Certain materials, generally metal oxides, can sustain the unassisted photo-electrolysis of water into H2 and O2. The energy contained in the photons that are absorbed by these materials can in many cases be efficiently converted into energy stored into the chemical fuels produced by the photo-electrolysis system. However, these materials have optical absorption thresholds (band gaps) that are too large to permit effective absorption of the visible and infrared portions of the solar spectrum, thereby wasting a large fraction of the incident solar energy and yielding overall energy conversion efficiencies of o 1%. Modification of metal oxide materials has been claimed to be much more promising, with a modified TiO 2 photo-anode yielding 8% efficiency in the photo-assisted splitting of water into H2 and O2 . (more…)
Several molecular systems have been constructed that mimic various aspects of photosynthesis. Two of these utilize molecular system ...
The basic processes that occur in such a system are well understood. The semiconductor electrode efficiently absorbs light, produci ...
The issues of hydrogen storage run through the hydrogen production, hydrogen transport, supply and demand for end use of hydrog ...
Hydrogen has many applications when it comes to fuel. It can be used both in internal combustion engines and hydrogen fuel cells. ...
All of today’s hydrogen conversion products, demonstration models, and prototypes possess some deficiencies; they cannot yet pr ...
Indoor air quality (IAQ) research deals with the presence, levels, health effects, and control of physical, chemical, and biological factors in indoor environments, including homes, workplaces, and vehicles. IAQ research in industrialized countries has examined hundreds of specific factors (e.g., temperature, various chemicals, and mold), sources of pollution environment (e.g., environmental tobacco smoke, occupational factors, consumer cleaning products, and moisture), and control technologies (e.g., ventilation). (more…)
Important research over the past few decades has illustrated that indoor air pollution and indoor smoke from solid fuel poses i ...
In terms of aggregate health effects, household solid fuel use is currently the most important source of indoor air pollution i ...
Exposure to air pollutants and air pollution problem are very high in indoor environments in developing countries. Smith has es ...
Reducing exposure to indoor air pollution from household energy use can be achieved through interventions in of the following a ...
Exposure to indoor air pollution from the combustion of solid fuels has been implicated, with varying degrees of evidence, as a ...
From prehistory until the Industrial Revolution, most energy sources used by humans were localized (i.e., available within 5–10 miles of end users). Energy sources included draft animals, human slaves, and renewable sources such as biomass (wood and wastes), water mills, and wind power. Following the onset of the Industrial Revolution, with advancements in transportation technology and increased rates of deforestation in many regions, societies increasingly relied on long-distance shipments of coal, wood, and eventually oil, natural gas, and electric power. (more…)
Transportation is another sector that has increased its relative share of primary energy use. This sector has serious concerns ...
The global dependence on fossil fuels developed during the Industrial Revolution, two centuries of economic and social development ...
Natural gas and oil are common source energy used to give electricity. How efficient is coal if we compare to these other source of ...
Statistics on national production levels and indicators of environmental pressure have been collected during the past few decad ...
The entire concept of energy independence revolves around using the resources within a country. Simply put, it's "Stay within ...
The energy that people use every day comes from many different sources. The resources are divided into two main groups: renewable energy and nonrenewable energy. Renewable energy sources are those that can be used again and again. Renewable energy resources have unlimited supply. (more…)
In Europe, modern renewable energy sources technologies were explored thoroughly for the first time after the oil embargo/ price cr ...
During the US Presidential Election 2008 Campaign, the renewable portfolio standard was one of the main agendas for Presidentia ...
The broad range of home solar energy systems are mostly known as Photovoltaic Systems (PV) or Thin Film Solar Technology. The s ...
The hydrogen can come from various sources including fossil fuels, wind, solar, biomass, nuclear, solar thermo-chemical reactio ...
Renewable energy sources cannot run out and causes so little damage to the environment that its use does not need to be restric ...
The age of industrialization came into full force through the modern exploration and use of fossil fuels. As one of its most striking phenomena, the rapid expansion of cities throughout the late 19th and the 20th centuries was a direct outcome of the fossil fuel energy economy as well. (more…)
The aim is to work with cities in advancing renewable energy technologies and systems and to help promote the renewable energy indu ...
The Solar City approach originally emerged from a new generation of International Energy Agency (IEA) energy research and developme ...
In the absence of useful and established patterns of practice, a search is under way for new means of reconciling local government’ ...
As a reaction to these historical perspectives, the building industry has witnessed a certain rise in design responses to regio ...
Climate change caused by the enhanced greenhouse effect is one of the most significant global environmental issues. Increased emiss ...
With popularity of clean energy, the reduction of carbon and the movement toward earth friendliness, it seems that investment in alternative energy fund would be virtually no risk. But like any new industry, there is no guarantee that all sectors of the market will be successful. Since the technology bubble, which began in the early and mid 90s the market for alternative energy will soon separate winners from losers. If you are lucky or wise enough to choose an achiever, you soon will be getting great gain in your investment. On the other hand, losses are for those who have taken up the approximation that was not well received by the substantial market. (more…)
The increase in the prices of major fuels, like gasoline and diesel fuel products is a major global problems recently. Those pr ...
In this article, the terms clean energy is being used to take on a broad definition of the issue of new energy. Other possibili ...
Because transportation is such a large contributor to global warming, both globally and in the United States, climate and energy ex ...
Various provisions in the federal income tax treat energy producers more or less favorably than other businesses. By changing t ...
There are many possible reasons for suspecting market failure in a product like gasoline. Throughout the world, the exploration ...
The increase in the prices of major fuels, like gasoline and diesel fuel products is a major global problems recently. Those prices are increase associated with the global economic crisis. Now, it is the ideal time to move all the focus and effort to alternative fuels for vehicles. There are different types of alternative energy sources for fuel to choose from. But the hard fact is that the areas of alternative fuels have not passed many real qualitative and quantitative surveys and breakthrough research. (more…)
Gasoline is used mainly by cars, motorcycles, and light trucks; diesel is used mainly by heavier trucks, buses, and trains. Togethe ...
Because transportation is such a large contributor to global warming, both globally and in the United States, climate and energy ex ...
The demand for alternative fuels to substitute current fossil fuels is increasing more that ever. This is because the less avai ...
There are different types of vehicle propulsion systems and the transportation fuels that have been studied for their potential ...
Most alternative fuel vehicles on the road today were originally designed for gasoline, but converted for use with an alternative f ...
World energy use has increased steadily over the past several decades. Much of the growth in world energy consumption has been concentrated on the use of fossil fuels (oil, natural gas, and coal). This trend is expected to continue over the foreseeable future. Industrially mature nations will continue to rely on fossil fuels to meet their energy needs for all end uses, but the greatest rate of energy use is projected to occur in the emerging economies of the developing world. (more…)
Global energy consumption in the last half century has increased very rapidly and is expected to continue to grow over the next ...
There are various and somewhat complementary reasons to foster the growth of renewable energy sources in Europe. A major incent ...
Following the recent completion of three nuclear power plants, there is now some 9.6 GW of nuclear capacity in the United Kingd ...
The relationship of gross national product per capita to energy consumption per capita for most countries of the world correlat ...
Geographers researching the development of nuclear power have shifted emphasis from commercialization, cost, risk, public acceptanc ...