1. Synergism and anion-cation dual chemical substitution in heterostructure sprouted on MXene enable high-efficiency and stable overall water splitting.
- Author
-
Lv, Zepeng, Fei, Jinshuai, You, Yang, Lv, Xuewei, Li, Qian, and Dang, Jie
- Subjects
HYDROGEN evolution reactions ,OXYGEN evolution reactions ,ANIONS ,CATALYTIC activity ,SPROUTS - Abstract
• A dual-site doping strategy is developed for efficient bifunctional catalysts. • Both optimized electronic structure and increased active species were achieved. • The N,Ni-Co 2 P@TC shows extraordinary stability at high current density. • Dual-site doped N,Ni-Co 2 P@TC exhibits enhanced catalytic activities for HER and OER. The exploration of novel, super-potent and low-cost electrocatalysts for water splitting has always been the kernel in the field of renewable sources. Herein, exfoliated Ti 3 C 2 T x MXenes work as a substrate to vertically grow polypore N,Ni-Co2P nanoarrays (N,Ni-Co2P@TC) through an in situ interface-growth strategy and subsequent phosphorization and nitridation. The well-defined heterointerfaces with positive and negative ions co-modulation as coupled hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) catalysts for efficient overall water splitting are investigated, which possesses excellent durability even at a large current density (±500 mA cm
-2 ). For HER, suitable H 2 O* and H* absorption energies and accelerated electronic transmission make N,Ni-Co2P@TC display a low overpotential of 27 mV at -10 mA cm-2 and Tafel slope of 38 mV dec‑1 in 1 mol/L KOH. For OER, the synergy of N,Ni-Co2P@TC with self-reconfiguration can give enhanced activity with a low overpotential of 232 mV at 10 mA cm-2 and a Tafel slope of 57 mV dec‑1 . Additionally, the excellent bifunctional activity allows easily combining for efficient overall water splitting with a low driving voltage (1.51 V) at 10 mA cm-2 , and the electrolyzer can be driven by a 1.5 V AAA battery. [ABSTRACT FROM AUTHOR]- Published
- 2023
- Full Text
- View/download PDF