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Nanostructured photoelectrochemical solar cell for nitrogen reduction using plasmon-enhanced black silicon
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Nanostructured photoelectrochemical solar cell for nitrogen reduction using plasmon-enhanced black silicon
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Journal Article
Nanostructured photoelectrochemical solar cell for nitrogen reduction using plasmon-enhanced black silicon
2016
Overview
Ammonia (NH
3
) is one of the most widely produced chemicals worldwide. It has application in the production of many important chemicals, particularly fertilizers. It is also, potentially, an important energy storage intermediate and clean energy carrier. Ammonia production, however, mostly uses fossil fuels and currently accounts for more than 1.6% of global CO
2
emissions (0.57 Gt in 2015). Here we describe a solar-driven nanostructured photoelectrochemical cell based on plasmon-enhanced black silicon for the conversion of atmospheric N
2
to ammonia producing yields of 13.3 mg m
−2
h
−1
under 2 suns illumination. The yield increases with pressure; the highest observed in this work was 60 mg m
−2
h
−1
at 7 atm. In the presence of sulfite as a reactant, the process also offers a direct solar energy route to ammonium sulfate, a fertilizer of economic importance. Although the yields are currently not sufficient for practical application, there is much scope for improvement in the active materials in this cell.
In nature, nitrogen fixation is achieved via light-dependent nitrogenases, but industrial photochemical conversion of nitrogen into ammonia has so far proven inefficient. Here, the authors describe a nanostructured black silicon photoelectrochemical cell that can catalyse the process using solar energy.
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