Proceedings of September Meeting 2016 (NFM16)
Publication date: 14th June 2016
CuBi2O4 is a p-type semiconductor, which has recently shown promise as a photocathode material for photoelectrochemical (PEC) water splitting.[1-3] The band positions are optimally located making CuBi2O4 an ideal candidate for the top absorber in a dual absorber PEC device with a theoretical maximum solar-to-hydrogen efficiency above 20%.[4] Highly efficient CuBi2O4 photocathodes have not yet been demonstrated although the PEC performance is on the rise.[5,6] Recently, we completed a comprehensive evaluation of CuBi2O4 photocathodes in which we identified charge carrier transport as a major limiting factor in the photo-conversion efficiency.[6] We are currently working to overcome this limitation by incorporating alkali metals to improve the charge carrier transport within CuBi2O4 and by adding underlayers to improve the charge carrier transport across the CuBi2O4-substrate interface. This has resulted in significant improvements in the photo-conversion efficiency with CuBi2O4-based photocathodes producing photocurrent densities above 1 mA/cm2 at 0.6 V vs. RHE under AM1.5 illumination. In this work we explore the relationship between the alkali metal concentration, crystal structure, charge carrier mobility and lifetime, contact resistance, and photo-conversion efficiency of CuBi2O4 photocathodes.
References
[1] T. Arai, Y. Konishi, Y. Iwasaki, H. Sugihara, and K. Sayama, J. Comb. Chem., 9 (2007) 574
[2] N.T. Hahn, V.C. Holmberg, B.A. Korgel, and C.B. Mullins, J. Phys. Chem. C, 116 (2012) 6549
[3] S.P. Berglund, H.C. Lee, P.D. Núñez, A.J. Bard, and C.B. Mullins, Phys. Chem. Chem. Phys. 15 (2013) 4554
[4] L.C. Seitz, Z. Chen, A.J. Forman, B.A. Pinaud, J.D. Benck, and T.F. Jaramillo, ChemSusChem 7 (2014) 1372
[5] D. Cao, N. Nasori, Z. Wang, Y. Mi, L. Wen, Y. Yang, S. Qu, Z. Wang, and Y. Lei, J. Mater. Chem. A, 2016, Accepted
[6] S.P. Berglund, F.F. Abdi, P. Bogdanoff, A. Chemseddine, D. Friedrich, and R. van de Krol, Chem. Mat. Submitted
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