Imperial College London

Dr Steph Pendlebury

Faculty of Natural SciencesDepartment of Physics

Programme Manager for the Centre for Plastic Electronics
 
 
 
//

Contact

 

+44 (0)20 7594 7235s.pendlebury Website

 
 
//

Location

 

Huxley 1005Huxley BuildingSouth Kensington Campus

//

Summary

 

Summary

Charge Carrier Dynamics in Photoelectrodes for Artificial Photosynthesis

Steph received a Masters in Chemistry from the University of Edinburgh in 2008, and did her PhD with the Durrent group on Charge Carrier Dynamics in Hematite Photoanodes for Solar Water Oxidation (2008-2012). 

Steph is now a post-doctoral research associate, investigating charge carrier dynamics in semiconductor materials for artificial photosynthesis ("solar fuels").  The effects of doping, film thickness, morphology, surface treatment and heterostructures on charge carrier dynamics in photoelectrodes both in isolation and in complete working photoelectrochemical (PEC) cells are studied.  Steph uses transient absorption spectroscopy (TAS) on picosecond-nanosecond and microsecond-second timescales to directly monitor photogenerated electrons and holes.  Photoelectrochemical (PEC) techniques utilised include current/voltage measurements, IPCE/APCE (external/internal quantum efficiency) and fast (nanosecond-second timescale) transient photocurrent (TPC) and transient photovoltage (TPV).  TAS in conjunction with TPC & TPV allow elucidation of the relative rates of charge carrier recombination, electron extraction and hole transfer (water oxidation).  Understanding the effects of electrical bias (applied voltage) and light intensity on the rates of charge carrier recombination, electron extraction and water oxidation provide insights into the factors limiting solar-to-hydrogen efficiency of photoelectrode materials.

Publications

Journals

Kafizas A, Ma Y, Pastor E, et al., 2017, Water Oxidation Kinetics of Accumulated Holes on the Surface of a TiO2 Photoanode: A Rate Law Analysis, Acs Catalysis, Vol:7, ISSN:2155-5435, Pages:4896-4903

Mesa CA, Kafizas A, Francas L, et al., 2017, Kinetics of Photoelectrochemical Oxidation of Methanol on Hematite Photoanodes, Journal of the American Chemical Society, Vol:139, ISSN:0002-7863, Pages:11537-11543

Kafizas A, Wang X, Pendlebury SR, et al., 2016, Where Do Photogenerated Holes Go in Anatase:Rutile TiO2? A Transient Absorption Spectroscopy Study of Charge Transfer and Lifetime, Journal of Physical Chemistry A, Vol:120, ISSN:1089-5639, Pages:715-723

Ma Y, Kafizas A, Pendlebury SR, et al., 2016, Photoinduced Absorption Spectroscopy of CoPi on BiVO4: The Function of CoPi during Water Oxidation, Advanced Functional Materials, Vol:26, ISSN:1616-301X, Pages:4951-4960

Ma Y, Mesa CA, Pastor E, et al., 2016, Rate Law Analysis of Water Oxidation and Hole Scavenging on a BiVO4 Photoanode, Acs Energy Letters, Vol:1, ISSN:2380-8195, Pages:618-623

More Publications