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Soleimani M, Ghasemi JB, Badiei A. Black titania; novel researches in synthesis and applications. INORG CHEM COMMUN 2022. [DOI: 10.1016/j.inoche.2021.109092] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Yang Y, Kao LC, Liu Y, Sun K, Yu H, Guo J, Liou SYH, Hoffmann MR. Cobalt-Doped Black TiO 2 Nanotube Array as a Stable Anode for Oxygen Evolution and Electrochemical Wastewater Treatment. ACS Catal 2018; 8:4278-4287. [PMID: 29755829 PMCID: PMC5939910 DOI: 10.1021/acscatal.7b04340] [Citation(s) in RCA: 67] [Impact Index Per Article: 11.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/18/2017] [Revised: 04/09/2018] [Indexed: 11/28/2022]
Abstract
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TiO2 has long been recognized as a stable and reusable
photocatalyst for water splitting and pollution control. However,
it is an inefficient anode material in the absence of photoactivation
due to its low electron conductivity. To overcome this limitation,
a series of conductive TiO2 nanotube array electrodes have
been developed. Even though nanotube arrays are effective for electrochemical
oxidation initially, deactivation is often observed within a few hours.
To overcome the problem of deactivation, we have synthesized cobalt-doped
Black-TiO2 nanotube array (Co-Black NTA) electrodes that
are stable for more than 200 h of continuous operation in a NaClO4 electrolyte at 10 mA cm–2. Using X-ray
photoelectron spectroscopy, X-ray absorption spectroscopy, electron
paramagnetic resonance spectroscopy, and DFT simulations, we are able
to show that bulk oxygen vacancies (Ov) are the primary
source of the enhanced conductivity of Co-Black. Cobalt doping both
creates and stabilizes surficial oxygen vacancies, Ov,
and thus prevents surface passivation. The Co-Black electrodes outperform
dimensionally stable IrO2 anodes (DSA) in the electrolytic
oxidation of organic-rich wastewater. Increasing the loading of Co
leads to the formation of a CoOx film
on top of Co-Black electrode. The CoOx/Co-Black composite electrode was found to have a lower OER overpotential
(352 mV) in comparison to a DSA IrO2 (434 mV) electrode
and a stability that is greater than 200 h in a 1.0 M KOH electrolyte
at a current density of 10 mA cm–2.
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Affiliation(s)
- Yang Yang
- Division of Engineering and Applied Science, Linde-Robinson Laboratory, California Institute of Technology, Pasadena, California 91125, United States
| | - Li Cheng Kao
- Department of Geosciences, National Taiwan University, P.O. Box 13-318, Taipei 106, Taiwan
| | - Yuanyue Liu
- Department of Mechanical Engineering and Texas Materials Institute, University of Texas at Austin, Austin, Texas 78712, United States
| | - Ke Sun
- Divisions of Chemistry and Chemical Engineering, California Institute of Technology, Pasadena, California 91125, United States
| | - Hongtao Yu
- School of Environmental Science and Technology, Dalian University of Technology, Dalian 116024, People’s Republic of China
| | - Jinghua Guo
- Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States
- Department of Chemistry and Biochemistry, University of California, Santa Cruz, California 95064, United States
| | - Sofia Ya Hsuan Liou
- Department of Geosciences, National Taiwan University, P.O. Box 13-318, Taipei 106, Taiwan
| | - Michael R. Hoffmann
- Division of Engineering and Applied Science, Linde-Robinson Laboratory, California Institute of Technology, Pasadena, California 91125, United States
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Scaramuzzo FA, Pozio A, Masci A, Mura F, Dell’Era A, Curulli A, Pasquali M. Efficient photocurrent generation using a combined Ni-TiO2 nanotubes anode. J APPL ELECTROCHEM 2015. [DOI: 10.1007/s10800-015-0837-9] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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