TY - JOUR
T1 - Porous and conductive SnO2 ceramics as a promising nanostructured substrate to host photocatalytic hematite coatings
T2 - Towards low cost solar-driven water splitting
AU - Bondarchuk, Alexander N.
AU - Corrales-Mendoza, Iván
AU - Aguilar-Martínez, Josué A.
AU - García-Pérez, Ulises M.
AU - Marken, Frank
N1 - Funding Information:
ANB and ICM thank the National Science and Technology Council of Mexico (CONACYT) for the support of this study (the grants # A1-S-20353 and # 280373 ).
PY - 2023/1/31
Y1 - 2023/1/31
N2 - Commercially viable generation of “green” hydrogen fuel by solar-driven water splitting requires the design of low-cost photoelectrodes and photo-devices with high photoelectrochemical performance. In this regard, conductive and easily fabricated 3D-oxide ceramics with nanosized grains and high porosity are promising as a substrate with a large surface area to host photocatalytic coatings. To test this approach, hematite photoelectrodes have been grown by metal-organic chemical vapor deposition onto free-standing SnO2-based ceramics. The photoanodes formed onto Sb2O5-SnO2, CuO-Sb2O5-SnO2, and on MoO3-Sb2O5-SnO2 substrates in aqueous 1 M NaOH under 1 sun irradiation exhibit photocurrent densities of 0.44 mA/cm2, 0.56 mA/cm2, and 0.39 mA/cm2 at 1.23 V vs. RHE, respectively. The porosity of ceramics results in the 3D growth of a thin hematite coating on ceramic grains in the substrate to a depth of ca. 3 μm. The obtained photoelectrodes are discussed based on the data of photoelectrochemical measurements, X-ray diffraction (XRD), scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDS), and Raman spectroscopy. Routes to improved performance are discussed.
AB - Commercially viable generation of “green” hydrogen fuel by solar-driven water splitting requires the design of low-cost photoelectrodes and photo-devices with high photoelectrochemical performance. In this regard, conductive and easily fabricated 3D-oxide ceramics with nanosized grains and high porosity are promising as a substrate with a large surface area to host photocatalytic coatings. To test this approach, hematite photoelectrodes have been grown by metal-organic chemical vapor deposition onto free-standing SnO2-based ceramics. The photoanodes formed onto Sb2O5-SnO2, CuO-Sb2O5-SnO2, and on MoO3-Sb2O5-SnO2 substrates in aqueous 1 M NaOH under 1 sun irradiation exhibit photocurrent densities of 0.44 mA/cm2, 0.56 mA/cm2, and 0.39 mA/cm2 at 1.23 V vs. RHE, respectively. The porosity of ceramics results in the 3D growth of a thin hematite coating on ceramic grains in the substrate to a depth of ca. 3 μm. The obtained photoelectrodes are discussed based on the data of photoelectrochemical measurements, X-ray diffraction (XRD), scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDS), and Raman spectroscopy. Routes to improved performance are discussed.
KW - Hematite
KW - Photocatalysis
KW - Solar energy
KW - Tin-dioxide ceramics
KW - Water splitting
UR - http://www.scopus.com/inward/record.url?scp=85145725560&partnerID=8YFLogxK
U2 - 10.1016/j.catcom.2022.106593
DO - 10.1016/j.catcom.2022.106593
M3 - Article
AN - SCOPUS:85145725560
VL - 174
JO - Catalysis Communications
JF - Catalysis Communications
SN - 1566-7367
M1 - 106593
ER -
