Benthic Microbial Fuel Cell Reverse Charging for Energy Storage
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The power output of benthic microbial fuel cells (BMFCs) is limited by the rate of mass transport of organic matter to the anode, which depends on sediment composition and interfacial surface area, necessitating a high surface area anode for improved power generation.
Innovation Solution
A BMFC operates in a reverse mode by applying a reverse voltage greater than the open circuit cell voltage to store energy, allowing the anode biofilm to accumulate electrons potentially in the form of energy storage compounds, supplementing power output during normal discharging mode.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the anode surface area is increased to improve mass transport of organic matter, then power generation is improved, but device complexity and manufacturing difficulty increase
Solution Approach 1:
The patent employs a porous anode structure that provides high surface area for microbial attachment and organic matter access without requiring complex external geometry. The porous architecture naturally increases the electrode-sediment interfacial surface area, enabling improved mass transport and power generation while maintaining manufacturing feasibility through standardized porous material fabrication processes.
2Quantity of substance
If reverse voltage is applied to store energy in the BMFC, then energy delivery during discharge is increased, but energy input and system complexity increase
Solution Approach 1:
The BMFC system utilizes its own operational byproducts and natural environmental resources to enable energy storage. The reverse voltage charging process leverages the electrochemical potential difference already present in the system, and the stored energy is captured in the form of chemical potential in the electrode materials and microbial communities, allowing the system to serve its own energy storage needs without requiring entirely separate storage infrastructure.
3Quantity of substance
If reverse voltage greater than open circuit cell voltage is applied to charge the BMFC, then energy is stored in the anode biofilm, but operating conditions and control complexity increase
Solution Approach 1:
The system incorporates monitoring and control mechanisms that track the charging state of the BMFC and adjust the reverse voltage application accordingly. By implementing feedback control, the system can determine when sufficient energy has been stored in the anode biofilm and automatically adjust or terminate the charging process, simplifying operation while ensuring optimal energy storage without excessive complexity.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach enables a 2-fold increase in energy delivery during discharge cycles when energy is stored during charging, reducing the need for batteries and enhancing the operational efficiency of BMFCs.
Implementation Method 1
a power source operably connected to the leads and configured to apply a voltage causing electrons to flow from the cathode to the anode, thereby resulting in the storage of energy associated with the BMFC
Implementation Method 2
Bacterial biofilms that spontaneously form on the electrode surfaces catalyze the oxidation reaction occurring at the anode and the reduction reaction occurring at the cathode
Implementation Method 3
the reduction reaction occurring at the cathode... the necessary balance of charge is facilitated by a concomitant flow of protons from the anode through the sediment and water to the cathode, where the protons are generated as a byproduct of the bacterial-catalyzed oxidation of organic matter and consumed by the bacterial-catalyzed reduction of oxygen
Implementation Method 4
Electrical power is generated by oxidizing organic matter (fuel) residing in the sediment at the buried anode and reducing oxygen at the cathode in the overlying water
Implementation Method 5
A BMFC has two primary components: a non-corrosive anode and cathode... Electrical current flows from the anode through the external circuit to the cathode
Implementation Method 6
The necessary balance of charge is facilitated by a concomitant flow of protons from the anode through the sediment and water to the cathode
Data Source
AI summary
A benthic microbial fuel cell device (BMFC), namely an anode in contact with organic matter on the seafloor and a cathode in contact with overlying seawater, creates a closed path through which electric current can flow. In a conventional such device, it is used solely as a power source. However the application of a reverse voltage (for example, via solar power) results in storage of energy associated with the BMFC.