Loading...

In-situ stabilization of metal-nitride sites in sprouted 2D cMOF@LDHs hetero-nano petals on metaloxynitrides nanostems for enhanced water splitting

Rezaee, S ; Sharif University of Technology | 2024

13 Viewed
  1. Type of Document: Article
  2. DOI: 10.1016/j.jcis.2024.05.180
  3. Publisher: 2024
  4. Abstract:
  5. Addressing the challenges of enhancing water-splitting efficiency necessitates the exploration and rational design of high-performance and durable electrocatalysts with appealing nanoarchitectures. In this study, we present the design and fabrication of conjugated cMOF/LDH hetero-nano petals decorated with monodispersed Metal-N sites, which are uniformly shelled over tungsten oxynitride (WNO) nanowire arrays to form a unique core–shell architecture. For this rational engineering, WNO nanowire arrays were grown on carbon cloth. Then, a thin-layered Ru-Co-Fe layered double hydroxide (RuCoFe/LDH) was deposited around these wires, resulting in a highly porous three-dimensional array of hierarchical hetero RuCoFe-LDHs@WNO-NWs core–shell nanowires (RuCoFe-NSs@WNO-NWs). Subsequently, the linkers coordinated with the RuCoFe-LDH nanosheets and transformed them in-situ into the RuCoFe-cMOF nano petals (RuCoFe-NPs@WNO-NWs). Notably, the linker's amino groups functioned as hooks for precisely anchoring and stabilizing metal sites, forming the metal nitride (M-N) moieties. Interestingly, the designed bi-functional catalyst exhibited superior catalytic activities for both OER (230 mV @ 10 mAcm−2) and HER (49 mV @ 10 mAcm−2) in an alkaline medium. Additionally, an electrolyzer cell employing Ru-CoFe-NPs@WNO-NWs as a bi-functional electrocatalyst required 1.49V to reach a current density of 10 mA cm−2. These remarkable catalytic performances can be attributed to several key factors, including opulent exposed active sites, an efficient charge/mass transport pathway, an optimized electronic structure, and an interfacial synergy effect. Hence, this study provides a new perspective for the design of efficient bi-functional electrocatalysts for use in the energy related electrochemical devices. © 2024 Elsevier Inc
  6. Keywords:
  7. Catalyst activity ; Cobalt alloys ; Crystalline materials ; Electrolysis ; Electronic structure ; Iron alloys ; Iron compounds ; Nanowire ; Nitrides ; Organometallics ; Ruthenium compounds ; Ternary alloys ; Tungsten compounds ; Cobalt ; Hydroxide ; Iron ; Nanomaterial ; Nanopetal ; Nanosheet ; Nitrogen ; Ruthenium ; Sea water ; Tungsten oxynitride ; Two dimensional conductive metal organic framework ; Unclassified drug ; Carbon ; Lactate dehydrogenase ; Metal ; Tungsten ; Bi-functional ; Bi-functional electrocatalyst ; Conductive metal-organic framework ; Layered-double hydroxides ; Metal nitrides ; Metalorganic frameworks (MOFs) ; Situ stabilization ; Water splitting ; Brunauer Emmett Teller method ; Chemical structure ; Chronoamperometry ; Chronopotentiometry ; Comparative study ; Controlled study ; Current density ; Cyclic voltammetry ; Electrochemical analysis ; Energy dispersive X ray spectroscopy ; Field emission scanning electron microscopy ; Fourier transform infrared spectroscopy ; Heat treatment ; Impedance spectroscopy ; Linear sweep voltammetry ; Pore size distribution ; Porosity ; Reaction time ; Surface area ; Surface property ; Thermogravimetry ; Thermostability ; Transmission electron microscopy ; Valence (chemistry) ; X ray absorption near edge structure spectroscopy ; X ray diffraction ; X ray photoemission spectroscopy ; Catalysis ; Drug development ; Petal ; Signal transduction ; Electrocatalysts
  8. Source: Journal of Colloid and Interface Science ; Volume 671 , 2024 , Pages 394-409 ; 00219797 (ISSN)
  9. URL: https://www.sciencedirect.com/science/article/abs/pii/S0021979724011688