Co3O4 Nanoparticles Anchored on Nitrogen-Doped Partially Exfoliated Multiwall Carbon Nanotubes as an Enhanced Oxygen Electrocatalyst for the Rechargeable and Flexible Solid-State Zn–Air Battery,ACS Applied Energy Materials

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Co3O4 Nanoparticles Anchored on Nitrogen-Doped Partially Exfoliated Multiwall Carbon Nanotubes as an Enhanced Oxygen Electrocatalyst for the Rechargeable and Flexible Solid-State Zn–Air Battery
ACS Applied Energy Materials ( IF 5.4 ) Pub Date : 2019-05-22 00:00:00 , DOI: 10.1021/acsaem.9b00675
Zongxiong Huang ₁ , Xueping Qin ₂ , Guanzhou Li ₁ , Weicong Yao ₁ , Jun Liu ₁ , Naiguang Wang ₁ , Kemakorn Ithisuphalap ₃ , Gang Wu ₃ , Minhua Shao ₂ , Zhicong Shi ₁

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This work presents a desirable bifunctional catalyst—Co₃O₄ nanoparticles anchored on nitrogen-doped partially exfoliated multiwall carbon nanotubes (Co₃O₄/N-p-MCNTs)—for oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) for the rechargeable and flexible solid-state Zn–air battery. The Co₃O₄/N-p-MCNTs demonstrates good catalytic performance with the ORR half-wave potential of 0.760 V (vs RHE). Additionally, the Co₃O₄/N-p-MCNTs exhibits superior limiting current density with higher stability than Pt/C in alkaline solutions. The catalyst obtains a low operating potential (E_j10) of 1.62 V (vs RHE) to achieve a 10 mA cm^–2 current density for OER. The potential difference (ΔE) between E_j10 of OER and ORR half-wave potential is 0.86 V, which is smaller than that of many highly active bifunctional catalysts reported recently. Moreover, a Zn–air battery utilizing Co₃O₄/N-p-MCNTs as the catalyst in cathode could successfully generate a specific capacity of 768 mAh g^–1 at 10 mA cm^–2, and there is no voltage loss after a continuous discharge of 135 h. The fabricated solid-state rechargeable Zn–air battery displays a high power density and superior long-term cycling stability. Furthermore, first-principles density functional theory simulations were conducted to explore the interfacial properties of the hybrid catalyst, hinting that the N-p-MCNTs could significantly enhance the electrical conductivity of Co₃O₄ nanoparticles. The free energy diagrams generated from our simulations suggest that the N-p-MCNTs influence the superior ORR performance, while cobalt oxide affects the favored performance of OER. The obtained results confirm that the Co₃O₄/N-p-MCNTs catalyst would have a broad impact and could be used for renewable energy conversion devices.

中文翻译：

Co ₃ O ₄纳米颗粒锚固在氮掺杂部分剥落的多壁碳纳米管上，作为可充电和柔性固态Zn-空气电池的增强型氧电催化剂

这项工作提出了一种理想的双功能催化剂-锚固在氮掺杂的部分剥落多壁碳纳米管（Co ₃ O ₄ / Np-MCNTs）上的Co ₃ O ₄纳米粒子-用于氧还原反应（ORR）和氧释放反应（OER）。可充电且灵活的固态Zn-空气电池。Co ₃ O ₄ / Np-MCNTs具有良好的催化性能，ORR半波电势为0.760 V（vs RHE）。另外，在碱性溶液中，Co ₃ O ₄ / Np-MCNT比Pt / C具有更好的极限电流密度和更高的稳定性。催化剂的工作电位低（E _j10）达到1.62 V（vs RHE），以实现OER的10 mA cm ^–2电流密度。OER的E _j10与ORR半波电势之间的电势差（ΔE）为0.86 V，比最近报道的许多高活性双功能催化剂的电势差小。此外，使用Co ₃ O ₄ / Np-MCNTs作为阴极催化剂的锌空气电池可以在10 mA cm ^{–2的条件下}成功产生768 mAh g ^–1的比容量。，并且连续放电135小时后没有电压损失。制成的固态可再充电锌空气电池显示出高功率密度和出色的长期循环稳定性。此外，进行了第一性原理密度泛函理论模拟，以探索杂化催化剂的界面性质，表明Np-MCNTs可以显着提高Co ₃ O ₄纳米粒子的电导率。从我们的模拟生成的自由能图表明，Np-MCNT会影响优越的ORR性能，而氧化钴会影响OER的良好性能。所得结果证实了Co ₃ O ₄/ Np-MCNTs催化剂将产生广泛的影响，可用于可再生能源转换设备。

更新日期：2019-05-22

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