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Title: Direct observation of the energetics at a semiconductor/liquid junction by operando X-ray photoelectron spectroscopy

Journal Article · · Energy & Environmental Science
DOI:https://doi.org/10.1039/C5EE01014D· OSTI ID:1634114
 [1];  [1];  [1];  [2];  [2];  [3];  [3];  [2];  [4];  [5];  [6];  [7];  [1]
  1. California Institute of Technology (CalTech), Pasadena, CA (United States). Joint Center for Artificial Photosynthesis (JCAP)
  2. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Advanced Light Source (ALS)
  3. California Institute of Technology (CalTech), Pasadena, CA (United States). Joint Center for Artificial Photosynthesis (JCAP); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Advanced Light Source (ALS)
  4. Technical Univ. of Darmstadt (Germany)
  5. California Institute of Technology (CalTech), Pasadena, CA (United States). Joint Center for Artificial Photosynthesis (JCAP) and Beckman Inst.
  6. California Institute of Technology (CalTech), Pasadena, CA (United States). Joint Center for Artificial Photosynthesis (JCAP) and Kavli Nanoscience Inst.
  7. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Advanced Light Source (ALS); Chinese Academy of Sciences (CAS), Shanghai (China). Shanghai Inst. of Microsystem

Photoelectrochemical (PEC) cells based on semiconductor/liquid interfaces offer an approach of converting solar energy to electricity or fuels. Currently, the understanding of semiconductor/liquid interfaces is inferred from experiments and models. Operando ambient-pressure X-ray photoelectron spectroscopy (AP-XPS) has been used herein to directly characterize the semiconductor/liquid junction at room temperature under real-time electrochemical control. X-ray synchrotron radiation in conjunction with AP-XPS has enabled simultaneous monitoring of the solid surface, the solid/electrolyte interface, and the bulk electrolyte of a PEC cell as a function of the applied potential, U. The observed shifts in binding energy with respect to the applied potential have directly revealed ohmic and rectifying junction behavior on metallized and semiconducting samples, respectively. Additionally, the non-linear response of the core level binding energies to changes in the applied electrode potential has revealed the influence of defect-derived electronic states on the Galvani potential across the complete cell.

Research Organization:
California Institute of Technology (CalTech), Pasadena, CA (United States); Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
SC0004993; AC02-05CH11231
OSTI ID:
1634114
Journal Information:
Energy & Environmental Science, Vol. 8, Issue 8; ISSN 1754-5692
Publisher:
Royal Society of ChemistryCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 123 works
Citation information provided by
Web of Science

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Ambient Pressure Photoelectron Spectroscopy: Opportunities in Catalysis from Solids to Liquids and Introducing Time Resolution journal January 2018
Stabilizing the Meniscus for Operando Characterization of Platinum During the Electrolyte-Consuming Alkaline Oxygen Evolution Reaction journal October 2018
Various spectroelectrochemical cells for in situ observation of electrochemical processes at solid–liquid interfaces journal October 2018
Speciation and Electronic Structure of La1−xSrxCoO3−δ During Oxygen Electrolysis journal October 2018
An APXPS endstation for gas–solid and liquid–solid interface studies at SSRF journal April 2019
Unravelling the electrochemical double layer by direct probing of the solid/liquid interface journal August 2016
Developing a scalable artificial photosynthesis technology through nanomaterials by design journal December 2016
Strategies for enhancing the photocurrent, photovoltage, and stability of photoelectrodes for photoelectrochemical water splitting journal January 2019
Determination and optimization of material parameters of particle-based LaTiO 2 N photoelectrodes journal January 2018
Band structure engineering of boron–oxygen-based materials for efficient charge separation journal January 2019
The offset droplet: a new methodology for studying the solid/water interface using x-ray photoelectron spectroscopy journal October 2017
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Figures / Tables (5)