Bifunctional mesoporous CoO/nitrogen‐incorporated graphene electrocatalysts for high‐power and long‐term stability of rechargeable zinc‐air batteries,International Journal of Energy Research

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Bifunctional mesoporous CoO/nitrogen‐incorporated graphene electrocatalysts for high‐power and long‐term stability of rechargeable zinc‐air batteries
International Journal of Energy Research ( IF 4.3 ) Pub Date : 2020-12-02 , DOI: 10.1002/er.6263
Tae Ho Park _{1,

2} , Jeong Seok Yeon ₁ , Periyasamy Sivakumar ₃ , Youngkwon Kim ₂ , Ho Seok Park ₁

Affiliation

Despite high energy density, low‐cost, and ecofriendly, rechargeable Zinc‐air batteries (ZABs) suffer from sluggish kinetics stability during oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) at the cathode. Herein, we demonstrate CoO nanoparticles anchored on N‐doped reduced graphene oxide (CoO/N‐rGO) with an excellent bifunctional catalytic activity and stability and facile redox kinetics of ORR and OER for high‐performance rechargeable ZABs. The CoO/N‐rGO catalysts are featured with the abundant active sites, a large accessible area, and high electrochemical conductivity, which are associated with increased oxygen vacancy surface, reduced valence, and mesoporous architecture. The half‐wave potential (E_1/2) and electron transfer number for ORR are 0.79 V and 3.72 at 0.40 V (vs RHE), respectively, while OER potential at 10 mA cm⁻² (E_{j = 10}) is 1.61 V (vs RHE). Remarkably, the ZAB cell with CoO/N‐rGO achieves high specific capacity of 545 mAh g_zn⁻¹, power density of 41 mW cm⁻², and cyclic stabilities with high energy efficiency of 64.44% at 2 mA cm⁻². In addition, postmortem analysis validates that the oxidation and aggregation of CoO/N‐rGO catalyst is mitigated while the inactivation of Zn anode is inhibited.

中文翻译：

双功能介孔CoO /氮结合石墨烯电催化剂可提高可充电锌空气电池的高功率和长期稳定性

尽管具有高能量密度，低成本和生态友好性，可再充电锌空气电池（ZAB）在阴极的氧还原反应（ORR）和氧释放反应（OER）期间仍具有缓慢的动力学稳定性。在本文中，我们展示了锚固在N掺杂的还原氧化石墨烯（CoO / N-rGO）上的CoO纳米颗粒，具有出色的双功能催化活性，稳定的ORR和OER氧化还原动力学，可用于高性能可充电ZAB。CoO / N-rGO催化剂具有丰富的活性中心，较大的可及区域和较高的电化学电导率，与增加的氧空位表面，降低的化合价和介孔结构有关。半波电势（E _1/2）和0.40 V（vs RHE）时ORR的电子转移数分别为0.79 V和3.72，而10 mA cm ^-2（E _{j = 10}）时的OER电位为1.61 V（vs RHE）。值得注意的是，具有CoO / N-rGO的ZAB电池在2 mA cm ^-2时可实现545 mAh g _zn^-1的高比容量，41 mW cm ^-2的功率密度和循环稳定性，并具有64.44％的高能效。此外，事后分析验证了CoO / N-rGO催化剂的氧化和聚集得以缓解，而Zn阳极的失活得到了抑制。

更新日期：2020-12-02

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