Near-unity photocatalytic dehydrocoupling of thiophenols into disulfides and hydrogen using coupled CdS Nanorods and Ni-containing polyoxometalate
Simultaneously harnessing the photogenerated electrons and holes to convert thiols into the val-ue-added disulfides with the concomitant formation of H2 represents a highly promising strategy for maximizing the conversion of solar energy into chemical energy.Herein,we report an effective catalytic system comprising CdS nanorods(NRs)and Ni-containing polyoxometalate(Na6K4[Ni4(H2O)2(PW9O34)2](Ni4P2))(Ni4P2/CdS),which exhibited efficient photocatalytic activities towards the near-unity dehydrocoupling of 4-methoxythiophenol(4-MTP)into disulfide and H2 evolution.The photooxidative dehydrocoupling of 4-MTP can be finished after 4 h photocatalysis,leading to 98.39％conversion of 4-MTP with the yield of disulfide and H2 reaching 24.45 and 25.96μmol,respectively.The Ni4P2/CdS catalytic system also showed good photocatalytic recycling sta-bility.Comprehensive experimental and characterization results indicated that the synergistic co-operation between CdS NRs and Ni4P2 facilitated the separation and migration of the photogener-ated electron-hole pairs,thereby improving the photocatalytic dehydrocoupling of 4-MTP to disul-fide coupling with hydrogen production.
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