The Experts below are selected from a list of 14718 Experts worldwide ranked by ideXlab platform
Yuefeng Song - One of the best experts on this subject based on the ideXlab platform.
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improving the performance of solid oxide Electrolysis Cell with gold nanoparticles modified lsm ysz anode
Journal of Energy Chemistry, 2019Co-Authors: Yuefeng Song, Xiaomin Zhang, Yingjie Zhou, Houfu Lv, Weicheng Feng, Guoxiong WangAbstract:Abstract Gold, as the common current collector in solid oxide Electrolysis Cell (SOEC), is traditionally considered to be inert for oxygen evolution reaction at the anode of SOEC. Herein, gold nanoparticles were loaded onto conventional strontium doped lanthanum manganite-yttria stabilized zirconia (LSM-YSZ) anode, which evidently improved the performance of oxygen evolution reaction at 800 °C. The current densities at 1.2 V and 1.4 V increased by 60.0% and 46.9%, respectively, after loading gold nanoparticles onto the LSM-YSZ anode. Physicochemical characterizations and electrochemical measurements suggested that the improved SOEC performance was attributed to the accelerated electron transfer of elementary process in anodic polarization reaction and the newly generated triple phase boundaries in gold nanoparticles-loaded LSM-YSZ anode.
Bruce E. Rittmann - One of the best experts on this subject based on the ideXlab platform.
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fermentation pre treatment of landfill leachate for enhanced electron recovery in a microbial Electrolysis Cell
Bioresource Technology, 2014Co-Authors: Mohamed Mahmoud, César I. Torres, Prathap Parameswaran, Bruce E. RittmannAbstract:Abstract Pre-fermentation of poorly biodegradable landfill leachate (BOD 5 /COD ratio of 0.32) was evaluated for enhanced current density ( j ), Coulombic efficiency (CE), Coulombic recovery (CR), and removal of organics (BOD 5 and COD) in a microbial Electrolysis Cell (MEC). During fermentation, the complex organic matter in the leachate was transformed to simple volatile fatty acids, particularly succinate and acetate in batch tests, but mostly acetate in semi-continuous fermentation. Carbohydrate had the highest degree of fermentation, followed by protein and lipids. j , CE, CR, and BOD 5 removal were much greater for an MEC fed with fermented leachate (23 A/m 3 or 16 mA/m 2 , 68%, 17.3%, and 83%, respectively) compared to raw leachate (2.5 A/m 3 or 1.7 mA/m 2 , 56%, 2.1%, and 5.6%, respectively). All differences support the value of pre-fermentation before an MEC for stabilization of BOD 5 and enhanced electron recovery as current when treating a recalcitrant wastewater like landfill leachate.
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significance of biological hydrogen oxidation in a continuous single chamber microbial Electrolysis Cell
Environmental Science & Technology, 2010Co-Authors: Hyung-sool Lee, Bruce E. RittmannAbstract:A single-chamber microbial Electrolysis Cell (MEC) that used a high density of nonmetal-catalyst carbon fibers as the anode achieved high volumetric current densities from 1470 ± 60 to 1630 ± 50 A/m3 for a hydraulic retention time of 1.6−6.5 h. The high current density was driven by a large anode surface area and corresponded to a volumetric chemical oxygen demand (COD)-removal rate of 27−49 kg COD/m3·d. Observed H2 harvesting rates were from 2.6 ± 0.10 to 4.3 ± 0.46 m3 H2/m3·d, but the H2 production rates computed from the current densities were 16.3−18.2 m3 H2/m3·d. Tracking all significant electron sinks (residual acetate, H2, CH4, biomass, and soluble microbial products (SMP)) in the single-chamber MEC showed that H2 reoxidation by anode-respiring bacteria recycled H2 between the cathode and the anode, and this caused the large discrepancy in H2 production and harvest rates. H2 recycle accounted for 62−76% of observed current density, and this made the observed Coulombic efficiency 190−310% at steady ...
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characterization of energy losses in an upflow single chamber microbial Electrolysis Cell
International Journal of Hydrogen Energy, 2010Co-Authors: Hyung-sool Lee, Bruce E. RittmannAbstract:Abstract We characterized electrode energy losses and ohmic energy loss in an upflow, single-chamber microbial Electrolysis Cell (MEC) with no metal catalyst on the cathode. The MEC produced 0.57 m 3 -H 2 /m 3 -d at an applied voltage of ∼1 V and achieved a cathodic conversion efficiency of 98% and a H 2 yield of 2.4 mol H 2 /mol acetate. Eliminating the membrane lowered the ohmic energy loss to 0.005 V, and the pH energy loss became as small as 0.072 V. The lack of metal catalyst on the cathode led to a significant cathode energy loss of 0.56 V. The anode energy loss also was relatively large at 0.395 V, but this was artificial, due to the high positive anode potential, poised at +0.07 V (vs. the standard hydrogen electrode). The energy-conversion efficiency (ECE) was 75% in the single-chamber MEC when the energy input and outputs were compared directly as electrical energy. To achieve an energy benefit out of an MEC (i.e., an ECE >100%), the applied voltage must be less than 0.6 V with a cathodic conversion efficiency over 80%. An ECE of 180% could be achieved if the anode and cathode energy losses were reduced to 0.2 V each.
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fate of h2 in an upflow single chamber microbial Electrolysis Cell using a metal catalyst free cathode
Environmental Science & Technology, 2009Co-Authors: César I. Torres, Prathap Parameswaran, Bruce E. RittmannAbstract:With the goal of maximizing the H2-harvesting efficiency, we designed an upflow single-chamber microbial Electrolysis Cell (MEC) by placing the cathode on the top of the MEC and carried out a program to track the fate of H2 and electron equivalents in batch experiments. When the initial acetate concentration was 10 mM in batch-evaluation experiments lasting 32 h, the cathodic conversion efficiency (CCE) from coulombs (i.e., electron equivalents in current from the anode to the cathode) to H2 was 98 ± 2%, the Coulombic efficiency (CE) was 60 ± 1%, the H2 yield was 59 ± 2%, and methane production was negligible. However, longer batch reaction time (∼ 7 days) associated with higher initial acetate concentrations (30 or 80 mM) led to significant H2 loss due to CH4 accumulation: up to 14 ± 1% and 16 ± 2% of the biogas at 30 and 80 mM of acetate, respectively. Quantitative PCR proved that no acetoclastic methanogens were present, but that hydrogenotrophic methanogens (i.e., Methanobacteriales) were present on b...
Guoxiong Wang - One of the best experts on this subject based on the ideXlab platform.
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improving the performance of solid oxide Electrolysis Cell with gold nanoparticles modified lsm ysz anode
Journal of Energy Chemistry, 2019Co-Authors: Yuefeng Song, Xiaomin Zhang, Yingjie Zhou, Houfu Lv, Weicheng Feng, Guoxiong WangAbstract:Abstract Gold, as the common current collector in solid oxide Electrolysis Cell (SOEC), is traditionally considered to be inert for oxygen evolution reaction at the anode of SOEC. Herein, gold nanoparticles were loaded onto conventional strontium doped lanthanum manganite-yttria stabilized zirconia (LSM-YSZ) anode, which evidently improved the performance of oxygen evolution reaction at 800 °C. The current densities at 1.2 V and 1.4 V increased by 60.0% and 46.9%, respectively, after loading gold nanoparticles onto the LSM-YSZ anode. Physicochemical characterizations and electrochemical measurements suggested that the improved SOEC performance was attributed to the accelerated electron transfer of elementary process in anodic polarization reaction and the newly generated triple phase boundaries in gold nanoparticles-loaded LSM-YSZ anode.
Houfu Lv - One of the best experts on this subject based on the ideXlab platform.
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improving the performance of solid oxide Electrolysis Cell with gold nanoparticles modified lsm ysz anode
Journal of Energy Chemistry, 2019Co-Authors: Yuefeng Song, Xiaomin Zhang, Yingjie Zhou, Houfu Lv, Weicheng Feng, Guoxiong WangAbstract:Abstract Gold, as the common current collector in solid oxide Electrolysis Cell (SOEC), is traditionally considered to be inert for oxygen evolution reaction at the anode of SOEC. Herein, gold nanoparticles were loaded onto conventional strontium doped lanthanum manganite-yttria stabilized zirconia (LSM-YSZ) anode, which evidently improved the performance of oxygen evolution reaction at 800 °C. The current densities at 1.2 V and 1.4 V increased by 60.0% and 46.9%, respectively, after loading gold nanoparticles onto the LSM-YSZ anode. Physicochemical characterizations and electrochemical measurements suggested that the improved SOEC performance was attributed to the accelerated electron transfer of elementary process in anodic polarization reaction and the newly generated triple phase boundaries in gold nanoparticles-loaded LSM-YSZ anode.
Weicheng Feng - One of the best experts on this subject based on the ideXlab platform.
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improving the performance of solid oxide Electrolysis Cell with gold nanoparticles modified lsm ysz anode
Journal of Energy Chemistry, 2019Co-Authors: Yuefeng Song, Xiaomin Zhang, Yingjie Zhou, Houfu Lv, Weicheng Feng, Guoxiong WangAbstract:Abstract Gold, as the common current collector in solid oxide Electrolysis Cell (SOEC), is traditionally considered to be inert for oxygen evolution reaction at the anode of SOEC. Herein, gold nanoparticles were loaded onto conventional strontium doped lanthanum manganite-yttria stabilized zirconia (LSM-YSZ) anode, which evidently improved the performance of oxygen evolution reaction at 800 °C. The current densities at 1.2 V and 1.4 V increased by 60.0% and 46.9%, respectively, after loading gold nanoparticles onto the LSM-YSZ anode. Physicochemical characterizations and electrochemical measurements suggested that the improved SOEC performance was attributed to the accelerated electron transfer of elementary process in anodic polarization reaction and the newly generated triple phase boundaries in gold nanoparticles-loaded LSM-YSZ anode.