Effect of Co and P doping on α-Fe2O3 photoelectrochemical catalysis water splitting
-
摘要:
在众多光阳极材料中，纳米结构材料α-Fe2O3由于其光吸收显著、化学稳定性好、储量丰富等优势，被认为是最有前途的材料之一。利用水热法制备了具有良好光解水性能的Co和P掺杂α-Fe2O3纳米材料。经过掺杂后α-Fe2O3纳米材料仍为纳米棒状形貌，纳米棒的粒径增加。实验发现，Co掺杂α-Fe2O3制成的电极在标准光照射下的最大光生电流密度为0.453 mA/cm2，是未掺杂样品的20.6倍，P掺杂α-Fe2O3制成的电极在标准光照射下的最大光生电流密度为0.276 mA/cm2，是未掺杂样品的12.5倍，具备了高效光解水性能。同时通过SEM、TEM、XRD、UV-Vis和Mott-Schottky测试等方法，结合形貌与结构表征，研究了α-Fe2O3的光电化学分解水性能影响机理。
Abstract:Among many photoanode materials, the nanostructured material α-Fe2O3 is considered as one of the most promising materials due to its remarkable light absorption, good chemical stability and abundant reserves. Co and P doped α-Fe2O3 nanomaterials with excellent water splitting properties were prepared by hydrothermal method. After doping, α-Fe2O3 nanomaterial is still nanorod shaped, and the particle size of nanorods increases. Experiments show that the maximum photocurrent density has reached 0.453 mA/cm2(Co doped α-Fe2O3) and 0.276 mA/cm2(P doped α-Fe2O3) in the standard light, which are 20.6 and 12.5 times higher than those of the undoped samples, respectively. Thus, they have the property of efficient photocatalytic water splitting. At the same time, we used SEM, TEM, XRD, UV-Vis, and Mott-Schottky testing methods, which are combined with the morphology and structure characterization, to study the property influence mechanism of photoelectrochemical water splitting of α-Fe2O3.
-
图 1 未掺杂、P掺杂和Co掺杂α-Fe2O3薄膜的J-V曲线
Figure 1. J-V curves of pristine, P doped and Co doped α-Fe2O3 films
图 2 未掺杂、P掺杂和Co掺杂α-Fe2O3薄膜的Mott-Schottky曲线
Figure 2. Mott-Schottky curves of pristine, P doped and Co doped α-Fe2O3 films
图 4 未掺杂、P掺杂和Co掺杂的α-Fe2O3的UV-Vis图谱
Figure 4. UV-Vis spectra of pristine, P doped and Co doped and α-Fe2O3
图 5 未掺杂、P掺杂和Co掺杂的α-Fe2O3的XRD图谱
Figure 5. XRD patterns of pristine, P doped and Co doped α-Fe2O3
-
[1] FUJISHIMA A, HONDA K.Electrochemical photolysis of water at a semiconductor electrode[J].Nature, 1972, 238(5358):37-38. doi: 10.1038/238037a0 [2] ASAHI R, MORIKAWA T, OHWAKI T, et al.Visible-light photocatalysis in nitrogen-doped titanium oxides[J].Science, 2001, 293(5528):269-271. doi: 10.1126/science.1061051 [3] CHEN X, MAO S S.Titanium dioxide nanomaterials:Synthesis, properties, modifications, and applications[J].Chemical Reviews, 2007, 107(41):2891-2959. doi: 10.1021/cr0500535 [4] FRANKING R, LI L, LUKOWSKI M A, et al.Facile post-growth doping of nanostructured hematite photoanodes for enhanced photoelectrochemical water oxidation[J].Energy & Environmental Science, 2013, 6(2):500-512. http://pubs.rsc.org/en/content/articlehtml/2012/ee/c2ee23837c [5] CESAR I, SIVULA K, KAY A, et al.Influence of feature size, film thickness, and silicon doping on the performance of nanostructured hematite photoanodes for solar water splitting[J].Journal of Physics Chemistry C, 2009, 113(2):772-782. doi: 10.1021/jp809060p [6] LIAO P, TOROKER M C, CARTER E A.Electron transport in pure and doped hematite[J].Nano Letters, 2011, 11(4):1775-1781. doi: 10.1021/nl200356n [7] ZHANG P, SHWARSCTEIN K A, HU Y S, et al.Oriented Ti doped hematite thin film as active photoanodes synthesized by facile APCVD[J].Energy & Environmental Science, 2011, 4(3):1020-1028. http://pubs.rsc.org/en/content/articlehtml/2011/ee/c0ee00656d [8] ZANDI O, KLAHR B M, HAMANN T W.Highly photoactive Ti-doped α-Fe2O3 thin film electrodes:Resurrection of the dead layer[J].Energy & Environmental Science, 2013, 6(2):634-642. http://pubs.rsc.org/en/Content/ArticleLanding/2013/EE/C2EE23620F#!divAbstract [9] RIOULT M, MAGNAN H, STANESCU D, et al.Single crystalline hematite films for solar water splitting:Ti-doping and thickness effects[J].Journal of Physics Chemistry C, 2014, 118(6):3007-3014. doi: 10.1021/jp500290j [10] ABEL A J, PATEL A M, SMOLIN S Y, et al.Enhanced photoelectrochemical water splitting via SILAR-deposited Ti-doped hematite thin films with an FeOOH overlayer[J].Journal of Materials Chemistry A, 2016, 4(17):6495-6504. doi: 10.1039/C6TA01862A [11] KUMARN P, SHARMA P, JOSHI A G, et al.Nano porous hematite for solar hydrogen production[J].Journal of Electrochemical Society, 2012, 159(8):H685-H691. doi: 10.1149/2.016208jes [12] SHEN S, GUO P, WHEELER D A, et al.Physical and photoelectrochemical properties of Zr-doped hematite nanorod arrays[J].Nanoscale, 2013, 5(20):9867-9874. doi: 10.1039/c3nr03245k [13] LIN Y, XU Y, MAYER M T, et al.Growth of p-type hematite by atomic layer deposition and its utilization for improved solar water splitting[J].Journal of the American Chemical Society, 2012, 134(12):5508-5511. doi: 10.1021/ja300319g [14] KOSA M, BARAD H N, SINGH V, et al.A combined computational and experimental investigation of Mg doped α-Fe2O3[J].Physical Chemistry Chemical Physics, 2016, 18(2):781-791. doi: 10.1039/C5CP05987A [15] INGLER W B, KHAN S U M.Photoresponse of spray pyrolytically synthesized copper-doped P-Fe2O3 thin film electrodes in water splitting[J].International Journal of Hydrogen Energy, 2005, 30(8):821-827. doi: 10.1016/j.ijhydene.2004.06.014 [16] INGLERJR W B I, BALTRUS J P, KHAN S U M.Photoresponse of p-type zinc-doped lron(Ⅲ) oxide thin films[J].Journal of the American Chemical Society, 2004, 126(33):10238-10239. doi: 10.1021/ja048461y [17] QI X, SHE G, WANG M, et al.Electrochemical synthesis of p-type Zn-doped α-Fe2O3, nanotube arrays for photoelectrochemical water splitting[J].Chemical Communications, 2013, 49(51):5742-5744. doi: 10.1039/c3cc40599k [18] SCHREBLER R S, BALLESTEROS L, BURGOS A, et al.Electrodeposited nanostructured α-Fe2O3 photoanodes for solar water splitting:Effect of surface co-modification on photoelectrochemical performance[J].Journal of the Electrochemical Society, 2011, 158(8):D500-D505. doi: 10.1149/1.3599059 [19] LIAO P, KEITH J A, CARTER E A.Water oxidation on pure and doped hematite (0001) surfaces:Prediction of Co and Ni as effective dopants for electrocatalysis[J].Journal of the American Chemical Society, 2012, 134(32):13296-13309. doi: 10.1021/ja301567f [20] LEE C Y, WANG L, KADO Y, et al.Si-doped Fe2O3, nanotubular/nanoporous layers for enhanced photoelectrochemical water splitting[J].Electrochemistry Communications, 2013, 3(5):308-311. http://www.doc88.com/p-6711224005013.html [21] KAY A, CESAR I, GRAETZEL M.New Benchmark for water photooxidation by nanostructured α-Fe2O3 films[J].Journal of the American Chemical Society, 2006, 128(49):15714-15721. doi: 10.1021/ja064380l [22] ZHANG Y, JIANG S, SONG W, et al.Nonmetal P-doped hematite photoanode with enhanced electron mobility and high water oxidation activity[J].Energy & Environmental Science, 2015, 8(4):1231-1236. http://or.nsfc.gov.cn/handle/00001903-5/197240 [23] LIN Y, ZHOU S, SHEEHAN S W, et al.Nanonet-based hematite heteronanostructures for efficient solar water splitting[J].Journal of the American Chemical Society, 2011, 133(8):2398-2401. doi: 10.1021/ja110741z [24] XI L, TRAN P D, CHIAM S Y, et al.Co3O4-decorated hematite nanorods as an effective photoanode for solar water oxidation[J].Journal of Physics Chemistry C, 2012, 116(26):13884-13889. doi: 10.1021/jp304285r [25] LIAN X, XIN Y, LIU S, et al.Enhanced photoelectrochemical performance of Ti-doped hematite thin films prepared by the sol-gel method[J].Applied Surface Science, 2012, 258(7):2307-2311. doi: 10.1016/j.apsusc.2011.10.001 [26] MORRISH R, RAHMAN M, MACELROY J M, et al.Activation of hematite nanorod arrays for photoelectrochemical water splitting[J].CHEMSUSCHEM, 2011, 4(4):474-479. doi: 10.1002/cssc.201100066 [27] MENG X, QIN G, GODDARD A G, et al.Theoretical understanding of enhanced photoelectrochemical catalytic activity of Sn-doped hematite:Anisotropic catalysis and effects of morin transition and Sn doping[J].Journal of Physics Chemistry C, 2013, 117(8):3779-3784. doi: 10.1021/jp310740h -
下载:
点击查看大图
计量
- 文章访问数: 592
- HTML全文浏览量: 20
- PDF下载量: 395
- 被引次数: 0
