Enzymatic Biofuel Cells and Electrocatalytic Systems

Enzymatic biofuel cells harness the catalytic power of redox enzymes to convert biochemical energy into electricity under mild conditions. By immobilising enzymes at anodic and cathodic electrodes, these systems oxidise organic substrates such as glucose or lactate, while reducing oxygen or other acceptors, to generate a continuous current. Electrocatalytic systems extend this principle by integrating nanomaterials, conducting polymers and redox mediators to enhance electron transfer rates and stability. Advances in materials science have led to porous frameworks, nanostructured electrodes and hybrid designs that maximise surface area and facilitate direct wiring of enzymes to conductive supports. Recent emphasis has been placed on wearable and implantable devices, where flexibility, biocompatibility and operation in biofluids are critical. Innovations in screen-printable inks, metallic fibre networks and biofluid-activated components are driving the translation of enzymatic cells into self-powered sensors and medical implants. Despite progress, challenges remain in achieving long-term stability, high power density and scalable manufacture. Continued interdisciplinary efforts aim to address enzyme denaturation, biofouling and limited substrate supply, bringing enzymatic biofuel cells and electrocatalytic constructs closer to practical application in sustainable energy, personalised healthcare and environmental monitoring.

Research from Nature Portfolio

Recent studies have introduced hybrid biofuel cells employing metallic cotton fibres coated with glucose oxidase. Layer-by-layer assembly of gold nanoparticles and organic linkers on cotton yields highly conductive electrodes that support efficient charge transfer and achieve power densities exceeding 3 mW cm⁻². Another foundational contribution has elucidated the three-dimensional structure of a flavin adenine dinucleotide-dependent glucose dehydrogenase. High-resolution crystallography revealed the active-site architecture and substrate-binding residues, guiding protein engineering efforts to improve electron transfer kinetics and broaden substrate specificity for more reliable biosensing and energy conversion.

Enzymatic Biofuel Cells and Electrocatalytic Systems publication trend

The graph below shows the total number of articles in enzymatic biofuel cells and electrocatalytic systems across all publications each year (not limited to Nature Index journals).

Technical terms

Enzymatic biofuel cell (EBFC): A device that uses enzymes as biocatalysts to oxidise fuels and reduce oxidants, generating electrical current.

Electrocatalysis: Acceleration of electrochemical reactions at electrode surfaces by catalysts, often involving enzymes or metal nanostructures.

Direct electron transfer (DET): Electron flow directly between an enzyme’s redox centre and an electrode without external mediators.

Mediated electron transfer (MET): Electron flow facilitated by soluble or polymer-bound redox compounds that shuttle electrons between enzyme and electrode.

Redox mediator: A molecule that reversibly exchanges electrons between an enzyme active site and an electrode to enhance current output.

References

1. Screen-Printable Functional Nanomaterials for Flexible and Wearable Single-Enzyme-Based Energy-Harvesting and Self-Powered Biosensing Devices. Nano-Micro Letters (2023).
2. Biofluid‐Activated Biofuel Cells, Batteries, and Supercapacitors: A Comprehensive Review. Advanced Materials (2023).
3. Recent advances in enzymatic biofuel cells enabled by innovative materials and techniques. Exploration (2023).
4. Structural analysis of fungus-derived FAD glucose dehydrogenase. Scientific Reports (2015).
5. High-power hybrid biofuel cells using layer-by-layer assembled glucose oxidase-coated metallic cotton fibers. Nature Communications (2018).