Cobalt-Prussian blue analogues are remarkable catalysts for the oxygen evolution reaction (water oxidation) under mild conditions such as neutral pH. Although there is extensive reports on literature about the application...
Hydrogen (H 2 ) is presented as an important alternative for clean energy and raw material in the modern world. However, the environmental benefits are linked to its process of production. Herein, the chemical aspects, advantages/disadvantages, and challenges of the main processes of H 2 production from petroleum to water are described. The fossil fuel (FF)-based methods and the state-of-art strategies are outlined to produce hydrogen from water (electrolysis), wastewater, and seawater. In addition, a discussion based on a color code to classify the cleanliness of hydrogen production is introduced. By the end, a summary of the hydrogen value chain addresses topics related to the financial aspects and perspective for 2050: green hydrogen and zero-emission carbon.
Hydrogen (H2) was one of the first molecules discovered by our society, being the most abundant element in the whole universe. Thus, H2 has gained a lot of attention throughout the years, and it has lots of applications in different areas, especially since it offers ways to decarbonize a lot of sectors, mainly the ones where it has been proved to be very difficult to meaningfully reduce those carbon emissions. Herein, the main aspects of the hydrogen economy and its main applications for energy, transportation and industries are described. These main areas outline how important is H2 for our society highlighting how H2 can make those well-known processes more sustainable and greener. By the end, a brief discussion on these applications with future perspectives is presented.
Hygroelectric cells deliver hydrogen, hydrogen peroxide,
and electric
current simultaneously at room temperature from liquid water or vapor.
Different cell arrangements allowed the electrical measurements and
the detection and measurement of the reaction products by two methods
each. Thermodynamic analysis shows that water dehydrogenation is a
non-spontaneous reaction under standard conditions, but it can occur
within an open, non-electroneutral system, thus supporting the experimental
results. That is a new example of chemical reactivity modification
in charged interfaces, analogous to the hydrogen peroxide formation
in charged aqueous aerosol droplets. Extension of the experimental
methods and the thermodynamic analysis used in this work may allow
the prediction of interesting new chemical reactions that are otherwise
unexpected. On the other hand, this adds a new facet to the complex
behavior of interfaces. Hygroelectric cells shown in this work are
built from commodity materials, using standard laboratory or industrial
processes that are easily scaled up. Thus, hygroelectricity may eventually
become a source of energy and valuable chemicals.
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