Self‐Supported Oxygen and Molybdenum Dual‐Doped Cobalt Phosphide Hierarchical Nanomaterials as Superior Bifunctional Electrocatalysts for Overall Water Splitting,ChemElectroChem

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Self‐Supported Oxygen and Molybdenum Dual‐Doped Cobalt Phosphide Hierarchical Nanomaterials as Superior Bifunctional Electrocatalysts for Overall Water Splitting
ChemElectroChem ( IF 3.5 ) Pub Date : 2020-10-19 , DOI: 10.1002/celc.202001105
Jianshuai Mu ₁ , Jiaying Xu ₁ , Chenmin Zhou ₁ , Qian Wang ₁ , Xiu‐Guang Wang ₁ , Zheng‐Yu Liu ₁ , Xiao‐Jun Zhao _{1,

2} , En‐Cui Yang _{1,

2}

Affiliation

Electrocatalytic water splitting is considered an attractive way to achieve clean and sustainable energy production. Herein, a series of self‐supported oxygen and molybdenum dual‐doped cobalt phosphides grown on Ni foam (O,Mo−CoP/NFs) were prepared. The O,Mo−CoP/NFs exhibited 3D hierarchical morphologies including urchin‐like nanostructures assembled with nanorods and nanoflowers assembled with ultrathin nanosheets. The optimized O,Mo−CoP/NFs‐2 nanoflowers exhibited superior electrocatalytic performance for the hydrogen evolution reaction (HER) and oxygen evolution reaction (OER), with an overpotential of only 59 mV at 10 mA cm⁻² for HER and 301 mV overpotential at 100 mA cm⁻² for OER. Moreover, the O,Mo−CoP/NFs‐2 nanoflowers exhibited efficient overall water splitting as low as 1.66 V for 100 mA cm⁻² with outstanding long‐term stability, even superior to the commercial Pt−C/NF and RuO₂/NF system. The superior activity of self‐supported O,Mo−CoP/NFs‐2 nanoflowers was attributed to the synergistic effect of O and Mo dual doping, which promoted its intrinsic catalytic activity, and its particular morphology of self‐supported 3D hierarchical nanoflowers, which could expose more catalytic sites and enable facile gas escape. Moreover, the device of overall water splitting can be powered by a single AA battery or a 1.5 V solar cell, showing its great potential for practical applications.

中文翻译：

自支撑氧和钼双掺杂磷化钴分层纳米材料，是用于整体水分解的优质双功能电催化剂

电催化水分解被认为是实现清洁和可持续能源生产的一种有吸引力的方法。在此，制备了一系列在镍泡沫（O，Mo-CoP / NFs）上生长的自支撑氧和钼双掺杂的钴磷化物。O，Mo-CoP / NFs呈现3D分层形态，包括用纳米棒组装的顽童状纳米结构和用超薄纳米片组装的纳米花。优化的O，Mo-CoP / NFs-2纳米花对氢气析出反应（HER）和氧气析出反应（OER）表现出优异的电催化性能，在10 mA cm ^-2时的过电势只有59 mV，HER和301 mV 100 mA cm ^-2时过电势用于OER。此外，O，Mo-CoP / NFs-2纳米花对100 mA cm ^-2表现出有效的总水分解低至1.66 V，具有出色的长期稳定性，甚至优于商用Pt-C / NF和RuO ₂ / NF系统。自支撑的O，Mo-CoP / NFs-2纳米花的卓越活性归因于O和Mo双重掺杂的协同作用，这促进了其固有的催化活性，以及自支撑的3D分层纳米花的特殊形态，从而可能会暴露出更多的催化部位，并使逸出的气体逸出。此外，整个水分解装置可以由单个AA电池或1.5 V太阳能电池供电，显示出其在实际应用中的巨大潜力。

更新日期：2020-10-19

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