Electrocatalytic nitrogen fixation in an aqueous solution is considered a promising approach to ammonia synthesis. Still, this process has low Faraday efficiency and ammonia yield, so it is necessary to develop an efficient, clean, and safe catalyst to promote nitrogen reduction process. Doping can be easily carried out during the crystal growth owing to the weak interaction between the sandwiched layers (due to van der Waals forces) of MoS. Here, a Ni-P codoped MoS nanosheets is designed as a highly efficient catalyst for electrochemical nitrogen fixation with superior selectivity. Especially, the doping of Ni achieved the transformation of MoS from 2 H phase to 1 T phase, improving the conductivity of the material. In addition, the doping of P creates more sulfur vacancies in the catalyst, thereby producing more H*, which promotes the adsorption and activation of nitrogen. The as-synthesized Ni-P codoped MoS nanosheets show excellent catalytic performance with a high yield of electrocatalytic ammonia synthesis (84.29 μg h mg) and Faraday efficiency (2.39 %) at −0.5 V versus reversible hydrogen electrode in acidic electrolytes (0.005 M HSO), which outperformed most electrocatalytic ammonia synthesis catalysts. Furthermore, the Ni-P codoped MoS catalyst also shows outstanding electrochemical stability and durability. This work may offer a hopeful lead for designing effective non-noble-metal NRR electrocatalysts.

中文翻译：

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促进 Ni-P 共掺杂 MoS2 纳米片的电催化固氮

水溶液中的电催化固氮被认为是一种有前途的氨合成方法。但该过程法拉第效率和氨收率较低，因此有必要开发高效、清洁、安全的催化剂来促进氮还原过程。由于MoS夹层之间的相互作用（由于范德华力）较弱，因此在晶体生长过程中可以很容易地进行掺杂。在这里，Ni-P共掺杂MoS纳米片被设计为具有优异选择性的电化学固氮高效催化剂。特别是Ni的掺杂实现了MoS从2H相向1T相的转变，提高了材料的电导率。此外，P的掺杂在催化剂中产生更多的硫空位，从而产生更多的H*，促进氮的吸附和活化。所合成的 Ni-P 共掺杂 MoS 纳米片表现出优异的催化性能，与酸性电解质（0.005 M HSO）中的可逆氢电极相比，-0.5 V 时电催化氨合成产率高（84.29 μg h mg）和法拉第效率（2.39%） ），其性能优于大多数电催化氨合成催化剂。此外，Ni-P共掺杂MoS催化剂还表现出出色的电化学稳定性和耐久性。这项工作可能为设计有效的非贵金属 NRR 电催化剂提供有希望的指导。