Interfacial Electronic Structure Modulation of Hierarchical Co(OH)F/CuCo2S4 Nanocatalyst for Enhanced Electrocatalysis and Zn-Air Batteries Performances
Interfacial Electronic Structure Modulation of Hierarchical Co(OH)F/CuCo2S4 Nanocatalyst for Enhanced Electrocatalysis and Zn-Air Batteries Performances
复制标题
多级 Co(OH)F/CuCo2S4 纳米催化剂的界面电子结构调节增强电催化和锌空气电池性能
DOI：
10.1021/acsami.9b10149
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发表时间：
2019
影响因子：
9.5
通讯作者：
Wang Qin
中科院分区：
文献类型：
--
作者：
Sun Jing;Song Tianshan;Shao Zhiyu;Guo Niankun;Huang Keke;He Feng;Wang Qin
探索用于氧还原反应（ORR）和析氧反应（OER）的鲁棒多功能电催化剂是可持续能源的一个持续挑战。然而，作为可再生金属-空气电池和燃料电池的关键反应，ORR和OER的能量转换效率受其反应动力学的影响很大。除了设计优异的电催化剂外，迫切需要稳定电解质/电极界面的新方法。本文制备了一种层次化Co(OH)F/CuCo2S4杂化物，作为碱性介质中OER和ORR的高效催化剂。尖晶石铁氧体与氢氧化物的结合可以大大提高其催化性能。最佳的Co(OH)F/CuCo2S4混合材料在10 mA·cm−2下具有230 mV的超低过电位，具有优异的OER性能和持久的稳定性。在0.1 M KOH溶液中，ORR的起始电位和半波电位分别为0.88 V和0.80 V。此外，Co(OH)F/CuCo2S4杂化催化剂在50.0 mA·cm−2下的过电位低至1.12 V，功率密度高达144 mW·cm−2，电化学寿命长达118 h（118次循环），优于Pt/C和RuO2催化剂。尖晶石与氢氧化物在界面处的合理结合可提供多功能电催化，并具有较高的氧转化反应活性。Co(OH)F和CuCo2S4之间的协同耦合效应和界面电子相互作用可以显著提高电子传递速率，这些协同优势使得多相结构的多功能电催化剂能够产生优异的催化性能
The exploration of robust multifunctional electrocatalyst for oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) is a continuing challenge for the sustainable energy sources. However, as the key reactions in renewable metal−air batteries and fuel cells, the energy conversion efficiencies of ORR and OER are greatly affected by their reaction kinetics. In addition to designing excellent electrocatalysts, new methods to stabilize the electrolyte/electrode interfaces are urgently needed. Herein, a hierarchical Co(OH)F/CuCo2S4 hybrid was created as an efficient catalyst for OER and ORR in alkaline media. Combining spinel ferrite with the hydroxide can greatly boost their catalytic performance. The optimal Co(OH)F/CuCo2S4 hybrid exhibits superior OER performance and durable stability, as demonstrated by an ultralow overpotential of 230 mV at 10 mA·cm−2. The onset potential and the half-wave potential in 0.1 M KOH solution for ORR are 0.88 and 0.80 V, respectively. Furthermore, the Co(OH)F/CuCo2S4 hybrid served as a catalyst in Zn air batteries catalyst exhibits a low overpotential of 1.12 V at 50.0 mA· cm−2, large power density of 144 mW·cm−2, and a long electrochemical lifetime of 118 h (118 cycles), which is even better than those of the Pt/C and RuO2 catalysts. The rational integration of spinel and hydroxide at the interface can provide multifunctional electrocatalysis and possess a high reactivity for oxygen conversion. Synergistic coupling effect and interfacial electronic interaction between Co(OH)F and CuCo2S4 can significantly enhance the electron transfer rate, and these synergistic advantages enable the heterogeneous structure of the multifunctional electrocatalyst to produce excellent catalytic performance