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Ammonia is an important chemical raw material, widely used in industry and agriculture, as well as an important energy storage intermediate and carbon‐free energy carrier. But, its production is limited to the traditional Haber‐Bosch process. Recently, electrochemical reduction of N2 has been attracting more and more attention, owing to the lower energy consumption and because it is environmentally friendly. However, there are a lot of problems that remain to be solved, and the main challenges are the low selectivity and catalytic activity when using this process. In this Review, we first summarize the recent development of electrocatalysts for electrochemical N2 reduction and elaborate on the reaction mechanisms of the nitrogen reduction reaction (NRR). In addition, the effects of different types of electrolyte on the NRR activity and electrolyte choice are discussed. Finally, the perspectives of electrochemical nitrogen reduction for conversion to ammonia are discussed.

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Considering consumers are increasingly shopping online nowadays and the online sales market is dominated by e‐commerce giants, traditional retailers need to choose whether to enter e‐commerce platforms. Moreover, traditional retailers need to determine whether to offer offline return services considering online return services are very popular. To address these challenges, we explore a retailer's optimal offline return strategy and channel choice of whether or not to enter a platform in the contexts of symmetric information and asymmetric information, respectively. We present conditions for the retailer to share information. Interestingly, we find that the retailer in some conditions has no motivation to improve customer satisfaction rate of offline store. Most important, we find that the retailer's channel choice depends on the magnitude of the annual service fee that is affected by offline return strategy and asymmetric information, and the offline return strategy depends on the magnitude of the average residual value of returned products.

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