nl6b02321_si_001.pdf (671.05 kB)
Directed Assembly of Nanoparticle Catalysts on Nanowire Photoelectrodes for Photoelectrochemical CO2 Reduction
journal contribution
posted on 2016-08-05, 19:04 authored by Qiao Kong, Dohyung Kim, Chong Liu, Yi Yu, Yude Su, Yifan Li, Peidong YangReducing carbon dioxide with a multicomponent
artificial photosynthetic system, closely mimicking nature, represents
a promising approach for energy storage. Previous works have focused
on exploiting light-harvesting semiconductor nanowires (NW) for photoelectrochemical
water splitting. With the newly developed CO2 reduction
nanoparticle (NP) catalysts, direct interfacing of these nanocatalysts
with NW light absorbers for photoelectrochemical reduction of CO2 becomes feasible. Here, we demonstrate a directed assembly
of NP catalysts on vertical NW substrates for CO2-to-CO
conversion under illumination. Guided by the one-dimensional geometry,
well-dispersed assembly of Au3Cu NPs on the surface of
Si NW arrays was achieved with facile coverage tunability. Such Au3Cu NP decorated Si NW arrays can readily serve as effective
CO2 reduction photoelectrodes, exhibiting high CO2-to-CO selectivity close to 80% at −0.20 V vs RHE with suppressed
hydrogen evolution. A reduction of 120 mV overpotential compared to
the planar (PL) counterpart was observed resulting from the optimized
spatial arrangement of NP catalysts on the high surface area NW arrays.
In addition, this system showed consistent photoelectrochemical CO2 reduction capability up to 18 h. This simple photoelectrode
assembly process will lead to further progress in artificial photosynthesis,
by allowing the combination of developments in each subfield to create
an efficient light-driven system generating carbon-based fuels.
History
Usage metrics
Categories
Keywords
surface area NW arrayslight-harvesting semiconductor nanowiresSi NW arraysRHE120 mV overpotentialPLCO 2photoelectrochemical water splittingphotoelectrode assembly processPhotoelectrochemical CO 2 ReductionCO 2 reduction photoelectrodesNW light absorbersCO 2 reduction nanoparticle3 Cu NPphotoelectrochemical CO 2 reduction capabilityNP catalysts3 Cu NPs
Licence
Exports
RefWorks
BibTeX
Ref. manager
Endnote
DataCite
NLM
DC