanomaterials by a catalyst-free, plasma-assisted process starting from a fluorinated manganese(II) molecular source in Ar/O2 plasmas. A thorough multitechnique characterization aimed at the systematic investigation of material structure, chemical composition, and morphology revealed the formation of F-doped, oxygen-deficient, MnO2 -based nanomaterials, with a fluorine content tunable as a function of growth temperature ( TG )...
November 8, 2018: Inorganic Chemistry
Lipei Qin, Guojing Wang, Yiwei Tan
Visible light-driven water splitting (VLWS) into hydrogen and oxygen is attractive and depends on efficient photocatalysts. Herein, we demonstrate the first exploration of the capability to control the morphology of nanostructured TiO2 in conjunction with the choice of a suitable plasmonic metal (PM) to fabricate novel photocatalysts that are capable of harvesting visible light for more efficient VL-fuel conversion. This methodology affords us to successful access to the novel plasmonic Pt/TiO2 -HA (large Pt nanoparticles (NPs) supported on TiO2 hierarchical nano-architecture (TiO2 -HA)) photocatalysts that exhibit plasmon absorption in the visible range and consequent outstanding activity and durability for VLWS...
November 1, 2018: Scientific Reports
Xiaoxu Liu, Yanhui Wang, Libei Chen, Peipei Chen, Shaopei Jia, Yan Zhang, Shuyu Zhou, Jianbing Zang
A novel hybrid electrocatalyst of Co2 B and Co nanoparticles immobilized on N-B-doped carbon derived from nano-B4 C (Co2 B/Co/N-B-C/B4 C) is in situ synthesized by pyrolysis of nano-B4 C supporting Co(OH)2 nanoparticles with melamine. The Co2 B and Co nanoparticles are formed and anchored on the generated N and B codoped carbon and undecomposed B4 C. The hybrid exhibits remarkable catalytic performances toward the oxygen evolution reaction (OER) and oxygen reduction reaction (ORR)-a very small potential of 1...
October 31, 2018: ACS Applied Materials & Interfaces
Mohammad Fathi Tovini, Bhushan Patil, Cevriye Koz, Tamer Uyar, Eda Yılmaz
A 3D RuO2 /Mn2 O3 /carbon nanofiber (CNF) composite has been prepared in this study by a facile two step microwave synthesis, as a bi-functional electrocatalyst towards oxygen reduction reaction (ORR) and oxygen evolution reaction (OER). RuO2 nanoparticles with the mean size of 1.57 nm are uniformly distributed on Mn2 O3 nano-rods grown on electrospun CNFs. The electrocatalytic activity of the composites are investigated towards ORR/OER under alkaline condition. The ternary RuO2 /Mn2 O3 /CNF composite showed superior ORR activity in terms of onset potential (0...
November 23, 2018: Nanotechnology
Guruprakash Karkera, Shivaraju Guddehalli Chandrappa, Annigere S Prakash
With an anticipation of their use in electric vehicles, Li-O2 batteries are found to be attractive despite their complex chemistry and drawbacks. To be successful, cathode materials that are robust enough to overcome the sluggish kinetics of the charge-discharge reactions are essential. This work reports sonochemically synthesized porous MnCo2 O4 /graphene (MCO/G) as a hybrid cathode material in nonaqueous Li-O2 batteries. The MCO/G hybrid is synthesized in less than four hours and offers a strong synergistic coupling between the MnCo2 O4 nanospheres and graphene sheets...
November 22, 2018: Chemistry: a European Journal
Arindam Indra, Taeseup Song, Ungyu Paik
Exploring new materials with high efficiency and durability is the major requirement in the field of sustainable energy conversion and storage systems. Numerous techniques have been developed in last three decades to enhance the efficiency of the catalyst systems, control over the composition, structure, surface area, pore size, and moreover morphology of the particles. In this respect, metal organic framework (MOF) derived catalysts are emerged as the finest materials with tunable properties and activities for the energy conversion and storage...
September 2018: Advanced Materials
Jianbo Zhang, Yang Ding, Cheng-Chien Chen, Zhonghou Cai, Jun Chang, Bijuan Chen, Xinguo Hong, Andrei Fluerasu, Yugang Zhang, Ching-Shun Ku, Dale Brewe, Steve Heald, Hirofumi Ishii, Nozomu Hiraoka, Ku-Ding Tsuei, Wenjun Liu, Zhan Zhang, Yong Q Cai, Genda Gu, Tetsuo Irifune, Ho-Kwang Mao
One challenge in studying high-temperature superconductivity (HTSC) stems from a lack of direct experimental evidence linking lattice inhomogeneity and superconductivity. Here, we apply synchrotron hard X-ray nanoimaging and small-angle scattering to reveal a novel micron-scaled ribbon phase in optimally doped Bi2 Sr2 CaCu2 O8+δ (Bi-2212, with δ = 0.1). The morphology of the ribbon-like phase evolves simultaneously with the dome-shaped TC behavior under pressure. X-ray absorption studies show that the increasing of TC is associated with oxygen-hole redistribution in the CuO2 plan, while TC starts to decrease with pressure when oxygen holes become immobile...
August 2, 2018: Journal of Physical Chemistry Letters
Bowei Zhang, Chaojiang Li, Guang Yang, Kang Huang, Junsheng Wu, Zhong Li, Xun Cao, Dongdong Peng, Shiji Hao, Yizhong Huang
Adoption of bare metal oxides as catalytic materials shows inferior electrochemical activity because of their poor electrical conductivity. Although synthetic strategies for the employment of conductive substrates are well-established, the rational design and fabrication of hollow metal oxides nanostructures on the robust matrix with a high surface area and conductivity remains challenging. In the present research work, a strategy that transforms a metal-organic framework thin layer into a nanostructured CuO/C hollow shell to coat on the 3D nano-dendritic Cu foams as an electrode was successfully developed...
July 18, 2018: ACS Applied Materials & Interfaces
Peng Luan, Ying Zhang, Xiaolong Zhang, Zhijun Li, Ragesh Prathapan, Udo Bach, Jie Zhang
In this study, we report a photoanode consisting of a polymeric/inorganic nanojunction between novel nanostructured 3D C3 N4 nano-networks and BiVO4 substrate. This nanojunction is formed such that 3D C3 N4 nano-networks with a positively charged surface are efficiently anchored on the BiVO4 photoanode with a negatively charged surface. This electrostatic self-assembly can initiate and contribute to an intimate contact at the interfaces, leading to an enhanced photoelectrochemical activity and stability compared with that fabricated by non-electrostatic assembly...
August 9, 2018: ChemSusChem
Srishti Mishra, Md Meraj, Snehanshu Pal
A large-scale molecular dynamics (MD) simulation of nano-indentation was carried out to provide insight into the influence of the Al-Al2 O3 interface on dislocation evolution and deformation behavior of Al substrate coated with Al2 O3 thin film. Adaptive common neighbor analysis (a-CNA), centro-symmetry parameter (CSP) estimation, and dislocation extraction algorithm (DXA) were implemented to represent structural evolution during nano-indentation deformation. The absence of elastic regime was observed in the P-h curve for this simulated nano-indentation test of Al2 O3 thin film coated Al specimen...
June 19, 2018: Journal of Molecular Modeling
P Lettenmeier, J Majchel, L Wang, V A Saveleva, S Zafeiratos, E R Savinova, J-J Gallet, F Bournel, A S Gago, K A Friedrich
A stable and cost effective oxygen evolution reaction (OER) catalyst is crucial for the large-scale market penetration of proton exchange membrane (PEM) water electrolyzers. We show that the synthesis of iridium nanoparticles in either low purity ethanol or water, or in the absence of a surfactant, is detrimental to the electrocatalytic properties of the materials. Adding NaBH4 in excess improves the purity of the catalyst enhancing the OER activity up to 100 A gIr -1 at 1.51 V vs. RHE, the highest value reported so far for high purity Ir nanoparticles...
April 14, 2018: Chemical Science
Chakadola Panda, Prashanth W Menezes, Matthias Driess
The low-temperature synthesis of inorganic materials and their interfaces at the atomic and molecular level provides numerous opportunities for the design and improvement of inorganic materials in heterogeneous catalysis for sustainable chemical energy conversion or other energy-saving areas. Using suitable molecular precursors for functional inorganic nanomaterial synthesis allows for facile control over uniform particle size distribution, stoichiometry, and leads to desired chemical and physical properties...
August 27, 2018: Angewandte Chemie
Xiao-Wen Cao, Qi-Dai Chen, Hua Fan, Lei Zhang, Saulius Juodkazis, Hong-Bo Sun
We report a systematical study on the liquid assisted femtosecond laser machining of quartz plate in water and under different etching solutions. The ablation features in liquid showed a better structuring quality and improved resolution with 1/3~1/2 smaller features as compared with those made in air. It has been demonstrated that laser induced periodic structures are present to a lesser extent when laser processed in water solutions. The redistribution of oxygen revealed a strong surface modification, which is related to the etching selectivity of laser irradiated regions...
April 28, 2018: Nanomaterials
Maciej Gryszel, Mykhailo Sytnyk, Marie Jakešová, Giuseppe Romanazzi, Roger Gabrielsson, Wolfgang Heiss, Eric Daniel Głowacki
Low-cost semiconductor photocatalysts offer unique possibilities for industrial chemical transformations and energy conversion applications. We report that a range of organic semiconductors are capable of efficient photocatalytic oxygen reduction to H2 O2 in aqueous conditions. These semiconductors, in the form of thin films, support a 2-electron/2-proton redox cycle involving photoreduction of dissolved O2 to H2 O2 , with the concurrent photooxidation of organic substrates: formate, oxalate, and phenol. Photochemical oxygen reduction is observed in a pH range from 2 to 12...
April 25, 2018: ACS Applied Materials & Interfaces
Yanmei Sun, Shiwei Wang, Junfeng Niu
Microbes play important roles during river remediation and the interaction mechanism illustration between microorganisms and sewage is of great significance to improve restoration technology. In this study, micro-nano bubble and submerged resin floating bed composite technology (MBSR) was firstly used to restore two black and stinking urban rivers. After restoration, the water pollution indices such as dissolved oxygen (DO), ammonia nitrogen (NH4 + -N), total phosphorous (TP), chemical oxygen demand (CODCr ), water clarity, and the number of facial coliform were significantly improved...
June 2018: Bioresource Technology
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