Bimetallic organic frameworks derived CuNi/carbon nanocomposites as efficient electrocatalysts for oxygen reduction reaction

Abstract

Catalysts of oxygen reduction reaction (ORR)play key roles in renewable energy technologies such as metal-air batteries and fuel cells. Despite tremendous efforts, highly active catalysts with low cost remain elusive. This work used metal-organic frameworks to synthesize non-precious bimetallic carbon nanocomposites as efficient ORR catalysts. Although carbon-based Cu and Ni are good candidates, the hybrid nanocomposites take advantage of both metals to improve catalytic activity. The resulting molar ratio of Cu/Ni in the nanocomposites can be finely controlled by tuning the recipe of the precursors. Nanocomposites with a series of molar ratios were produced, and they exhibited much better ORR catalytic performance than their monometallic counterparts in terms of limited current density, onset potential and half-wave potential. In addition, their extraordinary stability in alkaline is superior to that of commercially-available Pt-based materials, which adds to the appeal of the bimetallic carbon nanocomposites as ORR catalysts. Their improved performance can be attributed to the synergetic effects of Cu and Ni, and the enhancement of the carbon matrix.

Bimetallic zeolite imidazolate framework for enhanced lithium storage boosted by the redox participation of nitrogen atoms

“…To improve the performance of ZIFs as anode materials for LIBs, we focus our attention on bimetallic ZIF to utilize the synergistic effect of two metal centers inspired by our previous work [16,[27][28][29]. To demonstrate the effectiveness of our bimetallic ZIF, we also synthesize the isostructural Zn-ZIF-8 and Co-ZIF-67 under a similar solvothermal approach by using 2-methylimidazole as the linker.…”

Tuning optical properties of MOF-based thin films by changing the ligands of MOFs

“…These are crystalline materials consisting of metal ions or clusters and organic linker(s) with strong covalent bonds [6,7]. Due to their high porosity, large internal surface area, and high thermal stability (generally >300°C) [7], MOFs have a variety of potential applications in many fields including gas storage [8], catalysis [9,10], drug delivery [11], and chemical sensing [12][13][14]. The intrinsic ultra-high porosity of MOFs may lead to a low RI of MOF materials.…”

One-step synthesis of the PdPt bimetallic nanodendrites with controllable composition for methanol oxidation reaction

“…By comparison, given that Pd and Pt have nearly the same structures (the same group of the periodic table, the face-centered cubic (fcc) crystal structure and the similar lattice constants) [27,28], the PdPt bimetallic nanoparticles (NPs) are especially attractive for catalyzing multiple reactions due to the presence of the powerful catalytic components of Pd and Pt. Meanwhile, the incorporation of Pd into Pt-based bimetals can not only significantly reduce the cost of the catalysts by decreasing the amount of Pt, but also enhance the catalytic properties while reducing the CO poisoning effect due to a strong coupling between these two metals [8,29].…”