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Defect engineering is considered as an effective idea for regulating the electronic structure and surface geometric structure of both metal- and carbon-based electrocatalysts. Furthermore, those defects can also be regarded as efficient active sites or collaborate with the surrounding environment to offer unique physical/chemical properties and interactions between active centers and host/support materials. In this regard, a serial of practical defect engineering methods has been developed for the preparation of electrocatalysts for various electrocatalytic processes, including nitrogen reduction reaction (NRR), hydrogen reduction reaction (HER), oxygen reduction reaction (OER), and oxygen reduction reaction (ORR). Comparing with state-of-the-art noble metal catalysts, our fabricated catalysts are much lower in costs but in higher electrocatalytic performances.
Firstly, we adopted a Fe doping strategy to modify the surface atomic structure of W18O49 for effective NRR electrocatalysis a