Transition metal phosphides (TMPs) nanostructures have emerged as important electroactive materials for energy storage and conversion. Nonetheless, the phase modulation of iron/nickel phosphides nanocrystals or related nanohybrids remains challenging, and their electrocatalytic overall water splitting (OWS) performances are not fully investigated. Here, the phase-controlled synthesis of iron/nickel phosphides nanocrystals "armored"

The 3D mesoporous Cu,Co-N-C nanosheets architectures are fabricated, showing greatly enhanced catalytic activity and stability toward ORR relative to their mono-metallic counterparts. Such superiority results from the synergistic interplay of...

Designing defect-rich multimetallic layered double hydroxide (LDH)-based nanohybrids and integrating them into particular device configuration are paramount to develop high-performance hybrid supercapacitors (HSCs) but remain a great challenge. Herein, oxygen-vacancy-rich NiMnZn-LDH/Mo2CT x 2D-on-2D nanohybrids are fabricated through electrostatic assembly of alkaline-etched NiMnZn-LDH (eLDH) nanosheets and exfoliated Mo2CT x MXene. The alkaline etching creates more oxygen vacancies and regulates the valence states of Ni/Mn active elements in eLDH. After “marrying” with the Mo2CT x MXene, the strong interplay of these two components will further modulate the surface electronic structure of eLDH, promote charge transport between interfaces, and increase the content of oxygen vacancies that can provide more accessible active sites for a Faradaic reaction. Thus, the obtained eLDH/Mo2CT x nanohybrids show a greatly enhanced specific capacity (1577 C g–1 at 2 A g–1) relative to pure eLDH, Mo2CT x , and initial NiMnZn-LDH. Also, the cycling stability of eLDH/Mo2CT x nanohybrids outperforms their monocomponent counterparts. Moreover, employing such 2D-on-2D nanohybrids as a positive electrode while pairing iron oxide (Fe2O3)/carbon nanotube nanohybrids as a negative electrode, three kinds of all-solid-state HSCs are further fabricated with the positive–negative-type, positive–negative–positive-type, and negative–positive–negative-type device geometries. Among them, the positive–negative–positive-type device exhibits an ultrahigh energy density (92.6 Wh kg–1 at 2695 W kg–1), superior to the positive–negative-type and negative–positive–negative-type devices and most of the other reported HSCs ones. This work may spur the development of defect-rich multimetallic LDH-based 2D nanohybrids and promote their applications in all-solid-state HSCs or other clean energy apparatuses.