自支撑Co/Fe(OH)_(x)纳米片电极的制备及电催化析氧性能研究

Fabrication and electrocatalytic activity of self-supported Co/Fe(OH)_(x) nanosheet electrode for OER

贵金属催化剂IrO_(2)、RuO_(2)对电解水析氧反应(OER)有优异的催化性能,但昂贵的成本限制了它们的大规模应用,因此开发优质廉价的非贵金属OER电催化剂是必要的。以Co_(20)Al_(80)合金条带为原料,首先通过电化学脱合金法制备钴纳米片(Co-NS),再用化学浸渍法引入Fe元素,得到催化剂Co/Fe(OH)_(x)纳米片电极[Co/Fe(OH)_(x)-NS]。通过扫描电子显微镜(SEM)、X射线衍射仪(XRD)和X射线光电子能谱(XPS)等手段对催化剂的形貌、晶体结构及表面价态进行了表征,并在1mol/L KOH溶液中测试催化剂的OER催化性能,所制Co/Fe(OH)_(x)-NS仅需235mV的电位就达到10mA/c^(m^(2))的电流密度。

Noble metal-based materials such as IrO_(2),RuO_(2) possess extraordinary catalytic performance toward oxygen evolution reaction(OER),but the high cost restrained their large-scale application.It is necessary to develop OER catalysts based on non-noble metal elements.A Co/Fe(OH)_(x) nanosheets(Co/Fe(OH)_(x)-NS)from Co_(20)Al_(80) alloy precursor as electrode material for OER was presented.Firstly,electrochemical dealloying process was utilized to convert the Co_(20)Al_(80) into cobalt nanosheets(Co-NS),then the Co-NS was processed with impregnation method,and obtained the Co/Fe(OH)_(x)-NS.Scanning electron microscope(SEM),X-ray diffractometer(XRD)and X-ray photoelectron spectroscope(XPS)was utilized to reveal the surface morphology,crystalline structure and valence state of as-prepared samples,and the electrochemical performance toward OER was tested in 1mol/L KOH solution.The Co/Fe(OH)_(x)-NS only required the overpotential of 235mV to attain the current density of 10mA/cm^(2)for OER.