复合Fe-Ag/rGO催化剂的制备及其电催化氮还原性能研究

The Preparation of Composite Fe-Ag/rGO Catalyst and Its Performance of Electrocatalytic Reduction of Nitrogen

氨是重要的无机化工产品和清洁能源载体。合成氨的工业方法—哈伯工艺存在能耗高且释放大量CO 2温室气体等问题。电催化氮还原合成氨因反应条件温和、能耗低、绿色环保而得到广泛关注,该过程急需开发兼具成本低廉、高导电性、高活性、高选择性等特点的复合催化剂。本文首先制备了氧化石墨烯(GO),然后采用一步化学还原法制备了以还原氧化石墨烯(rGO)为载体的Fe-Ag/rGO复合双金属催化剂以及Fe/rGO、Ag/rGO两种单金属催化剂,采用SEM、EDS和XRD对其微观形貌、元素组成以及晶相结构进行了表征,最后,对比了Fe-Ag/rGO复合双金属催化剂以及Fe/rGO、Ag/rGO两种单金属催化剂的电催化氮还原合成氨性能。

Ammonia is an important inorganic chemical product and a clean energy carrier.The Haber process which is the predominant synthesis method of ammonia in in industry has the disadvantages of high energy consumption and environment problem like great CO_(2) emission.Ammonia synthesis through electrocatalytic reduction of nitrogen has attracted more and more attention due to its merits of mild reaction condition,low energy consumption and no greenhouse gas emission.Developing composite catalysts having the merits of low lost,good conductivity,good catalytic activity and selectivity is urgent to electrocatalytic reduction of nitrogen.In this work,graphene oxide(GO)was first prepared and then the composite catalyst Fe-Ag/rGO and two single metal catalysts Fe/rGO and Ag/rGO with reduced graphene oxide(rGO)as the support were prepared by a one-step chemical reduction method.The microstructure,element composition and crystal structure of the three catalysts were characterized by SEM,EDS,XRD,respectively.Finally,the catalytic performance of the catalysts Fe-Ag/rGO,Fe/rGO and Ag/rGO for electrocatalytic reduction of nitrogen was investigated and compared.