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https://www.readbyqxmd.com/read/28544652/brownmillerite-type-ca2fecoo5-as-a-practicable-oxygen-evolution-reaction-catalyst
#1
Etsushi Tsuji, Teruki Motohashi, Hiroyuki Noda, Damian Kowalski, Yoshitaka Aoki, Hajime Tanida, Junji Niikura, Yukinori Koyama, Masahiro Mori, Hajime Arai, Tsutomu Ioroi, Naoko Fujiwara, Yoshiharu Uchimoto, Zempachi Ogumi, Hiroki Habazaki
Here, we report remarkable oxygen evolution reaction (OER) catalytic activity of brownmillerite (BM)-type Ca2FeCoO5. The OER activity of this oxide is comparable to or beyond those of the state-of-the-art perovskite (PV)-catalyst Ba0.5Sr0.5Co0.8Fe0.2O3-δ (BSCF) and a precious-metal catalyst RuO2, emphasizing the importance of the characteristic BM structure with multiple coordination environments of transition metal (TM) species. Also, Ca2FeCoO5 is obviously advantageous in terms of expense/laboriousness of the material synthesis...
May 25, 2017: ChemSusChem
https://www.readbyqxmd.com/read/28544598/from-extended-nano-fluidics-to-an-autonomous-solar-light-driven-micro-fuel-cell-device
#2
Yuriy Pihosh, Jin Uemura, Ivan Turkevych, Kazuma Mawatari, Yutaka Kazoe, Adelina Smirnova, Takehiko Kitamori
Autonomous micro/nano mechanical, chemical and biomedical sensors require persistent power sources scaled to their size. Realization of autonomous micro-power sources is a challenging task, as it requires combination of wireless energy supply, conversion, storage and delivery to the sensor. In this work, we realized solar light driven power source that consists of a micro fuel cell (μFC) and a photocatalytic micro fuel generator (μFG) integrated on a single microfluidic chip. The μFG produces hydrogen by photocatalytic water splitting under solar light...
May 23, 2017: Angewandte Chemie
https://www.readbyqxmd.com/read/28544453/black-tungsten-nitride-as-metallic-photocatalyst-for-overall-water-splitting-operable-at-up-to-765-nm
#3
Yu Lei Wang, Ting Nie, Yu Hang Li, Xue Lu Wang, Li Rong Zheng, Ai Ping Chen, Xue Qing Gong, Huagui Yang
Semiconductor photocatalysts are hardly to be employed for overall water splitting beyond 700 nm, owing to both thermodynamic aspects and activation barriers. Metallic materials as photocatalysts are known to overcome this limitation through interband transitions for creating electron-hole pairs, however, the application of metallic photocatalysts for overall water splitting has never been fulfilled. Here we report, for the first time, that the black tungsten nitride can be employed as metallic photocatalyst for overall water splitting at wavelengths of up to 765 nm...
May 19, 2017: Angewandte Chemie
https://www.readbyqxmd.com/read/28544425/free-standing-holey-ni-oh-2-nanosheets-with-enhanced-activity-for-water-oxidation
#4
Xiangkai Kong, Changlin Zhang, Sang Youp Hwang, Qianwang Chen, Zhenmeng Peng
Electrochemical water oxidation is the key technology in water-splitting reactions and rechargeable metal-air batteries, which is very attractive for renewable energy conversion and storage. Replacement of precious catalysts with cost-effective and highly active alternatives is still a great challenge. Herein, based on theoretical predictions, holey structures are designed and fabricated on the free-standing conventional 2D OER catalyst. By well-controlled defects engineering, uniform tiny holes are created on the free-standing Ni(OH)2 nanosheets via a sol-gel method, with the embedded Zn components as the template for holes production...
May 19, 2017: Small
https://www.readbyqxmd.com/read/28544112/a-cost-efficient-bifunctional-ultrathin-nanosheets-array-for-electrochemical-overall-water-splitting
#5
Ying Zhang, Qi Shao, Yecan Pi, Jun Guo, Xiaoqing Huang
The design of cost-efficient earth-abundant catalysts with superior performance for the electrochemical water splitting is highly desirable. Herein, a general strategy for fabricating superior bifunctional water splitting electrodes is reported, where cost-efficient earth-abundant ultrathin Ni-based nanosheets arrays are directly grown on nickel foam (NF). The newly created Ni-based nanosheets@NF exhibit unique features of ultrathin building block, 3D hierarchical structure, and alloy effect with the optimized Ni5 Fe layered double hydroxide@NF (Ni5 Fe LDH@NF) exhibiting low overpotentials of 210 and 133 mV toward both oxygen evolution reaction and hydrogen evolution reaction at 10 mA cm(-2) in alkaline condition, respectively...
May 23, 2017: Small
https://www.readbyqxmd.com/read/28541559/hydraulic-redistribution-under-moderate-drought-among-english-oak-european-beech-and-norway-spruce-determined-by-deuterium-isotope-labeling-in-a-split-root-experiment
#6
Benjamin D Hafner, Martina Tomasella, Karl-Heinz Häberle, Marc Goebel, Rainer Matyssek, Thorsten E E Grams
Hydraulic redistribution (HR) of soil water through plant roots is a crucial phenomenon improving the water balance of plants and ecosystems. It is mostly described under severe drought, and not yet studied under moderate drought. We tested the potential of HR under moderate drought, hypothesizing that (H1) tree species redistribute soil water in their roots even under moderate drought and that (H2) neighboring plants are supported with water provided by redistributing plants. Trees were planted in split-root systems with one individual (i...
May 24, 2017: Tree Physiology
https://www.readbyqxmd.com/read/28537615/constructing-three-dimensional-porous-ni-ni3s2-nano-interfaces-for-hydrogen-evolution-electrocatalysis-under-alkaline-conditions
#7
Yiming An, Bolong Huang, Zilong Wang, Xia Long, Yongcai Qiu, Jue Hu, Dan Zhou, He Lin, Shihe Yang
It is still a challenging issue to design earth-abundant electrocatalysts with low cost, high activity and long-term stability for the hydrogen evolution reaction (HER) based on water splitting in alkaline solutions. Here, we report a facile synthetic route for a three-dimensional, porous Ni/Ni3S2 nano-network on carbon cloth for the efficient catalysis of HER. This unique structure exposes a high proportion of Ni/Ni3S2 hetero-interfaces to the electrolyte, creating a synergetic effect between Ni and Ni3S2 that enhances HER...
May 24, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/28535047/electronic-and-morphological-dual-modulation-of-cobalt-carbonate-hydroxides-by-mn-doping-towards-highly-efficient-and-stable-bifunctional-electrocatalysts-for-overall-water-splitting
#8
Tang Tang, Wen-Jie Jiang, Shuai Niu, Ning Liu, Hao Luo, Yu-Yun Chen, Shi-Feng Jin, Feng Gao, Li-Jun Wan, Jin-Song Hu
Developing bifunctional non-noble electrocatalysts for efficient and durable oxygen evolution reaction (OER) and hydrogen evolution reaction (HER) is highly desirable and challenging for overall water splitting. Herein, Co-Mn carbonate hydroxide (CoMnCH) nanosheet arrays with controllable morphology and composition were developed on nickel foam (NF) as such bifunctional electrocatalysts. It was discovered that Mn doping in CoCH can simultaneously modulate the nanosheet morphology to significantly increase the electrochemical active surface area for exposing more accessible active sites and tune the electronic structure of Co center to effectively boost its intrinsic activity...
May 23, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/28534585/development-of-ir-and-la-codoped-bata2o6-photocatalysts-using-visible-light-up-to-640-nm-as-an-h2-evolving-photocatalyst-for-z-schematic-water-splitting
#9
Akihide Iwase, Akihiko Kudo
Ir and La-codoped BaTa2O6 was developed as a novel photocatalyst for H2 evolution utilizing visible light up to 640 nm. The Ir and La-codoped BaTa2O6 with a Ru cocatalyst functioned as an H2-evolving photocatalyst for Z-schematic water splitting under visible light irradiation upon combination with a BiVO4 O2-evolving photocatalyst and a [Co(bpy)3](3+/2+) electron mediator.
May 23, 2017: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/28531092/effective-silicon-nanowire-arrays-wo3-core-shell-photoelectrode-for-neutral-ph-water-splitting
#10
Zhen Chen, Ning Minghui, Ge Ma, Qingguo Meng, Yongguang Zhang, Jinwei Gao, Mingliang Jin, Zhihong Chen, Mingzhe Yuan, Xin Wang, Junming Liu, Guofu Zhou
We report the first demonstration of a high-efficiency photoelectrochemical (PEC) water splitting reaction using a novel Si NWs/WO3 core/shell photoanode prepared by a mild and inexpensive metal-catalyzed electroless etching (MCEE) process followed by dip-coating, airing and annealing methods. The dense and vertically aligned Si NWs/WO3 core/shell nanostructure were characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), and X-ray diffraction (XRD). In comparison to planar n-Si, Si NWs and planar Si/WO3, the Si NWs/WO3 samples showed significantly enhanced photocurrent over the entire potential sweep range...
May 22, 2017: Nanotechnology
https://www.readbyqxmd.com/read/28530789/insight-into-charge-separation-in-wo3-bivo4-heterojunction-for-solar-water-splitting
#11
Sang Youn Chae, Chang Soo Lee, Hyejin Jung, Oh-Shim Joo, Byoung Koun Min, Jong Hak Kim, Yun Jeong Hwang
The WO3/BiVO4 heterojunction has shown promising photoelectrochemical (PEC) water splitting activity based on its charge transfer and light absorption capability, and notable enhancement of the photocurrent has been achieved via morphological modification of WO3. We developed a graft copolymer-assisted protocol for the synthesis of WO3 mesoporous thin films on a transparent conducting electrode, wherein the particle size, particle shape, and thickness of the WO3 layer were controlled by tuning the interactions in the polymer/sol-gel hybrid...
May 22, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28530305/ultrathin-coox-modified-hematite-with-low-onset-potential-for-solar-water-oxidation
#12
Chun Du, Jun Wang, Xiao Liu, Jie Yang, Kun Cao, Yanwei Wen, Rong Chen, Bin Shan
Photoelectrochemical water splitting holds great potential for solar energy conversion and storage with zero greenhouse gas emission. Integration of a suitable co-catalyst with an absorber material enables the realization of highly efficient photocleavage of water. Herein, nanostructured hematite film was coated with an ultrathin and conformal CoOx overlayer through atomic layer deposition (ALD). The best performing hybrid hematite with a 2-3 nm ALD CoOx overlayer yielded a remarkable turn on potential of 0...
May 22, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28525707/self-organized-growth-of-two-dimensional-gate-nanosheet-on-zno-nanowires-for-heterojunctional-water-splitting-applications
#13
Qiuguo Li, Xinzhou Ma, Huiqiang Liu, Zuxin Chen, Hao Chen, Sheng Chu
Epitaxial two-demensional GaTe nanosheets on ZnO nanowires were routinely prepared via a two-step chemical vapour deposition procedure. The epitaxial relationship and growth mechanism of the GaTe/ZnO core/shell structures were explored and attributed to a layer-over-layer model. The hybrid structures increased the surface area and the favorable p-n heterojunction enhanced the charge separation for photoelectrochemical performance in water splitting. The above synergistic effects boosted the photocurrent density from -0...
May 19, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28523861/a-bifunctional-hybrid-electrocatalyst-for-oxygen-reduction-and-evolution-cobalt-oxide-nanoparticles-strongly-coupled-to-b-n-decorated-graphene
#14
Yun Tong, Pengzuo Chen, Tianpei Zhou, Kun Xu, Wangsheng Chu, Changzheng Wu, Yi Xie
The electrocatalyzed oxygen reduction and evolution reactions (ORR and OER, respectively) are the core components of many energy conversion systems, including water splitting, fuel cells, and metal-air batteries. Rational design of highly efficient non-noble materials as bifunctional ORR/OER electrocatalysts is of great importance for large-scale practical applications. A new strongly coupled hybrid material is presented, which comprises CoOx nanoparticles rich in oxygen vacancies grown on B,N-decorated graphene (CoOx NPs/BNG) and operates as an efficient bifunctional OER/ORR electrocatalyst...
May 19, 2017: Angewandte Chemie
https://www.readbyqxmd.com/read/28522461/solar-thermochemical-splitting-of-water-to-generate-hydrogen
#15
C N R Rao, Sunita Dey
Solar photochemical means of splitting water (artificial photosynthesis) to generate hydrogen is emerging as a viable process. The solar thermochemical route also promises to be an attractive means of achieving this objective. In this paper we present different types of thermochemical cycles that one can use for the purpose. These include the low-temperature multistep process as well as the high-temperature two-step process. It is noteworthy that the multistep process based on the Mn(II)/Mn(III) oxide system can be carried out at 700 °C or 750 °C...
May 18, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/28516994/3d-ordered-porous-moxc-x-1-or-2-for-advanced-hydrogen-evolution-and-li-storage
#16
Hong Yu, Haosen Fan, Jiong Wang, Yun Zheng, Zhengfei Dai, Yizhong Lu, Junhua Kong, Xin Wang, Young Jin Kim, Qingyu Yan, Jong-Min Lee
3D ordered porous structures of MoxC are prepared with different Mo to C ratios and tested for two possible promising applications: hydrogen evolution reaction (HER) through water splitting and lithium ion batteries (LIBs). Mo2C and MoC with 3D periodic ordered structures are prepared with a similar process but different precursors. The 3D ordered porous MoC exhibits excellent cycling stability and rate performance as an anode material for LIBs. A discharge capacity of 450.9 mA h g(-1) is maintained up to 3000 cycles at 10...
May 18, 2017: Nanoscale
https://www.readbyqxmd.com/read/28516511/electrochemically-treated-bivo4-photoanode-for-efficient-photoelectrochemical-water-splitting
#17
Lianzhou Wang
BiVO4 films with (040) facet grown vertically on fluorine doped SnO2 (FTO) glass substrates are prepared by a seed-assisted hydrothermal method. A simple electrochemical treatment process drastically enhances the photocatalytic activity of BiVO4, exhibiting a remarkable photocurrent density of 2.5 mA cm-2 at 1.23 V vs. reversible hydrogen electrode (RHE) under AM 1.5 G illumination, which is approximately 10 folds higher than that of the pristine one. Loading cobalt borate (CoBi) as cocatalyst, the photocurrent density of the BiVO4 photoanode can be further improved to 3...
May 17, 2017: Angewandte Chemie
https://www.readbyqxmd.com/read/28514528/overcoming-the-instability-of-nanoparticle-based-catalyst-films-in-alkaline-electrolysers-by-self-assembling-and-self-healing-films
#18
Stefan Barwe, Justus Masa, Corina Andronescu, Bastian Mei, Wolfgang Schuhmann, Edgar Ventosa
Engineering stable electrodes using highly active catalyst nanopowders for electrochemical water splitting remains a notorious challenge. We report an innovative and general approach for attaining highly stable catalyst films with self-healing capability based on in-situ self-assembly of catalyst particles during electrolysis. The catalyst particles are added to the electrolyte forming a suspension that is pumped through the electrolyzer. Particles with negatively charged surfaces stick onto the anode, while particles with positively charged surfaces stick to the cathode...
May 17, 2017: Angewandte Chemie
https://www.readbyqxmd.com/read/28513886/regulating-water-reduction-kinetics-in-cobalt-phosphide-for-enhancing-her-catalytic-activity-in-alkaline-solution
#19
Kun Xu, Hui Ding, Mengxing Zhang, Min Chen, Zikai Hao, Lidong Zhang, Changzheng Wu, Yi Xie
Electrochemical water splitting to produce hydrogen renders a promising pathway for renewable energy storage. Considering limited electrocatalysts have good oxygen-evolution reaction (OER) catalytic activity in acid solution while numerous economical materials show excellent OER catalytic performance in alkaline solution, developing new strategies that enhance the alkaline hydrogen-evolution reaction (HER) catalytic activity of cost-effective catalysts is highly desirable for achieving highly efficient overall water splitting...
May 17, 2017: Advanced Materials
https://www.readbyqxmd.com/read/28513669/the-open-cubane-oxo-oxyl-coupling-mechanism-dominates-photosynthetic-oxygen-evolution-a-comprehensive-dft-investigation-on-o-o-bond-formation-in-the-s4-state
#20
Yu Guo, Hui Li, Lan-Lan He, Dong-Xia Zhao, Li-Dong Gong, Zhong-Zhi Yang
The dioxygen formation mechanism of biological water oxidation in nature has long been the focus of argument; many diverse mechanistic hypotheses have been proposed. Based on a recent breakthrough in the resolution of the electronic and structural properties of the oxygen-evolving complex in the S3 state, our density functional theory (DFT) calculations reveal that the open-cubane oxo-oxyl coupling mechanism, whose substrates preferably originate from W2 and O5 in the S2 state, emerges as the best candidate for O-O bond formation in the S4 state...
May 17, 2017: Physical Chemistry Chemical Physics: PCCP
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