Although some progress on exploring non-noble-metal based materials with remarkable activity for the electrocatalytic hydrogen or oxygen evolution reactions has been made, it still remains a critical challenge especially for overall water splitting. Herein, we report a facile synthesis of novel hierarchical MoP/NiFeP hybrid hollow spheres (MoP/NiFeP HSs) as an electrocatalyst for the first time. The obtained MoP/NiFeP HSs enable not only abundant accessible sites, but also facilitated electron transfer through the heterointerfaces and synergistically promoted kinetics. The optimal MoP/NiFeP HSs present efficient bifunctional electrocatalytic performance with low overpotentials of 73 and 256 mV to achieve 10 mA cm⁻² for the HER and OER in 1 M KOH, respectively. More importantly, when employed as electrocatalysts in a two-electrode device, low cell voltage of 1.51 V at 10 mA cm⁻² with long term durability can be achieved, comparable to the Ir/C-Pt/C couple and exceeding those of the recently reported typical bifunctional electrocatalysts. This work might inspire the design and preparation of highly active and low-cost hybrid materials with hierarchical structures for water splitting applications.

中文翻译：

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MoP / NiFeP分层空心球体作为高效的双功能电催化剂，可用于整体水分解

尽管在探索对电催化氢气或氧气逸出反应具有显着活性的非贵金属基材料方面取得了一些进展，但仍然仍然是一个严峻的挑战，特别是对于总的水分解。在这里，我们首次报道了新型的分层MoP / NiFeP混合空心球（MoP / NiFeP HSs）作为电催化剂的简便合成方法。所获得的MoP / NiFeP HS不仅能够实现丰富的可及位点，而且还促进了通过异质界面的电子转移和协同促进的动力学。最佳的MoP / NiFeP HS具有高效的双功能电催化性能，低过电势分别为73和256 mV，可实现10 mA cm ^-2分别用于1 M KOH中的HER和OER。更重要的是，当用作双电极设备中的电催化剂时，与Ir / C-Pt / C对相当并超过了Ir / C-Pt / C对，可实现10mA cm ^-2的1.51 V低电池电压和长期耐久性。最近报道了典型的双功能电催化剂。这项工作可能会启发设计和制备高活性，低成本的混合材料，该材料具有用于分水应用的分层结构。