A novel bimetal cluster [AuCu(SR)](PPh) (SR = 2,4-dichlorothiophenol) has been successfully synthesized, which can be viewed as a Au@Au core and four trimeric Cu(SR) staples. Compared to monometallic Au(TBBT) and Cu(CHT)(PPh) clusters, the [AuCu(CHClS)](PPh) cluster has much higher catalytic efficiency for nitrate electroreduction to ammonia.
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