Developing stable and efficient bifunctional catalysts for overall water splitting is a critical step in the production of renewable energy sources. Here we report a stable and highly active electrocatalyst comprised of NiCoSe_2-x/N-doped carbon mushroom-like core/shell nanorods on silk-derived carbon fiber through one step selenization. The unique one-dimensional nanorod structure facilitates the charge transport, and the N-doped carbon shell also increases the electrical conductivity, resulting in a remarkable enhancement of the catalytic activity. The N-doped carbon shell also functions as a protection layer. The composite catalyst therefore exhibits outstanding OER and HER performance, it can also stably drive the overall water splitting at a low cell voltage of 1.53 V in base solution. The present work provides an efficient strategy for the fabrication of stable and active electrocatalysts with earth-abundant elements.

开发用于整体水分解的稳定高效的双功能催化剂是生产可再生能源中的关键步骤。在这里，我们报告了由NiCoSe _2-x组成的稳定且高活性的电催化剂通过一步硒化作用，在源自碳的碳纤维上掺入/ N掺杂的碳蘑菇状核/壳纳米棒。独特的一维纳米棒结构有利于电荷传输，N掺杂碳壳还提高了电导率，从而显着提高了催化活性。N掺杂的碳壳还起到保护层的作用。因此，该复合催化剂表现出出色的OER和HER性能，它还可以在基础溶液中以1.53 V的低电池电压稳定驱动总水分解。本工作提供了一种有效的策略，用于制备稳定和活性高的，富含稀土元素的电催化剂。