Portal de Periódicos da CAPES

High-Valence-State NiO/Co 3 O 4 Nanoparticles on Nitrogen-Doped Carbon for Oxygen Evolution at Low Overpotential

2017; American Chemical Society; Volume: 2; Issue: 9 Linguagem: Inglês

10.1021/acsenergylett.7b00691

2380-8195

Muhammad Tahir, Lun Pan, Rongrong Zhang, Yicheng Wang, Guoqiang Shen, Imran Aslam, M. A. Qadeer, Nasir Mahmood, Wei Xu, Li Wang, Xiangwen Zhang, Ji‐Jun Zou,

Advanced battery technologies research

The electrocatalytic oxygen evolution reaction (OER) plays a critical role in sustainable energy conversion and storage, but OER is severely hampered owing to the lack of highly efficient catalysts. Here, we report an efficient electrocatalyst, with NiO/Co3O4 nanoparticles decorated on nitrogen-doped carbon (NiO/Co3O4@NC). Abundant high-valence Ni3+ and Co3+ species were observed on the surface of the hybrid due to the strong NC–metal oxide and NiO–Co3O4 interactions. This unique structure leads to excellent OER performance, delivering a very low overpotential of 240 mV@10 mA·cm–2 on glassy carbon and 200 mV@10 mA·cm–2 on Ni foam in KOH and having a turnover frequency (@350 mV overpotential) 6 and 16 times higher than that of IrO2 and RuO2, respectively.