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Origin of the electrocatalytic oxygen evolution activity of nickel phosphides: in-situ electrochemical oxidation and Cr doping to achieve high performance
Science Bulletin ( IF 18.9 ) Pub Date : 2020-11-14 , DOI: 10.1016/j.scib.2020.11.009
Xiaolin Hu 1 , Gan Luo 1 , Xiaolong Guo 1 , Qiannan Zhao 1 , Ronghua Wang 2 , Guangsheng Huang 3 , Bin Jiang 3 , Chaohe Xu 4 , Fusheng Pan 3
Affiliation  

Zinc-air batteries (ZnABs) with high theoretical capacity and environmental benignity are the most promising candidates for next-generation electronics. However, their large-scale applications are greatly hindered due to the lack of high-efficient and cost-effective electrocatalysts. Transition metal phosphides (TMPs) have been reported as promising electrocatalysts. Notably, (Ni1−xCrx)2P (0 ≤ x ≤ 0.15) is an unstable electrocatalyst, which undergoes in-situ electrochemical oxidation during the initial oxygen evolution reaction (OER) and even in the activation cycles, and is eventually converted to Cr-NiOOH serving as the actual OER active sites with high efficiency. Density functional theory (DFT) simulations and experimental results elucidate that the OER performance could be significantly promoted by the synergistic effect of surface engineering and electronic modulations by Cr doping and in-situ phase transformation. The constructed rechargeable ZnABs could stably cycle for more than 208 h at 5 mA cm−2, while the voltage degradation is negligible. Furthermore, the developed catalytic materials could be assembled into flexible and all-solid-state ZnABs to power wearable electronics with high performance.



中文翻译:

磷化镍电催化析氧活性的起源:原位电化学氧化和Cr掺杂实现高性能

具有高理论容量和环境友好性的锌空气电池 (ZnAB) 是下一代电子产品最有希望的候选者。然而,由于缺乏高效且具有成本效益的电催化剂,它们的大规模应用受到很大阻碍。过渡金属磷化物 (TMP) 已被报道为有前途的电催化剂。值得注意的是,(Ni 1 −x Cr x ) 2 P (0 ≤  x  ≤ 0.15) 是一种不稳定的电催化剂,它会原位发生在初始析氧反应(OER)甚至在活化循环中进行电化学氧化,最终转化为 Cr-NiOOH 作为实际的 OER 活性位点,效率很高。密度泛函理论 (DFT) 模拟和实验结果表明,通过 Cr 掺杂和原位相变的表面工程和电子调制的协同效应可以显着提高 OER 性能。构建的可充电 ZnABs 可以在 5 mA cm -2下稳定循环超过 208 小时,而电压衰减可以忽略不计。此外,开发的催化材料可以组装成柔性和全固态 ZnAB,为高性能的可穿戴电子设备提供动力。

更新日期:2020-11-14
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