Chemical Behavior of Mo₂ TMB₂ (TM = Fe, Co, Ni) upon the Oxygen Evolution Reaction (OER).

IF 6.5 Q2 CHEMISTRY, PHYSICAL

ACS Materials Au Pub Date : 2025-06-24 eCollection Date: 2025-07-09 DOI:10.1021/acsmaterialsau.5c00035

Fatma Aras, Ulrich Burkhardt, Alim Ormeci, Horst Borrmann, Simone G Altendorf, Yuri Grin, Iryna Antonyshyn

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引用次数: 0

Abstract

The (electro)-chemical behavior of intermetallic compounds Mo₂ TMB₂ (TM = Fe, Co, Ni) under OER conditions has been investigated using electrochemical data combined with extensive bulk- and surface-sensitive material characterization. In situ formation of TM-rich amorphous layers, composed of oxides and hydroxides, accompanied by partial dissolution of molybdenum and boron, was observed for all three compounds. The degree of molybdenum and boron dissolution also influences the electronic state of TMs in their oxides/hydroxides formed on the surface of Mo₂ TMB₂. The in situ-formed Fe₂O₃ and Ni-(OH)₂ on the surface of Mo₂FeB₂ and Mo₂NiB₂, respectively, are the origin of surface passivation and their OER inactivity. At the same time, the simultaneous presence of Co₃O₄ and Co-(OH)₂ on the surface of an OER-exposed Mo₂CoB₂ electrode allows for the start of OER at a lower overpotential (ca. 290 mV) compared to elemental Co (ca. 370 mV), revealing better electrocatalytic activity. Extensive characterization of these materials as well as variation of the experimental conditions extends our understanding of the chemical properties of intermetallic compounds, which are of clear importance for their possible application as efficient electrocatalysts.

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Mo2 TMB2 （TM = Fe, Co, Ni）的析氧反应（OER）化学行为

利用电化学数据结合广泛的体敏和表面敏感材料表征，研究了金属间化合物Mo2 TMB2 （TM = Fe, Co, Ni）在OER条件下的（电）化学行为。在所有三种化合物中都观察到由氧化物和氢氧化物组成的富含tm的无定形层的原位形成，并伴有钼和硼的部分溶解。钼和硼的溶解程度也会影响TMs在Mo2 TMB2表面形成的氧化物/氢氧化物中的电子态。Mo2FeB2和Mo2NiB2表面原位形成的Fe2O3和Ni-(OH)2分别是表面钝化和OER失活的原因。同时，Co3O4和Co-(OH)2同时存在于OER暴露的Mo2CoB2电极表面，与单质Co（约370 mV）相比，OER的过电位（约290 mV）较低，显示出更好的电催化活性。这些材料的广泛表征以及实验条件的变化扩展了我们对金属间化合物化学性质的理解，这对于它们作为高效电催化剂的可能应用具有明显的重要性。

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来源期刊

ACS Materials Au 材料科学-

CiteScore

5.00

自引率

0.00%

发文量

期刊介绍： ACS Materials Au is an open access journal publishing letters articles reviews and perspectives describing high-quality research at the forefront of fundamental and applied research and at the interface between materials and other disciplines such as chemistry engineering and biology. Papers that showcase multidisciplinary and innovative materials research addressing global challenges are especially welcome. Areas of interest include but are not limited to:Design synthesis characterization and evaluation of forefront and emerging materialsUnderstanding structure property performance relationships and their underlying mechanismsDevelopment of materials for energy environmental biomedical electronic and catalytic applications