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Conference Paper: Regenerative microfluidic fuel cell for high efficient H2 production and utilization
Title | Regenerative microfluidic fuel cell for high efficient H2 production and utilization |
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Authors | |
Issue Date | 2013 |
Publisher | American Chemical Society (ACS). |
Citation | The 245th National Meeting and Exposition of the American Chemical Society (ACS), New Orleans, LA., 7-11 April 2013. Abstract 271 How to Cite? |
Abstract | Microfluidic fuel cell (MFC) is a novel type of fuel cell. It utilizes unique laminar-flow interface to naturally separate the fuel and oxidant streams without need of a membrane. We recently developed a new concept of regenerative microfluidic fuel cell (RMFC) to make a single cell perform dual functions: as a MFC to supply electricity and as a microfluidic electrolysis cell (MEC) to produce fuel. Here, a proof-of-concept prototype of RMFC will be presented. We leverage microfludic principles to break thermodynamic constraint on RMFC. The membraneless nature of RMFC enables individual tailoring of the composition of anolyte and catholyte without the need to consider the membrane stability subject to pH environment, thus allowing the kinetics and thermodynamics at the anode and cathode to be optimized independently and dynamically. Certain combinations of anode and cathode pH media will result in very low open circuit potentials (OCPs), while others may lead to high OCPs as a result of the pH dependence of standard electrode potentials, which will be respectively favorable for EC and FC applications. For example, both conventional alkaline and acid FC and EC achieves OCP of 1.23 V. While combining the acid O2 electrode with alkaline H2 electrode in a MEC, the OCP is lowered to 0.51 V, which thermodynamically requires 58% lower voltage to drive water splitting. Vice versa, by coupling acid H2 and alkaline O2 electrodes in a MFC, the OCP increases to 1.94 V, providing a significantly higher power output. As such, both FC and EC operation can be enhanced. Thermodynamically, the cycle efficiency for a H2 RMFC can be as high as 380%. Practically, efficiency exceeding 100% is achieved. |
Description | Conference Theme: Chemistry of Energy & Food Division - ENVR: Division of Environmental Chemistry Session - Green Chemistry Fostered Advances for Chemicals and Fuel Production: abstract 271 |
Persistent Identifier | http://hdl.handle.net/10722/185002 |
DC Field | Value | Language |
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dc.contributor.author | Xuan, J | en_US |
dc.contributor.author | Wang, H | - |
dc.contributor.author | Xu, H | - |
dc.contributor.author | Leung, MKH | - |
dc.contributor.author | Zhang, L | - |
dc.contributor.author | Leung, DYC | - |
dc.date.accessioned | 2013-07-15T10:23:18Z | - |
dc.date.available | 2013-07-15T10:23:18Z | - |
dc.date.issued | 2013 | en_US |
dc.identifier.citation | The 245th National Meeting and Exposition of the American Chemical Society (ACS), New Orleans, LA., 7-11 April 2013. Abstract 271 | en_US |
dc.identifier.uri | http://hdl.handle.net/10722/185002 | - |
dc.description | Conference Theme: Chemistry of Energy & Food | - |
dc.description | Division - ENVR: Division of Environmental Chemistry | - |
dc.description | Session - Green Chemistry Fostered Advances for Chemicals and Fuel Production: abstract 271 | - |
dc.description.abstract | Microfluidic fuel cell (MFC) is a novel type of fuel cell. It utilizes unique laminar-flow interface to naturally separate the fuel and oxidant streams without need of a membrane. We recently developed a new concept of regenerative microfluidic fuel cell (RMFC) to make a single cell perform dual functions: as a MFC to supply electricity and as a microfluidic electrolysis cell (MEC) to produce fuel. Here, a proof-of-concept prototype of RMFC will be presented. We leverage microfludic principles to break thermodynamic constraint on RMFC. The membraneless nature of RMFC enables individual tailoring of the composition of anolyte and catholyte without the need to consider the membrane stability subject to pH environment, thus allowing the kinetics and thermodynamics at the anode and cathode to be optimized independently and dynamically. Certain combinations of anode and cathode pH media will result in very low open circuit potentials (OCPs), while others may lead to high OCPs as a result of the pH dependence of standard electrode potentials, which will be respectively favorable for EC and FC applications. For example, both conventional alkaline and acid FC and EC achieves OCP of 1.23 V. While combining the acid O2 electrode with alkaline H2 electrode in a MEC, the OCP is lowered to 0.51 V, which thermodynamically requires 58% lower voltage to drive water splitting. Vice versa, by coupling acid H2 and alkaline O2 electrodes in a MFC, the OCP increases to 1.94 V, providing a significantly higher power output. As such, both FC and EC operation can be enhanced. Thermodynamically, the cycle efficiency for a H2 RMFC can be as high as 380%. Practically, efficiency exceeding 100% is achieved. | - |
dc.language | eng | en_US |
dc.publisher | American Chemical Society (ACS). | en_US |
dc.relation.ispartof | 245th ACS National Meeting & Exposition 2013 | en_US |
dc.title | Regenerative microfluidic fuel cell for high efficient H2 production and utilization | en_US |
dc.type | Conference_Paper | en_US |
dc.identifier.email | Xuan, J: jxuan@ecust.edu.cn | en_US |
dc.identifier.email | Wang, H: whzme@hku.hk | - |
dc.identifier.email | Leung, DYC: ycleung@hku.hk | - |
dc.identifier.authority | Leung, DYC=rp00149 | en_US |
dc.description.nature | link_to_OA_fulltext | - |
dc.identifier.hkuros | 215358 | en_US |
dc.publisher.place | United States | - |
dc.customcontrol.immutable | sml 131122 | - |