Electrocatalytic production of methanol from CO 2 has recently been studied. This paper focuses on understanding the role carbonic anhydrase to efficiently facilitate uptake , which can be rate determining step. The three oxidoreductase enzymes responsible for reduction are formate, aldehyde, and alcohol dehydrogenase. enzyme cascade was coupled a poly(neutral red) modified electrode regenerate NADH. We have found that dehydrogenases alone achieve but process is accelerated by addition...

Abstract In this study, we demonstrate that the La 0.3 Sr 0.7 Fe Cr O 3– δ (LSFCr) perovskite, examined here as a CO/CO 2 fuel electrode material intended for symmetrical, reversible solid oxide cell (RSOFC) applications, is both high performing and stable towards CO electrolysis (SOEC mode) oxidation of (SOFC mode). To this, symmetrical LSFCr/GDC/YSZ/GDC/LSFCr cells were evaluated electrochemically by using DC (cyclic voltammetry (CV) galvanostatic) AC (impedance) techniques. The tested at...

The use of a single porous mixed ion-electron conducting (MIEC) material as both the oxygen and fuel electrodes in reversible solid oxide cells is increasing interest, primarily due to resulting simplified cell design lower manufacturing costs. In this work, La_0.3Sr_0.7Fe_0.7Cr_0.3O_3−δ (LSFCr-3) was studied 3-electrode half-cell configuration air, pure CO₂ 1 : CO mixture, over temperature range 650–800 °C. A detailed analysis...

Abstract Previous work by the group has entailed encapsulating enzymes in polymeric micelles at bioelectrode surfaces utilizing hydrophobically modified Nafion membranes, which are order to eliminate harsh acidity of while tailoring size polymer optimize for encapsulation an individual enzyme. This been shown provide high catalytic activity and enzyme stability. In this study, we employed technique developing a methanol/air biofuel cell through combined immobilization NAD + ‐dependent...

A detailed study aimed at understanding and confirming the reported highly promising performance of a La0.3Sr0.7Fe0.7Cr0.3O3-δ (LSFCr) perovskite catalyst in CO2/CO mixtures, for use reversible solid oxide fuel cells (RSOFCs), is this work, with an emphasis on chemical stability. This work includes X-ray diffraction (XRD), thermogravimetric analysis (TGA), electrochemical range pO2 atmospheres (pure CO2, CO alone (balance N2), 90-70% CO2/10-30% containing mixture), related to different...

The aim of the study was to investigate customer satisfaction’s mediation role in relationship between service quality and loyalty within Ghana’s telecommunication sector. report followed an approach quantitative analysis questionnaires collect data from 105 respondents. statistical performed using descriptive methods inferential techniques IBM SPSS. made Hayes' PROCESS macro model 4. Results showed that is a substantially positive indicator loyalty. It also evident Service Quality had...

The support vector machine model produced the best results with a root mean square error of 1.54 × 10 −6 K −1 . was applied to 3 593 726 possible AA′BB′O compositions, resulting in 150 451 predictions confidence region.

Our recent studies have shown that La0.3Ca0.7Fe0.7Cr0.3O3-δ (LCFCr) is an extremely promising material for use as air electrode in reversible solid oxide cells (RSOFCS), due to its excellent activity towards the oxygen reduction and evolution reactions. LCFCr has also been be a very active catalyst CO2/CO reactions at fuel electrode, thus making it good candidate symmetrical RSOFCs. In present work, GDC + polymeric precursor solutions were infiltrated into porous scaffold further enhance...

A solid oxide fuel cell (SOFC) plays a significant role in converting chemically stored energy to electrical by using clean and renewable fuels, such as H2 CO. The LSFCr (La0.3Sr0.7Fe0.7Cr0.3O3) perovskite is one of the few materials that especially efficient stable reversible SOFC (RSOFC) performing not only direct reaction generate power but also CO2 conversion back Many surface chemical reactions were studied for different perovskites, reduction CO at gaseous conditions has been reported...

Symmetrical full cells, based on La 0.3 M 0.7 Fe Cr O 3- δ (M = Sr, Ca) perovskite oxide electrodes, were constructed, using a Yttria-stabilized zirconia (YSZ) electrolyte with Samaria-doped ceria (SDC) buffer layer, and then tested in range of fuel environments at 800 o C. It is demonstrated that the Ca analog (La 3-δ -LCFCr) an equally good electrode (anode) air (cathode) as Sr member this family (LSFCr), exhibiting very electrochemical performance H 2 , CO +CO atmospheres. LCFCr LSFCr...

Ni–YSZ (yttria-stabilized zirconia) cermets are known to be very good anodes in solid oxide fuel cells (SOFCs), which typically operated at 700–1000 °C. However, they expected increasingly degraded as the operating temperature is lowered presence of H2S (5–10 ppm) H2 stream. 500 600 °C, a range rarely examined for sulphur poisoning, but great interest next generation SOFCs, we report that H2S-exposed catalytic towards oxidation reaction, rather than poisoned. By analogy with bulk Ni3S2/YSZ...

The goal of the current work was to identify an air-side-optimized contact material for La0.3Ca0.7Fe0.7Cr0.3O3−δ (LCFCr) electrodes and a Crofer22APU interconnect use in reversible solid oxide fuel cells (RSOFCs). LaNi0.6Co0.4−xFexO3 (x = 0–0.3) perovskite-type oxides were investigated this work. partial substitution Co by Fe decreased thermal expansion coefficient values (TEC) closer LCFCr Crofer 22 APU interconnects. synthesized using glycine–nitrate method characterized X-ray...

Our recent studies have shown that La 0.3 Ca 0.7 Fe Cr O 3- δ (LCFCr) is a promising material as an air electrode for use in reversible solid oxide cells, due to its excellent activity towards the oxygen reduction and evolution reactions, along with good thermal expansion coefficient match common electrolytes, such gadolinium-doped ceria (GDC). In present work, GDC was infiltrated into pre-sintered, porous, LCFCr scaffold, forming porous layer on surface. This resulted further improvements...

In this study, the electrochemical performance of a single phase, mixed ion and electron conducting (MIEC) Ce0.8Y0.1Mn0.1O2-δ (10CYMO) anode was evaluated using symmetrical half-cell full-cell configurations under humidified H2, 10 ppm H2S/H2, CH4. An yttria-stabilized zirconia (YSZ) electrolyte support layer used in work, as ac impedance spectroscopy revealed that 10CYMO/YSZ/10CYMO cell gave lowest area specific polarization resistance (ASR) 0.23 Ωcm2 at 800°C wet compared to...

Mixed conducting La 0.3 Sr 0.7 Fe Cr O 3-δ (LSFCr) perovskite electrodes have been shown in our prior work to exhibit very good catalytic activity as both a CO 2 /CO fuel electrode and an air [1,2], making them ideal for use symmetrical, reversible, solid oxide cells (RSOFCs). On the side, LSFCr has higher reduction than oxidation [1,2] also displayed stability over ca. 100 hours of operation. However, it was interest better understand chemical environments, determine if performance could be...

There is great interest in the development of SOFCs that can be operated reverse electrolysis mode, thus producing fuels and oxygen, while also serving as an electricity storage medium for renewable energy. In solid oxide cell (SOEC), steam converted to H 2 O together with CO generate syngas 2. High temperature operation (700-950 o C) water cells significantly increases performance SOECs, compared PEM-based systems. However, obstacle operating at high temperatures lower stability materials,...

The primary focus of our work has been on the development a stable mixed ionic and electronic conducting (MIEC) oxide electrode that is catalytic for application as an air in reversible solid fuel cells (RSOFCs). For this purpose, recently developed La 0.3 Sr 0.7 Fe Cr O 3-δ (LSFCr) material [1], shown to be active both anode cathode symmetrical SOFCs, modified by replacing A site with Ca, producing Ca 3- δ (LCFCr), which very promising oxygen SOFCs [2-4]. In present work, we are working...

Previously, we have shown that a symmetrical La 0.3 Ca 0.7 Fe Cr O 3-δ (LCFCr) SOFC full cell (LCFCr used at both electrodes) exhibits very good electrochemical performance in H 2 and CO the fuel also has sulfur tolerance wet with low ppm S content 800 o C [1]. In fact, somewhat enhanced of LCFCr anode towards hydrogen oxidation reaction was observed under these conditions However, effect temperature, which is known to significant impact on conventional Ni-based anodes [2-6], not yet been...