Co9S8 integrated into nitrogen/sulfur dual-doped carbon nanofibers as an efficient oxygen bifunctional electrocatalyst for Zn–air batteries,Sustainable Energy & Fuels

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Co9S8 integrated into nitrogen/sulfur dual-doped carbon nanofibers as an efficient oxygen bifunctional electrocatalyst for Zn–air batteries
Sustainable Energy & Fuels ( IF 5.0 ) Pub Date : 2019/12/16 , DOI: 10.1039/c9se01130g
Weiwei Zheng _{1,

2,

3,

4,

5} , Jiangquan Lv _{1,

2,

3,

4,

5} , Huabin Zhang _{1,

2,

3,

4,

5} , Hai-Xia Zhang _{1,

2,

3,

4,

5} , Jian Zhang _{1,

2,

3,

4,

5}

Affiliation

Rational design of efficient precious metal-free bifunctional electrocatalysis for the oxygen reduction and evolution reactions (ORR/OER) is highly demanded for practical applications in metal–air batteries. Herein, Co₉S₈ nanoparticles (NPs) encapsulated in nitrogen/sulfur dual-doped porous carbon nanofibers had been designed and synthesized by an electrospinning method with subsequent thermal annealing and denoted as Co₉S₈/NSC nanofibers. The as-prepared Co₉S₈/NSC nanofibers with high intrinsic activity and electrical conductivity exhibited excellent bifunctional oxygen electrocatalytic activity, with a half-wave potential of 0.84 V (vs. RHE) for the ORR and a potential of 1.56 V (vs. RHE) for the OER at 10 mA cm⁻² current density. When Co₉S₈/NSC nanofibers were employed as an air electrode catalyst for rechargeable Zn–air batteries, a high energy density (997 W h kg⁻¹), a low charge/discharge voltage gap, and an impressive long-term cycle stability (over 1000 cycles at 10 mA cm⁻²) were achieved.

中文翻译：

Co9S8集成到氮/硫双掺杂碳纳米纤维中，作为锌-空气电池的高效氧双功能电催化剂

在金属-空气电池的实际应用中，对用于氧还原和放出反应（ORR / OER）的高效无贵金属双功能电催化的合理设计提出了很高的要求。在此，通过电纺丝方法并随后进行热退火，设计并合成了包封在氮/硫双掺杂多孔碳纳米纤维中的Co ₉ S ₈纳米颗粒（NPs），并表示为Co ₉ S ₈ / NSC纳米纤维。所制备的具有高固有活性和电导率的Co ₉ S ₈ / NSC纳米纤维表现出优异的双功能氧电催化活性，半波电势为0.84 V（vs.在10 mA cm ^-2的电流密度下，ORR的电势为RHE），OER的电势为1.56 V（对RHE）。当将Co ₉ S ₈ / NSC纳米纤维用作可再充电Zn-空气电池的空气电极催化剂时，具有高能量密度（997 W h kg ^-1），低充电/放电电压间隙以及令人印象深刻的长期循环达到了稳定性（在10 mA cm ^-2时超过1000个循环）。

更新日期：2020-03-03

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