Co-Catalysts on Photoelectrodes: Catalyst or Passivation?
James Thorne a, Wei Li a, Erik Liu a, Yanyan Zhao a, Dunwei Wang a
a Boston College, Department of Chemistry, Boston College, Chestnut Hill, MA, 2467, United States
Materials for Sustainable Development Conference (MATSUS)
Proceedings of nanoGe September Meeting 2017 (NFM17)
SF1: Material and Device Innovations for the Practical Implementation of Solar Fuels (SolarFuel17)
Barcelona, Spain, 2017 September 4th - 9th
Organizers: Wilson Smith and Ki Tae Nam
Invited Speaker, Dunwei Wang, presentation 008
Publication date: 20th June 2016

Photocatalysis has been recognized as a promising route toward large scale solar energy harvesting and storage but has been developing at a frustratingly low pace.  The lack of suitable materials is a key challenge that limit its development.  To address this issue and realize high-efficiency, low-cost photocatalysis, we need engineered materials with complex functionalities.  Understanding how the overall performance of a photocatalyst is influenced by the various material components, especially at the solid/liquid interface, has therefore become critically important.  Within this context, we present a systematic study aimed at understanding the detailed processes at the photocatalyst/water interface.  In particular, we will discuss whether the application of co-catalysts actually act through the purported mechanism of accelerating charge transfer.  To tease out information important to the understanding, we probed the system under quasi-equilibrium conditions as well as under operation conditions using spectroscopic techniques.  The study was carried out on three distinct material platforms, iron oxide, bismuth vanadate, and Si (with GaN nanowires).  Our results suggest that seemingly similar overall effect by the co-catalysts may be due to fundamentally different reasons.  The understanding has been shown to play critical roles in further optimization of photocatalysts.  We expect to see increasingly more important roles by similar studies on a wide range of photocatalyst systems.

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