1. A nickel complex of 2,2-dicyanoethylene-1,1-dithiolate, a catalyst for electrochemical and photochemical driven hydrogen evolution.
- Author
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Liu, Wei-Xia, Wang, Chun-Li, Lei, Jia-Mei, Zhan, Shu-Zhong, and Wu, Song-Ping
- Subjects
NICKEL catalysts ,HYDROGEN evolution reactions ,CATALYSTS ,NICKEL ,TURNOVER frequency (Catalysis) ,HYDROGEN ,ELECTRON donors ,INTERSTITIAL hydrogen generation - Abstract
The reaction of NiCl
2 , K2 (i-mnt) (i-mnt2− = 2,2-dicyanoethylene-1,1-dithiolate) and 1-benzyl-4-amino-pyridinium bromide [BzPyNH2 ]Br affords a nickel complex, [BzPyNH2 ]2 [Ni(i-mnt)2 ], a molecular catalyst for electrochemical and photochemical driven hydrogen evolution. As an electrocatalyst, [BzPyNH2 ]2 [Ni(i-mnt)2 ] can electrocatalyze hydrogen generation from a neutral buffer with a turnover frequency (TOF) of 556 (±3) mol of hydrogen per mole of catalyst per hour (mol H2 /mol catalyst/h) at an overpotential (OP) of 837.6 mV. As a photocatalyst, combining with CdS nanorods (CdS NRs) as a photosensitizer, and ascorbic acid (H2 A) as a sacrificial electron donor, [BzPyNH2 ]2 [Ni(i-mnt)2 ] photocatalyzes hydrogen evolution in heterogeneous environments with a turnover number (TON) of 18420 (±5) mol H2 per mol of catalyst during 60 h irradiation. The highest apparent quantum yield (AQY) is ∼10% at 469 nm. Several chemical and physical methods are employed to understand catalytic procedures for H2 production. [ABSTRACT FROM AUTHOR]- Published
- 2022
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