000266773 001__ 266773
000266773 005__ 20190819100830.0
000266773 022__ $$a2050-7488
000266773 022__ $$a2050-7496
000266773 0247_ $$a10.1039/c8ta12295d$$2doi
000266773 02470 $$2isi$$a000463970400009
000266773 037__ $$aARTICLE
000266773 245__ $$aAn ultrathin cobalt-iron oxide catalyst for water oxidation on nanostructured hematite photoanodes
000266773 269__ $$a2019-03-21
000266773 260__ $$c2019-03-21
000266773 336__ $$aJournal Articles
000266773 520__ $$aThe harvesting of sunlight by a photoelectrochemical (PEC) cell to split water into hydrogen and oxygen is an attractive strategy to store solar energy in the form of chemical bonds. The oxygen evolution reaction (OER) remains a bottleneck for the development of efficient PEC devices. Here we report a photoelectrochemical method to homogeneously deposit a cobalt-iron oxide (CoFeOx) catalyst on a nanostructured hematite photoanode. An ultrathin catalyst layer (<1 nm) yielded a 200 mV cathodic shift of onset potential and a photocurrent density of 1.6 and 2.5 mA cm(-2) at 1.0 V and 1.23 vs. RHE in 1 M KOH, respectively. We investigated the enhancement of photoactivity induced by the addition of the CoFeOx layer by impedance spectroscopy, photoluminescence, and by using H2O2 as a hole scavenger. This work points to the effective utilization of subnanometric coatings as efficient catalyst overlayers to enhance the OER activity of photoanodes.
000266773 650__ $$aChemistry, Physical
000266773 650__ $$aEnergy & Fuels
000266773 650__ $$aMaterials Science, Multidisciplinary
000266773 650__ $$aChemistry
000266773 650__ $$aEnergy & Fuels
000266773 650__ $$aMaterials Science
000266773 6531_ $$aoxygen evolution
000266773 6531_ $$aphotoelectrochemical performance
000266773 6531_ $$asurface modification
000266773 6531_ $$asolar
000266773 6531_ $$akinetics
000266773 700__ $$aLiardet, Laurent$$0249251$$g203234
000266773 700__ $$aKatz, Jordan E.
000266773 700__ $$aLuo, Jingshan$$0248275$$g243753
000266773 700__ $$aGratzel, Michael$$0240191$$g105292
000266773 700__ $$aHu, Xile$$0242979$$g181278
000266773 773__ $$q6012-6020$$k11$$j7$$tJournal Of Materials Chemistry A
000266773 8560_ $$fxile.hu@epfl.ch
000266773 8564_ $$s1041799$$uhttps://infoscience.epfl.ch/record/266773/files/Main%20text.pdf$$zPOSTPRINT
000266773 8564_ $$zFinal$$s2722215$$uhttps://infoscience.epfl.ch/record/266773/files/SI.pdf
000266773 909C0 $$0252113$$pLSCI$$mxile.hu@epfl.ch$$zBorel, Alain$$xU11810$$yApproved
000266773 909C0 $$yApproved$$pLPI$$xU10101$$mheidi.francelet@epfl.ch$$zBorel, Alain$$0252060
000266773 909CO $$pSB$$particle$$ooai:infoscience.epfl.ch:266773
000266773 961__ $$apierre.devaud@epfl.ch
000266773 973__ $$rREVIEWED$$sPUBLISHED$$aEPFL
000266773 981__ $$aoverwrite
000266773 980__ $$aARTICLE