A Titanium-Doped SiOx Passivation Layer for Greatly Enhanced Performance of a Hematite-Based Photoelectrochemical System
Dr. Hyo-Jin Ahn
Center for Multidimensional Carbon Materials, Institute for Basic Science IBS, Ulsan, 44919 Republic of Korea
School of Energy & Chemical Engineering, Low Dimensional Carbon Materials Center, UNIST, Ulsan, 44919 Republic of Korea
Search for more papers by this authorKi-Yong Yoon
Center for Multidimensional Carbon Materials, Institute for Basic Science IBS, Ulsan, 44919 Republic of Korea
School of Energy & Chemical Engineering, Low Dimensional Carbon Materials Center, UNIST, Ulsan, 44919 Republic of Korea
Search for more papers by this authorMyung-Jun Kwak
Center for Multidimensional Carbon Materials, Institute for Basic Science IBS, Ulsan, 44919 Republic of Korea
School of Energy & Chemical Engineering, Low Dimensional Carbon Materials Center, UNIST, Ulsan, 44919 Republic of Korea
Search for more papers by this authorCorresponding Author
Prof. Ji-Hyun Jang
Center for Multidimensional Carbon Materials, Institute for Basic Science IBS, Ulsan, 44919 Republic of Korea
School of Energy & Chemical Engineering, Low Dimensional Carbon Materials Center, UNIST, Ulsan, 44919 Republic of Korea
Search for more papers by this authorDr. Hyo-Jin Ahn
Center for Multidimensional Carbon Materials, Institute for Basic Science IBS, Ulsan, 44919 Republic of Korea
School of Energy & Chemical Engineering, Low Dimensional Carbon Materials Center, UNIST, Ulsan, 44919 Republic of Korea
Search for more papers by this authorKi-Yong Yoon
Center for Multidimensional Carbon Materials, Institute for Basic Science IBS, Ulsan, 44919 Republic of Korea
School of Energy & Chemical Engineering, Low Dimensional Carbon Materials Center, UNIST, Ulsan, 44919 Republic of Korea
Search for more papers by this authorMyung-Jun Kwak
Center for Multidimensional Carbon Materials, Institute for Basic Science IBS, Ulsan, 44919 Republic of Korea
School of Energy & Chemical Engineering, Low Dimensional Carbon Materials Center, UNIST, Ulsan, 44919 Republic of Korea
Search for more papers by this authorCorresponding Author
Prof. Ji-Hyun Jang
Center for Multidimensional Carbon Materials, Institute for Basic Science IBS, Ulsan, 44919 Republic of Korea
School of Energy & Chemical Engineering, Low Dimensional Carbon Materials Center, UNIST, Ulsan, 44919 Republic of Korea
Search for more papers by this authorGraphical Abstract
A nanoporous hematite with a Ti-doped SiOx layer (Ti-(SiOx/np-Fe2O3)) has a photocurrent density of 2.44 mA cm−2 at 1.23 VRHE and 3.70 mA cm−2 at 1.50 VRHE. This is due to a synergistic effect of decreased charge recombination, the increased number of active sites, and the reduced hole-diffusion pathway from the hematite to the electrolyte.
Abstract
This study introduces an in situ fabrication of nanoporous hematite with a Ti-doped SiOx passivation layer for a high-performance water-splitting system. The nanoporous hematite with a Ti-doped SiOx layer (Ti-(SiOx/np-Fe2O3)) has a photocurrent density of 2.44 mA cm−2 at 1.23 VRHE and 3.70 mA cm−2 at 1.50 VRHE. When a cobalt phosphate co-catalyst was applied to Ti-(SiOx/np-Fe2O3), the photocurrent density reached 3.19 mA cm−2 at 1.23 VRHE with stability, which shows great potential of the use of the Ti-doped SiOx layer with a synergistic effect of decreased charge recombination, the increased number of active sites, and the reduced hole-diffusion pathway from the hematite to the electrolyte.
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