State Key Laboratory of Coal Combustion, School of Energy and Power Engineering, Huazhong University of Science and Technology, 430074 Wuhan, China; China-EU Institute for Clean and Renewable Energy, Huazhong University of Science and Technology, 1037 Luoyu Road, Wuhan, Hubei 430074, China.
State Key Laboratory of Coal Combustion, School of Energy and Power Engineering, Huazhong University of Science and Technology, 430074 Wuhan, China.
Waste Manag. 2020 May 15;109:119-126. doi: 10.1016/j.wasman.2020.05.003. Epub 2020 May 11.
Carbon-based bimetallic electrocatalysts were obtained by catalytic pyrolysis of waste plastics with Fe-Ni-based catalysts and were used as efficient oxygen reduction reaction (ORR) catalysts in this study. The prepared iron-nickel alloy nanoparticles encapsulated in oxidized carbon nanotubes (FeNi-OCNTs) are solid products with a unique structure. Moreover, the chemical composition and structural features of FeNi-OCNTs were determined. The iron-nickel alloy nanoparticles were wrapped in carbon layers, and the carbon nanotubes had an outer diameter of 20-50 nm and micron-scale lengths. FeNi-OCNT with a Fe/Ni ratio of 1:2 (FeNi-OCNT12) exhibited remarkable electrochemical performance as an ORR catalyst with a positive onset potential of 1.01 V (vs. RHE) and a half-wave potential of 0.87 V (vs. RHE), which were comparable to those of a commercial 20% Pt/C catalyst. Furthermore, FeNi-OCNT12 exhibited promising long-term stability and higher tolerance to methanol than the commercial 20% Pt/C catalyst in an alkaline medium. These properties were attributable to the protective OCNT coating of the iron-nickel alloy nanoparticles.
本研究通过废塑料催化热解得到了负载 Fe-Ni 基催化剂的碳基双金属电催化剂，并将其用作高效氧还原反应（ORR）催化剂。所制备的铁镍合金纳米颗粒封装在氧化碳纳米管中的（FeNi-OCNTs）是具有独特结构的固体产物。此外，还确定了 FeNi-OCNTs 的化学组成和结构特征。铁镍合金纳米颗粒被碳层包裹，碳纳米管的外径为 20-50nm，长度为微米级。具有 Fe/Ni 比为 1:2（FeNi-OCNT12）的 FeNi-OCNT 作为 ORR 催化剂表现出显著的电化学性能，其起始电位为 1.01V（相对于 RHE），半波电位为 0.87V（相对于 RHE），与商业 20%Pt/C 催化剂相当。此外，在碱性介质中，FeNi-OCNT12 表现出比商业 20%Pt/C 催化剂更好的长期稳定性和对甲醇的更高耐受性，这归因于铁镍合金纳米颗粒的 OCNT 保护性涂层。
