TY - JOUR
T1 - Cocatalyst-free Photocatalytic Hydrogen Evolution with Simple Heteroleptic Iridium(III) Complexes
AU - Bodedla, Govardhana Babu
AU - Tritton, Daniel Nnaemaka
AU - Chen, Xi
AU - Zhao, Jianzhang
AU - Guo, Zeling
AU - Leung, Ken Cham-Fai
AU - Wong, Wai Yeung
AU - Zhu, Xunjin
N1 - Funding Information:
The research was supported by Hong Kong Research Grants Council (HKBU 12304320). K.C.-FL. thanks the State Key Laboratory of Environmental and Biological Analysis and The President’s Award for Outstanding Performance in Research Supervision to K.C.-F.L.. W.-Y.W. acknowledges the financial support from Hong Kong Research Grants Council (PolyU 153058/19P), the National Natural Science Foundation of China (51873176), the Hong Kong Polytechnic University (1-ZE1C), Clarea Au for the Endowed Professorship in Energy (847S), and the Research Institute for Smart Energy (RISE).
PY - 2021/4/26
Y1 - 2021/4/26
N2 - A simple heteroleptic iridium(III) photosensitizer, Ir-1, containing two ligands 5-(trifluoromethyl)-2-phenylpyridine (C-N-CF3) and bipyridine (N-N) has for the first time been studied for cocatalyst-free photocatalytic hydrogen evolution (PHE). The complex Ir-1 produces a hydrogen production rate (H2) of 3.2 mmol g-1 h-1, which is over 3.6-fold higher than that of the control complex Ir-2 (0.9 mmol g-1 h-1) containing bipyridine and 2-phenylpyridine ligands without CF3 groups. The higher H2 of Ir-1 could be ascribed to the high light-harvesting property, longer triplet electron lifetime, and more appropriate driving force for accepting electrons from the sacrificial donor, which enable efficient charge separation and transfer of electrons for hydrogen evolution. Additionally, the photostability issues of Ir-1 and Ir-2 are addressed by the selection of suitable organic solvent/water photocatalytic systems.
AB - A simple heteroleptic iridium(III) photosensitizer, Ir-1, containing two ligands 5-(trifluoromethyl)-2-phenylpyridine (C-N-CF3) and bipyridine (N-N) has for the first time been studied for cocatalyst-free photocatalytic hydrogen evolution (PHE). The complex Ir-1 produces a hydrogen production rate (H2) of 3.2 mmol g-1 h-1, which is over 3.6-fold higher than that of the control complex Ir-2 (0.9 mmol g-1 h-1) containing bipyridine and 2-phenylpyridine ligands without CF3 groups. The higher H2 of Ir-1 could be ascribed to the high light-harvesting property, longer triplet electron lifetime, and more appropriate driving force for accepting electrons from the sacrificial donor, which enable efficient charge separation and transfer of electrons for hydrogen evolution. Additionally, the photostability issues of Ir-1 and Ir-2 are addressed by the selection of suitable organic solvent/water photocatalytic systems.
KW - cocatalyst-free
KW - iridium(III) complex
KW - photocatalytic hydrogen evolution
KW - photostability and reductive quenching
UR - http://www.scopus.com/inward/record.url?scp=85104928457&partnerID=8YFLogxK
U2 - 10.1021/acsaem.1c00318
DO - 10.1021/acsaem.1c00318
M3 - Article
AN - SCOPUS:85104928457
SN - 2574-0962
VL - 4
SP - 3945
EP - 3951
JO - ACS Applied Energy Materials
JF - ACS Applied Energy Materials
IS - 4
ER -
