Recently, oxygen vacancy engineering represents a new direction for rational design of high-performance catalysts for electrochemical CO₂ reduction (CO₂RR). In this work, a series of amorphous MnO_x catalysts with different concentrations of oxygen vacancies, namely, low (a-MnO_x-L), pristine (a-MnO_x-P), and high oxygen vacancy (a-MnO_x-H), have been prepared by simple plasma treatments. The resultant a-MnO_x-H catalyst with a larger amount of oxygen vacancy on the catalyst surface is able to preferentially convert CO₂ to CO with a high Faradaic efficiency of 94.8% and a partial current density of 10.4 mA cm^-2 even at a relatively lower overpotential of 510 mV. On the basis of detailed experimental results and theoretical density functional theory (DFT) calculations, the enhancement of CO production is attributable to the abundant oxygen vacancies formed in the amorphous MnO_x which should favor CO₂ adsorption/activation and promote charge transfer with the catalyst for efficient CO₂ reduction.

最近，氧空位工程表示用于电化学CO的高性能催化剂合理设计新的方向₂还原（CO ₂ RR）。在这项工作中，一系列无定形的MnO _X用不同浓度的氧空位，即，低（A-的MnO催化剂_X -L），原始（α-MnO的_X -P），和高的氧空位（A-MnO的_X - H），已经通过简单的等离子体处理制备。将所得的α-MnO的_X -H催化剂具有氧空位的催化剂表面上的较大的量是能够优先将CO ₂以CO为94.8％的高法拉第效率和10.4毫安厘米的局部电流密度^-2即使在相对较低的510 mV过电位下也是如此。根据详细的实验结果和理论密度泛函理论（DFT）计算，CO产量的增加归因于非晶态MnO _x中形成的大量氧空位，这些空位应有利于CO ₂吸附/活化并促进催化剂的电荷转移。用于有效减少CO ₂。