期刊
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
卷 8, 期 26, 页码 9794-9802出版社
AMER CHEMICAL SOC
DOI: 10.1021/acssuschemeng.0c02309
关键词
oxygen evolution reaction; electrocatalyst; copper oxide; cobalt-doping; cuprous halides; hollow nanostructures
资金
- Ministry of Science and Technology of Taiwan [107-2113-M-002-015-MY3, 107-2113-M-019-004-MY3, 108-2638-M-002001-MY2, NS108-2811-M-002 -589]
In this work, we demonstrate a simple electrochemical approach to convert copper foil into a cost-effective and stable cobalt-doped hollow-structured CuBr@CuO electrocatalyst with high surface porosity for oxygen evolution reaction (OER). First, a thin layer of surface copper atoms of the foil was converted to gamma-CuBr nanocorals (NCs) by dissolution and in situ deposition in a bromide medium. Then, the CuBr NCs were doped with Co utilizing the high ionic mobility of Cu+ in the gamma-CuBr structure through cation exchange and dissolution reactions. During the Co-doping process, the surface gamma-CuBr was converted to Cu2O, leading to the formation of CuBr/Co@Cu2O NCs. CuBr/Co@Cu2O NCs were then converted to CuBr/Co@CuO hollow NCs (h-NCs), with high surface roughness and high stability by three linear sweep voltammetry (LSV) scans in O-2-saturated KOH solution (0.1 M) over a potential range of 1.2-1.7 V (vs RHE). The h-NC was not formed without Co-doping of gamma-CuBr. The as-formed CuBr/Co@CuO h-NCs exhibit an overpotential of 270 mV with a current density of 10 mA cm(-2) and a Tafel slope of 66 mV dec(-1) for OER as a result of having high electrochemically active surface area and synergistic catalytic Co and CuBr@CuO nanostructures.
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