Hydrogen peroxide production through the electrochemical two-electron oxygen reduction presents a compelling alternative to the anthraquinone process due to the cheap starting materials and low operating temperature and pressure. Transition metal species featuring with multi-active sites, offer high electrochemical activity and selectivity. MXenes, distinguished by excellent electrical conductivity and the two-dimensional structure facilitating smooth ion transportation, further enhance the prospects of this production approach. In this study, three Mo-based MXenes were synthesized: MoTiCF, MoTiCF and MoCF. Among these, MoTiCF emerged as the most promising catalyst for 2eORR, achieving a remarkable HO yield of up to 0.54 mol·g·h. Moreover, it also exhibits a high HO selectivity ranging from 81.3 % at 0.2 V to 94.1 % at 0.6 V vs. RHE, coupled with an impressive faradaic efficiency of 76.4 % at 0.4 V using H-cell. Further analysis indicates that the superior 2eORR performance can be attributed to the presence of metallic Mo on the surface of MoTiCF.

中文翻译：

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钼基 MXenes 作为高选择性双电子氧还原催化剂用于 H2O2 生产


由于廉价的起始材料和较低的操作温度和压力，通过电化学双电子氧还原生产过氧化氢是蒽醌工艺的一种引人注目的替代方案。过渡金属物种具有多活性位点，具有高电化学活性和选择性。 MXenes 具有优异的导电性和有利于离子顺利传输的二维结构，进一步增强了这种生产方法的前景。在这项研究中，合成了三种钼基 MXene：MoTiCF、MoTiCF 和 MoCF。其中，MoTiCF成为最有前途的2eORR催化剂，其H2O产率高达0.54 mol·g·h。此外，它还表现出高 H2O 选择性，范围从 0.2 V 时的 81.3% 到 0.6 V 时的 94.1%（相对于 RHE），再加上使用 H 电池时 0.4 V 时令人印象深刻的 76.4% 的法拉第效率。进一步分析表明，优异的2eORR性能可归因于MoTiCF表面金属Mo的存在。