High‐performance N, P‐CNL nanocomposites as catalyst for oxygen reduction reaction in fuel cell

Abstract

Summary Transition metal and heteroatom codoped carbon materials have become the most promising materials to replace commercial platinum carbon (Pt / C) catalysts due to their low cost, high stability, and methanol resistance. In this work, iron‐nitrogen and phosphorus codoped carbon nanorod‐layer composites (N, P‐CNL) derived from phosphorus‐doped polyaniline (P‐PANI) by phytic acid (PA) and iron salt were successfully obtained after high‐temperature pyrolysis. As a result, the N, P‐CNL materials exhibited good electrocatalytic performance due to abundant active sites. The N, P‐CNL with 50% mass filling ratio of iron salt (named as N, P‐CNL‐1:1) displayed an enhanced limiting current density of −5.97 mA cm−2 at 1600 rpm and outstanding onset potential (−0.004 V) and oxygen reduction peak potential (−0.144 V). In general, this work can give insights into understanding the mechanism of codoped catalysts and synthesis the catalyst with excellent long‐term stability and resistance to methanol crossover and poisoning better than commercial Pt/C.

Co‐N‐doped hierarchically ordered macro/mesoporous carbon as bifunctional electrocatalyst toward oxygen reduction/evolution reactions

“…Figure 5A and Table S2 exhibited that as-prepared catalysts mainly consisted of C, O, N, and Co. Nitrogen-doped acts a pivotal part in the electrocatalytic activity, which had been studied by numerous researchers. 39,40 The high-resolution N 1s spectrum of N-OMC, Co-N-OMC, and Co-N-3DOM/mC ( Figure 5B) could be fitted by four peaks corresponding to graphitic-N, pyrrolic-N, pyridinic-N, and pyridinic-N-oxide. [41][42][43] The high content of graphitic-N and pyridinic-N of Co-N-OMC and Co-N-3DOM/mC enhanced the catalytic performance.…”

Core‐shell FeCo N‐doped biocarbons as stable electrocatalysts for oxygen reduction reaction in fuel cells

“…[4][5][6] In the recent years, investigations on the low cost, highly active and stable non-noble catalysts [7][8][9][10] for fuel cells were comprehensively carried out. According to the earlier reports, 9,[11][12][13][14][15][16][17][18][19] the development of M-N-C (M = transition metals) catalysts was shown to be very promising toward ORR. Particularly, the synergy of bimetal catalysts with more active and stable sites was reported to exhibit surpassing ORR.…”

Salt‐recrystallization preparation of metal organic framework derived porous carbon support for highly‐efficient proton exchange membrane fuel cell

“…[1][2][3] Therefore, high Pt loading is required to provide a sufficiently high reaction rate in the cathode. 4 However, the precious metal Pt is costly and has limited reserves, which leads to the high cost of fuel cells. The activity of currently used non-Pt catalysts is not sufficient to support their commercial application 5,6 ; thus, improving the fuel cell power density under ultra-low Pt loading has become a research hotspot.…”

“…At present, the practical application of cathode catalyst for proton exchange membrane fuel cells (PEMFCs) is restricted by the slow kinetics of the oxygen reduction reaction (ORR) in a low‐temperature environment 1‐3 . Therefore, high Pt loading is required to provide a sufficiently high reaction rate in the cathode 4 . However, the precious metal Pt is costly and has limited reserves, which leads to the high cost of fuel cells.…”