Yaoli Ye - Academia.edu (original) (raw)

Papers by Yaoli Ye

Research paper thumbnail of Tensile-Strained PlatinumCobalt Alloy Surface on Palladium Octahedra as a Highly Durable Oxygen Reduction Catalyst

Research paper thumbnail of The Effect of Buffer Charge and Buffer Retention on Bioelectrochemical Systems and Post-Treatment for Microbial Fuel Cell Effluent with Fluidized Bed Membrane Bioreactors

Research paper thumbnail of The importance of OH− transport through anion exchange membrane in microbial electrolysis cells

International Journal of Hydrogen Energy, 2018

Research paper thumbnail of Combined carbon mesh and small graphite fiber brush anodes to enhance and stabilize power generation in microbial fuel cells treating domestic wastewater

Journal of Power Sources, 2017

h i g h l i g h t s A novel composite anode was developed that combined brushes and carbon mesh. ... more h i g h l i g h t s A novel composite anode was developed that combined brushes and carbon mesh. The composite anode had higher power output and CEs than either of the other anodes. Power overshoot was mitigated with the composite anode MFCs at higher CODs. MFCs with the composite anode had less cathode biomass growth. The carbon mesh with biofilms in the composite anode also functioned as a separator.

Research paper thumbnail of An aerated and fluidized bed membrane bioreactor for effective wastewater treatment with low membrane fouling

Environ. Sci.: Water Res. Technol., 2016

An aerobic fluidized bed membrane bioreactor (AOFMBR) with GAC particles suspended by rising air ... more An aerobic fluidized bed membrane bioreactor (AOFMBR) with GAC particles suspended by rising air bubbles had low membrane fouling.

Research paper thumbnail of Effect of buffer charge on performance of air-cathodes used in microbial fuel cells

Electrochimica Acta, 2016

Highlights 1. Effect of buffer charge and pKa was examined on cathode performance 2. Cationic buf... more Highlights 1. Effect of buffer charge and pKa was examined on cathode performance 2. Cationic buffers enhanced current by as much as 95% at a pH below 8 3. There was no impact on current for buffers with a neutral or negative charge 4. The range of potential is expanded for an increase in net positive charge.

Research paper thumbnail of The effect of biofilm thickness on electrochemical activity of Geobacter sulfurreducens

International Journal of Hydrogen Energy, 2016

Abstract It is widely believed that the high electrochemical performance of Geobacter sulfurreduc... more Abstract It is widely believed that the high electrochemical performance of Geobacter sulfurreducens relies on its thick and conductive biofilms in bioelectrochemical systems. However, in this study, the G. sulfurreducens biofilm reached the highest electrochemical activity with a biofilm thickness of ∼20 μm, and then the electrochemical activity decreased with increasing thickness until the biofilm growth ceased at a thickness of ∼45 μm. The electrochemical analysis and the metabolic spatial variability showed that in the first 5 cycles the live cells grew fast, which led to a rapid drop of charge transfer resistance and further contributed to high current generation, however, from cycle 5 to 12, a great many inactive cells accumulated in the inner layer of biofilm, which resulted in high diffusion resistance. Thus, although the G. sulfurreducens can always form thick biofilms, its highest electrochemical activity reached at a much thinner thickness, suggesting that the live-cell mass rather than the biofilm thickness is responsible for the high current generation.

Research paper thumbnail of Performance of anaerobic fluidized membrane bioreactors using effluents of microbial fuel cells treating domestic wastewater

Bioresource technology, Jan 22, 2016

Anaerobic fluidized membrane bioreactors (AFMBRs) have been mainly developed as a post-treatment ... more Anaerobic fluidized membrane bioreactors (AFMBRs) have been mainly developed as a post-treatment process to produce high quality effluent with very low energy consumption. The performance of an AFMBR was examined using the effluent from a microbial fuel cell (MFC) treating domestic wastewater, as a function of AFMBR hydraulic retention times (HRTs) and organic matter loading rates. The MFC-AFMBR achieved 89±3% removal of the chemical oxygen demand (COD), with an effluent of 36±6mg-COD/L over 112days operation. The AFMBR had very stable operation, with no significant changes in COD removal efficiencies, for HRTs ranging from 1.2 to 3.8h, although the effluent COD concentration increased with organic loading. Transmembrane pressure (TMP) was low, and could be maintained below 0.12bar through solids removal. This study proved that the AFMBR could be operated with a short HRT but a low COD loading rate was required to achieve low effluent COD.

Research paper thumbnail of Enhancing power generation of scale-up microbial fuel cells by optimizing the leading-out terminal of anode

Journal of Power Sources, 2014

h i g h l i g h t s A simple model to simulate the power loss of scale up microbial fuel cell. Le... more h i g h l i g h t s A simple model to simulate the power loss of scale up microbial fuel cell. Leading-out terminal could result in more than 47.1% of power loss. Leading-out terminal of anode is one of the key factors for scaling up MFC.

Research paper thumbnail of Effects of hydraulic pressure on the performance of single chamber air-cathode microbial fuel cells

Biosensors and Bioelectronics, 2014

Scaling up of microbial fuel cells (MFCs) without losing power density requires a thorough unders... more Scaling up of microbial fuel cells (MFCs) without losing power density requires a thorough understanding of the effect of hydraulic pressure on MFC performance. In this work, the performance of an activated carbon air-cathode MFC was evaluated under different hydraulic pressures. The MFC under 100 mmH2O hydraulic pressure produced a maximum power density of 1260 ± 24 mW m(-2), while the power density decreased by 24.4% and 44.7% as the hydraulic pressure increased to 500 mmH2O and 2000 mmH2O, respectively. Notably, the performance of both the anode and the cathode had decreased under high hydraulic pressures. Electrochemical impedance spectroscopy tests of the cathode indicated that both charge transfer resistance and diffusion transfer resistance increased with the increase in hydraulic pressure. Denaturing gradient gel electrophoresis of PCR-amplified partial 16S rRNA genes demonstrated that the similarity among anodic biofilm communities under different hydraulic pressures was ≥ 90%, and the communities of all MFCs were dominated by Geobacter sp. These results suggested that the reduction in power output of the single chamber air-cathode MFC under high hydraulic pressures can be attributed to water flooding of the cathode and suppression the metabolism of anodic exoelectrogenic bacteria.

Research paper thumbnail of Impact of acclimation methods on microbial communities and performance of anaerobic fluidized bed membrane bioreactors

Environ. Sci.: Water Res. Technol., 2016

Granular activated carbon was acclimated to different substrates, and then used in an anaerobic f... more Granular activated carbon was acclimated to different substrates, and then used in an anaerobic fluidized bed membrane bioreactor (AFMBR) to treat diluted domestic wastewater. Acetate acclimation produced the best results.

Research paper thumbnail of Simultaneous nitrogen and organics removal using membrane aeration and effluent ultrafiltration in an anaerobic fluidized membrane bioreactor

Dissolved methane and a lack of nutrient removal are two concerns for treatment of wastewater usi... more Dissolved methane and a lack of nutrient removal are two concerns for treatment of wastewater using anaerobic fluidized bed membrane bioreactors (AFMBRs). Membrane aerators were integrated into an AFMBR to form an aeration membrane fluidized bed membrane bioreactor (AeMFMBR) capable of simultaneous removal of organic matter and ammonia without production of dissolved methane. Good effluent quality was obtained with no detectable suspended solids, 93±5% of chemical oxygen demand (COD) removal to 14±11mg/L, and 74±8% of total ammonia (TA) removal to 12±3mg-N/L for domestic wastewater (COD of 193±23mg/L and TA of 49±5mg-N/L) treatment. Nitrate and nitrite concentrations were always low (<1mg-N/L) during continuous flow treatment. Membrane fouling was well controlled by fluidization of the granular activated carbon (GAC) particles (transmembrane pressures maintained <3kPa). Analysis of the microbial communities suggested that nitrogen removal was due to nitrification and denitrifi...

Research paper thumbnail of Effects of hydraulic pressure on the performance of single chamber air-cathode microbial fuel cells

Biosensors and Bioelectronics, 2014

Scaling up of microbial fuel cells (MFCs) without losing power density requires a thorough unders... more Scaling up of microbial fuel cells (MFCs) without losing power density requires a thorough understanding of the effect of hydraulic pressure on MFC performance. In this work, the performance of an activated carbon air-cathode MFC was evaluated under different hydraulic pressures. The MFC under 100 mmH 2 O hydraulic pressure produced a maximum power density of 1260 724 mW m -2 , while the power density decreased by 24.4% and 44.7% as the hydraulic pressure increased to 500 mmH 2 O and 2000 mmH 2 O, respectively. Notably, the performance of both the anode and the cathode had decreased under high hydraulic pressures. Electrochemical impedance spectroscopy tests of the cathode indicated that both charge transfer resistance and diffusion transfer resistance increased with the increase in hydraulic pressure. Denaturing gradient gel electrophoresis of PCR-amplified partial 16S rRNA genes demonstrated that the similarity among anodic biofilm communities under different hydraulic pressures was Z90%, and the communities of all MFCs were dominated by Geobacter sp. These results suggested that the reduction in power output of the single chamber air-cathode MFC under high hydraulic pressures can be attributed to water flooding of the cathode and suppression the metabolism of anodic exoelectrogenic bacteria.

Research paper thumbnail of Enhancing power generation of scale-up microbial fuel cells by optimizing the leading-out terminal of anode

Journal of Power Sources, 2014

A simple model to simulate the power loss of scale up microbial fuel cell. Leading-out terminal c... more A simple model to simulate the power loss of scale up microbial fuel cell. Leading-out terminal could result in more than 47.1% of power loss. Leading-out terminal of anode is one of the key factors for scaling up MFC. a b s t r a c t Low power output and high cost are two major challenges for scaling up microbial fuel cell (MFC). The ohmic resistance of anode increasing as MFCs scale up can be one of main reasons for power density decrease. We present a simple model to simulate power loss and potential drop distribution caused by ohmic resistance of carbon mesh anodes with different dimensions and various leading-out terminals. We also conduct experiments to confirm the simulation work and the large impact of anode ohmic resistance on large-scale MFCs by varying leading-out configurations. The simulation results show that the power loss with an anode size of 1 m 2 can be as high as 4.19 W at current density of 3 A m À2 , and the power loss can be decreased to 0.04 W with optimized configuration of leading-out terminals and to 0.01 W by utilizing brass mesh as anode material. The experiments well confirm the simulation results with the deviations less than 11.0%. Furthermore, the experiment results also show that more than 47.1% of the power loss from small-scale to large-scale MFC comes from bad-leading-out terminal. These results demonstrate that leading-out terminal of anode is one of the key factors for scaling up MFC.

Research paper thumbnail of Tensile-Strained PlatinumCobalt Alloy Surface on Palladium Octahedra as a Highly Durable Oxygen Reduction Catalyst

Research paper thumbnail of The Effect of Buffer Charge and Buffer Retention on Bioelectrochemical Systems and Post-Treatment for Microbial Fuel Cell Effluent with Fluidized Bed Membrane Bioreactors

Research paper thumbnail of The importance of OH− transport through anion exchange membrane in microbial electrolysis cells

International Journal of Hydrogen Energy, 2018

Research paper thumbnail of Combined carbon mesh and small graphite fiber brush anodes to enhance and stabilize power generation in microbial fuel cells treating domestic wastewater

Journal of Power Sources, 2017

h i g h l i g h t s A novel composite anode was developed that combined brushes and carbon mesh. ... more h i g h l i g h t s A novel composite anode was developed that combined brushes and carbon mesh. The composite anode had higher power output and CEs than either of the other anodes. Power overshoot was mitigated with the composite anode MFCs at higher CODs. MFCs with the composite anode had less cathode biomass growth. The carbon mesh with biofilms in the composite anode also functioned as a separator.

Research paper thumbnail of An aerated and fluidized bed membrane bioreactor for effective wastewater treatment with low membrane fouling

Environ. Sci.: Water Res. Technol., 2016

An aerobic fluidized bed membrane bioreactor (AOFMBR) with GAC particles suspended by rising air ... more An aerobic fluidized bed membrane bioreactor (AOFMBR) with GAC particles suspended by rising air bubbles had low membrane fouling.

Research paper thumbnail of Effect of buffer charge on performance of air-cathodes used in microbial fuel cells

Electrochimica Acta, 2016

Highlights 1. Effect of buffer charge and pKa was examined on cathode performance 2. Cationic buf... more Highlights 1. Effect of buffer charge and pKa was examined on cathode performance 2. Cationic buffers enhanced current by as much as 95% at a pH below 8 3. There was no impact on current for buffers with a neutral or negative charge 4. The range of potential is expanded for an increase in net positive charge.

Research paper thumbnail of The effect of biofilm thickness on electrochemical activity of Geobacter sulfurreducens

International Journal of Hydrogen Energy, 2016

Abstract It is widely believed that the high electrochemical performance of Geobacter sulfurreduc... more Abstract It is widely believed that the high electrochemical performance of Geobacter sulfurreducens relies on its thick and conductive biofilms in bioelectrochemical systems. However, in this study, the G. sulfurreducens biofilm reached the highest electrochemical activity with a biofilm thickness of ∼20 μm, and then the electrochemical activity decreased with increasing thickness until the biofilm growth ceased at a thickness of ∼45 μm. The electrochemical analysis and the metabolic spatial variability showed that in the first 5 cycles the live cells grew fast, which led to a rapid drop of charge transfer resistance and further contributed to high current generation, however, from cycle 5 to 12, a great many inactive cells accumulated in the inner layer of biofilm, which resulted in high diffusion resistance. Thus, although the G. sulfurreducens can always form thick biofilms, its highest electrochemical activity reached at a much thinner thickness, suggesting that the live-cell mass rather than the biofilm thickness is responsible for the high current generation.

Research paper thumbnail of Performance of anaerobic fluidized membrane bioreactors using effluents of microbial fuel cells treating domestic wastewater

Bioresource technology, Jan 22, 2016

Anaerobic fluidized membrane bioreactors (AFMBRs) have been mainly developed as a post-treatment ... more Anaerobic fluidized membrane bioreactors (AFMBRs) have been mainly developed as a post-treatment process to produce high quality effluent with very low energy consumption. The performance of an AFMBR was examined using the effluent from a microbial fuel cell (MFC) treating domestic wastewater, as a function of AFMBR hydraulic retention times (HRTs) and organic matter loading rates. The MFC-AFMBR achieved 89±3% removal of the chemical oxygen demand (COD), with an effluent of 36±6mg-COD/L over 112days operation. The AFMBR had very stable operation, with no significant changes in COD removal efficiencies, for HRTs ranging from 1.2 to 3.8h, although the effluent COD concentration increased with organic loading. Transmembrane pressure (TMP) was low, and could be maintained below 0.12bar through solids removal. This study proved that the AFMBR could be operated with a short HRT but a low COD loading rate was required to achieve low effluent COD.

Research paper thumbnail of Enhancing power generation of scale-up microbial fuel cells by optimizing the leading-out terminal of anode

Journal of Power Sources, 2014

h i g h l i g h t s A simple model to simulate the power loss of scale up microbial fuel cell. Le... more h i g h l i g h t s A simple model to simulate the power loss of scale up microbial fuel cell. Leading-out terminal could result in more than 47.1% of power loss. Leading-out terminal of anode is one of the key factors for scaling up MFC.

Research paper thumbnail of Effects of hydraulic pressure on the performance of single chamber air-cathode microbial fuel cells

Biosensors and Bioelectronics, 2014

Scaling up of microbial fuel cells (MFCs) without losing power density requires a thorough unders... more Scaling up of microbial fuel cells (MFCs) without losing power density requires a thorough understanding of the effect of hydraulic pressure on MFC performance. In this work, the performance of an activated carbon air-cathode MFC was evaluated under different hydraulic pressures. The MFC under 100 mmH2O hydraulic pressure produced a maximum power density of 1260 ± 24 mW m(-2), while the power density decreased by 24.4% and 44.7% as the hydraulic pressure increased to 500 mmH2O and 2000 mmH2O, respectively. Notably, the performance of both the anode and the cathode had decreased under high hydraulic pressures. Electrochemical impedance spectroscopy tests of the cathode indicated that both charge transfer resistance and diffusion transfer resistance increased with the increase in hydraulic pressure. Denaturing gradient gel electrophoresis of PCR-amplified partial 16S rRNA genes demonstrated that the similarity among anodic biofilm communities under different hydraulic pressures was ≥ 90%, and the communities of all MFCs were dominated by Geobacter sp. These results suggested that the reduction in power output of the single chamber air-cathode MFC under high hydraulic pressures can be attributed to water flooding of the cathode and suppression the metabolism of anodic exoelectrogenic bacteria.

Research paper thumbnail of Impact of acclimation methods on microbial communities and performance of anaerobic fluidized bed membrane bioreactors

Environ. Sci.: Water Res. Technol., 2016

Granular activated carbon was acclimated to different substrates, and then used in an anaerobic f... more Granular activated carbon was acclimated to different substrates, and then used in an anaerobic fluidized bed membrane bioreactor (AFMBR) to treat diluted domestic wastewater. Acetate acclimation produced the best results.

Research paper thumbnail of Simultaneous nitrogen and organics removal using membrane aeration and effluent ultrafiltration in an anaerobic fluidized membrane bioreactor

Dissolved methane and a lack of nutrient removal are two concerns for treatment of wastewater usi... more Dissolved methane and a lack of nutrient removal are two concerns for treatment of wastewater using anaerobic fluidized bed membrane bioreactors (AFMBRs). Membrane aerators were integrated into an AFMBR to form an aeration membrane fluidized bed membrane bioreactor (AeMFMBR) capable of simultaneous removal of organic matter and ammonia without production of dissolved methane. Good effluent quality was obtained with no detectable suspended solids, 93±5% of chemical oxygen demand (COD) removal to 14±11mg/L, and 74±8% of total ammonia (TA) removal to 12±3mg-N/L for domestic wastewater (COD of 193±23mg/L and TA of 49±5mg-N/L) treatment. Nitrate and nitrite concentrations were always low (<1mg-N/L) during continuous flow treatment. Membrane fouling was well controlled by fluidization of the granular activated carbon (GAC) particles (transmembrane pressures maintained <3kPa). Analysis of the microbial communities suggested that nitrogen removal was due to nitrification and denitrifi...

Research paper thumbnail of Effects of hydraulic pressure on the performance of single chamber air-cathode microbial fuel cells

Biosensors and Bioelectronics, 2014

Scaling up of microbial fuel cells (MFCs) without losing power density requires a thorough unders... more Scaling up of microbial fuel cells (MFCs) without losing power density requires a thorough understanding of the effect of hydraulic pressure on MFC performance. In this work, the performance of an activated carbon air-cathode MFC was evaluated under different hydraulic pressures. The MFC under 100 mmH 2 O hydraulic pressure produced a maximum power density of 1260 724 mW m -2 , while the power density decreased by 24.4% and 44.7% as the hydraulic pressure increased to 500 mmH 2 O and 2000 mmH 2 O, respectively. Notably, the performance of both the anode and the cathode had decreased under high hydraulic pressures. Electrochemical impedance spectroscopy tests of the cathode indicated that both charge transfer resistance and diffusion transfer resistance increased with the increase in hydraulic pressure. Denaturing gradient gel electrophoresis of PCR-amplified partial 16S rRNA genes demonstrated that the similarity among anodic biofilm communities under different hydraulic pressures was Z90%, and the communities of all MFCs were dominated by Geobacter sp. These results suggested that the reduction in power output of the single chamber air-cathode MFC under high hydraulic pressures can be attributed to water flooding of the cathode and suppression the metabolism of anodic exoelectrogenic bacteria.

Research paper thumbnail of Enhancing power generation of scale-up microbial fuel cells by optimizing the leading-out terminal of anode

Journal of Power Sources, 2014

A simple model to simulate the power loss of scale up microbial fuel cell. Leading-out terminal c... more A simple model to simulate the power loss of scale up microbial fuel cell. Leading-out terminal could result in more than 47.1% of power loss. Leading-out terminal of anode is one of the key factors for scaling up MFC. a b s t r a c t Low power output and high cost are two major challenges for scaling up microbial fuel cell (MFC). The ohmic resistance of anode increasing as MFCs scale up can be one of main reasons for power density decrease. We present a simple model to simulate power loss and potential drop distribution caused by ohmic resistance of carbon mesh anodes with different dimensions and various leading-out terminals. We also conduct experiments to confirm the simulation work and the large impact of anode ohmic resistance on large-scale MFCs by varying leading-out configurations. The simulation results show that the power loss with an anode size of 1 m 2 can be as high as 4.19 W at current density of 3 A m À2 , and the power loss can be decreased to 0.04 W with optimized configuration of leading-out terminals and to 0.01 W by utilizing brass mesh as anode material. The experiments well confirm the simulation results with the deviations less than 11.0%. Furthermore, the experiment results also show that more than 47.1% of the power loss from small-scale to large-scale MFC comes from bad-leading-out terminal. These results demonstrate that leading-out terminal of anode is one of the key factors for scaling up MFC.