Recent Advances in Earth‐Abundant Photocathodes for Photoelectrochemical Water Splitting

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Abstract
The conversion of solar energy into hydrogen through photoelectrochemical (PEC) water splitting is an attractive way to store renewable energy. Despite the intriguing concept of solar hydrogen production, efficient PEC devices based on earth‐abundant semiconductors should be realized to compete economically with conventional steam reforming processes. Herein, recent milestones in photocathode development for PEC water splitting, particularly in earth‐abundant semiconductors, in terms of new techniques for enhancing performance, as well as theoretical aspects, are highlighted. In addition, recent research into newly emerging low‐cost p‐type semiconductors in the PEC field, such as Cu2BaSn(S,Se)4 and Sb2Se3, are scrutinized and the advantages and disadvantages of each material assessed.
Funding Information
  • National Research Foundation of Korea (2012R1A3A2026417)

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