In recent years, metal-rich sulfides of the pentlandite type (M₉S₈) have attracted considerable attention for energy storage applications. However, common synthetic routes towards pentlandites either involve energy intensive high temperature procedures or solvothermal methods with specialized precursors and non-sustainable organic solvents. Herein, we demonstrate that ball milling is a simple and efficient method to synthesize nanosized bimetallic pentlandite particles (Fe_4.5Ni_4.5S₈, Pn) with an average size of ca. 250 nm in a single synthetic step from elemental- or sulfidic mixtures. We herein highlight the effects of the milling ball quantity, precursor types and milling time on the product quality. Along this line, Raman spectroscopy as well as temperature/pressure monitoring during the milling processes provide valuable insights into mechanistic differences between the mechanochemical Pn-formation. By employing the obtained Pn-nanosized particles as cathodic electrocatalysts for water splitting in a zero-gap PEM electrolyzer we provide a comprehensive path for a potential sustainable future process involving non-noble metal catalysts.

中文翻译：

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通过机械化学可持续快速制备纳米铁/镍镍黄铁矿颗粒

近年来，镍黄铁矿型（M ₉ S ₈）富金属硫化物在储能应用中引起了广泛关注。然而，镍黄铁矿的常见合成路线要么涉及能源密集型高温程序，要么涉及使用特殊前体和不可持续有机溶剂的溶剂热方法。在此，我们证明球磨是一种简单有效的合成纳米双金属镍黄铁矿颗粒（Fe _4.5 Ni _4.5 S ₈，Pn）的方法，平均尺寸约为。250 nm 在单一合成步骤中从元素或硫化物混合物中获得。我们在此强调研磨球数量、前体类型和研磨时间对产品质量的影响。沿着这条线，拉曼光谱以及铣削过程中的温度/压力监测为机械化学 Pn 形成之间的机械差异提供了有价值的见解。通过使用所获得的 Pn 纳米颗粒作为零间隙 PEM 电解槽中水分解的阴极电催化剂，我们为涉及非贵金属催化剂的潜在可持续未来工艺提供了一条全面的路径。