Advantageous Configurative Heteroatoms-Doped Carbon Foams Design and Application for Ultrahigh-Powered Zn–Air Batteries,ACS Sustainable Chemistry & Engineering

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Advantageous Configurative Heteroatoms-Doped Carbon Foams Design and Application for Ultrahigh-Powered Zn–Air Batteries
ACS Sustainable Chemistry & Engineering ( IF 7.1 ) Pub Date : 2020-01-03 , DOI: 10.1021/acssuschemeng.9b05833
Yongxia Wang ₁ , Yanxing Zhang _{2,

3} , Haitao Huang ₄ , Jinli Qiao _{1,

5}

Affiliation

Heteroatoms-doped carbon is considered a promising electrocatalyst to overcome the sluggish oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) which are the core processes for many energy conversion devices. Much research has been done to screen carbon-based catalysts for ORR or OER. Catalytic activity is not satisfactory to both sides, and the unclear catalytic mechanism greatly limits their wide application. Here, we describe a family of heteroatoms (Fe, N, and S)-codoped carbon foams with excellent electrocatalytic activity for both ORR and OER, giving an exceptional small overpotential of 0.688 V, superior to the case for commercial 20% Pt/C. Remarkably, the rechargeable Zn–air battery with the catalysts as the air cathode delivers an ultrahigh power density of 578 mW cm^–2, along with an excellent charge and discharge cycling stability beyond 250 h (1500 cycle), surpassing that of most bifunctional catalysts reported to date. More importantly, the perfect combination of experiments and DFT calculations confirms that the unique configuration of FeN₄/S-N-Gra endows the heteroatoms-codoped carbon foams with excellent electrocatalytic activity and stability. The DFT-guided advantageous configurative heteroatoms-doped carbon foams as bifunctional catalysts for ORR and OER may provide guidance for the design of nonprecious metal catalysts in the practical application of Zn–air batteries.

中文翻译：

超高功率锌-空气电池组的优势配置杂原子掺杂碳泡沫的设计和应用

杂原子掺杂的碳被认为是克服了缓慢的氧气还原反应（ORR）和氧气释放反应（OER）的有前途的电催化剂，氧气是许多能量转换装置的核心工艺。已经进行了许多研究来筛选用于ORR或OER的碳基催化剂。双方的催化活性都不令人满意，并且不清楚的催化机理极大地限制了它们的广泛应用。在这里，我们描述了一个杂原子（Fe，N和S）共混的碳泡沫，对ORR和OER均具有出色的电催化活性，具有0.688 V的极小的过电势，优于商用20％Pt / C的情况。。值得注意的是，带有空气催化剂的催化剂的锌空气电池可提供578 mW cm ^–2的超高功率密度，以及超过250小时（1500次循环）的出色的充放电循环稳定性，超过了迄今为止报道的大多数双功能催化剂的稳定性。更重要的是，实验和DFT计算的完美结合证实了FeN ₄ / SN-Gra的独特构型赋予了杂原子共混碳泡沫以优异的电催化活性和稳定性。DFT引导的有利的配置型杂原子掺杂碳泡沫作为ORR和OER的双功能催化剂，可以为Zn-空气电池的实际应用中的非贵金属催化剂的设计提供指导。

更新日期：2020-01-04

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