Activated FeS2@NiS2 Core–Shell Structure Boosting Cascade Reaction for Superior Electrocatalytic Oxygen Evolution,Small

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Activated FeS2@NiS2 Core–Shell Structure Boosting Cascade Reaction for Superior Electrocatalytic Oxygen Evolution
Small ( IF 13.0 ) Pub Date : 2023-02-03 , DOI: 10.1002/smll.202207472
Lulu Zhang _{1,

2} , Ju Rong ₃ , Yongqiang Yang ₁ , Huaze Zhu _{1,

2} , Xiaohua Yu ₃ , Chunlin Chen ₁ , Hui-Ming Cheng _{1,

4} , Gang Liu _{1,

2}

Affiliation

Unlike single-step reactions, multi-step reactions can be greatly facilitated only if all the intermediate reactions can be catalyzed simultaneously and progressively. Herein, the theoretical analysis and experiments to illustrate the superiority of the cascade oxygen evolution reaction (OER) are conducted. As different OER intermediate reactions demand Fe_xNi_1-xOOH with altered Fe/Ni ratios, gradient Fe-doped NiOOH can be an ideal electrocatalyst for the efficient cascade OER in line. Fine controlling of the nucleation sequence of iron and nickel sulfides leads to a FeS₂@NiS₂ core–shell structure. The activated outward diffusion of Fe dopants results in the gradient Fe/Ni ratios in the Fe_xNi_1-xOOH shell, where a cascade OER can happen. Electrochemical tests suggest that the FeS₂@NiS₂ only needs an overpotential of 237 mV to reach the current density of 10 mA cm⁻², with fast reaction kinetics and good stability.

中文翻译：

活化的 FeS2@NiS2 核壳结构促进级联反应以实现优异的电催化析氧

与单步反应不同，只有当所有中间反应都可以同时并逐步催化时，多步反应才能大大促进。在此，进行了理论分析和实验来说明级联析氧反应（OER）的优越性。由于不同的 OER 中间反应需要 Fe _x Ni _1-x OOH 改变 Fe/Ni 比率，因此梯度 Fe 掺杂的 NiOOH 可以成为高效串联 OER 的理想电催化剂。精细控制铁和镍硫化物的成核顺序导致 FeS ₂ @NiS ₂核壳结构。_{Fe 掺杂剂的激活向外扩散导致 Fe x} Ni _1-x中的梯度 Fe/Ni 比率OOH 外壳，可以发生级联 OER。电化学测试表明，FeS ₂ @NiS ₂仅需237 mV的过电位即可达到10 mA cm ^-2的电流密度，反应动力学快，稳定性好。

更新日期：2023-02-03

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