In view of the large-scale production of hydrogen (H₂) by means of water electrolysis, it is of utmost importance to develop high-efficiency, stable and low-cost electrocatalysts. We report here on the synthesis and electrocatalytic properties of interconnected porous nanoflakes of the bimetallic catalyst CoMo₂S₄. These as-grown CoMo₂S₄ electrodes show higher electrocatalytic ability as compared to the reference CoMoO₆ material, requiring a low OER/HER overpotential of 306/162 mV to reach 10 mA cm⁻². We ascribe the excellent catalytic efficiency of our novel nanostructured CoMo₂S₄ catalyst to the combination of an increased number of active sites, enhanced charge transport properties, and a better contact at the CoMo₂S₄/electrolyte interface. When interconnected CoMo₂S₄ is used as a bifunctional catalyst in two-electrode electrolyzer cells, it maintains a voltage of 1.65 V to achieve 10 mA cm⁻² for at least 10 hours, thus opening a new route for the design of efficient, stable and low-cost catalysts.

中文翻译：

---

CoMo2S4的互连多孔纳米薄片，可作为一种有效的整体水电解双功能电催化剂

鉴于通过水电解的大规模生产氢（H ₂），开发高效，稳定和低成本的电催化剂至关重要。我们在这里报告双金属催化剂CoMo ₂ S ₄的互连多孔纳米薄片的合成和电催化性能。与参比的CoMoO ₆材料相比，这些生长的CoMo ₂ S ₄电极显示出更高的电催化能力，要求306/162 mV的低OER / HER过电势才能达到10 mA cm ^-2。我们将新型纳米结构CoMo ₂ S ₄的出色催化效率归因于催化剂结合增加的活性位点数量，增强的电荷传输性能以及在CoMo ₂ S ₄ /电解质界面处的更好接触。当互连的CoMo ₂ S ₄用作双电极电解槽中的双功能催化剂时，它保持1.65 V的电压至少10个小时即可达到10 mA cm ^-2，从而为高效设计开辟了一条新途径，稳定且低成本的催化剂。