电位对α-Fe2O3和掺钛α-Fe2O3光氧化水电荷转移速率常数的影响

doi:10.3866/PKU.WHXB201306261

Abstract

Abstract:

It has been reported that applying a certain external anodic potential over un-doped (α-Fe₂O₃) and Ti-doped α-Fe₂O₃ (Ti-Fe₂O₃) electrodes can improve the photocurrent or the photoelectrochemical oxidation rate of water. However, it is assumed in the literature that the potential drops completely across the side of the solid semiconductor (band edge pinning), and the influence of the potential on the interfacial charge-transfer rate constant is rarely reported. In this article, the impact of the applied potential on the interfacial charge-transfer rate constant during photoelectrochemical oxidation of water over the two electrodes was investigated by electrochemical impedance spectroscopy. The results showed that by increasing the applied anodic potential, the interfacial charge-transfer rate constants for both electrodes were increased. The smaller increase in the magnitude of the rate constant than determined by theory indicates that not all of the applied potential drops across the Helmholtz layer, but takes place in both the space charge and Helmholtz layers simultaneously (Fermi level pinning). The results of the surface-state capacitance measurements suggested that the photo-generated charge can be accumulated in the surface states, resulting in the re-distribution of the potential at the interface and an improvement in the rate constant. Under the same applied potential, the higher the light intensity is, the more the photogenerated holes accumulated in the surface states. This causes an increase in the potential drop across the Helmholtz layer and consequently increases the charge-transfer rate constant. Compared with the α-Fe₂O₃, the improvement of the charge-transfer rate constant by the anodic potential is more obvious.

Key words: α-Fe₂O₃, Ti-doped α-Fe₂O₃, Photoelectrochemical oxidation of water, Potential distribution, Electrochemical impedance spectroscopy, Photoelectrochemistry

SHANGGUAN Peng-Peng, TONG Shao-Ping, LI Hai-Li, LENG Wen-Hua. Influence of the Potential on the Charge-Transfer Rate Constant of Photooxidation of Water over α-Fe₂O₃ and Ti-Doped α-Fe₂O₃[J]. Acta Phys. -Chim. Sin. 2013, 29(09), 1954-1960. doi: 10.3866/PKU.WHXB201306261

References

(1) Fujishima, A.; Honda, K. Nature 1972, 238, 37. doi: 10.1038/238037a0
(2) Esswein, M. J.; Nocera, D. G. Chem. Rev. 2007, 107, 4022. doi: 10.1021/cr050193e
(3) Walter, M. G.; Warren, E. L.; McKone, J. R.; Boettcher, S. W.;Mi, Q.; Santori, E. A.; Lewis, N. S. Chem. Rev. 2010, 110, 6446.doi: 10.1021/cr1002326
(4) Zou, Z.; Ye, J.; Sayama, K.; Arakawa, H. Nature 2001, 414,625. doi: 10.1038/414625a
(5) Abe, R.; Higashi, M.; Domen, K. J. Am. Chem. Soc. 2010, 132,11828. doi: 10.1021/ja1016552
(6) Jin, T.; Xu, D.; Diao, P.; Xiang, M. Acta Phys. -Chim. Sin. 2012,28, 2276. [金涛,许頔,刁鹏,项民.物理化学学报,2012, 28, 2276.] doi: 10.3866/PKU.WHXB201209101
(7) Du, W. P.; Li, Z.; Leng, W. H.; Xu, Y. M. Acta Phys. -Chim. Sin.2009, 25, 1530. [杜卫平,李臻,冷文华, 许宜铭.物理化学学报, 2009, 25, 1530.] doi: 10.3866/PKU.WHXB20090736
(8) Glasscock, J. A.; Barnes, P. R. F.; Plumb, I. C.; Savvides, N.J. Phys. Chem. C 2007, 111, 16477. doi: 10.1021/jp074556l
(9) Kay, A.; Cesar, I.; Grätzel, M. J. Am. Chem. Soc. 2006, 128,15714. doi: 10.1021/ja064380l
(10) Klahr, B.; Gimenez, S.; Fabregat-Santiago, F.; Bisquert, J.;Hamann, T. W. J. Am. Chem. Soc. 2012, 134, 16693. doi: 10.1021/ja306427f
(11) Barroso, M.; Cowan, A. J.; Pendlebury, S. R.; Grätzel, M.; Klug,D. R.; Durrant, J. R. J. Am. Chem. Soc. 2011, 133, 14868. doi: 10.1021/ja205325v
(12) Hamann, T. W. Dalton Trans. 2012, 41, 7830. doi: 10.1039/c2dt30340j
(13) Wang, G.; Ling, Y.;Wheeler, D. A.; George, K. E. N.; Horsley,K.; Heske, C.; Zhang, J. Z.; Li, Y. Nano Lett. 2011, 11, 3503.doi: 10.1021/nl202316j
(14) Kleiman-Shwarsctein, A.; Hu, Y. S.; Forman, A. J.; Stucky, G.D.; McFarland, E. W. J. Phys. Chem. C 2008, 112, 15900. doi: 10.1021/jp803775j
(15) Liu, Y.; Yu, Y. X.; Zhang, W. D. Electrochim. Acta 2012, 59,121. doi: 10.1016/j.electacta.2011.10.051
(16) Hu, Y. S.; Kleiman-Shwarsctein, A.; Stucky, G. D.; McFarland,E. W. Chem. Commun. 2009, 2652.
(17) Le Formal, F.; Tetreault, N.; Cornuz, M.; Moehl, T.; Grätzel, M.;Sivula, K. Chem. Sci. 2011, 2, 737. doi: 10.1039/c0sc00578a
(18) Zhang, M.; Luo, W.; Zhang, N.; Li, Z.; Yu, T.; Zou, Z.Electrochem. Commun. 2012, 23, 41. doi: 10.1016/j.elecom.2012.06.040
(19) Kim, J. Y.; Jang, J. W.; Youn, D. H.; Kim, J. Y.; Kim, E. S.; Lee,J. S. RSC Adv. 2012, 2, 9415. doi: 10.1039/c2ra21169f
(20) Upul-Wijayantha, K. G.; Saremi-Yarahmadi, S.; Peter, L. M.Phys. Chem. Chem. Phys. 2011, 13, 5264. doi: 10.1039/c0cp02408b
(21) Leng, W. H.; Zhang, Z.; Zhang, J. Q.; Cao, C. N. J. Phys. Chem. B 2005, 109, 15008. doi: 10.1021/jp051821z
(22) Cheng, X. F.; Leng, W. H.; Liu, D. P.; Xu, Y. M.; Zhang, J. Q.;Cao, C. N. J. Phys. Chem. C 2008, 112, 8725. doi: 10.1021/jp7097476
(23) Oskam, G.; Schmidt, J. C.; Hoffmann, P. M.; Searson, P. C.J. Electrochem. Soc. 1996, 143, 2531. doi: 10.1149/1.1837043
(24) Oskam, G.; Hoffmann, P. M.; Searson, P. C. Phys. Rev. Lett.1996, 76, 1521. doi: 10.1103/PhysRevLett.76.1521
(25) Li, W.; Leng, W. H.; Niu, Z. J.; Li, X.; Fei, H.; Zhang, J. Q.;Cao, C. N. Acta Phys. -Chim. Sin. 2009, 25, 2427. [李文,冷文华,牛振江, 李想, 费会, 张鉴清,曹楚南. 物理化学学报, 2009, 25, 2427.] doi: 10.3866/PKU.WHXB20091210
(26) Klahr, B.; Gimenez, S.; Fabregat-Santiago, F.; Hamann, T.;Bisquert, J. J. Am. Chem. Soc. 2012, 134, 4294. doi: 10.1021/ja210755h
(27) Leng, W. H.; Zhang, Z.; Cheng, S. A.; Zhang, J. Q.; Cao, C. N.Chin. Chem. Lett. 2001, 12, 1019.
(28) Shangguan, P.; Tong, S.; Li, H.; Leng, W. RSC Advances 2013,3, 10163. doi: 10.1039/c3ra41439f

[1]	Tonghui Cui, Hangyue Li, Zewei Lyu, Yige Wang, Minfang Han, Zaihong Sun, Kaihua Sun. Identification of Electrode Process in Large-Size Solid Oxide Fuel Cell [J]. Acta Phys. -Chim. Sin., 2022, 38(8): 2011009-.
[2]	Piao Jin, Zichao Guan, Yan Liang, Kai Tan, Xia Wang, Guangling Song, Ronggui Du. Photocathodic Protection on Stainless Steel by Heterostructured NiO/TiO₂ Nanotube Array Film with Charge Storage Capability [J]. Acta Phys. -Chim. Sin., 2021, 37(3): 1906033-.
[3]	Wangying SHI, Chuan JIA, Yongliang ZHANG, Zewei Lü, Minfang HAN. Differentiation and Decomposition of Solid Oxide Fuel Cell Electrochemical Impedance Spectra [J]. Acta Phys. -Chim. Sin., 2019, 35(5): 509-516.
[4]	Yi-Fan RUAN,Nan ZHANG,Yuan-Cheng ZHU,Wei-Wei ZHAO,Jing-Juan XU,Hong-Yuan CHEN. New Developments in Photoelectrochemical Bioanalysis [J]. Acta Phys. -Chim. Sin., 2017, 33(3): 476-485.
[5]	CHENG Qing-Li, ZHANG Wei-Hua, TAO Bin. Investigation of the Electrochemical Corrosion of Copper under a Micrometric Electrolyte Droplet Using a Three-Electrode System [J]. Acta Phys. -Chim. Sin., 2015, 31(7): 1345-1350.
[6]	HU Yu-Xiang, JIANG Chun-Xiang, FANG Liang, ZHENG Fen-Gang, DONG Wen, SU Xiao-Dong, SHEN Ming-Rong. Effect of HF Treatment on the Photoelectrochemical Properties of a Hematite Thin Film Photoanode for Water Splitting [J]. Acta Phys. -Chim. Sin., 2014, 30(6): 1099-1106.
[7]	LI Song-Mei, YIN Xiao-Lin, LIU Jian-Hua, ZHANG You, XUE Bing. Effect of Doping with Zn-Al-[V₁₀O₂₈]^6- Layered Double Hydroxide on the Properties of Hybrid Sol-Gel Coatings on the LY12 Aluminum Surface [J]. Acta Phys. -Chim. Sin., 2014, 30(11): 2092-2100.
[8]	SUN Xian-Zhong, HUANG Bo, ZHANG Xiong, ZHANG Da-Cheng, ZHANG Hai-Tao, MA Yan-Wei. Experimental Investigation of Electrochemical Impedance Spectroscopy of Electrical Double Layer Capacitor [J]. Acta Phys. -Chim. Sin., 2014, 30(11): 2071-2076.
[9]	LI Wen-Zhang, LIU Yang, LI Jie, YANG Ya-Hui, CHEN Qi-Yuan. Synthesis and Interfacial Electron Transfer of a Composite Film of Graphene and Tungsten Oxide [J]. Acta Phys. -Chim. Sin., 2014, 30(10): 1957-1962.
[10]	LUO Bing, XIA Da-Hai. Characterization of pH Effect on Corrosion Resistance of Nuclear Steam Generator Tubing Alloy by In-situ Scanning Electrochemical Microscopy [J]. Acta Phys. -Chim. Sin., 2014, 30(1): 59-66.
[11]	CHEN Fu-Xiao, FAN Wei-Qiang, ZHOU Teng-Yun, HUANG Wei-Hong. Core-Shell Nanospheres (HP-Fe₂O₃@TiO₂) with Hierarchical Porous Structures and Photocatalytic Properties [J]. Acta Phys. -Chim. Sin., 2013, 29(01): 167-175.
[12]	DAI Yu-Hua, LI Xiao-Jie, FANG Yan-Yan, SHI Qiu-Fei, LIN Yuan, YANG Ming-Shan. Influence of Polymer Gel Electrolyte on the Performance of Dye-Sensitized Solar Cells Analyzed by Electrochemical Impedance Spectroscopy [J]. Acta Phys. -Chim. Sin., 2012, 28(11): 2669-2675.
[13]	SUN Cheng, LI Xi-Ming, XU Jin, YAN Mao-Cheng, WANG Fu-Hui, WANG Zhen-Yao. Effect of Urea on Microbiologically Induced Corrosion of Carbon Steel in Soil [J]. Acta Phys. -Chim. Sin., 2012, 28(11): 2659-2668.
[14]	SUN He-Yun, FAN Jia-Ni, HUANG Pei-Pei, SUN Zhong-Xi. Acid-Base Properties and Adsorption Behaviors of Heavy Metal Ions at the Surface of α-Fe₂O₃/SiO₂Nano-Mixed System [J]. Acta Phys. -Chim. Sin., 2012, 28(09): 2183-2190.
[15]	PANG Ran, ZUO Yu, TANG Yu-Ming, XIONG Jin-Ping. Electrochemical Impedance Spectroscopy Study of Failure Process of an Epoxy/Fluorocarbon Coating System [J]. Acta Phys. -Chim. Sin., 2012, 28(05): 1146-1152.

Influence of the Potential on the Charge-Transfer Rate Constant of Photooxidation of Water over α-Fe₂O₃ and Ti-Doped α-Fe₂O₃

PDF

Like

Knowledge

Abstract

Cite this article

share this article

References

Related Articles 15

Metrics

Recommended 0

Influence of the Potential on the Charge-Transfer Rate Constant of Photooxidation of Water over α-Fe2O3 and Ti-Doped α-Fe2O3

PDF

Like

Knowledge

Abstract

Cite this article

share this article

References

Related Articles 15

Metrics

Recommended 0

Influence of the Potential on the Charge-Transfer Rate Constant of Photooxidation of Water over α-Fe₂O₃ and Ti-Doped α-Fe₂O₃