Self-supported hollow nanoarrays with hierarchical pores and rich reaction sites are promising for advanced electrocatalysis. Herein, we report a rational design of novel CoS₂ nanotube arrays assembled on a flexible support which can be directly utilized as an efficient bifunctional electrocatalyst for overall water splitting. Uniform wire-like metal–organic framework (MOF) nanoarrays were first fabricated and a sulfidation process by thermal treatment was carried out to transform the MOF arrays into CoS₂ nanotube arrays. The unique hollow CoS₂ tubular arrays are shown to provide high surface area for an efficient electrochemical reaction, and the well-defined electrical/mechanical connection to the substrate enhances both mass and electron transfer. The CoS₂ nanotube arrays exhibited a high electrochemical activity in catalyzing both oxygen and hydrogen evolution reactions, in terms of low onset potential, high current density and excellent stability. Using the CoS₂ nanotube arrays as catalysts, a water-splitting current density of 10 mA cm⁻² in alkaline solution is achieved with a cell voltage of 1.67 V, and the stable current can be maintained for 20 h even when the electrode is in a bent state.

中文翻译：

---

金属-有机骨架衍生的空心CoS ₂纳米管阵列：用于整体水分解的高效双功能电催化剂

具有分层的孔和丰富的反应位点的自支撑空心纳米阵列有望用于先进的电催化。在此，我们报告了在柔性支撑体上组装的新型CoS ₂纳米管阵列的合理设计，该支撑体可直接用作整体水分解的有效双功能电催化剂。首先制造均匀的线状金属-有机骨架（MOF）纳米阵列，并通过热处理进行硫化处理，以将MOF阵列转变为CoS ₂纳米管阵列。独特的空心CoS ₂管状阵列显示出可提供高表面积，以进行有效的电化学反应，并且与基板的明确定义的电气/机械连接增强了质量和电子传递。CoS从低启动电位，高电流密度和出色的稳定性来看， _2个纳米管阵列在催化氧气和氢气的放出反应中均表现出很高的电化学活性。使用CoS ₂纳米管阵列作为催化剂，可在1.67 V的电池电压下在碱性溶液中实现10 mA cm ^-2的水分解电流密度，即使在电极处于加热状态下也可保持20 h的稳定电流。弯曲的状态。