Water splitting with silicon p–i–n superlattices suspended in solution
Water splitting with silicon p–i–n superlattices suspended in solution
复制标题
悬浮在溶液中的硅p-i-n超晶格的水分解
DOI:
10.1038/s41586-022-05549-5
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发表时间:
2023
期刊:
影响因子:
64.8
通讯作者:
Kim, Seokhyoung
中科院分区:
文献类型:
--
作者:
Teitsworth, Taylor S.;Hill, David J.;Litvin, Samantha R.;Ritchie, Earl T.;Park, Jin-Sung;Custer, James P.;Taggart, Aaron D.;Bottum, Samuel R.;Morley, Sarah E.;Kim, Seokhyoung
Photoelectrochemical (PEC) water splitting to produce hydrogen fuel was first reported 50 years ago, yet artificial photosynthesis has not become a widespread technology. Although planar Si solar cells have become a ubiquitous electrical energy source economically competitive with fossil fuels, analogous PEC devices have not been realized, and standard Si p-type/n-type (p–n) junctions cannot be used for water splitting because the bandgap precludes the generation of the needed photovoltage. An alternative paradigm, the particle suspension reactor (PSR), forgoes the rigid design in favour of individual PEC particles suspended in solution, a potentially low-cost option compared with planar systems,. Here we report Si-based PSRs by synthesizing high-photovoltage multijunction Si nanowires (SiNWs) that are co-functionalized to catalytically split water. By encoding a p-type–intrinsic–n-type (p–i–n) superlattice within single SiNWs, tunable photovoltages exceeding 10 V were observed under 1 sun illumination. Spatioselective photoelectrodeposition of oxygen and hydrogen evolution co-catalysts enabled water splitting at infrared wavelengths up to approximately 1,050 nm, with the efficiency and spectral dependence of hydrogen generation dictated by the photonic characteristics of the sub-wavelength-diameter SiNWs. Although initial energy conversion efficiencies are low, multijunction SiNWs bring the photonic advantages of a tunable, mesoscale geometry and the material advantages of Si—including the small bandgap and economies of scale—to the PSR design, providing a new approach for water-splitting reactors.
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影响因子:
16.6
作者:
Ohiri U;Shields CW 4th;Han K;Tyler T;Velev OD;Jokerst N
通讯作者:
Jokerst N
DOI:
--
发表时间:
2019
期刊:
影响因子:
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作者:
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影响因子:
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作者:
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影响因子:
41.2
作者:
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通讯作者:
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