Engineering bimetal Cu, Co sites on 3D N-doped porous carbon nanosheets for enhanced oxygen reduction electrocatalysis

Abstract

The 3D mesoporous Cu,Co-N-C nanosheets architectures are fabricated, showing greatly enhanced catalytic activity and stability toward ORR relative to their mono-metallic counterparts. Such superiority results from the synergistic interplay of...

Dual-Template Construction of Iron–Nitrogen-Codoped Hierarchically Porous Carbon Electrocatalyst for Oxygen Reduction Reaction

“…All curves exhibited two obvious peaks at around 1340 and 1580 cm –1 , and the former corresponded to the disorder vibration mode of the structural defects (D band), while the latter was assigned to a well-ordered scattering of the graphitic carbon atoms (G band). A higher I D / I G ratio could indicate more structural defects in the carbon matrix. , By comparison, the I D / I G ratio for Fe-N-HPC-0.05 was 1.653, which was higher than those for Fe-N-HPC-0.03 ( I D / I G =1.506) and Fe-N-HPC-0.07 ( I D / I G = 1.527), further demonstrating that more structural defects in Fe-N-HPC-0.05 could act as reactive sites for promoting the ORR catalytic performance. Based on the above analysis, it can be considered that the Fe-N-HPC-0.05 structure catalyst had been successfully prepared, which could possess a superior ORR performance.…”

“…A higher I D /I G ratio could indicate more structural defects in the carbon matrix. 12,24 By comparison, the I D /I G ratio for Fe-N-HPC-0.05 was 1.653, which was higher than those for Fe-N-HPC-0.03 (I D /I G =1.506) and Fe-N-HPC-0.07 (I D /I G = 1.527), further demonstrating that more structural defects in Fe-N-HPC-0.05 could act as reactive sites for promoting the ORR catalytic performance. Based on the above analysis, it can be considered that the Fe-N-HPC-0.05 structure catalyst had been successfully prepared, which could possess a superior ORR performance.…”

“…Usually, the M–N–C catalysts involving a variety of metal species are prepared using high-temperature heat treatment. After the pyrosis process, the agglomeration of metals occurs inevitably and numerous active sites are buried in the carbon, which leads to low utilization efficiency of those catalysts. , An accurate construction of hierarchically porous carbon nanostructures (HPCNs) can efficiently enhance the ORR activity by providing better mass transport/diffusion, access to more active sites, and faster electron transfer. , To synthesize those unique structures, various approaches have been introduced, such as hard and soft template methods, self-assembly techniques, and other efficient strategies. , At present, an efficient SiO 2 -templated strategy was adapted to construct HPCNs, which could create abundant pore structures and promote the exposure of active sites for ORR. , Moreover, rationally designing highly active species in HPCNs is considered as a challenge for enhancing the catalytic activity of HPCNs . The previous works have proven that MN x , metal nitride/carbide, and carbon-encapsulated metal nanoparticles could serve as available active sites and exhibit obvious ORR activities. − More importantly, the synergistic effects among these active species can result in the higher ORR activity of electrocatalysts revealed by theoretical and experimental results. , On this basis, it is ideal to synthesize highly active species in HPCNs.…”

“…9,10 An accurate construction of hierarchically porous carbon nanostructures (HPCNs) can efficiently enhance the ORR activity by providing better mass transport/diffusion, access to more active sites, and faster electron transfer. 11,12 To synthesize those unique structures, various approaches have been introduced, such as hard and soft template methods, self-assembly techniques, and other efficient strategies. 13,14 At present, an efficient SiO 2 -templated strategy was adapted to construct HPCNs, which could create abundant pore structures and promote the exposure of active sites for ORR.…”

Bimetallic CuCo@Nitrogen/Carbon Nanoparticles as a Cathode Catalyst for Magnesium‐Air Batteries

“…[22,24,25] The high-resolution C 1s spectrum is displayed in Figure 3d and the peaks at 284.8, 286.0, 286.7 and 289.1 eV are corresponded to CÀ C, CÀ N, CÀ O and O=CÀ O, respectively. [32,37,38] The presence of Cu 2p and Co 2p in as-prepared electrocatalysts demonstrates the formation of CuCo-based compound. The N 1s and C 1s spectra show the N element exists the surface and the interior structure of electrocatalysts consisted of CuÀ N or CoÀ N and CÀ N bonds.…”