镍铁层状双氢氧化物包覆银纳米线作为水裂解双功能电催化剂
Silver Nanowires Shelled with NiFe Layered Double Hydroxide Are Used as Bifunctional Electrocatalyst for Water Splitting
DOI: 10.12677/MS.2023.135049, PDF,    国家自然科学基金支持
作者: 龚致文：中南大学材料科学与工程学院，湖南 长沙
关键词: 镍铁双氢氧化物；银纳米线；水热法；电催化；水分解；br> Nickel-Iron Layered Double Hydroxides； Silver Nanowires； Hydrothermal Method； Electrocatalysis； Water Splitting
摘要: 镍铁层状双氢氧化物(NiFe-LDHs)是一种高效催化析氧反应(OER)的材料，它的活性优于Ir和IrO2等传统的贵金属催化剂，但是其较差的导电率和材料堆积所导致的活性位点易降解，大大限制了其作为电催化剂方面的应用。而银纳米线(Ag NWs)优良的导电性及较大的比表面积使得Ag NW@NiFe-LDHs核–壳复合材料在电催化方面应用成为可能。基于此，本文提出了利用水热法在已经制备得到的银纳米线上均匀包覆生长一层镍铁层状双氢氧化物材料，显著提高了材料的析氧性能和析氢性能。在50 mA•cm−2的电流密度下，其OER的起始过电位为220 mV，优于大多数报道的镍基催化剂。以银纳米线为核生长的镍铁层状双氢氧化物材料能够暴露更多的活性位点，从而加速水解反应的进行。
Abstract: Nickel-iron layered double hydroxides (NiFe-LDHs) are highly efficient catalysts for oxygen evolu-tion reaction (OER). Their activity is better than that of traditional noble metal catalysts such as Ir/C and IrO2. However, their poor electrical conductivity and easily degradable active sites caused by material stacking greatly limit their application as electrocatalysts. The excellent electrical con-ductivity and large specific surface area of Silver Nanowires (Ag NWs) make it possible for Ag NW@NiFe-LDHs core-shell composites to be used in electrocatalysis. Based on this, a new method was proposed to grow a layer of NiFe layered double hydroxide material on the prepared silver nanowires by hydrothermal method, which significantly improved the oxygen evolution and hy-drogen evolution properties of the material. The initial overpotential of OER is 220 mV at a current density of 50 mA•cm−2, which is better than most reported nickel-based catalysts. The nickel-iron layered dihydroxides grown with silver nanowires as cores can expose more active sites and thus accelerate the hydrolysis reaction.
文章引用：龚致文. 镍铁层状双氢氧化物包覆银纳米线作为水裂解双功能电催化剂[J]. 材料科学, 2023, 13(5): 458-471. https://doi.org/10.12677/MS.2023.135049

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