Binghamton's villi-shaped bacterial anode holds about 0.75 volts for 14 hours in the lab
Binghamton University researchers built a villi-inspired hydrogel anode that held about 0.75 volts for at least 14 hours with Bacillus subtilis. The team says it could eventually run low-power devices from wastewater pipelines.
The Product Desk
What happened
- The researchers kept nutrient medium flowing into the cell the whole time to hold that voltage, and they have not shown the system working inside a wastewater pipeline.
- A modified carbon-cloth cathode sits across an ion-exchange membrane from the bacteria-containing anode.
- The researchers want a single-step printing process that could make the structures easier to produce at scale.
- The findings appeared in the journal Small, from Choi and doctoral researchers Ruohan Zhang and Botian Wang.
Why it matters
- Who has to decide decision A team with sensors on a sewer line has nothing in this report to buy or schedule; the sensible move is a watch list entry until a run on real wastewater is published.
- What it limits constraint A voltage alone does not size a power source, so nobody can yet say which sensors the cell could feed or how often they could report.
- What's now possible capability If the hydrogel villi keep nutrients moving and avoid the clogging that hit porous electrodes, a three-dimensional bacterial anode becomes an option for any such cell, pipe-mounted or not.
The report from Interesting Engineering says such systems might eventually supply electricity to small sensors without requiring conventional batteries [13]. That points at whoever maintains sensors along a wastewater line and swaps their batteries on a schedule. Seokheun "Sean" Choi, a professor of electrical and computer engineering at Binghamton University, put the idea plainly [8]. "We can put this biobattery in a waste pipe, because it can easily be integrated with its surroundings," he said [12].
The villi design targets a specific failure. Flat electrodes give bacteria limited surface area, and porous ones add room but can clog as biofilms form [3]. "Porous structures can be easily clogged by biofilm formation, so we had a lot of problems with nutrient delivery, waste buildup or uneven biofilm growth," Choi said [4]. Intestinal villi offer a large surface area and keep nutrients a short distance away, and the researchers sought to reproduce those advantages in a flexible electrode [9].
The geometry borrows from the gut only in part. In the intestine, microorganisms sit mainly in a mucus layer near the villi's surface, while this design embeds the bacteria throughout the hydrogel [15]. Future work will test whether reproducing more of the intestine's physical and chemical conditions keeps the bacteria active and improves performance [16].
The report quotes a voltage and a duration. It does not include a current or power figure, so a sensor's draw cannot be checked against it. The duration is a floor of 14 hours [1], about 58 percent of one day [10].
We'd put this result on a watch list for now. Waiting could mean a late start on any pilot if the cell works out. Moving early means budgeting against a figure that has not left the lab.
Two questions sort any pipe-energy claim. The first is whether the output was measured on the fluid you actually have. The second is whether the output is reported as current over time, for long enough to cover your device's duty cycle. A claim that clears both justifies a pilot. If it clears only one, ask the lab for the missing number. This result clears neither yet.
What to watch
- A published run of the cell on real wastewater, or inside a pipeline, instead of a continuous nutrient medium.
- Current and power figures, and run times well past the 14-hour floor.
- The single-step printing process and any change to how bacteria are distributed in the hydrogel.
Clarity's read
What the record supports and how the coverage leans. The claims behind it follow.
Reality
- Evidence40
- Adoption
- Not scored
- Hype gap+15
- Incentives
- Not scored
- Confidence55
Claim ledger
Ranked by verification strength, evidence, and original report placement.
- [1]
Researchers at Binghamton University developed a bacteria-powered battery inspired by the human small intestine that maintained an output of about 0.75 volts for at least 14 hours during testing.
- [2]
The team fabricated finger-like structures from a flexible polymer hydrogel and embedded Bacillus subtilis within them; the structures serve as the battery's anode.
- [3]
Conventional two-dimensional electrodes provide limited surface area for bacterial growth, and porous materials offer more space but can become clogged as bacteria form biofilms, restricting the movement of nutrients and waste.
- [4]
"Porous structures can be easily clogged by biofilm formation, so we had a lot of problems with nutrient delivery, waste buildup or uneven biofilm growth," said Seokheun "Sean" Choi.
- [5]
The bacteria-containing structures form the anode, while a modified carbon-cloth cathode sits on the opposite side of an ion-exchange membrane.
- [6]
The reported voltage was maintained with a continuous supply of nutrient medium, and the team has not demonstrated the system operating inside a wastewater pipeline.
- [7]
The findings were published in the journal Small.
- [8]
Seokheun "Sean" Choi is a professor of electrical and computer engineering at Binghamton University; he worked with doctoral researchers Ruohan Zhang and Botian Wang.
- [9]
Intestinal villi provide a large surface area while allowing nutrients to move across relatively short distances, and the researchers sought to reproduce these advantages in a flexible battery electrode.
- [10]
A 14-hour run is about 58 percent of a 24-hour day.
- [11]
The team says the technology could eventually be installed in wastewater pipelines, using organic waste as a nutrient source to generate electricity for low-power devices.
- [12]
"We can put this biobattery in a waste pipe, because it can easily be integrated with its surroundings," Choi said.
- [13]
Such systems might eventually supply electricity to small sensors without requiring conventional batteries.
- [14]
The researchers want to simplify manufacturing through a single-step printing process that could make the structures easier to produce at scale.
- [15]
In the human intestine, microorganisms are concentrated mainly in a mucus layer near the villi's surface, while the current design embeds bacteria throughout the hydrogel.
- [16]
Future work will examine whether reproducing more of the intestine's physical and chemical conditions can help maintain bacterial activity and improve performance.
Get this ledger inside ChatGPT. Ask about any of our stories and the answer brings its figure, each claim’s verdict and the sources. Free, no account.
Sources
1 independent publisher whose own reporting we read for this story.
- interestingengineering.comHuman gut-inspired biobattery delivers 0.75 volts for 14 hours in US lab tests
1 article · October 15, 2026
Topics and entities
Follow any of these and your For You feed starts watching them — no settings page required.
Entities
- Bacillus subtilisFollow
- Seokheun "Sean" ChoiFollow
- SmallFollow
- Binghamton UniversityFollow