Feng Xiaogeng, Bo Xiangjie, Guo Liping
Key Laboratory of Nanobiosensing and Nanobioanalysis at Universities of Jilin Province, Faculty of Chemistry, Northeast Normal University, Changchun 130024, PR China.
Key Laboratory of Nanobiosensing and Nanobioanalysis at Universities of Jilin Province, Faculty of Chemistry, Northeast Normal University, Changchun 130024, PR China.
J Colloid Interface Sci. 2020 Sep 1;575:69-77. doi: 10.1016/j.jcis.2020.04.093. Epub 2020 Apr 23.
Rational design and synthesis of multifunctional electrocatalysts with high-efficient activity and robust stability toward the oxygen reduction reaction (ORR), hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) are highly desirable, but remain a challenging step. Herein, a novel hollow bimetallic carbide/nitrogen-doped carbon nanotube (CoMoC@NCNT) is successfully synthesized through the simple pyrolysis of polypyrrole (PPy)-supported metal-organic framework (MOF) composite. Remarkable characteristics of the large surface area, hollow and porous structure, rich active sites and synergistic effect between CoMoC and NCNT arouse high catalytic efficiency. Notably, the CoMoC@NCNT presents excellent ORR catalytic activity (a high half-wave potential of 0.875 V vs. reversible hydrogen electrode (RHE) and diffusion-limited current density of 6.22 mA cm) via a four-electron pathway, together with outstanding stability and methanol tolerance over commercial Pt/C in 0.1 M KOH solution. The composite also exhibits superior HER performance, delivering a low overpotential of 122.14 mV at current density of 10 mA cm, as well as good catalytic performance for OER in 1.0 M KOH solution. This work may provide some insight in design multifunctional electrocatalysts derived from MOF with advanced performance for sustainable energy technologies.
合理设计和合成对氧还原反应（ORR）、析氢反应（HER）和析氧反应（OER）具有高效活性和稳健稳定性的多功能电催化剂是非常必要的，但仍然是具有挑战性的一步。在此，通过聚吡咯（PPy）负载的金属有机框架（MOF）复合材料的简单热解成功合成了一种新型中空双金属碳化物/氮掺杂碳纳米管（CoMoC@NCNT）。大表面积、中空和多孔结构、丰富的活性位点以及CoMoC和NCNT之间的协同效应等显著特性引发了高催化效率。值得注意的是，CoMoC@NCNT在0.1 M KOH溶液中通过四电子途径呈现出优异的ORR催化活性（相对于可逆氢电极（RHE）的高半波电位为0.875 V，扩散限制电流密度为6.22 mA cm），以及优于商业Pt/C的稳定性和甲醇耐受性。该复合材料还表现出优异的HER性能，在电流密度为10 mA cm时具有122.14 mV的低过电位，并且在1.0 M KOH溶液中对OER具有良好的催化性能。这项工作可能为设计具有先进性能的MOF衍生多功能电催化剂以用于可持续能源技术提供一些见解。
