Porous Microrod Arrays Constructed by Carbon-Confined NiCo@NiCoO2 Core@Shell Nanoparticles as Efficient Electrocatalysts for Oxygen Evolution
Porous Microrod Arrays Constructed by Carbon-Confined NiCo@NiCoO2 Core@Shell Nanoparticles as Efficient Electrocatalysts for Oxygen Evolution
复制标题
由碳限制的NiCo@NiCoO2核@壳纳米颗粒构建的多孔微棒阵列作为高效析氧电催化剂
DOI：
10.1002/adma.201705442
复制
发表时间：
2018-05-24
影响因子：
29.4
通讯作者：
Li, Gao-Ren
中科院分区：
文献类型：
--
作者：
Xu, Han;Shi, Zi-Xiao;Li, Gao-Ren
研究经济高效的析氧反应电催化剂已引起人们的广泛关注。在这里，由碳限制的NiCo@NiCoO2核@壳纳米颗粒（NiCo@NiCoO2/C PMRA）构建的多孔微棒阵列通过还原碳化的（Ni，Co）金属有机框架微棒阵列（表示为NiCo-MOF MRA）和随后的受控氧化煅烧来制备。它们成功地结合了联合收割机所需的优点，包括大的比表面积，高电导率，和多个电催化活性位点的OER。此外，NiCo@NiCoO2/C PMRA中的氧空位显著提高了NiCoO 2的电导率，加速了OER动力学。上述优点明显提高了NiCo@NiCoO2/C PMRA的电催化性能。实验结果表明，NiCo@NiCoO2/C PMRA在碱性介质中具有较高的催化活性、较低的过电位和较高的稳定性。该策略将为制备具有可控形貌的MOFs多孔复合电催化剂开辟一条新的途径。
The study of cost-efficient and high-performance electrocatalysts for oxygen evolution reaction (OER) has attracted much attention. Here, porous microrod arrays constructed by carbon-confined NiCo@NiCoO2 core@shell nanoparticles (NiCo@NiCoO2/C PMRAs) are fabricated by the reductive carbonization of bimetallic (Ni, Co) metal-organic framework microrod arrays (denoted as NiCo-MOF MRAs) and subsequent controlled oxidative calcination. They successfully combine the desired merits including large specific surface areas, high conductivity, and multiple electrocatalytic active sites for OER. In addition, the oxygen vacancies in NiCo@NiCoO2/C PMRAs significantly improve the conductivity of NiCoO2 and accelerate the kinetics of OER. The above advantages obviously enhance the electrocatalytic performance of NiCo@NiCoO2/C PMRAs. The experimental results demonstrate that the NiCo@NiCoO2/C PMRAs as electrocatalysts exhibit high catalytic activity, low overpotential, and high stability for OER in alkaline media. The strategy reported will open up a new route for the fabrication of porous bimetallic composite electrocatalysts derived from MOFs with controllable morphology for electrochemical energy conversion devices.