Artificial Photosynthesis Developed

Panasonic said on Monday it has created a new system for artificial photosynthesis that can remove carbon dioxide from the air almost as well as plants do, as part of the company’s entry into an industry-wide trend toward greener tech.

The company said its system uses nitride semiconductors, which are widely used in LEDs (light-emitting diodes) to convert light to energy, and a metal catalyst to convert carbon dioxide and water to formic acid, which is widely used in dyes, leather production and as a preservative.

Carbon dioxide is a major pollutant and considered to be a main cause of the “greenhouse effect,” which most climate scientists believe causes global warming.

Panasonic has struggled with its traditional electronics business and has made eco-friendly products and practices the key element in its turnaround plan. The company is hoping to leverage its large rechargeable battery and solar businesses, while joining the industry in embracing technologies that are friendlier to the environment. The issue is an important one with customers, as demonstrated by the the outcry earlier this month when Apple was forced to rejoin a green standards program when clients complained about its earlier withdrawal.

Panasonic said the system can convert carbon dioxide and water to formic acid with an efficiency of 0.2 percent in laboratory conditions, which is similar to the conversion rate for green plants. The efficiency refers to the portion of the incoming light energy stored in materials produced during the process.

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Spray-On Battery Coming To The Office

Researchers at Rice University in Houston have created a prototype spray-on battery that could allow engineers to rethink the way portable electronics are developed.

The rechargeable battery boasts similar electrical characteristics to the lithium ion batteries that power almost every mobile gadget, but it can be applied in layers to almost any surface with a conventional airbrush, said Neelam Singh, a Rice University graduate student who led a team working on the technology for more than a year.

Current lithium ion batteries are almost all variations on the same basic form: an inflexible block with electrodes at one end. Because they cannot easily be shaped, they sometimes restrict designers, particularly when it comes to small gadgets with curved surfaces, but the Rice prototypes could change that.

“Today, we only have a few form factors of batteries, but this battery can be fabricated to fill the space available,” said Singh.

The battery is sprayed on in five layers: two current collectors sandwich a cathode, a polymer separator and an anode.

“It was difficult optimizing the components in the form of a paint,” said Singh. Initial versions were sensitive to moisture and would peel off, but the addition of a polymer and a heat-sealing step solved this problem.

The result is a battery that can be sprayed on to plastics, metal and ceramics.

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