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Journal of Materials Chemistry. A, Materials for Energy and Sustainability

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https://www.readbyqxmd.com/read/30147937/greener-and-size-specific-synthesis-of-stable-fe-cu-oxides-as-earth-abundant-adsorbents-for-malachite-green
#1
Ping Zhang, Deyi Hou, Xuanru Li, Simo Pehkonen, Rajender S Varma, Xun Wang
A greener and sustainable pathway to the assembly of Fe, Cu -based adsorbent is described using Virginia creeper ( Parthenocissus quinquefolia ) leaf extracts in presence of oxalic acid which avoids the use of toxic chemicals. Characterization of the synthesized mixed Fe, Cu oxides are carried out by SEM, TEM, XRD, FT-IR, XPS, and BET techniques; SEM and TEM results disclosed particle size ranging from 160 nm to 1 μm in presence of varying oxalic acid amounts of 0 and 0.1 mol/L. The X-ray photoelectron spectroscopy studies revealed that the sample comprised of Fe, Cu-based hybrid oxides and oxalates...
May 16, 2018: Journal of Materials Chemistry. A, Materials for Energy and Sustainability
https://www.readbyqxmd.com/read/30009026/vacancy-defect-configurations-in-the-metal-organic-framework-uio-66-energetics-and-electronic-structure
#2
Katrine L Svane, Jessica K Bristow, Julian D Gale, Aron Walsh
Vacancy lattice sites in the metal-organic framework UiO-66 are known to have a profound effect on the material properties. Here we use density functional theory to compare the energies of defect arrangements containing missing linkers and missing metal clusters for different choices of charge compensation. Our results show that the preference for missing metal clusters or missing linker defects depends on the charge compensation as well as the overall concentration of defects in the crystal. Both regimes can be experimentally accessible depending on the synthesis conditions...
May 14, 2018: Journal of Materials Chemistry. A, Materials for Energy and Sustainability
https://www.readbyqxmd.com/read/30009025/the-effect-of-oxygen-on-the-efficiency-of-planar-p-i-n-metal-halide-perovskite-solar-cells-with-a-pedot-pss-hole-transport-layer
#3
Bardo J Bruijnaers, Eric Schiepers, Christ H L Weijtens, Stefan C J Meskers, Martijn M Wienk, René A J Janssen
Poly(3,4-ethylenedioxythiophene):polystyrene sulfonate (PEDOT:PSS) is frequently used as hole transport layer in planar p-i-n perovskite solar cells. Here we show that processing of a metal halide perovskite layer on top of PEDOT:PSS via spin coating of a precursor solution chemically reduces the oxidation state of PEDOT:PSS. This reduction leads to a lowering of the work function of the PEDOT:PSS and the perovskite layer on top of it. As a consequence, the solar cells display inferior performance with a reduced open-circuit voltage and a reduced short-circuit current density, which increases sublinearly with light intensity...
April 28, 2018: Journal of Materials Chemistry. A, Materials for Energy and Sustainability
https://www.readbyqxmd.com/read/30009024/computer-simulations-of-4240-mof-membranes-for-h-2-ch-4-separations-insights-into-structure-performance-relations
#4
Cigdem Altintas, Gokay Avci, Hilal Daglar, Ezgi Gulcay, Ilknur Erucar, Seda Keskin
Design of new membranes having high H2 /CH4 selectivity and high H2 permeability is strongly desired to reduce the energy demand for H2 production. Metal organic frameworks (MOFs) offer a great promise for membrane-based gas separations due to their tunable physical and chemical properties. We performed a high-throughput computational screening study to examine membrane-based H2 /CH4 separation potentials of 4240 MOFs. Grand canonical Monte Carlo (GCMC) and molecular dynamics (MD) simulations were used to compute adsorption and diffusion of H2 and CH4 in MOFs...
April 14, 2018: Journal of Materials Chemistry. A, Materials for Energy and Sustainability
https://www.readbyqxmd.com/read/30009023/a-full-monolayer-of-superoxide-oxygen-activation-on-the-unmodified-ca-3-ru-2-o-7-001-surface
#5
Daniel Halwidl, Wernfried Mayr-Schmölzer, Martin Setvin, David Fobes, Jin Peng, Zhiqiang Mao, Michael Schmid, Florian Mittendorfer, Josef Redinger, Ulrike Diebold
Activating the O2 molecule is at the heart of a variety of technological applications, most prominently in energy conversion schemes including solid oxide fuel cells, electrolysis, and catalysis. Perovskite oxides, both traditionally-used and novel formulations, are the prime candidates in established and emerging energy devices. This work shows that the as-cleaved and unmodified CaO-terminated (001) surface of Ca3 Ru2 O7 , a Ruddlesden-Popper perovskite, supports a full monolayer of superoxide ions, O2 - , when exposed to molecular O2 ...
April 14, 2018: Journal of Materials Chemistry. A, Materials for Energy and Sustainability
https://www.readbyqxmd.com/read/29682289/remarkable-impact-of-low-biybo-3-doping-levels-on-the-local-structure-and-phase-transitions-of-batio-3
#6
M Deluca, Z G Al-Jlaihawi, K Reichmann, A M T Bell, A Feteira
In situ Raman spectroscopy shows the simultaneous incorporation of small amounts of Bi3+ and Yb3+ into the lattice of BaTiO3 to break the average symmetry inferred from X-ray powder diffraction analysis and permittivity measurements. In particular, Bi3+ with a stereochemically active lone-pair of electrons induces severe lattice strain and the coexistence of different local crystal symmetries over a wide temperature range, effectively controlling the physical properties, such as the temperature dependence of the permittivity and the Curie temperature...
April 7, 2018: Journal of Materials Chemistry. A, Materials for Energy and Sustainability
https://www.readbyqxmd.com/read/29456857/platinum-free-graphene-based-anodes-and-air-cathodes-for-single-chamber-microbial-fuel-cells
#7
Toby P Call, Tian Carey, Paolo Bombelli, David J Lea-Smith, Philippa Hooper, Christopher J Howe, Felice Torrisi
Microbial fuel cells (MFCs) exploit the ability of microorganisms to generate electrical power during metabolism of substrates. However, the low efficiency of extracellular electron transfer from cells to the anode and the use of expensive rare metals as catalysts, such as platinum, limit their application and scalability. In this study we investigate the use of pristine graphene based electrodes at both the anode and the cathode of a MFC for efficient electrical energy production from the metabolically versatile bacterium Rhodopseudomonas palustris CGA009...
December 7, 2017: Journal of Materials Chemistry. A, Materials for Energy and Sustainability
https://www.readbyqxmd.com/read/29308202/poly-3-4-ethylenedioxythiophene-tosylate-pedot-tos-electrodes-in-thermogalvanic-cells
#8
Kosala Wijeratne, Mikhail Vagin, Robert Brooke, Xavier Crispin
The interest in thermogalvanic cells (TGCs) has grown because it is a candidate technology for harvesting electricity from natural and waste heat. However, the cost of TGCs has a major component due to the use of the platinum electrode. Here, we investigate new alternative electrode material based on conducting polymers, more especially poly(3,4-ethylenedioxythiophene)-tosylate (PEDOT-Tos) together with the ferro/ferricyanide redox electrolyte. The power generated by the PEDOT-Tos based TGCs increases with the conducting polymer thickness/multilayer and reaches values similar to the flat platinum electrode based TGCs...
October 7, 2017: Journal of Materials Chemistry. A, Materials for Energy and Sustainability
https://www.readbyqxmd.com/read/29785268/impact-of-fullerene-derivative-isomeric-purity-on-the-performance-of-inverted-planar-perovskite-solar-cells
#9
Edison Castro, Gerardo Zavala, Sairaman Seetharaman, Francis D'Souza, Luis Echegoyen
The effect of utilizing a pure cis -α-dimethoxy carbonyl fulleropyrrolidine C70 (DMEC70 ) isomer as the electron transporting material (ETM) in inverted perovskite solar cells (PSCs) was evaluated. The as-prepared C70 mono-adduct products are mixtures of regioisomers and the interest was to evaluate them independently as ETMs. Three different cis -DMEC70 isomers (α, β- endo and β- exo ) (mix-DMEC70 ) were synthesized and purified by HPLC. It was found that PSCs based on the pure α-DMEC70 exhibit a substantially enhanced maximum power conversion efficiency (PCE) of 18...
September 28, 2017: Journal of Materials Chemistry. A, Materials for Energy and Sustainability
https://www.readbyqxmd.com/read/29062483/a-highly-stretchable-and-robust-non-fluorinated-superhydrophobic-surface
#10
Jie Ju, Xi Yao, Xu Hou, Qihan Liu, Yu Shrike Zhang, Ali Khademhosseini
Superhydrophobic surface simultaneously possessing exceptional stretchability, robustness, and non-fluorination is highly desirable in applications ranging from wearable devices to artificial skins. While conventional superhydrophobic surfaces typically feature stretchability, robustness, or non-fluorination individually, co-existence of all these features still remains a great challenge. Here we report a multi-performance superhydrophobic surface achieved through incorporating hydrophilic micro-sized particles with pre-stretched silicone elastomer...
August 21, 2017: Journal of Materials Chemistry. A, Materials for Energy and Sustainability
https://www.readbyqxmd.com/read/29456856/design-principles-of-perovskites-for-solar-driven-thermochemical-splitting-of-co-2
#11
Miriam Ezbiri, Michael Takacs, Boris Stolz, Jeffrey Lungthok, Aldo Steinfeld, Ronald Michalsky
Perovskites are attractive redox materials for thermo/electrochemical fuel synthesis. To design perovskites with balanced redox energetics for thermochemically splitting CO2 , the activity of lattice oxygen vacancies and stability against crystal phase changes and detrimental carbonate formation are predicted for a representative range of perovskites by electronic structure computations. Systematic trends in these materials properties when doping with selected metal cations are described in the free energy range defined for isothermal and temperature-swing redox cycles...
August 7, 2017: Journal of Materials Chemistry. A, Materials for Energy and Sustainability
https://www.readbyqxmd.com/read/29308201/the-effect-of-side-chain-substitution-and-hot-processing-on-diketopyrrolopyrrole-based-polymers-for-organic-solar-cells
#12
Gaël H L Heintges, Pieter J Leenaers, René A J Janssen
The effects of cold and hot processing on the performance of polymer-fullerene solar cells are investigated for diketopyrrolopyrrole (DPP) based polymers that were specifically designed and synthesized to exhibit a strong temperature-dependent aggregation in solution. The polymers, consisting of alternating DPP and oligothiophene units, are substituted with linear and second position branched alkyl side chains. For the polymer-fullerene blends that can be processed at room temperature, hot processing does not enhance the power conversion efficiencies compared to cold processing because the increased solubility at elevated temperatures results in the formation of wider polymer fibres that reduce charge generation...
July 14, 2017: Journal of Materials Chemistry. A, Materials for Energy and Sustainability
https://www.readbyqxmd.com/read/28580142/enhanced-pyroelectric-and-piezoelectric-properties-of-pzt-with-aligned-porosity-for-energy-harvesting-applications
#13
Yan Zhang, Mengying Xie, James Roscow, Yinxiang Bao, Kechao Zhou, Dou Zhang, Chris R Bowen
This paper demonstrates the significant benefits of exploiting highly aligned porosity in piezoelectric and pyroelectric materials for improved energy harvesting performance. Porous lead zirconate (PZT) ceramics with aligned pore channels and varying fractions of porosity were manufactured in a water-based suspension using freeze-casting. The aligned porous PZT ceramics were characterized in detail for both piezoelectric and pyroelectric properties and their energy harvesting performance figures of merit were assessed parallel and perpendicular to the freezing direction...
April 14, 2017: Journal of Materials Chemistry. A, Materials for Energy and Sustainability
https://www.readbyqxmd.com/read/28580144/oxygen-induced-doping-on-reduced-pedot
#14
E Mitraka, M J Jafari, M Vagin, X Liu, M Fahlman, T Ederth, M Berggren, M P Jonsson, X Crispin
The conducting polymer poly(3,4-ethylenedioxythiophene) (PEDOT) has shown promise as air electrode in renewable energy technologies like metal-air batteries and fuel cells. PEDOT is based on atomic elements of high abundance and is synthesized at low temperature from solution. The mechanism of oxygen reduction reaction (ORR) over chemically polymerized PEDOT:Cl still remains controversial with eventual role of transition metal impurities. However, regardless of the mechanistic route, we here demonstrate yet another key active role of PEDOT in the ORR mechanism...
March 7, 2017: Journal of Materials Chemistry. A, Materials for Energy and Sustainability
https://www.readbyqxmd.com/read/28580143/tunable-thermodynamic-activity-of-la-x-sr-1-x-mn-y-al-1-y-o-3-%C3%AE-0-%C3%A2-x-%C3%A2-1-0-%C3%A2-y-%C3%A2-1-perovskites-for-solar-thermochemical-fuel-synthesis
#15
M Ezbiri, M Takacs, D Theiler, R Michalsky, A Steinfeld
Nonstoichiometric metal oxides with variable valence are attractive redox materials for thermochemical and electrochemical fuel processing. To guide the design of advanced redox materials for solar-driven splitting of CO2 and/or H2 O to produce CO and/or H2 (syngas), we investigate the equilibrium thermodynamics of the La x Sr1- x Mn y Al1- y O3- δ perovskite family (0 ≤ x ≤ 1, 0 ≤ y ≤ 1) and La0.6 Ca0.4 Mn0.8 Al0.2 O3- δ , and compare them to those of CeO2 as the baseline. Oxygen nonstoichiometry measurements from 1573 to 1773 K and from 0...
February 28, 2017: Journal of Materials Chemistry. A, Materials for Energy and Sustainability
https://www.readbyqxmd.com/read/28261480/a-solid-oxide-photoelectrochemical-cell-with-uv-light-driven-oxygen-storage-in-mixed-conducting-electrodes
#16
Gregor Walch, Bernhard Rotter, Georg Christoph Brunauer, Esmaeil Esmaeili, Alexander Karl Opitz, Markus Kubicek, Johann Summhammer, Karl Ponweiser, Jürgen Fleig
A single crystalline SrTiO3 working electrode in a zirconia-based solid oxide electrochemical cell is illuminated by UV light at temperatures of 360-460 °C. In addition to photovoltaic effects, this leads to the build-up of a battery-type voltage up to more than 300 mV. After switching off UV light, this voltage only slowly decays. It is caused by UV-induced oxygen incorporation into the mixed conducting working electrode and thus by changes of the oxygen stoichiometry δ in SrTiO3- δ under UV illumination...
January 28, 2017: Journal of Materials Chemistry. A, Materials for Energy and Sustainability
https://www.readbyqxmd.com/read/29170714/reduced-bimolecular-recombination-in-blade-coated-high-efficiency-small-molecule-solar-cells
#17
Sebastian Engmann, Hyun Wook Ro, Andrew A Herzing, Dean M DeLongchamp, Chad R Snyder, Lee J Richter, Adam Barito, David J Gundlach
To realize the full promise of solution deposited photovoltaic devices requires processes compatible with high-speed manufacturing. We report the performance and morphology of blade-coated bulk heterojunction devices based on the small molecule donor p-DTS(FBTTh2 )2 when treated with a post-deposition solvent vapor annealing (SVA) process. SVA with tetrahydrofuran improves the device performance of blade-coated films more than solvent additive processing (SA) with 1,8-diiodooctane. In spin-coating, SA and SVA achieve similar device performance...
2017: Journal of Materials Chemistry. A, Materials for Energy and Sustainability
https://www.readbyqxmd.com/read/29308200/enhanced-charge-carrier-transport-properties-in-colloidal-quantum-dot-solar-cells-via-organic-and-inorganic-hybrid-surface-passivation
#18
John Hong, Bo Hou, Jongchul Lim, Sangyeon Pak, Byung-Sung Kim, Yuljae Cho, Juwon Lee, Young-Woo Lee, Paul Giraud, Sanghyo Lee, Jong Bae Park, Stephen M Morris, Henry J Snaith, Jung Inn Sohn, SeungNam Cha, Jong Min Kim
Colloidal quantum dots (CQDs) are extremely promising as photovoltaic materials. In particular, the tunability of their electronic band gap and cost effective synthetic procedures allow for the versatile fabrication of solar energy harvesting cells, resulting in optimal device performance. However, one of the main challenges in developing high performance quantum dot solar cells (QDSCs) is the improvement of the photo-generated charge transport and collection, which is mainly hindered by imperfect surface functionalization, such as the presence of surface electronic trap sites and the initial bulky surface ligands...
December 28, 2016: Journal of Materials Chemistry. A, Materials for Energy and Sustainability
https://www.readbyqxmd.com/read/28439415/stretchable-biofuel-cells-as-wearable-textile-based-self-powered-sensors
#19
Itthipon Jeerapan, Juliane R Sempionatto, Adriana Pavinatto, Jung-Min You, Joseph Wang
Highly stretchable textile-based biofuel cells (BFCs), acting as effective self-powered sensors, have been fabricated using screen-printing of customized stress-enduring inks. Due to synergistic effects of nanomaterial-based engineered inks and the serpentine designs, these printable bioelectronic devices endure severe mechanical deformations, e.g., stretching, indentation, or torsional twisting. Glucose and lactate BFCs with the single enzyme and membrane-free configurations generated the maximum power density of 160 and 250 µW cm-2 with the open circuit voltages of 0...
December 21, 2016: Journal of Materials Chemistry. A, Materials for Energy and Sustainability
https://www.readbyqxmd.com/read/28210491/film-morphology-evolution-during-solvent-vapor-annealing-of-highly-efficient-small-molecule-donor-acceptor-blends
#20
Sebastian Engmann, Hyun Wook Ro, Andrew Herzing, Chad R Snyder, Lee J Richter, Paul B Geraghty, David J Jones
Solution-processable small molecule photovoltaics based on the novel molecular donor, benzodithiophene terthiophene rhodanine (BTR), recently have shown maximum power conversion efficiencies above 8 % for active layer thicknesses up to 400 nm, using post process solvent vapor annealing (SVA) with tetrahydrofuran (THF). Here we report an in-situ study on the morphology evolution during SVA using the moderate solvent THF and the good solvent chloroform (CF). The combination of real-time grazing incidence X-ray diffraction (GIXD) and grazing incidence small angle X-ray scattering (GISAXS) allows us to draw a complete picture of the evolution of crystallinity and phase purity during post process annealing...
October 28, 2016: Journal of Materials Chemistry. A, Materials for Energy and Sustainability
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