Atomic Fe Dispersed on N‐Doped Carbon Hollow Nanospheres for High‐Efficiency Electrocatalytic Oxygen Reduction

Abstract

Exploration of high‐efficiency, economical, and ultrastable electrocatalysts for the oxygen reduction reaction (ORR) to substitute precious Pt is of great significance in electrochemical energy conversion devices. Single‐atom catalysts (SACs) have sparked tremendous interest for their maximum atom‐utilization efficiency and fascinating properties. Therefore, the development of effective synthetic methodology toward SACs becomes highly imperative yet still remains greatly challenging. Herein, a reliable SiO2‐templated strategy is elaborately designed to synthesize atomically dispersed Fe atoms anchored on N‐doped carbon nanospheres (denoted as Fe–N–C HNSs) using the cheap and sustainable biomaterial of histidine (His) as the N and C precursor. By virtue of the numerous atomically dispersed Fe–N4 moieties and unique spherical hollow architecture, the as‐fabricated Fe–N–C HNSs exhibit excellent ORR performance in alkaline medium with outstanding activity, high long‐term stability, and superior tolerance to methanol crossover, exceeding the commercial Pt/C catalyst and most previously reported non‐precious‐metal catalysts. This present synthetic strategy will provide new inspiration to the fabrication of various high‐efficiency single‐atom catalysts for diverse applications.

Designing AI‐Aided Analysis and Prediction Models for Nonprecious Metal Electrocatalyst‐Based Proton‐Exchange Membrane Fuel Cells

“…Ar easonable request for more (> 37.5 %) pyridinic and metallic Ni nt he Ne lement was proposed since these components have long been recognized to play important roles in constructing M-N x sites. [40] From the consensus reached by our decision tree with previous works in this field, AI has proven to be trustworthy as ar esearch consultant. Moreover,t he decision tree identified one unique determination.…”

Hofmann-like metal–organic-framework-derived PtxFe/C/N-GC composites as efficient electrocatalysts for methanol oxidation

“…It has been reported that N species play a crucial role in the electrocatalytic process, [43][44][45][46][47] with graphitic N working as an efficient active sites. [48][49][50][51] Hence, XPS was used to investigate the elemental compositions of Pt x Fe/C/N-GC-600, Pt x Fe/C/N-GC-700 and Pt x Fe/C/N-GC-800. The high-resolution N 1 s spectra of these three samples (see Fig.…”

Cobalt single atoms anchored on N-doped ultrathin carbon nanosheets for selective transfer hydrogenation of nitroarenes

“…During recent years, single-atom catalysis has become one of the most attractive new frontiers in catalysis as a model bridging homogeneous and heterogeneous catalysis [1][2][3][4][5][6][7]. With the aid of recent advances in synthetic methodologies, atomic-resolution characterization techniques and theoretical modelling, various single-atom catalysts (SACs) were produced and studied for catalysis [8][9][10][11][12][13][14][15][16][17][18][19][20]. Compared with clusters and nanocatalysts, SACs usually exhibit superior activity and excellent selectivity in a wide variety of catalytic reactions owing to their maximum atom efficiency, unsaturated coordinate environment and particular electronic structures [21][22][23][24][25][26][27][28].…”