当前位置: X-MOL 学术J. Colloid Interface Sci. › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Cobalt and cobalt oxides N-codoped porous carbon derived from metal-organic framework as bifunctional catalyst for oxygen reduction and oxygen evolution reactions
Journal of Colloid and Interface Science ( IF 9.9 ) Pub Date : 2018-03-13 , DOI: 10.1016/j.jcis.2018.03.036
Gui Xu , Guan-Cheng Xu , Jin-Jin Ban , Li Zhang , He Lin , Chun-Lin Qi , Zhi-Peng Sun , Dian-Zeng Jia

Metal-organic framework (MOF)-derived transition metal/metal oxide-carbon hybrids are promising cost-effective electrocatalysts to replace noble metal catalysts for oxygen reduction reaction (ORR) and oxygen evolution reaction (OER). Herein, [email protected]@Co3O4-N/C was prepared by two-step thermal treatment of Co-MOF ([Co(INA)2]·0.5EtOH) (INA: isonicotinic acid). Firstly, Co-MOF, as precursor, was pyrolyzed at different temperatures in N2 atmosphere to obtain Co-N/C-T (T = 700, 800, 900 °C) materials among which Co-N/C-800 shows remarkably high ORR activity. After oxidation treatment, Co-N/C-800 is transformed into [email protected]@Co3O4-N/C which exhibits enhanced electrocatalytic activities for both ORR and OER. The as-obtained [email protected]@Co3O4-N/C has more positive onset potential (−0.136 V vs. Ag/AgCl) and higher limit current density (4.9 mA cm−2) than Co-N/C-800 (−0.143 V vs. Ag/AgCl and 3.9 mA cm−2), as well as better tolerance to methanol and stability (80.0%) than those of Pt/C (63.2%) for ORR. [email protected]@Co3O4-N/C also displays outstanding OER performances, with lower overpotential (450 mV) than that of Co-N/C-800 (492 mV) at a current density of 10 mA cm−2. The excellent electrochemical performance of [email protected]@Co3O4-N/C can be ascribed to uniformly dispersed Co-Nx active sites, strong synergistic effects between N-doped carbon support and [email protected]@Co3O4 as well as ordered mesoporous structure, boosting mass transfer and accelerating electrocatalytic reaction.



中文翻译:

钴和钴氧化物N-共掺杂的多孔碳,衍生自金属-有机骨架,作为双功能催化剂,用于氧还原和氧释放反应

衍生自金属-有机骨架(MOF)的过渡金属/金属氧化物-碳杂化物是有前途的具有成本效益的电催化剂,可代替贵金属催化剂进行氧还原反应(ORR)和氧释放反应(OER)。在此,通过Co-MOF([Co(INA)2 ]·0.5EtOH)(INA:异烟酸)的两步热处理来制备[受电子邮件保护的] @Co 3 O 4 -N / C。首先,将Co-MOF作为前驱体在N 2气氛中于不同温度下热解,以获得Co-N / CT(T = 700、800、900°C)材料,其中Co-N / C-800显示出非常高的ORR活动。经过氧化处理后,Co-N / C-800转化为[受电子邮件保护] @Co 3 O 4-N / C对ORR和OER均表现出增强的电催化活性。所获得的[受电子邮件保护] @Co 3 O 4 -N / C比Co-N / C具有更高的正启动电位(-0.136 V vs. Ag / AgCl)和更高的极限电流密度(4.9 mA cm -2) -800(相对于Ag / AgCl和−3.943 cm -2为−0.143 V ),并且对ORR的耐甲醇性和稳定性优于Pt / C(63.2%)(80.0%)。[电子邮件保护] @Co 3 O 4 -N / C还显示出出色的OER性能,在10 mA cm -2的电流密度下,其过电势(450 mV)比Co-N / C-800(492 mV)低。[受电子邮件保护] @Co 3 O 4的优异电化学性能-N / C可以归因于均匀分散的Co-N x活性位点,N掺杂碳载体和[email protected] @Co 3 O 4之间的强协同作用以及有序的介孔结构,从而促进了传质并加速了电催化反应。

更新日期:2018-03-13
down
wechat
bug