Edge-oriented MoS₂ aligned on cellular reduced graphene for enriched dye-sensitized solar cell photovoltaic efficiency

Abstract

The counter electrode (CE) prominence in dye-sensitized solar cells (DSSCs) is undisputed with research geared towards replacement of Pt with viable substitutes with exceptional conductivity and catalytic activity. Herein, we report the replaceable CE with better performance than that of Pt-based electrode. The chemistry between the graphene oxide and ice templates leads to cellular formation of reduced graphene oxide that achieves greater conductivity to the CE. The simultaneous growth of active edge-oriented MoS₂ on the CE through CVD possesses high reflectivity. High reflective MoS₂ trends to increase the electroactivity by absorbing more photons from the source to dye molecules. Thus, the synergistic effect of two materials was found to showcase better photovoltaic performance of 7.6% against 7.3% for traditional platinum CE.

Key words： dye-sensitized solar cell; graphene oxide; molybdenum disulfide; counter electrode

Acknowledgements

We gratefully thank for the Science Foundation of China University of Petroleum, Beijing (2462017YJRC051 and C201603), the National Natural Science Foundation of China (Grant Nos. 21776308, 21576289 and 21322609), the Science Foundation Research Funds Provided to New Recruitments of China University of Petroleum, Beijing (2462014QZDX01) and Thousand Talents Program.

References

1 O'Regan B, Gratzel M. A low-cost, high-efficiency solar-cell based on dye-sensitized colloidal TiO₂ films. Nature, 1991, 353: 737–739

2 Gong F, Wang H, Xu X, . In situ growth of Co_0.85Se and Ni_0.85Se on conductive substrates as high-performance counter electrodes for dye-sensitized solar cells. Journal of the American Chemical Society, 2012, 134(26): 10953–10958

PMID

3 Kim S K, Son M K, Kim J K, . Effect of acetic acid in TiCl₄ post-treatment on nanoporous TiO₂ electrode in dye-sensitized solar cell. Japanese Journal of Applied Physics, 2012, 51(9): 09MA05 doi:10.1143/JJAP.51.09MA05

4 Gratzel M. Dye-sensitized solar cells. Journal of Photochemistry and Photobiology C: Photochemistry Reviews, 2003, 4(2): 145–153 doi:10.1016/S1389-5567(03)00026-1

5 Grätzel M. Solar energy conversion by dye-sensitized photovoltaic cells. Inorganic Chemistry, 2005, 44(20): 6841–6851

PMID

6 Fan M S, Lee C P, Li C T, . Nitrogen-doped graphene/molybdenum disulfide composite as the electrocatalytic film for dye-sensitized solar cells. Electrochimica Acta, 2016, 211: 164–172

7 Wu H, Lv Z, Chu Z, . Graphite and platinum’s catalytic selectivity for disulfide/thiolate (T₂/T⁻) and triiodide/iodide (I₃⁻/I⁻). Journal of Materials Chemistry, 2011, 21(38): 14815–14820

8 Tian H, Gabrielsson E, Yu Z, . A thiolate/disulfide ionic liquid electrolyte for organic dye-sensitized solar cells based on Pt-free counter electrodes. Chemical Communications, 2011, 47(36): 10124–10126

PMID

9 Zhang D W, Li X D, Li H B, . Graphene-based counter electrode for dye-sensitized solar cells. Carbon, 2011, 49(15): 5382–5388

10 Wang G Q, Wang D L, Kuang S, . Research progress on transition metal compound used as highly efficient counter electrode of dye-sensitized solar cells. Journal of Inorganic Materials, 2013, 28(9): 907–915 (in Chinese)

11 Zhang H. Ultrathin two-dimensional nanomaterials. ACS Nano, 2015, 9(10): 9451–9469

PMID

12 Huo J, Zheng M, Tu Y, . A high performance cobalt sulfide counter electrode for dye-sensitized solar cells. Electrochimica Acta, 2015, 159: 166–173

13 Bai Y, Zong X, Yu H, . Scalable low-cost SnS₂ nanosheets as counter electrode building blocks for dye-sensitized solar cells. Chemistry, 2014, 20(28): 8670–8676

PMID

14 Sun X, Dou J, Xie F, . One-step preparation of mirror-like NiS nanosheets on ITO for the efficient counter electrode of dye-sensitized solar cells. Chemical Communications, 2014, 50(69): 9869–9871

PMID

15 Wu M, Lin X, Wang Y, . Economical Pt-free catalysts for counter electrodes of dye-sensitized solar cells. Journal of the American Chemical Society, 2012, 134(7): 3419–3428

PMID

16 Geim A K. Graphene: status and prospects. Science, 2009, 324(5934): 1530–1534

PMID

17 Geim A K, Novoselov K S. The rise of graphene. Nature Materials, 2007, 6(3): 183–191

PMID

18 Bonaccorso F, Sun Z, Hasan T, . Graphene photonics and optoelectronics. Nature Photonics, 2010, 4(9): 611–622

19 Julkapli N M, Bagheri S. Graphene supported heterogeneous catalysts: An overview. International Journal of Hydrogen Energy, 2015, 40(2): 948–979

20 Xu X, Huang D, Cao K, . Electrochemically reduced graphene oxide multilayer films as efficient counter electrode for dye-sensitized solar cells. Scientific Reports, 2013, 3: 1489 doi:10.1038/srep01489

21 RozadaR, Paredes J I, Villar-Rodil S, . Towards full repair of defects in reduced graphene oxide films by two-step graphitization. Nano Research, 2013, 6(3): 216–233 doi:10.1007/s12274-013-0298-6 

22 Pei S, Cheng H M. The reduction of graphene oxide. Carbon, 2012, 50(9): 3210–3228

23 Cheng M, Yang R, Zhang L, . Restoration of graphene from graphene oxide by defect repair. Carbon, 2012, 50(7): 2581–2587

24 Balendhran S, Walia S, Nili H, . Two dimensional molybdenum trioxide and dichalcogenides. Advanced Functional Materials, 2013, 23(32): 3952–3970

25 Lopez-Sanchez O, Lembke D, Kayci M, . Ultrasensitive photodetectors based on monolayer MoS₂. Nature Nanotechnology, 2013, 8(7): 497–501

PMID

26 SI R, Xu X, Yang W, . Highly active and reflective MoS₂ counter electrode for enhancement of photovoltaic efficiency of dye sensitized solar cells. Electrochimica Acta, 2016, 212: 614–620

27 Chen Z, Forman A J, Jaramillo T F. Bridging the gap between bulk and nanostructured photoelectrodes: the impact of surface states on the electrocatalytic and photoelectrochemical properties of MoS₂. The Journal of Physical Chemistry C, 2013, 117(19): 9713–9722

28 Fan M S, Lee C P, Li C T, . Nitrogen-doped graphene/molybdenum disulfide composite as the electrocatalytic film for dye-sensitized solar cells. Electrochimica Acta, 2016, 211: 164–172

29 Liu C J, Tai S Y, Chou S W, . Facile synthesis of MoS₂/graphene nanocomposite with high catalytic activity toward triiodide reduction in dye-sensitized solar cells. Journal of Materials Chemistry, 2012, 22(39): 21057–21064 doi:10.1039/C2JM33679K

30 Lin J Y, Yue G, Tai S Y, . Hydrothermal synthesis of graphene flake embedded nanosheet-like molybdenum sulfide hybrids as counter electrode catalysts for dye-sensitized solar cells. Materials Chemistry and Physics, 2013, 143(1): 53–59

31 Hummers W S, Offeman R E. Preparation of graphitic oxide. Journal of the American Chemical Society, 1958, 80: 1339

32 Liang Y, Wang H, Sanchez Casalongue H, . TiO₂ nanocrystals grown on graphene as advanced photocatalytic hybrid materials. Nano Research, 2010, 3(10): 701–705

33 Li X L, Ge J P, Li Y D. Atmospheric pressure chemical vapor deposition: an alternative route to large-scale MoS₂ and WS₂ inorganic fullerene-like nanostructures and nanoflowers. Chemistry, 2004, 10(23): 6163–6171

PMID

34 Wang Z L, Xu D, Huang Y, . Facile, mild and fast thermal-decomposition reduction of graphene oxide in air and its application in high-performance lithium batteries. Chemical Communications, 2012, 48(7): 976–978

PMID

35 Choi H, Kim H, Hwang S, . Graphene counter electrodes for dye-sensitized solar cells prepared by electrophoretic deposition. Journal of Materials Chemistry, 2011, 21(21): 7548–7551

36 Deville S. Freeze-casting of porous ceramics: A review of current achievements and issues. Advanced Engineering Materials, 2008, 10(3): 155–169

37 Diez-Betriu X, Alvarez-Garcia S, Botas C, . Raman spectroscopy for the study of reduction mechanisms and optimization of conductivity in graphene oxide thin films. Journal of Materials Chemistry C: Materials for Optical and Electronic Devices, 2013, 1(41): 6905–6912

38 Deokar G, Vignaud D, Arenal R, . Synthesis and characterization of MoS₂ nanosheets. Nanotechnology, 2016, 27(7): 075604

PMID

39 Lee J E, Jung J, Ko T Y, . Catalytic synergy effect of MoS₂/reduced graphene oxide hybrids for a highly efficient hydrogen evolution reaction. RSC Advances, 2017, 7(9): 5480–5487

40 Zheng X, Xu J, Yan K, . Space-confined growth of MoS₂ nanosheets within graphite: the layered hybrid of MoS₂ and graphene as an active catalyst for hydrogen evolution reaction. Chemistry of Materials, 2014, 26(7): 2344–2353