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Autogenic electrolysis of water powered by solar and mechanical energy

Hu, Ya (author)
Uppsala universitet,Fasta tillståndets elektronik,Wuhan Univ Sci & Technol, Key Lab Hubei Prov Coal Convers & New Carbon Mat, Sch Chem & Chem Engn, Wuhan 430081, Peoples R China
Chen, Libo (author)
Uppsala universitet,Fasta tillståndets elektronik
Chai, Zhigang (author)
Uppsala universitet,Institutionen för kemi - Ångström
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Zhu, Jiefang (author)
Uppsala universitet,Strukturkemi
Wang, Zhong Lin (author)
Uppsala universitet,Fasta tillståndets elektronik,Chinese Acad Sci, Beijing Inst Nanoenergy & Nanosyst, Beijing Key Lab Micronano Energy & Sensor, CAS Ctr Excellence Nanosci, Beijing 101400, Peoples R China; Georgia Inst Technol, Sch Mat Sci & Engn, Atlanta, GA 30332 USA
Zhang, Shi-Li (author)
Uppsala universitet,Fasta tillståndets elektronik
Zhang, Zhi-Bin (author)
Uppsala universitet,Fasta tillståndets elektronik
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 (creator_code:org_t)
Elsevier, 2022
2022
English.
In: Nano Energy. - : Elsevier. - 2211-2855 .- 2211-3282. ; 91
  • Journal article (peer-reviewed)
Abstract Subject headings
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  • A dual-bandgap photoelectrochemical (PEC) cell with two semiconductors stacked in tandem is a widely adopted concept to capture a large fraction of the solar spectrum for water splitting. While two photons are theoretically needed to produce one H2 molecule using single-bandgap PEC cells, four photons are generally required for one H2 molecule in the dual-bandgap cells because of an unavoidable charge recombination at the solid-solid interface. Here, triboelectric effects are exploited in the form of triboelectric nanogenerator (TENG) to allow for the generation of one H2 molecule at the expenses of two photons in a dual-bandgap device using an array of core/shell p-type silicon/anatase-TiO2 nanowires as photoelectrode. The TENG, that converts mechanical energy to electricity, efficiently suppresses the charge recombination at the interface and significantly increases the energy of the photo-generated carriers required for the simultaneous water reduction and oxidation. The synergy of photoexcitation and triboelectrics results in a rate of hydrogen production in a neutral Na2SO4 electrolyte around 150 times higher than that of the counterpart, i.e., the device in the absence of TENG. Furthermore, the TENG-induced enhancement in the PEC water splitting remains substantial even when the solar power density is reduced to 20 mW/cm2.

Subject headings

NATURVETENSKAP  -- Kemi -- Fysikalisk kemi (hsv//swe)
NATURAL SCIENCES  -- Chemical Sciences -- Physical Chemistry (hsv//eng)
NATURVETENSKAP  -- Fysik -- Annan fysik (hsv//swe)
NATURAL SCIENCES  -- Physical Sciences -- Other Physics Topics (hsv//eng)

Keyword

Photoelectrochemical cells
TENG
Water splitting
Nanowires
Hydrogen

Publication and Content Type

ref (subject category)
art (subject category)

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