Publications

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2022
Devdass, A., Watson, J., Firestone, E., Hamann, T.W., Delcamp, J.H., Jurss, J.W.; “An Efficient Copper-based Redox Shuttle Bearing a Hexadentate Polypyridyl Ligand for DSCs Under Low-Light Conditions” ACS Applied Energy Materials, 2022, DOI: 10.1021/acsaem.2c00344

Mi, C., Ghazfar, R., Smith, M.R., Hamann, T.W.; “Ammonia eurefstics: Electrolytes for liquid energy storage and conversion at room temperature and ambient pressure” Joule 2022, DOI:https://doi.org/10.1016/j.joule.2022.03.001

Velore, J., Pradhan, S.C., Hamann, T.W., Hagfeldt, A., Unni, K.N.N., Soman, S.; "Understanding Mass Transport in Copper Electrolyte-Based Dye-Sensitized Solar Cells: ACS Applied Energy Materials, DOI: 10.1021/acsaem.1c04121

Xiao, Y., Vanka, S., Pham, T.A., Dong, W.J. Sun, Y, Liu, X., Navid, A.N., Varley, J.B., Hajibabaei, H., Hamann, T.W., Ogitsu, T., Mi, Z.; “Crystallographic Effects of GaN Nanostructures in Photoelectrochemical Reaction” Nano Letters 2022, 22, 6, 2236-2243

2021
Kim, T.Y., Kim, B.S., Oh, J.G., Park, S.C., Jang, J., Hamann, T.W., Kang, Y.S., Bang, J.H., Giménez, S., Kang Y.S.; “Interfacial Engineering at Quantum Dot-Sensitized TiO2 Photoelectrodes for Ultrahigh Photocurrent Generation” ACS Applied Materials and Interfaces 2021, 13 (5), 6208-6218

2020
Vanka, S., Zhou, B., Awni, R.A., Song, Z., Chowdhury, F.A., Liu, X., Hajibabaei, H., Shi, W., Xiao, Y., Navid, I.A., Pandey, A., Chen, R., Botton, G.A. Hamann, T.W., Wang, D., Yan, Y, Mi; "InGaN/Si Double-Junction Photocathode for Unassisted Solar Water Splitting" ACS Energy Letters 2020, 5, XXX, 3741–3751 DOI: 10.1021/acsenergylett.0c01583

Han, R., Kim, T.Y., Hamann, T.W., Osterloh, F.E.; “Photochemical Charge Separation and Dye Self-Oxidation Control Performance of Fluorescein, Rose Bengal, and Triphenylamine Dye-Sensitized Solar Cells” Journal of Physical Chemistry C 2020, XX, XXXX - XXXX DOI: 10.1021/acs.jpcc.0c09052

Shadabipour, P., Raithel, A.L., Hamann, T.W.; “Charge-Carrier Dynamics at the CuWO4/Electrocatalyst Interface for Photoelectrochemical Water Oxidation” ACS Applied Materials & Interfaces 2020, 12, 45, 50592- 50599 DOI: 10.1021/acsami.0c14705

Qing, G., Ghazfar, R., Jackowski, S.T., Habibzadeh, F., Maleka Ashtiani, M., Chen, C. Smith, M.R., Hamann, T.W.; “Recent Advances and Challenges of Electrocatalytic N2 Reduction to Ammonia” Chemical Reviews 2020,120, 12, 5437–5516

Raithel, A.L., Kim, T.Y., Nielsen, K., Staples, R.J., Hamann, T.W.; “Low-Spin Cobalt(II) Redox Shuttle by Isocyanide Coordination” Sustainable Energy & Fuels 2020 4, 2497 - 2507

Kim, T.Y., Wang, Y., Raithel, A.L., Hamann, T.W.; “Real-Time Observation of the Diffusion Mechanism Progression from Liquid to Solid-State of Transition Metal Complexes” ACS Energy Letters 2020 5, 2, 583-588

Shadabipour, P., Hamann, T.W.; “Interface Passivation to Overcome Shunting in Semiconductor-Catalyst Junctions” Chemical Communications 2020, 56, 2570 - 2573

2019
Broadwater, D., Bates, M., Jayaram, M., Young, M., He, J., Raithel, A.L., Hamann, T.W., Zhang, W., Borhan, B., Lunt, R.R., Lunt, S.Y. “Modulating Cellular Cytotoxicity and Phototoxicity of Fluorescent Organic Salts through Counterion Pairing” Scientific reports 2019, 9, 15288

Hajibabaei, H. Little, D., Pandey, A., Wang, D., Mi, Z., Hamann, T.W.; “Direct Deposition of Crystalline Ta3N5 Thin-Films on FTO for PEC Water Splitting” ACS Applied Materials & Interfaces 2019, 11, 17, 15457-15466

Qing, G., Hamann, T.W.; "New Electrolytic Devices Produce Ammonia with Exceptional Selectivity" Joule 2019, 3 (3), 634–636

He, Y., Vanka, S., Gao, T., He, Da, Espano, J., Zhao, Y., Dong, Q., Lang, C., Wang, Y., Hamann, T.W., Mi, Z., Wang, D.; "Dependence of interface energetics and kinetics on catalyst loading in a photoelectrochemical system" Nano Research 2019, DOI: 10.1007/s12274-019-2346-3

Habibzadeh, F., Miller, S.L., Hamann, T.W., Smith, M.R.; “Homogeneous electrocatalytic oxidation of ammonia to N2 under mild conditions” Proceedings of the National Academy of Science, 2019, 116 (8) 2849-2853

He, Y., Hamann, T.W., Wang, D.; “Thin film photoelectrodes for solar water splitting” Chemical Society Reviews, 2019, DOI: 10.1039/C8CS00868J

2018
Wang, Y., Hamann, T.W.; “Improved Performance Induced by in-situ Ligand Exchange Reactions of Copper Bipyridyl Redox Couples in Dye-Sensitized Solar Cells” Chemical Communications, 2018, DOI: 10.1039/C8CC07191H

Baillargeon, J., Xie, Y., Raithel, A.L., Ghaffari, B., Staples, R.J., Hamann, T.W.; “Spin-Doctoring Cobalt Redox Shuttles for Dye-Sensitized Solar Cells” Inorganic Chemistry 2018, 57 (18), 11633–11645

Qiu, J., Hajibabaei, H., Nellist, M.R., Laskowski, F.A.L, Oener, S.Z., Hamann, T.W., Boettcher, S.W.; “Correction to Catalyst Deposition on Photoanodes: The Roles of Intrinsic Catalytic Activity, Catalyst Electrical Conductivity, and Semiconductor Morphology” ACS Energy Letters 2018, 3, 1771-1771

Hajibabaei, H., Gao, Y., Hamann, T.W “Unravelling the Charge Transfer Mechanism in Water Splitting Hematite Photoanodes.” In Advances in Photoelectrochemical Water Splitting: Theory, Experiment and Systems Analysis; The Royal Society of Chemistry, 2018; pp 100 – 127.

Liu, D., Wang, Q., Elinski, M., Chen, P., Traverse, C.J., Yang, C., Young, M., Hamann, T.W., Lunt, R.R.; “Ultrathin Hole Extraction Layer for Efficient Inverted Perovskite Solar Cells” ACS Omega, 2018, 3 (6) 6339 - 6345

Wang, Q., Jiang, C., Zhang, P., Hamann, T.W.; “Overcoming Bulk Recombination Limits of Layered Perovskite Solar Cells with Mesoporous Substrates” Journal of Physical Chemistry C, 2018 DOI: 10.1021/acs.jpcc.8b01592
*Prashant V, Kamat Festschrift

Jiang, C., Xie, Y., Lunt, R.R., Hamann, T.W., Zhang, P.; Elucidating the Impact of Thin Film Texture on Charge Transport and Collection in Perovskite Solar Cells" ACS Omega 2018 3 (3), 3522-3529

Qiu, J., Hajibabaei, H., Nellist, M.R., Laskowski, F.A.L, Hamann, T.W., Boettcher, S.W.; “Catalyst Deposition on Photoanodes: The Roles of Intrinsic Catalytic Activity, Catalyst Electrical Conductivity, and Semiconductor Morphology” ACS Energy Letters 2018, 3, 961-969

Liu, D., Wang, Q., Traverse, C.J., Yang, C., Young, M., Kuttipillai, P.S., Lunt, S.Y., Hamann, T.W., Lunt, R.R.; “Impact of Ultrathin C60 on Perovskite Photovoltaic Devices” ACS Nano, 2018, 12 (1) 876 - 883

Nellist, M.R., Laskowski, F.A.L, Qiu, J., Hajibabaei, H., Sivula, K., Hamann, T.W., Boettcher, S.W.; “Potential-sensing electrochemical atomic force microscopy for in operando analysis of water-splitting catalysts and interfaces” Nature Energy 2018, 3, 46 - 52
*Nature Energy (2017), News and Views, by Francesca Maria Toma

2017
Hajibabaei, H., Hamann, T.W.; “Selective Electrodeposition of Tantalum(V) Oxide Electrodes” Langmuir 2017, 33 (41), 10800–10806

Farha, O., Hamann, T.W., Martinson, A.B.F., Mulfort, K.; “Material and Interfaces for Energy Related Applications” ACS Applied Materials & Interfaces 2017, 9 (39), 33377–333788

Chu, S., Li, W., Yan, Y., Hamann, T.W., Shih, I., Wang, D., Mi, Z.; “Roadmap on Solar Water Splitting: Current Status and Future Prospects” Nano Futures 2017, 1, 022001
*NanoTechWeb Highlight

Qiu, J., Hajibabaei, H., Nellist, M.R., Laskowski, F.A.L, Hamann, T.W., Boettcher, S.W.; “Direct In Situ Measurement of Charge Transfer Processes During Photoelectrochemical Water Oxidation on Catalyzed Hematite” ACS Central Science 2017, 3 (9), 1015-1025

Hajibabaei, H., Schon, A.R., Hamann, T.W.; “Interface Control of PEC Water Oxidation Performance with Ni1-xFexOy Modified Hematite Photoanodes” Chemistry of Materials 2017, 29 (16), 6674-6683

Gao, Y., Hamann, T.W.; “Elucidation of CuWO4 Surface States During Photoelectrochemical Water Oxidation” Journal of Physical Chemistry Letters, 2017, 8 (12), 2700-2704
*Live Slide Presentation

Little, D.J., Edwards, D.O., Smith, M.R., Hamann, T.W.; “As Precious as Platinum: Iron Nitride for Electrocatalytic Oxidation of Liquid Ammonia” ACS Applied Materials & Interfaces 2017, 9 (19), 16228-16235

Baillargeon, J., Xie, Y., Hamann, T.W.; “Bifurcation of Regeneration and Recombination in Dye-Sensitized Solar Cells via Electronic Manipulation of Tandem Cobalt Redox Shuttles” ACS Applied Materials & Interfaces 2017, 9 (30), 33544–33548

Gao, Y., Hamann, T.W.; “Quantitative Hole Collection for Photoelectrochemical Water Oxidation with CuWO4 ” Chemical Communications, 2017, 53, 1285–1288

2016
Hajibabaei, H., Zandi, O., Hamann, T.W.; “Tantalum Nitride Films Integrated with Transparent Conductive Oxide Substrates via Atomic Layer Deposition for Photoelectrochemical Water Splitting” Chemical Science, 2016, 7, 6760–6767

Zandi, O., Hamann, T.W.; “Determination of Photoelectrochemical Water Oxidation Intermediates on Hematite Electrode Surfaces Using Operando Infrared Spectroscopy” Nature Chemistry, 2016, 8, 778-783
         *Nature Chemistry 8, 740–741 (2016), News and Views, by Alexander Cowan

Mandal, D., Hamann, T.W.; “Charge distribution in nanostructured TiO2 photoanodes determined by quantitative analysis of the band edge unpinning” ACS Applied Materials & Interfaces  2016, 8 (1), 419–424

Zandi, O., Schon, A.R., Hajibabaei, H., Hamann, T.W.; “Enhanced Charge Separation and Collection in High Performance Electrodeposited Hematite Films” Chemistry of Materials, 2016, 28 (3), 765–771

Gao, Y., Zandi, O., Hamann, T.W.; “Atomic Layer Stack Deposition-Annealing Synthesis of CuWO4” Journal of Materials Chemistry A, 2016, 4, 2826-2830
         *special edition “Water splitting and photocatalysis” edited by Mallouk, Boettcher and Osterloh

2015
Xie, Y., Baillargeon, J., Hamann, T.W.; “Regeneration and Recombination Reactions in Dye Sensitized Solar Cells Employing Cobalt Redox Shuttles” Journal of Physical Chemistry C., 2015, 119 (50), 28155–28166

Zandi, O., Hamann, T.W.; “The Potential versus Current State of Water Splitting with Hematite” Physical Chemistry Chemical Physics, 2015, 17, 22485-22503

Little, D.J., Smith, M.R., Hamann, T.W.; “Electrolysis of Liquid Ammonia for Hydrogen Generation” Energy & Environmental Science, 2015, 8, 2775-2781

Mandal, D., Hamann, T.W.; “Energetics of Nanoparticle Semiconductor Electrodes Determined by Spectroelectrochemical Measurements of Free Electrons.” Physical Chemistry Chemical Physics 2015, 17, 11156–11160

Klahr, B., Gimenez, S. Zandi, O., Fabregat-Santiago, F., Hamann, T.; “Competitive Photoelectrochemical Methanol and Water Oxidation with Hematite Electrodes.” ACS Applied Materials & Interfaces 2015, 7 (14), 7653–7660

2014
Hamann, T.W.; “Perovskites take lead in solar hydrogen race.” Science 345, 1566 (2014)
         *Science 345, 1593 (2014), by Luo, Grätzel and co-workers

Young, K.M.H., Hamann, T.W.; “Enhanced photocatalytic water oxidation efficiency with Ni(OH)2 catalysts deposited on a-Fe2O3 via ALD.” Chem. Commun., 2014, 50 (63) 8727-8730

Kronawitter, C.X., Zegkinoglou, I., Shen, S.H., Liao, P., Cho, I.S., Zandi, O., Lashgari, K., Westin, G., Guo, J.H., Himpsel, F.J., Carter, E.A., Zheng, X.L., Hamann, T.W., Koel, B.E., Mao, S.S., Vayssieres, L.; “On Theoretical and Experimental Titanium Incorporation into Hematite Nanostructures” Energy Environ. Sci., 2014, 7, 3100-3121

Soman, S., Xie, Y., Hamann, T.W.; “Cyclometalated sensitizers for DSSCs employing cobalt redox shuttles” Polyhedron, 2014, 82, 139–147
   *special edition “Molecular Materials for Solar Energy Conversion” edited by Ed Constable

Zandi, O., Hamann, T.W.; “Enhanced Photovoltage Through Selective Surface State Removal” J. Phys. Chem. Lett. 2014, 5 (9), 1522–1526
   *Live Slide Presentation

Klahr, B.M.; Hamann, T.W.; “Water Oxidation on Hematite Photoelectrodes: Insight on the Nature and Identity of Surface States through In-situ Spectroelectrochemistry” J. Phys. Chem. C 2014, 118 (19), 10393–10399

Zandi, O., Beardslee, J.A., Hamann, T.W.; “Substrate Dependent Water Splitting with Ultrathin α-Fe2O3 Electrodes” J. Phys. Chem. C 2014, 118 (30), 16494–16503
         *Michael Gratzel Festschrift

Hamann, T.W.; “Water splitting: An adaptive junction.” Nature Materials 2014, 13, 3–4
         *Nature Materials 13, 81–86 (2014), by Lin and Boettcher

2013
Young, K.M.H., Klahr, B.M., Zandi, O., Hamann, T.W.; “Photocatalytic Water Oxidation with Hematite Electrodes.” Catalysis Science & Technology, 2013, 3, 1660-1671

Riha, S.C., Klahr, B.M., Tyo, E.C., Seifert, S., Vajda S., Pellin, M.J., Hamann, T.W., Martinson, A.B.F.; “Atomic Layer Deposition of a Sub-monolayer Catalyst for the Enhanced Photoelectrochemical Performance of Water Oxidation with Hematite.” ACS Nano 2013, 7 (3), 2396–2405

Xie, Y., Hamann, T.W.; “Fast Low Spin Cobalt Complex Redox Shuttles for Dye-Sensitized Solar Cells.” J. Phys. Chem. Lett., 2013, 4, 328–332

Zandi, O., Klahr, B.M., Hamann, T.W.; “Highly Photoactive Ti-doped α-Fe2O3 Thin Film Electrodes; Resurrection of the Dead Layer.” Energy Environ. Sci., 2013, 6, 634–642

Ondersma, J.W.; Hamann, T.W.; “Recombination and Redox Couples in Dye-Sensitized Solar Cells.” Coordination Chemistry Reviews 2013, 257, 1533–1543

2009 - 2012
Ondersma, J.W.; Hamann, T.W.; “Conduction Band Energy Determination by Variable Temperature Spectroelectrochemistry.” Energy Environ. Sci. 2012, 5 (11), 9476–9480

Klahr, B.M., Gimenez S., Fabregat-Santiago, F., Bisquert, J., Hamann, T.W.; “Photoelectrochemical and Impedance Spectroscopic Investigation of Water Oxidation with “Co-Pi” coated Hematite Electrodes.” J. Am. Chem. Soc. 2012, 134 (40), 16693–16700
*Nature Chemistry 4, 965–967 (2012), News and Views, by Daniel Gamelin

Hamann, T.W.; “Splitting Water with Rust: Hematite Photoelectrochemistry.” Dalton Trans., 2012, 41, 7830–7834

Klahr, B.M., Gimenez S., Fabregat-Santiago, F., Bisquert, J., Hamann, T.W.; “Electrochemical and Photoelectrochemical Investigation of Water Oxidation with Hematite Electrodes.” Energy Environ. Sci. 2012, 5 (6), 7626–1636

Klahr, B.M., Gimenez S., Fabregat-Santiago, F., Hamann, T.W., Bisquert, J.; “Water oxidation at hematite photoelectrodes: the role of surface states.” J. Am. Chem. Soc. 2012, 134 (9), 4294–4302

Hamann, T.W.; “The End of Iodide? Cobalt Complex Redox Shuttles in DSSCs.” Dalton Trans., 2012, 41 (11), 3111–3115

Ondersma, J.W.; Hamann, T.W.; “ Spatially-Resolved Sources of Dark Current in Nanoparticle TiO2 Electrodes.” Langmuir 2011, 27 (21), 13361–13366

Klahr, B.M.; Hamann, T.W.; “Voltage Dependent Photocurrent of Thin Film Hematite Electrodes.” Appl. Phys. Lett., 99, 063508 (2011)

Ondersma, J.W.; Hamann, T.W.; “Measurements and Modeling of Recombination from Nanoparticle TiO2 Electrodes.” J. Am. Chem. Soc. 2011, 133 (21), 8264–8271

Klahr, B.M.; Hamann, T.W.; “Current and Voltage Limiting Processes in Thin Film Hematite Electrodes.” J. Phys. Chem. C 2011, 115 (16), 8393–8399

Klahr, B.M.; Martinson, A.B.F.; Hamann, T.W.; “Photoelectrochemistry of Ultra Thin Film Iron Oxide Electrodes Prepared by Atomic Layer Deposition.” Langmuir 2011, 27 (1), 461–468

Hamann, T.W.; Ondersma, J.W.; “Redox Shuttles in Dye-Sensitized Solar Cells.”Energy Environ. Sci., 2011, 4, 370–381

Ondersma, J.W.; Hamann, T.W.; “Impedance Investigation of Dye-Sensitized Solar Cells Employing Outer-Sphere Redox Shuttles.” J. Phys. Chem. C. 2010, 114, (1), 638–645

Klahr, B.M.; Hamann, T.W.; “Performance Enhancement and Limitations of Cobalt Dipyridyl Redox Shuttles in Dye-Sensitized Solar Cells.” J. Phys. Chem. C. 2009, 113, (31), 14040–14045

Postdoctoral work
Hamann, T.W.; Farha O.K.; M.; Hupp, J.T.; “Outer-sphere Redox Couples as Shuttles in Dye-Sensitized Solar Cells. Performance Enhancement Based on Photoelectrode Modification via Atomic Layer Deposition.” J. Phys. Chem. C 2008, 112, 19756-19764

Hamann, T.W.; Jensen, R.A.; Martinson, A.B.F.; Van Ryswyk H.; Hupp, J.T.; “Advancing beyond current generation dye-sensitized solar cells.” Energy Environ. Sci., 2008, 1, 66–78

Hamann, T.W.; Martinson, A.B.F.; Pellin, M.; Hupp, J.T.; “Novel TiO2 Nanostructured Photoanodes in Dye-Sensitized Solar Cells.” J. Phys. Chem. C. 2008, 112, 10303-10307

Hamann, T.W.; Martinson, A.B.F.; Pellin, M.; Hupp, J.T.; “Aerogel templated ZnO Dye-Sensitized Solar Cells.” Adv. Mater. 2008, 20, 1560–1564

Martinson, A.B.F.; Hamann, T.W.; Pellin, M.; Hupp, J.T.; “Alternative Photoanode Architectures for Dye-Sensitized Solar Cells.” Chem. Eur. J. 2008, 14, 4458 – 4467

Graduate work
Hamann, T.W.; Brunschwig, B. S.; Lewis, N. S.; “A Comparison of the Self-Exchange and Interfacial Charge-Transfer Rate Constants for Methyl vs. t-Butyl Substituted Os(III) Polypyridyl Complexes.”  J. Phys. Chem. B. 2006, 110, 25514-25520

Hamann, T.W.; Lewis, N. S.; “Control of the Stability, Electron-Transfer Kinetics, and pH-Dependent Energetics of Si/H2O Interfaces Through Methyl Termination of Si(111) Surfaces” J. Phys. Chem. B. 2006, 110, 22291-22294

Royea, W.J.; Hamann, T.W.; Brunschwig, B. S.; Lewis, N. S.; “A Comparison Between Interfacial Electron-Transfer Rate Constants at Metallic and Graphite Electrodes.”  J. Phys. Chem. B. 2006, 110, 19433-19442

Hamann, T.W.; Gstrein, F.; Brunschwig, B. S.; Lewis, N. S.; “Measurement of the Driving Force Dependence of Interfacial Charge-Transfer Rate Constants in Response to pH Changes at n-ZnO/H2O Interface.” Chem. Phys. 2006, 326, 13-26

Hamann, T.W.; Srivatsan, N.; Van Willigen, H.; “Time-Resolved EPR Study of the Photophysics and Photochemistry of 1-(3-(Methoxycarbonyl)Propyl)-1-Phenyl[6.6]C61” J. Phys. Chem. A  2005, 109, 11665 – 11672

Hamann, T.W.; Gstrein, F.; Brunschwig, B. S.; Lewis, N. S.; “Measurement of the Dependence of Interfacial Charge-Transfer Rate Constants on the Reorganization Energy of Redox Species at n-ZnO/H2O Interfaces.”  J. Am Chem. Soc. 2005, 127, 13949 – 13954

Hamann, T.W.; Gstrein, F.; Brunschwig, B. S.; Lewis, N. S.; “Measurement of the Free Energy Dependence of Interfacial Charge-Transfer Rate Constants Using ZnO/H2O Semiconductor/Liquid Contacts.”  J. Am. Chem. Soc. 2005, 127, 7815 – 7824

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