磷化钴与杂原子掺杂的纳米碳杂化催化剂结合在一起，可实现高效，长寿命的可充电锌空气电池,Small

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磷化钴与杂原子掺杂的纳米碳杂化催化剂结合在一起，可实现高效，长寿命的可充电锌空气电池
Small ( IF 13.0 ) Pub Date : 2017-09-01 , DOI: 10.1002/smll.201702068
Sung Hoon Ahn ₁ , Arumugam Manthiram ₁

Affiliation

金属磷化物和杂原子掺杂的碳已被认为是氧释放反应（OER）和氧还原反应（ORR）的双功能催化剂。但是，在锌-空气电池（ZAB）中重复进行ORR和OER操作期间，两者都遇到了稳定性问题。在此，本研究报告通过结合金属有机骨架衍生的转化方法和原位交联方法，报道了一种具有一维结构的多用途钴基杂化催化剂。其中，一维杂化催化剂由氮，硫，磷掺杂的碳基质支撑的超小磷化钴纳米颗粒组成，具有接近于基准贵金属催化剂的显着双功能活性，并在全电势范围内具有出色的耐久性。涵盖了OER和ORR。用这种双功能杂化催化剂作为空气电极可以大大降低可再充电ZAB的整体超电势，并且循环稳定性优于市售的Pt / C催化剂。揭示了在ZAB的OER（和/或ORR）期间的加速条件下，磷化钴纳米颗粒被原位转化为氧化钴，并降低了施加到碳上的阳极电流。这有助于碳材料的稳定性并有助于维持杂化催化剂的高初始催化性能。揭示了在ZAB的OER（和/或ORR）期间的加速条件下，磷化钴纳米颗粒被原位转化为氧化钴，并降低了施加到碳上的阳极电流。这有助于碳材料的稳定性并有助于维持杂化催化剂的高初始催化性能。揭示了在ZAB的OER（和/或ORR）期间的加速条件下，磷化钴纳米颗粒被原位转化为氧化钴，并降低了施加到碳上的阳极电流。这有助于碳材料的稳定性并有助于维持杂化催化剂的高初始催化性能。

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Cobalt Phosphide Coupled with Heteroatom‐Doped Nanocarbon Hybrid Electroctalysts for Efficient, Long‐Life Rechargeable Zinc–Air Batteries

Metal phosphides and heteroatom‐doped carbons have been regarded as promising candidates as bifunctional catalysts for oxygen evolution reaction (OER) and oxygen reduction reaction (ORR). However, both have suffered from stability issues during repeated ORR and OER operations in zinc–air batteries (ZABs). Herein, this study reports a versatile cobalt‐based hybrid catalyst with a 1D structure by integrating the metal‐organic framework‐derived conversion approach and an in situ crosslinking method. Among them, the 1D hybrid catalyst composed of ultrasmall cobalt phosphide nanoparticles supported by nitrogen‐, sulfur‐, phosphorus‐doped carbon matrix shows remarkable bifunctional activity close to that of the benchmark precious‐metal catalysts along with an excellent durability in the full potential range covering both the OER and ORR. The overall overpotential of the rechargeable ZABs can be greatly reduced with this bifunctional hybrid catalyst as an air‐electrode, and the cycling stability outperforms the commercial Pt/C catalyst. It is revealed that the cobalt phosphide nanoparticles are in situ converted to cobalt oxide under the accelerated conditions during OER (and/or ORR) of the ZABs and reduces the anodic current applied to the carbon. This contributes to the stability of the carbon material and in maintaining the high initial catalytic properties of the hybrid catalyst.

更新日期：2017-09-01

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