NiCo2O4/N-doped graphene as an advanced electrocatalyst for oxygen reduction reaction
NiCo2O4/N-doped graphene as an advanced electrocatalyst for oxygen reduction reaction
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NiCo2O4/N掺杂石墨烯作为氧还原反应的先进电催化剂
DOI：
10.1016/j.jpowsour.2015.01.147
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发表时间：
2015-04-15
影响因子：
9.2
通讯作者：
Chen, Jiajie
中科院分区：
文献类型：
--
作者：
Zhang, Hui;Li, Huiyong;Chen, Jiajie
开发低成本的高性能氧还原反应催化剂是非常必要的。本文首次提出NiCo 2 O 4/N掺杂还原氧化石墨烯（NiCo 2 O 4/N-rGO）杂化物作为高性能的ORR催化剂。通过循环伏安法（CV）和线性扫描伏安法（LSV）对NiCo 2 O 4/N-rGO杂化材料进行了研究，并与无N-rGO的NiCo 2 O 4和裸N-rGO进行了比较。由于协同效应，NiCo 2 O 4/N-rGO杂化物的催化性能显著提高，起始电位为-0.12 V，主要为直接四电子途径，接近商业碳载Pt的行为。同时，通过比较NiCo 2 O 4/N-rGO和NiCo 2 O 4/rGO，研究了N掺杂的好处，其中观察到更高的阴极电流，更正的半波电势和更多的电子转移数，这应该归因于N掺入石墨烯中产生的新的高效活性位点。NiCo_2O_4/N-rGO杂化材料可作为高功率金属/空气电池的催化剂。(C)2015 Elsevier B. V.版权所有。
Developing low-cost catalyst for high-performance oxygen reduction reaction (ORR) is highly desirable. Herein, NiCo2O4/N-doped reduced graphene oxide (NiCo2O4/N-rGO) hybrid is proposed as a high-performance catalyst for ORR for the first time. The well-formed NiCo2O4/N-rGO hybrid is studied by cyclic voltammetry (CV) curves and linear-sweep voltammetry (LSV) performed on the rotating-ring-disk-electrode (ROE) in comparison with N-rGO-free NiCo2O4 and the bare N-rGO. Due to the synergistic effect, the NiCo2O4/N-rGO hybrid exhibits significant improvement of catalytic performance with an onset potential of -0.12 V, which mainly favors a direct four electron pathway in ORR process, close to the behavior of commercial carbon-supported Pt. Also, the benefits of N-incorporation are investigated by comparing NiCo2O4/N-rGO with NiCo2O4/rGO, where higher cathodic currents, much more positive half-wave potential and more electron transfer numbers are observed for the N-doping one, which should be ascribed to the new highly efficient active sites created by N incorporation into graphene. The NiCo2O4/N-rGO hybrid could be used as a promising catalyst for high power metal/air battery. (C) 2015 Elsevier B.V. All rights reserved.