Effect of carbon nanofiber surface functional groups on oxygen reduction in alkaline solution

One-dimensional nitrogen-containing carbon nanostructures

“…As the surface of the abovementioned PANI-derived nanocarbons is generally rich in oxygen functionalities, too, some of these surface groups can also contribute capacitive and ORR performance. Indeed, just recently introduction of O-functionalities on CNFs has been confirmed to improve ORR kinetics in alkaline solution, but not as much as N-containing surface groups [567]. This was also confirmed in the case of hydrothermally treated carbonized PANI, pointing that certain kind of synergy might exist between N and O surface functionalities when it comes to ORR catalysis in alkaline media [643].…”

“…The gradual heating (room temperature to 700 °C at a rate of 5 °C min -1 ) combined with constant temperature heating (1 h at 700 °C) of the mixture of acid-treated fishbone CNFs and melamine in a crucible with a lid placed in a corundum tube with nitrogen flow has led to NCNFs [567]. Similarly, thermal treatment of hierarchically porous CNFs containing a20 at% electroactive oxygen atoms, prepared by the controlled carbonization and chemical activation, with melamine resulted in the hierarchically porous NCNFs with 9.1 at% nitrogen and improved electrical/electrochemical properties [568].…”

Modified multi-walled carbon nanotube/Ag nanoparticle composite catalyst for the oxygen reduction reaction in alkaline solution

“…So preparation of an alternative catalyst material with low cost and high electrochemical catalytic activity toward the ORR in the alkaline medium is urgently needed. Various catalysts have been investigated to improve the kinetics and the proportion of four-electron pathway during the ORR, such as noble metals [5][6][7][8][9][10][11][12][13], metal oxides [14][15][16] and carbon based nanomaterials [17][18][19]. Among these catalytic materials studied before, the Ag or Ag/C is supposed to be a competitive material to replace the Pt due to its relative low cost and high activity toward the ORR in alkaline medium [20][21][22][23][24][25][26].…”

Effects of Surface Modification of Carbon Nanofibers on Their Electro- catalytic Activity for Hydrogen Evolution Reaction of Water Electrolysis

“…传统的析氢阴极材料 (如 低碳钢) [6] 、甲酸氧化反应 [7] 以及乙醇氧化反应 [8] 等. 大量 研究报道 [9,10] , 对纳米碳材料(石墨烯 [ 如图 1(a)所示, 这里将 B-CNF-OX 的 C1s 峰分成了 4 个峰 [19] , 主峰(peak 1)位于 284.8 eV, 其主要是由 B-CNF-OX 表面的石墨层结构的碳原子组成; 第二个峰 (peak 2)位于 285.4 eV, 可能是由 B-CNF-OX 中缺陷位 置的烃类 C-C 键中 C 原子组成 [20] ; 第三个峰(peak 3) 从图 2 中可以看出, N1s 峰可以分成两个峰: peak 1 位于 400.0 eV, 归属于 CNF-ON 表面的吡咯型氮; peak 2 位于 400.9 eV, 归属于 CNF-ON 表面的石墨层氮 [19] . 从 XPS 分析结果中我们可以发现 N 元素已经成功地掺杂 到 CNF 表面, 且主要是以吡咯型和石墨层氮的形式掺 入.…”