Fe‐Induced Electronic Transfer and Structural Evolution of Lotus Pod‐Like CoNiFeP_x@P,N‐C Heterostructure for Sustainable Oxygen Evolution

Abstract

Transition metal phosphides with metallic properties are a promising candidate for electrocatalytic water oxidation, and developing highly active and stable metal phosphide‐based oxygen evolution reaction catalysts is still challenging. Herein, we present a facile ion exchange and phosphating processes to transform intestine‐like CoNiPx@P,N‐C into lotus pod‐like CoNiFePx@P,N‐C heterostructure in which numerous P,N‐codoped carbon‐coated CoNiFePx nanoparticles tightly anchors on the 2D carbon matrix. Meanwhile, the as‐prepared CoNiFePx@P,N‐C enables a core‐shell structure, high specific surface area, and hierarchical pore structure, which present abundant heterointerfaces and fully exposed active sites. Notably, the incorporation of Fe can also induce electron transfer in CoNiPx@P,N‐C, thereby promoting the oxygen evolution reaction. Consequently, CoNiFePx@P,N‐C delivers a low overpotential of 278 mV (vs RHE) at a current density of 10 mA cm−1 and inherits excellent long‐term stability with no observable current density decay after 30 h of chronoamperometry test. This work not only highlights heteroatom induction to tune the electronic structure but also provides a facile approach for developing advanced and stable oxygen evolution reaction electrocatalysts with abundant heterointerfaces.

A-Site Engineering of the High-Entropy Perovskite Pr0.4La0.4Ba0.4Sr0.4Ca0.4Fe2O5+δ Cathode for Intermediate-Temperature SOFCs

“…The reduction in R p in PLBSCF is attributed to its elevated oxygen vacancy concentration and superior conductivity. These factors collectively accelerate the electrochemical reaction process, ,, as supported by the analysis of XPS, TG, and electrical conductivity. In Figure b, the activation energies for PBF and PLBSCF are 40.55 and 45.13 kJ·mol –1 , respectively, both of which are lower than that of PBSCF (57.16 kJ·mol –1 ).…”

Supramolecular Macrocycle Regulated Single‐Atom MoS2@Co Catalysts for Enhanced Oxygen Evolution Reaction

“…Oxygen evolution reaction (OER) in anode consumes 90% of the driving energy since it suffers from a high kinetic barrier caused by four electron transfer process, [1][2][3][4][5][6][7] which is a crucial reaction involved in CO 2 and N 2 reduction, metal-air batteries and other energy conversion systems. [4] The high consumption and unsustainability of current noble metal oxide electrocatalysts for OER further proved a stumbling block for commercial applications.…”

“…Particularly, cobalt-based OER electrocatalysts such as cobalt sulfides, [17][18][19] cobalt oxides/hydroxides [12,[20][21][22][23][24][25][26][27] and single cobalt sites [3,13,[27][28][29][30] have attracted considerable attention. Various design strategies concerning vacancy/defect tailoring, [13,18,28,[30][31][32][33] doping [8,13,14,17,30,31,[34][35][36] and heterojunction engineering, [4,18,21,23,[37][38][39][40] as well as strain tuning engineering [16,32] have been exploited.…”