This is an artistic rendering of a carbonized fungal biomass-manganese oxide mineral composite (MycMnOx/C) that can be applied as a novel electrochemical material in energy storage devices. Image: Qianwei Li and Geoffrey Michael Gadd.In a new paper in Current Biology, researchers from the UK and China suggest that a red bread mold could be the key to producing more sustainable electrochemical materials for use in rechargeable batteries. The researchers show for the first time that the fungus Neurospora crassa can transform manganese into a mineral composite with favorable electrochemical properties.
"We have made electrochemically active materials using a fungal manganese biomineralization process," says Geoffrey Gadd from the University of Dundee. "The electrochemical properties of the carbonized fungal biomass-mineral composite were tested in a supercapacitor and a lithium-ion battery, and it [the composite] was found to have excellent electrochemical properties. This system therefore suggests a novel biotechnological method for the preparation of sustainable electrochemical materials."
Gadd and his colleagues have long studied the ability of fungi to transform metals and minerals in useful and surprising ways. In earlier studies, for example, the researchers showed that fungi could stabilize toxic lead and uranium. That led the researchers to wonder whether fungi could also offer a useful alternative strategy for the preparation of novel electrochemical materials.
"We had the idea that the decomposition of such biomineralized carbonates into oxides might provide a novel source of metal oxides that have significant electrochemical properties," Gadd explains.
In fact, there have been many efforts to improve the performance of lithium-ion batteries and supercapacitors using alternative electrode materials such as carbon nanotubes and other manganese oxides. But few had considered a role for fungi in the manufacturing process.
In the new study, Gadd and his colleagues incubated N. crassa in media amended with urea and manganese chloride (MnCl2) and watched what happened. They found that the long branching fungal filaments (or hyphae) became biomineralized and/or enveloped by minerals in various formations. After heat treatment, they were left with a mixture of carbonized biomass and manganese oxides (MycMnOx/C). Further study of this composite showed that it possessed ideal electrochemical properties for use in supercapacitors or lithium-ion batteries.
"We were surprised that the prepared biomass-Mn oxide composite performed so well," Gadd admits. In comparison to other reported manganese oxides in lithium-ion batteries, the carbonized fungal biomass-mineral composite "showed an excellent cycling stability and more than 90% capacity was retained after 200 cycles," he says.
This new study is the first to demonstrate the synthesis of active electrode materials using a fungal biomineralization process, illustrating the great potential of these fungal processes as a source of useful biomaterials. Gadd says they'll continue to explore the use of fungi in producing various potentially useful metal carbonates. They're also interested in investigating these processes for the biorecovery of valuable or scarce metal elements in other chemical forms.
This story is adapted from material from the University of Dundee, with editorial changes made by Materials Today. The views expressed in this article do not necessarily represent those of Elsevier. Link to original source.