过电位
催化作用
材料科学
X射线光电子能谱
傅里叶变换红外光谱
六亚甲基四胺
扫描电子显微镜
结晶度
析氧
化学工程
电化学
核化学
分析化学(期刊)
化学
物理化学
电极
复合材料
有机化学
工程类
作者
Qingqing Zha,Xu Wang,Xiaolei Li,Yonghong Ni
出处
期刊:Dalton Transactions
[The Royal Society of Chemistry]
日期:2019-01-01
卷期号:48 (32): 12127-12136
被引量:37
摘要
Hollow α-Co(OH)2 and Cl-doped α-Co(OH)2 nano-dodecahedrons were successfully synthesized via a ZIF-67-assisted template route in the absence/presence of NaCl. The reactions were carried out in a Teflon-lined stainless-steel autoclave at 40 °C for 4 h, employing dodecahedral ZIF-67 and hexamethylenetetramine (HMT) as the reactants. The as-obtained hollow nano-dodecahedrons were characterized by X-ray powder diffraction (XRD), field emission scanning electron microscopy (FESEM), transmission electron microscopy (TEM), Fourier transform infrared (FTIR), X-ray photoelectron energy, EDS mapping and N2 sorption-desorption technologies. Electrochemical measurements showed that both α-Co(OH)2 and Cl-doped α-Co(OH)2 hollow nano-dodecahedrons displayed excellent catalytic activities for the oxygen evolution reaction (OER) and Cl-doped α-Co(OH)2 hollow ones possessed stronger electrocatalytic performances. To deliver a current density of 10 mA cm-2, Cl-doped α-Co(OH)2 hollow nano-dodecahedrons required a low overpotential of 298 mV, which is smaller than most reported α-Co(OH)2 catalysts. Also, the as-obtained hollow catalyst still had excellent OER cycling stability and durability. After 1000 CV cycles, the overpotential merely slightly increased. Continuously catalyzing at the current density of 10 mA cm-2 for 40 h, the voltage only increased ∼2.5%.
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