TY - JOUR
T1 - Fabrication of Flower-like Rhodium-Doped β-Ni(OH)2 as an Efficient Electrocatalyst for Methanol Oxidation Reaction in Alkaline Media
AU - Wang, Yafeng
AU - Luo, Xian
AU - Lu, Wenjie
AU - Huang, Bin
AU - Yang, Yanqing
N1 - Publisher Copyright:
© 2022 American Chemical Society.
PY - 2023/1/10
Y1 - 2023/1/10
N2 - In this study, β-Ni(OH)2 with a unique flower-like morphology was synthesized through a hydrothermal method. The doping of Rh in β-Ni(OH)2 was achieved by a reduction method. The as-synthesized catalysts were characterized by X-ray diffraction, transmission electron microscopy, and X-ray photoelectron spectroscopy for the crystal structure, morphology, composition, and chemical state analysis. The electrochemical tests revealed that the doping of Rh can significantly increase the electrocatalytic performance of β-Ni(OH)2 in 1.0 M KOH solution. The methanol oxidation peak current density of Rh-doped β-Ni(OH)2 reached 95 mA cm-2 with a Tafel slope of 40 mV dec-1. The reason for these improvements is that Rh can suppress the phase transformation of NiOOH from β to α. Meanwhile, the electronic structure change of nickel in β-Ni(OH)2 and the defect ratio increase caused by Rh doping are beneficial to methanol oxidation reaction (MOR) catalytic activity. Furthermore, the synergistic effect between Rh and Ni(OH)2 improved the surface activity of β-NiOOH. The doping of Rh in β-Ni(OH)2 is initiative in this work, which provides a new strategy to design highly efficient and cost-effective MOR electrocatalysts for alkaline DMFCs.
AB - In this study, β-Ni(OH)2 with a unique flower-like morphology was synthesized through a hydrothermal method. The doping of Rh in β-Ni(OH)2 was achieved by a reduction method. The as-synthesized catalysts were characterized by X-ray diffraction, transmission electron microscopy, and X-ray photoelectron spectroscopy for the crystal structure, morphology, composition, and chemical state analysis. The electrochemical tests revealed that the doping of Rh can significantly increase the electrocatalytic performance of β-Ni(OH)2 in 1.0 M KOH solution. The methanol oxidation peak current density of Rh-doped β-Ni(OH)2 reached 95 mA cm-2 with a Tafel slope of 40 mV dec-1. The reason for these improvements is that Rh can suppress the phase transformation of NiOOH from β to α. Meanwhile, the electronic structure change of nickel in β-Ni(OH)2 and the defect ratio increase caused by Rh doping are beneficial to methanol oxidation reaction (MOR) catalytic activity. Furthermore, the synergistic effect between Rh and Ni(OH)2 improved the surface activity of β-NiOOH. The doping of Rh in β-Ni(OH)2 is initiative in this work, which provides a new strategy to design highly efficient and cost-effective MOR electrocatalysts for alkaline DMFCs.
UR - http://www.scopus.com/inward/record.url?scp=85144778748&partnerID=8YFLogxK
U2 - 10.1021/acs.langmuir.2c02673
DO - 10.1021/acs.langmuir.2c02673
M3 - 文章
C2 - 36548983
AN - SCOPUS:85144778748
SN - 0743-7463
VL - 39
SP - 423
EP - 432
JO - Langmuir
JF - Langmuir
IS - 1
ER -