Investigation of novel anthracene-bridged carbazoles as sensitizers and Co-sensitizers for dye-sensitized solar cells

Summary Novel anthracene-bridged carbazole organic dyes (designated ML4 and ML5) were synthesized using the Suzuki coupling reaction. These dyes were designed to be donor-π-conjugation-acceptor sensitizers for dye-sensitized solar cells, where the carbazole moiety acts as the donor, the anthracene moiety provides the π-conjugation, and the cyano acrylic acid acts as the acceptor. Solar cells were … Read more

New process transforms wood, crop waste into valuable chemicals

MADISON, Wis. – Scientists today disclosed a new method to convert lignin, a biomass waste product, into simple chemicals. The innovation is an important step toward replacing petroleum-based fuels and chemicals with biorenewable materials, says Shannon Stahl, an expert in “green chemistry” at the University of Wisconsin-Madison.

Lignin is the substance that makes trees and cornstalks sturdy, and it accounts for nearly 30 percent of the organic carbon in the biosphere. Stahl, senior author of a new report in the journal Nature, notes that lignin is a waste product of the paper industry, where cellulose is the valuable product. “Lignin is burned as a low-value fuel, but if biofuels are to become a reality, we need to get more value from lignin,” he explains.

Lignin is a complex material containing chains of six-carbon rings. These rings, called “aromatics,” could be the basis for a sustainable supply of useful chemicals — but only if the chains of lignin can be broken down into the individual units.

“Lignin is the only large volume renewable feedstock that contains aromatics,” says Stahl.

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Energy Poverty-The Role of Sierra Leoneans in the Diaspora

“Access to energy is absolutely fundamental in the struggle against poverty,” said World Bank Vice President Rachel Kyte. “It is energy that lights the lamp that lets you do your homework that keeps the heat on in a hospital that lights the small businesses where most people work. Without energy, there is no economic growth, … Read more

Forecasting aggregated wind power production of multiple wind farms using hybrid wavelet-PSO-NNs

SUMMARY This paper describes the problem of short-term wind power production forecasting based on meteorological information. Aggregated wind power forecasts are produced for multiple wind farms using a hybrid intelligent algorithm that uses a data filtering technique based on wavelet transform (WT) and a soft computing model (SCM) based on neural network (NN), which is … Read more

Stanford study could lead to paradigm shift in organic solar cell research

Organic solar cells have long been touted as lightweight, low-cost alternatives to rigid solar panels made of silicon. Dramatic improvements in the efficiency of organic photovoltaics have been made in recent years, yet the fundamental question of how these devices convert sunlight into electricity is still hotly debated. Now a Stanford University research team is … Read more

UC’s SmartLight More Than a Bright Idea, It’s a Revolution in Interior Lighting Ready to Shine

m4s0n501 The innovative solar technology “would change the equation for energy,” according to UC researchers. A pair of University of Cincinnati researchers has seen the light – a bright, powerful light – and it just might change the future of how building interiors are brightened. In fact, that light comes directly from the sun. And … Read more

Scientists develop heat-resistant materials that could vastly improve solar cell efficiency

Scientists have created a heat-resistant thermal emitter that could significantly improve the efficiency of solar cells. The novel component is designed to convert heat from the sun into infrared light, which can than be absorbed by solar cells to make electricity – a technology known as thermophotovoltaics. Unlike earlier prototypes that fell apart at temperatures … Read more