{'fraction_non_alphanumeric': 0.023255813953488372, 'fraction_numerical': 0.006644518272425249, 'mean_word_length': 5.694444444444445, 'pattern_counts': {'":': 0, '<': 0, '<?xml version=': 0, '>': 0, 'https://': 0, 'lorem ipsum': 0, 'www.': 0, 'xml': 0}, 'pii_count': 0, 'substrings_counts': 0, 'word_list_counts': {'cursed_substrings.json': 0, 'profanity_word_list.json': 0, 'sexual_word_list.json': 0, 'zh_pornsignals.json': 0}}
Chapter 9. High Electrocatalytic Performance of Two-dimensional Layered MoS2-based Materials for the Hydrogen Evolution Reaction

Hydrogen, as a clean and low-cost energy source, has received great interest owing to its renewability and high energy density. Electrocatalytic water splitting is considered to be one of the most environmentally-friendly and economical strategies for the hydrogen evolution reaction (HER) in modern society. Two-dimensional (2D) layered molybdenum disulfide (MoS2) has attracted considerable interest as a substitute for noble metal catalysts due to its unexpected physical, electronic, chemical, and optical properties as well as its natural abundance. During recent years, a number of potential 2D layered MoS2-based electrocatalysts have been investigated for the HER. This chapter provides a summary of the current research and recent advances in 2D layered MoS2-based materials and an understanding of the high electrocatalytic performance in the HER. The corresponding electrocatalytic performance, critical issues, and current strategies for improving the performance for the HER are discussed and we finally outline the existing challenges and future opportunities.