Related Experiment Video
Updated: Jan 10, 2026
05:29
Self-standing Electrochemical Set-up to Enrich Anode-respiring Bacteria On-site
Published on: July 24, 2018
8.1K
Entropy-Engineered HEO/Fe, N-CNT Bioanode via Flash Joule Heating: Accelerated Electron Harvesting and Directed
Zheng Zhang1, Yunfeng Qiu2, Yuhang Wang2
1Key Laboratory of Bio-Based Material Science & Technology, Ministry of Education, Material Science and Engineering College, Northeast Forestry University, Harbin, 150001, China.
Small (Weinheim an Der Bergstrasse, Germany)
|November 29, 2025
Summary
Entropy-engineered bioanodes using flash Joule heating significantly boost microbial fuel cell performance. This novel approach enhances extracellular electron transfer (EET) for improved sustainable energy harvesting.
Area of Science:
- Bioelectrochemical Systems
- Materials Science
- Nanotechnology
Background:
- Extracellular electron transfer (EET) is crucial for microbial fuel cells (MFCs) but is often limited at the microbe-anode interface.
- High-entropy oxides (HEOs) can enhance anode kinetics, yet traditional synthesis methods hinder interfacial integration and understanding of entropy-driven EET.
- Developing advanced anode materials is key to overcoming bottlenecks in MFC performance.
Purpose of the Study:
- To engineer a novel bioanode using entropy modulation for enhanced EET in MFCs.
- To investigate the mechanisms of entropy-driven EET facilitated by HEOs anchored on carbon nanotubes.
- To achieve record power density and efficiency in MFCs through advanced anode design.
Main Methods:
- Fabrication of an entropy-engineered bioanode using ultrafast flash Joule heating (FJH).
- Anchoring high-entropy oxide (HEO) nanoparticles (Fe─Co─Ni─Cr─Mn─O) onto vertically aligned Fe, N-doped carbon nanotubes (CNTs) on carbon cloth.
- Characterization using DFT calculations to analyze electronic band structures and adsorption energies.
- Microbial analysis to assess biofilm abundance and metabolite secretion.
Main Results:
- Achieved a record power density of 3.76 W m-2, outperforming state-of-the-art HEO anodes by 9.6%.
- Demonstrated uniform anchoring of HEO nanoparticles on Fe, N-CNTs/CC, synergizing conductivity and pseudocapacitance.
- DFT calculations revealed entropy-broadened conduction bands and reduced electron tunneling distance (2.47 Å).
- Promoted significant enrichment of *Geobacter* (71% biofilm abundance) and riboflavin secretion, enhancing EET pathways.
Conclusions:
- Entropy modulation via FJH is a universal strategy for high-performance bioelectrochemical systems.
- The engineered bioanode significantly enhances direct and mediated EET pathways for sustainable energy harvesting.
- This work opens new avenues for developing efficient MFCs for energy and environmental applications.
Related Concept Videos
03:12Batteries and Fuel Cells
30.7K
A battery is a galvanic cell that is used as a source of electrical power for specific applications. Modern batteries exist in a multitude of forms to accommodate various applications, from tiny button batteries such as those that power wristwatches to the very large batteries used to supply backup energy to municipal power grids. Some batteries are designed for single-use applications and cannot be recharged (primary cells), while others are based on conveniently reversible cell reactions that...
30.7K
01:15Metabolism of Chemolithotrophs
728
Chemolithotrophs are microorganisms that obtain energy by oxidizing inorganic molecules such as hydrogen gas (H₂), ammonia (NH₃), reduced sulfur compounds (H₂S, S²⁻), and ferrous iron (Fe²⁺). Unlike heterotrophic organisms that rely on organic carbon, chemolithotrophs transfer electrons from these inorganic donors to the electron transport chain (ETC), generating a proton motive force (PMF) that drives ATP synthesis through oxidative phosphorylation.
728