21October2017

Nano-Micro Letters

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

Ruohao Xing1, 2, Tingsheng Zhou2, Yao Zhou2, Ruguang Ma2, Qian Liu2, 3, *, Jun Luo1, 3, Jiacheng Wang2, 3, *

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Nano-Micro Lett. (2018) 10: 3

First Online: 3 September 2017 (Article)

DOI:10.1007/s40820-017-0157-1

*Corresponding author. E-mail: qianliu@mail.sic.ac.cn ; jiacheng.wang@mail.sic.ac.cn

 

Abstract

 


Fig. 1 Scheme for the synthesis of CANHCS with hollow macroporous core and hierarchical micro/mesopores as highly active metal-free electrocatalysts with improved activity for the ORR via a direct 4-electron reaction pathway. (I) N-doping of HPS by thermal treatment in NH3, and (II) etching NHCS via the reaction with CO2 at high temperature to form micro-mesopores within the shells

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.


 

Keywords

Hierarchical pores; Hollow cores; N-doping; Electrocatalysis; Oxygen reduction reaction

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