文献类型：期刊文献

英文题名：Development of g-C3N4 activated hollow carbon spheres with good performance for oxygen reduction and selective capture of acid gases

作者：He, Bing[1,3];Liu, Fujian[1];Liu, Yong[2];Yan, Shouke[3]

机构：[1]Shaoxing Univ, Dept Chem, Zhejiang Key Lab Alternat Technol Fine Chem Proc, Shaoxing 312000, Zhejiang, Peoples R China;[2]Henan Univ, Coll Chem & Chem Engn, Henan Key Lab Polyoxometalate Chem, Kaifeng 475004, Peoples R China;[3]Beijing Univ Chem Technol, State Key Lab Chem Resource Engn, Beijing 100029, Peoples R China

年份：2019

卷号：324

外文期刊名：ELECTROCHIMICA ACTA

收录：SCI-EXPANDED(收录号：WOS:000489840900015)、、WOS

基金：This work was supported by National Natural Science Foundation of China (grant no. 21978052, 21573150, 21203122) and the Natural Science Foundation of Zhejiang Province (LY15B030002, LQ18E030001).

语种：英文

外文关键词：Nitrogen-doped; Hollow carbon nanospheres; g-C3N4 fast activation; Oxygen reduction reaction; Acid gases capture

外文摘要：A variety of nitrogen-doped hollow carbon nanospheres (A-NHCN-Ts, where T stands for activation temperature) with abundant microporosity were developed by us in this work. The A-NHCN-Ts were synthesized from carbonization of silica-resorcinol formaldehyde core-shell composites (silica@RF). The resulting silica@carbon core-shell composites were then treated with KOH to enrich microporosity, fast activation with g-C3N4 to improve nitrogen-doping, and etched with HF to removal silica core. The silica@RF was synthesized from coating of silica nanosphere with resorcinol-formaldehyde resin in presence of hexamethylenetetramine crosslinker. A-NHCN-Ts exhibit hollow and uniform sphericity, large BET surface areas (704-1043 m(2)/g) and hierarchical porosity. Abundant nitrogen sites (11.6-14.8 wt%) with high percentages of pyridinic-N (55-70%) were doped in A-NHCN-Ts. As a result, A-NHCN-Ts can be used as high-efficient and long-lived electrocatalysts in oxygen reduction reaction (ORR). The reduction potential of A-NHCN-Ts activated at 800 degrees C (A-NHCN-800) is 0.8 V versus reversible hydrogen electrode (vs. RHE) in alkaline electrolyte, with a half-wave potential of 0.81 V (vs. RHE), an onset potential of 0.9 V (vs. RHE) and a limiting current density of 3.63 mA cm(-2) at a rotation of 1600 rpm, respectively. A-NHCN-800 exhibits comparable ORR activity, enhanced methanol tolerance and superb stability in comparison with commercial Pt/C (20%). A-NHCN-Ts also show competitive properties in the capture of acid gases of SO2 and CO2, and the CO2 can be mildly catalyzed into cyclic carbonates over metalized A-NHCN-Ts. This work provides a novel g-C3N4 fast activation strategy for designing of high-efficient, multiple functional nanocarbon materials in both ORR, acid gases selective capture and conversion. (C) 2019 Elsevier Ltd. All rights reserved.