S element-doped synergistically well-mixed MOFs as highly efficient oxygen precipitation electrocatalyst

• Published in: International journal of hydrogen energy 2020-09, Vol.45 (46), p.24333-24340
• Main Authors: Guan, Hongxin, Wang, Na, Feng, Xuanxuan, Bian, Shaokang, Liu, Yaqing, Ma, Mengnan, Li, Wei, Chen, Yan
• Format: Article
• Language: English
• Subjects: Catalyst; Electrochemistry; MOFs; OER; Sulfur doping
• ISSN: 0360-3199; 1879-3487
• DOI: 10.1016/j.ijhydene.2020.06.276

The design of satisfied catalytic activity and stable catalysts for the oxygen evolution reaction (OER) is crucial in the production of hydrogen in electrolyzed water. Herein, S-doping NiCo-metal organic framework (NiCoS-MOF) were prepared successfully in situ on a nickel foamed (NF) substrate by used terephthalic acid (TPA) as an organic ligand via the original one-step solvothermal process, NiCoS-MOF reveals the electrocatalytic performance by the low overpotential of 71 mV at 10 mA cm−2 and the tafel slope of 74.4 mV dec−1 under alkaline condition (1 M KOH) served as OER electrodes directly. The i-t curve for 48 h at 1.50 and 2.14 V (vs.REH) showed excellent stability of NiCoS-MOF and the structure had no significant collapse after 1000 cycles. Superior OER activity and excellent stability could ascribed to the fluffy and orderly petal-like structure, which exhibited dispersal of the active sites and facilitated the evolution of oxygen during the catalysis process. The work enriched exploration of heteroatom-doped bimetallic MOFs in energy storage and conversion. •S-doped NiCo bimetallic MOF synthesized by One-step facile solvothermal method.•The OER overpotential at 100 mA/cm−2 is 247 mv.•The robust petal-like fluffy ordered structure enhanced the stability.