Core-Shell Structured NiFeSn@NiFe (Oxy)Hydroxide Nanospheres from an Electrochemical Strategy for Electrocatalytic Oxygen Evolution Reaction.,Advanced Science

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Core-Shell Structured NiFeSn@NiFe (Oxy)Hydroxide Nanospheres from an Electrochemical Strategy for Electrocatalytic Oxygen Evolution Reaction.
Advanced Science ( IF 14.3 ) Pub Date : 2020-03-28 , DOI: 10.1002/advs.201903777
Mingxing Chen _{1,

2} , Shenglin Lu _{1,

2} , Xian-Zhu Fu ₁ , Jing-Li Luo _{1,

3}

Affiliation

Efficient electrocatalysts for the oxygen evolution reaction (OER) are highly desirable because of the intrinsically sluggish kinetics of OER. Herein, core-shell structured nanospheres of NiFe x Sn@NiFe (oxy)hydroxide (denoted as NiFe x Sn-A) are prepared as active OER catalysts by a facile electrochemical strategy, which includes electrodeposition of NiFe x Sn alloy nanospheres on carbon cloth (CC) and following anodization. The alloy core of NiFe x Sn could promote charge transfer, and the amorphous shell of NiFe (oxy)hydroxide is defect-rich and nanoporous due to the selective electrochemical etching of Sn in alkaline medium. The optimized catalyst of NiFe0.5Sn-A displays a remarkable OER performance with a low overpotential of 260 mV to reach the current density of 10 mA cm-2, a small Tafel slope of 50 mV dec-1, a high turnover frequency of 0.194 s-1 at an overpotential of 300 mV, and a robust durability. Further characterizations indicate that the superior OER performance of the core-shell structured NiFe0.5Sn-A nanospheres might originate from abundant active sites and small charge transfer resistance. This work brings a new perspective to the design and synthesis of core-shell structured nanospheres for electrocatalysis through a facile electrochemical strategy.

中文翻译：

电催化析氧反应的电化学策略中的核壳结构 NiFeSn@NiFe（氧）氢氧化物纳米球。

由于 OER 本质上缓慢的动力学，因此非常需要用于析氧反应 (OER) 的高效电催化剂。在此，通过简单的电化学策略，包括将 NiFe x Sn 合金纳米球电沉积在碳布上，制备了 NiFe x Sn@NiFe（氧）氢氧化物（表示为 NiFe x Sn-A）的核壳结构纳米球作为活性 OER 催化剂。 (CC) 和随后的阳极氧化。NiFe x Sn的合金核可以促进电荷转移，而NiFe（羟基）氧化物的非晶壳由于Sn在碱性介质中的选择性电化学蚀刻而富含缺陷和纳米孔。优化后的 NiFe0.5Sn-A 催化剂表现出卓越的 OER 性能，达到 10 mA cm-2 的电流密度时具有 260 mV 的低过电势、50 mV dec-1 的小塔菲尔斜率、0.194 的高周转频率s-1 的过电势为 300 mV，并且具有强大的耐用性。进一步的表征表明，核壳结构的NiFe0.5Sn-A纳米球优异的OER性能可能源于丰富的活性位点和较小的电荷转移电阻。这项工作通过简单的电化学策略为电催化的核壳结构纳米球的设计和合成带来了新的视角。

更新日期：2020-03-28

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