MOE Laboratory of Bioinorganic and Synthetic Chemistry, The Key Lab of Low-Carbon Chemistry and Energy Conservation of Guangdong Province, School of Chemistry, Sun Yat-sen University, Guangzhou, 510275, China.
College of Materials Science and Engineering, Central South University of Forestry and Technology, Changsha, 410004, China.
Adv Mater. 2018 May;30(21):e1705442. doi: 10.1002/adma.201705442. Epub 2018 Apr 6.
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@NiCoO core@shell nanoparticles (NiCo@NiCoO /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@NiCoO /C PMRAs significantly improve the conductivity of NiCoO and accelerate the kinetics of OER. The above advantages obviously enhance the electrocatalytic performance of NiCo@NiCoO /C PMRAs. The experimental results demonstrate that the NiCo@NiCoO /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.
研究成本效益高且性能优异的电催化剂对于氧气析出反应（OER）至关重要。在这里，通过还原碳化双金属（Ni、Co）金属有机骨架微棒阵列（表示为 NiCo-MOF MRAs）并随后进行控制氧化煅烧，制备了由碳限制的 NiCo@NiCoO 核壳纳米粒子构成的多孔微棒阵列（NiCo@NiCoO/C PMRAs）。它们成功地结合了大比表面积、高导电性和 OER 的多个电催化活性位点等理想特性。此外，NiCo@NiCoO/C PMRAs 中的氧空位显著提高了 NiCoO 的电导率并加速了 OER 的动力学过程。这些优势明显增强了 NiCo@NiCoO/C PMRAs 的电催化性能。实验结果表明，NiCo@NiCoO/C PMRAs 作为电催化剂在碱性介质中表现出高催化活性、低过电势和高 OER 稳定性。所报道的策略将为电化学能量转换装置中制备具有可控形态的多孔双金属复合电催化剂开辟一条新途径。
