Three octamolybdate-templated inorganic–organic hybrid frameworks based on dinuclear/tetranuclear metal-tetrazole clusters

Xu, Li; Chen, Yu; Chi, Xiao-Lin; Xu, Yuci; Yang, Qi; Zhang, Hua-Yi; Zhang, Jinlin; Xiao, Dong‐Rong

doi:10.1016/j.ica.2015.08.021

Cited by 12 publications

(1 citation statement)

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“…Thus, an infinite energy barrier of the ORR has become one of the most important factors limiting the performance of fuel cells [ 3 , 6 – 8 ]. So far, Pt-based materials have been regarded as one of the most active catalysts for the ORR and they can be commercially available at present [ 9 – 12 ]. Pt-based catalysts are highly effective, but they are subjected to some drawbacks including high cost, limited resources and the crossover to methanol.…”

Section: Introductionmentioning

confidence: 99%

Creation of Triple Hierarchical Micro-Meso-Macroporous N-doped Carbon Shells with Hollow Cores Toward the Electrocatalytic Oxygen Reduction Reaction

et al. 2017

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A series of triple hierarchical micro-meso-macroporous N-doped carbon shells with hollow cores have been successfully prepared via etching N-doped hollow carbon spheres with CO2 at high temperatures. The surface areas, total pore volumes and micropore percentages of the CO2-activated samples evidently increase with increasing activation temperature from 800 to 950 °C, while the N contents show a contrary trend from 7.6 to 3.8 at%. The pyridinic and graphitic nitrogen groups are dominant among various N-containing groups in the samples. The 950 °C-activated sample (CANHCS-950) has the largest surface area (2072 m2 g−1), pore volume (1.96 cm3 g−1), hierarchical micro-mesopore distributions (1.2, 2.6 and 6.2 nm), hollow macropore cores (~91 nm) and highest relative content of pyridinic and graphitic N groups. This triple micro-meso-macropore system could synergistically enhance the activity because macropores could store up the reactant, mesopores could reduce the transport resistance of the reactants to the active sites, and micropores could be in favor of the accumulation of ions. Therefore, the CANHCS-950 with optimized structure shows the optimal and comparable oxygen reduction reaction (ORR) activity but superior methanol tolerance and long-term durability to commercial Pt/C with a 4e−-dominant transfer pathway in alkaline media. These excellent properties in combination with good stability and recyclability make CANHCSs among the most promising metal-free ORR electrocatalysts reported so far in practical applications. Electronic supplementary materialThe online version of this article (doi:10.1007/s40820-017-0157-1) contains supplementary material, which is available to authorized users.

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