Transition metal nitrides are highly valued for their unique properties and diverse applications in coatings, lighting, and energy storage. However, achieving two-dimensional (2D) metal nitrides presents a significant challenge due to their strong atomic bonds. Here, we introduce a family of 2D multicomponent metal nitride, metal tungsten nitride (MWN2) nanosheets via precursor minimization and nitridation strategy. The composition of M and stoichiometric ratio can be easily modulated, and thus high-entropy (FeCoNiMn)WN2 nanosheets can be well produced. Prominently, the high-entropy MWN2 nanosheets demonstrate superior oxygen evolution with an overpotential of only 228 mV @10 mA cm-2 and exceptional stability, exhibiting a degradation rate of merely 15 µV h-1 over 1000 hours. Theoretical insights reveal that antisite defects substantially lower oxygen adsorption energy. This work sheds light on the highly active and stable catalytic properties of 2D metal nitrides for water oxidation.

中文翻译：

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二维高熵 MWN2 纳米片在碱性介质下促进水氧化


过渡金属氮化物因其独特的性能和在涂料、照明和储能方面的广泛应用而受到高度重视。然而，由于二维 （2D） 金属氮化物具有很强的原子键，因此实现二维 （2D） 金属氮化物是一项重大挑战。在这里，我们通过前驱体最小化和氮化策略介绍了一系列 2D 多组分金属氮化物、金属氮化钨 （MWN2） 纳米片。M 的组成和化学计量比可以很容易地被调制，因此可以很好地生产高熵 （FeCoNiMn）WN2 纳米片。突出的是，高熵 MWN2 纳米片表现出优异的析氧性，过电位仅为 228 mV @10 mA cm-2 和出色的稳定性，在 1000 小时内表现出仅 15 μV h-1 的降解率。理论见解表明，反位缺陷大大降低了氧吸附能。这项工作阐明了 2D 金属氮化物在水氧化中的高活性和稳定催化性能。