Transition metal (Ni, co)-doped graphitic carbon nitride/MoS2 heterojunctions as efficient photocatalysts for hydrogen evolution reaction under visible light
INTERNATIONAL JOURNAL OF ENERGY RESEARCH, cilt.46, sa.12, ss.17189-17203, 2022 (SCI-Expanded, Scopus)
- Yayın Türü: Makale / Tam Makale
- Cilt numarası: 46 Sayı: 12
- Basım Tarihi: 2022
- Doi Numarası: 10.1002/er.8382
- Dergi Adı: INTERNATIONAL JOURNAL OF ENERGY RESEARCH
- Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Academic Search Premier, PASCAL, Aerospace Database, Aquatic Science & Fisheries Abstracts (ASFA), Communication Abstracts, Compendex, Environment Index, INSPEC, Metadex, Pollution Abstracts, Civil Engineering Abstracts
- Sayfa Sayıları: ss.17189-17203
- Anahtar Kelimeler: doping, graphitic carbon nitride, heterojunction, hydrogen evolution reaction, molybdenum disulfide, photocatalyst, Z-SCHEME, MOLYBDENUM-DISULFIDE, GRAPHENE OXIDE, MOS2, NANOSHEETS, G-C3N4, NANOPARTICLES, NANOCOMPOSITES, OPTIMIZATION, COCATALYST
- Atatürk Üniversitesi Adresli: Evet
Özet
New photocatalysts comprising the 2D/2D heterojunction of graphitic carbon nitride (gCN) and molybdenum disulfide (MoS2) semiconductors doped with nickel (Ni) or cobalt (Co), denoted as gCN/MoS2-M (M: Ni, Co), were fabricated for the photocatalytic hydrogen evolution reaction (HER) under visible light illumination. First, the binary gCN/MoS2 heterojunctions were fabricated by using an in-situ solvothermal method and then they were doped with Ni or Co via a chemical reduction method. The photocatalytic HER experiments revealed that the prepared gCN/MoS2-M (M: Ni, Co) photocatalysts showed enhanced HER activities and stabilities compared to pristine gCN and binary gCN/MoS2 heterojunctions. Total H-2 productions of 5924 mu mol g(cat)(-1) and 5159 mu mol g(cat)(-1) in 8 hours were provided by using gCN/MoS2-Ni and gCN/MoS2-Co photocatalysts, respectively, under visible light illumination. The detailed structural characterization and examination of optical properties of gCN/MoS2-M (M: Ni, Co) photocatalysts revealed that their enhanced photocatalytic activities were attributed to the formation of 'type-I' 2D/2D heterojunction between gCN and MoS2 semiconductors and the creation of S-deficient MoS2 nanostructures after Ni or Co doping, which promoted the separation of the photogenerated electron-hole pairs, the charge mobility, and the visible light absorption.