New method turns trees into energy-storing devices

In a breakthrough, scientists have found a novel way to transform trees into high-tech energy storage devices for computers and other consumer electronics.
Scientists at Oregon State University have found that cellulose - the most abundant organic polymer on Earth and a key component of trees - can be heated in a furnace in the presence of ammonia, and turned into the building blocks for supercapacitors.
Supercapacitors are extraordinary, high-power energy devices with a wide range of industrial applications, in everything from electronics to automobiles and aviation.
But widespread use of them has been held back primarily by cost and the difficulty of producing high-quality carbon electrodes.

The new approach can produce nitrogen-doped, nanoporous carbon membranes - the electrodes of a supercapacitor - at low cost, quickly, in an environmentally benign process.
The only byproduct is methane, which could be used immediately as a fuel or for other purposes.

"The ease, speed and potential of this process is really exciting," said Xiulei (David) Ji, lead author of the study.
"For the first time we've proven that you can react cellulose with ammonia and create these N-doped nanoporous carbon membranes," Ji said.
"It's surprising that such a basic reaction was not reported before. Not only are there industrial applications, but this opens a whole new scientific area, studying reducing gas agents for carbon activation.

"We're going to take cheap wood and turn it into a valuable high-tech product," he said.
These carbon membranes at the nano-scale are extraordinarily thin - a single gramme of them can have a surface area of nearly 2,000 square meters. That's part of what makes them useful in supercapacitors.
And the new process used to do this is a single-step reaction that's fast and inexpensive. It starts with something about as simple as a cellulose filter paper.
The exposure to high heat and ammonia converts the cellulose to a nanoporous carbon material needed for supercapacitors, and should enable them to be produced, in mass, more cheaply than before.

A supercapacitor is a type of energy storage device, but it can be recharged much faster than a battery and has a great deal more power.
They are used in any type of device where rapid power storage and short, but powerful energy release is needed.
Supercapacitors can be used in computers and consumer electronics, such as the flash in a digital camera. They have applications in heavy industry, and are able to power anything from a crane to a forklift.
The research was published in the journal Nano Letters.