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Light Concentrator
PVs
Fluidics
Water Splitting
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2
Largeelectrolyzer
Smallelectrolyzer
Optimalelectrolyzer
Optimizing Solar-Hydrogen Production
PV Electrolysis
PVElectrolysis
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High Eciency Solar-H2
through PV design
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!mpro"ing η through PV design#Si-Hetero$unction cells
• VOC % &'' mV (or single cells
• VOC % 2)* V (or module
Single cells +-series connected module
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Simple, roust and high-eciency
• Operating point elo. /PP 0 staility
• High eciency o"er long time 1%*)234
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E"en .ith earth-aundant catalysts
/icrostructured 5ic6elElectrodes
Stale operation (or%*'' hrs
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7he roader space o( S-Hde"ices
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irst demonstration o( a planar sel(-trac6ing concentrator 189- *:o4
;agolla V et al),Self-tracking solar concentrator with an acceptance angle of 32°, Optics E
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!mpro"ement can help triggerimplementation
• =ecord eciency .ith non-preciousmaterials
• Simple, roust and scalale solution >
approaching ma
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7oday, electrolyzers are too e
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Bisrupting the electrolysis eld#memrane-less .ater-splitting
• 5o need (ore
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Economic gains (rommemraneless operation
0 0.5 1 1.5 2 2.50
20
40
60
80
100
120
Potential [V]
C u r r e n t D e n s i t y [ A / c
m 2 ]
:'3
'3
Gains in capitalcost1?4
Gains in (eedstoc6 cost
1 2I3 or ')&IJ9Kg41@ppro
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Fluidic gas separation
• Segre > Silererg Eect# Fluidic(orces control ule tra$ectory
Hashemi, /odestino, Psaltis, Ener) En") Sci), 2'*I, 8, 2''+-atent pending, 2'*I
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Separation depends on No.rates
:)& cm9s=e 0')M
ml9h
:&cm9s=e 0M)
Cathode@node
O2 H2
Hashemi et al) Ener) En") Sci), 2'*I, 8, 2''+-2
S d t h l
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Summary and technologyoutloo6
• High current densities %+'' m@9cm2
• Sa(e gas streams
• Aroad range o( electrolytes
!ncreasing throughput#
• Parallel plate
morphology• +B printing
technology
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Pro$ect accomplishmentsOutput to scientifc community and society:
•*: pulications• patent applications
• Ph)B) students
• Gloal con(erence on Solar-H2 path.ays
Awards and media presence:
• Foreign Policy /agazines *'' Leading Gloal 7hin6ersQ Prize• 2'*I Energy and En"ironmental Science =eaders @.ard Lectureship
• Aest Student Presentation @.ard (rom the OS@, Energy and the En"ironmentCongress
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@pproach to !ndustry• /id-scale and moility
sector O-grid energy storage and
(uel generation 1e)g) H2electrolyzer9(uel cell system
integrated .ith PV4
• Gas sensing On-chip microelectrolyzers (or
Name ionization detectors1F!B4
• Solar concentration
Planar concentration solutions
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Early stage applicationtate-o-the-art: Aenchtop!B systems .ith integrated
2 generator
µFID system: !ntegrated SH!5Emicroelectrolyzer .ith miniutarized in-
silico F!B
Key advantages:
• Farication cost reductions
• Lo. energy consumption
• Sa(ety impro"ements due to lo. H2 "olumes
• Easily integreted into chemical processes (or monitoring
SH!5ERs electrolysistechnology
F!B needs to ede"eloped and integrate
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SH!5E /emers
C) /oserEPFL B) PsaltisEPFL S) HaussenerEPFL T) AailatCSE/ @) AraunE/P@
E) ChinelloEPFL
S)/)H) HashemiEPFL
/) /odestinoEPFL
T)W) Schuettau( CSE/
=) 7othE/P@
B) AoraE/P@
S) 7emhurneEPFL
V) ;agollaEPFL