Self‐Supported Oxygen and Molybdenum Dual‐Doped Cobalt Phosphide Hierarchical Nanomaterials as Superior Bifunctional Electrocatalysts for Overall Water Splitting. Issue 1 (11th November 2020)

• Record Type: Journal Article
• Authors: Mu, Jianshuai; Xu, Jiaying; Zhou, Chenmin; Wang, Qian; Wang, Xiu‐Guang; Liu, Zheng‐Yu; Zhao, Xiao‐Jun; Yang, En‐Cui
• Is Part Of: ChemElectroChem. Volume 8:Issue 1(2021)
• Page Start: 103
• Page End: 111
• Publication Date: 2020-11-11
• Subjects: dual doping -- cobalt phosphide -- hierarchical nanomaterials -- self-supported electrocatalyst -- overall water splitting; Electrochemistry -- Periodicals; 541.37
• DOI: 10.1002/celc.202001105
• Languages: English
• ISSNs: 2196-0216

Abstract

Abstract: 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. Abstract : Dual doping and 3D morphology : A novel self‐supported O and Mo dual‐doped CoP 3D hierarchical nanomaterial is fabricated for efficient electrocatalytic hydrogen evolution and oxygen evolution reactions. The superior activity originates from the synergistic effect of dual doping, and the unique 3D morphology. The O, Mo−CoP/nickel foam‐2 nanoflowers exhibit efficient overall water splitting with only 1.66 V for 100 mA cm −2, which is superior to the commercial Pt−C and RuO2 system.