Hydrogen evolution reaction (HER) has prospect to becoming clean and renewable technology for hydrogen production and Ni–Mo alloy is among the best HER catalysts in alkaline electrolytes. Here, an in situ topotactic reduction method to synthesize ultrathin 2D Ni–Mo alloy nanosheets for electrocatalytic hydrogen evolution is reported. Due to its ultrathin structure and tailored composition, the as‐synthesized Ni–Mo alloy shows an overpotential of 35 mV to reach a current density of 10 mA cm⁻², along with a Tafel slope of 45 mV decade⁻¹, demonstrating a comparable intrinsic activity to state‐of‐art commercial Pt/C catalyst. Besides, the vertically aligned assemble structure of the 2D NiMo nanosheets on conductive substrate makes the electrode “superaerophobic,” thus leading to much faster bubble releasing during HER process and therefore shows faster mass transfer behavior at high current density as compared with drop drying Pt/C catalyst on the same substrate. Such in situ topotactic conversion finds a way to design and fabricate low‐cost, earth‐abundant non‐noble metal based ultrathin 2D nanostructures for electrocatalytic issues.

中文翻译：

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原位全位还原还原制氢反应的超好氧超薄镍钼合金纳米片阵列

氢气析出反应（HER）有望成为生产氢气的清洁和可再生技术，镍钼合金是碱性电解质中最好的HER催化剂之一。在这里，报道了一种原位全能还原方法，用于合成超薄的二维Ni-Mo合金纳米片，用于电催化制氢。由于其超薄的结构和量身定制的成分，刚合成的Ni-Mo合金显示35 mV的过电势，以达到10 mA cm ^-2的电流密度，以及Tafel斜率达到45 mV十年^-1，证明其内在活性与最先进的商用Pt / C催化剂相当。此外，二维NiMo纳米片在导电基底上的垂直排列的组装结构使电极“具有超疏水性”，从而导致在HER过程中气泡释放更快，因此与液滴干燥Pt /相比，在高电流密度下表现出更快的传质行为。 C催化剂在同一基材上。这样的原位转化可以找到一种设计和制造低成本，富含地球的非贵金属基超薄2D纳米结构的方法，用于解决电催化问题。