Tuning Surface Structure of Au-Ag Alloy for Electrochemical Reduction of N2 into NH3
The efficient and economical conversion of nitrogen into ammonia plays a significant role in human production.The electrocatalytic reduction process is considered as one of the potential technologies for ammonia synthesis.In this study,the alloy cage-encapsulated gold nanorods(CGNRs)with varying proportions of AuAg alloy were prepared.The influence of different AuAg alloy ratios on the electrocatalytic nitrogen fixation performance of CGNRs nanostructure was investigated,and the mechanism of electrocatalytic ammonia synthesis was also explored.CGNRs outer shells were composed of AuAg alloy.Remarkably,CGNR14 with the cage Ag/Au ratio of 0.06 exhibited the most outstanding yield(22.7 μg·mg‒1cat·h‒1)and Faraday efficiency(11.2%)in the electrocatalytic ammonia synthesis.Simulated calculations further confirmed that the alloy effect induced alterations in the electronic states and lattice constants of the outer cage,thereby accelerating the kinetics of nitrogen reduction and ultimately enhancing the overall performance of ammonia synthesis.
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