Modulating Built‐In Electric Field Via N‐Doped Carbon Dots for Robust Oxygen Evolution at Large Current Density

Abstract Constructing a built‐in electric field (BIEF) within heterostructures has emerged as a compelling strategy for advancing electrocatalytic oxygen evolution reaction (OER) performance. Herein, the p‐n type nanosheet array heterojunction Ni 2 P‐NCDs‐Co(OH) 2 ‐NF are successfully prepared. The variation in interaction affinity between nitrogen within N‐doped carbon dots (NCDs) and Ni/Co induces charge redistribution between Co and Ni in the Ni 2 P‐NCDs‐Co(OH) 2 ‐NF‐3 heterostructure, thereby enhancing the intensity of the BIEF, facilitating electron transfer, and markedly improving OER activity. The optimized electrocatalyst, Ni 2 P‐NCDs‐Co(OH) 2 ‐NF‐3, demonstrates a remarkably low overpotential of 389…

• NN
  National Natural Science Foundation of China

  Awards: 22202169, 51678291