当前位置: X-MOL 学术Catal. Sci. Technol. › 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.)
MnFe2O4@nitrogen-doped reduced graphene oxide nanohybrid: an efficient bifunctional electrocatalyst for anodic hydrazine oxidation and cathodic oxygen reduction
Catalysis Science & Technology ( IF 5 ) Pub Date : 2017-10-27 00:00:00 , DOI: 10.1039/c7cy01844d
Santimoy Khilari 1, 2, 3, 4 , Debabrata Pradhan 1, 2, 3, 4
Affiliation  

The direct hydrazine fuel cell (DHFC) emerges as a promising tool to produce electricity without any carbon emission. The electrocatalyst plays a role central to the performance of the DHFC. Thus, development of cost-effective bifunctional electrocatalysts remains a key to make this technology practically viable. Herein, we report a single-step hydrothermal synthesis route to couple MnFe2O4 nanoparticles (NPs) with nitrogen-doped reduced graphene oxide (h-MnFe2O4 NPs/N-rGO) and demonstrate its bifunctional role as an electrocatalyst for both anodic hydrazine electrooxidation and cathodic reduction of molecular oxygen. The as-synthesized h-MnFe2O4 NPs/N-rGO composite not only catalyzes hydrazine electrooxidation via a quasi-4-electron pathway (n = 3.94) with a small Tafel slope (106 mV decade−1) but is also capable of reducing molecular oxygen through an efficient 4-electron pathway. The oxygen reduction performance of the present composite is found to be comparable to that of the state-of-the-art Pt/C catalyst. In addition, the bifunctional electrocatalytic behavior of the h-MnFe2O4 NPs/N-rGO composite is found to be superior to those of MnFe2O4 NPs/rGO, pristine MnFe2O4 NPs, N-rGO alone, and the physical mixture of MnFe2O4 NPs and N-rGO. The improved electrocatalytic efficiency of the h-MnFe2O4 NPs/N-rGO composite originates from the synergetic physicochemical properties of MnFe2O4 NPs and N-rGO, which facilitates analyte diffusion, reduces charge transfer resistance, and offers a greater number of active sites for the catalytic reactions.

中文翻译:

MnFe 2 O 4 @氮掺杂的还原氧化石墨烯纳米杂化物:一种用于阳极肼氧化和阴极氧还原的高效双功能电催化剂

直接肼燃料电池(DHFC)作为一种有前途的发电工具而无碳排放。电催化剂在DHFC的性能中起着核心作用。因此,开发具有成本效益的双功能电催化剂仍然是使该技术切实可行的关键。本文中,我们报告了一步一步水热合成路线,以将MnFe 2 O 4纳米颗粒(NPs)与氮掺杂的还原氧化石墨烯(h-MnFe 2 O 4 NPs / N-rGO)偶联,并证明了其作为电催化剂的双功能作用。阳极肼电氧化和分子氧的阴极还原。刚合成的h-MnFe 2 O 4NPs / N-rGO复合材料不仅可以通过准4电子途径(n = 3.94)催化Tasel斜率小(106 mV October -1)的肼电氧化反应,而且还能够通过有效的4电子还原分子氧途径。发现本发明复合材料的氧还原性能与现有技术的Pt / C催化剂相当。此外,发现h-MnFe 2 O 4 NPs / N-rGO复合材料的双功能电催化性能优于MnFe 2 O 4 NPs / rGO,原始MnFe 2 O 4 NPs,单独的N-rGO和MnFe 2的物理混合物O 4个NP和N-rGO。h-MnFe 2 O 4 NPs / N-rGO复合材料电催化效率的提高源自MnFe 2 O 4 NPs和N-rGO的协同理化性质,有助于分析物的扩散,降低电荷转移阻力,并提供更多的催化反应的活性位点。
更新日期:2017-11-10
down
wechat
bug