Current and future trends for spinel-type electrocatalysts in electrocatalytic oxygen evolution reaction

Coordination Chemistry Reviews, Journal Year: 2022, Volume and Issue: 475, P. 214869 - 214869

Published: Oct. 14, 2022

Language: Английский

---

Simultaneously Engineering the Synergistic-Effects and Coordination-Environment of Dual-Single-Atomic Iron/Cobalt-sites as a Bifunctional Oxygen Electrocatalyst for Rechargeable Zinc-Air Batteries

ACS Catalysis, Journal Year: 2023, Volume and Issue: 13(4), P. 2313 - 2325

Published: Jan. 30, 2023

Single-atom introduced carbon nanomaterials show favorable oxygen-reduction reaction (ORR) and oxygen-evolution (OER) performance for renewable energy applications. Nevertheless, the electronic-structure regulation by decorating heterogeneous single-metal-atoms engineering of a single-atom active-sites' microenvironment need to be optimized simultaneously, which is challenging. Herein, we develop an atomic-interfacial-regulation approach fabricate dual single Fe/Co atoms synchronized with both nitrogen/sulfur on defective/graphitic/porous nanosheets (Fe,Co/DSA-NSC). The unsymmetrically organized N S coordinated bridged atomic-sites [Fe-(N2S)/Co-(N2S) moiety] are established prompt charge-transfer, lowering barrier oxygenated reaction-intermediates leading boost reaction-kinetics. As estimated, Fe,Co/DSA-NSC exhibits improved ORR/OER activity higher half-wave potential lower overpotential (E1/2 = 879 mV η10 210 mV, respectively) also good cycling stability toward zinc-air batteries. This discovery hence provides widespread scheme synergistic-principles dual-single-atom catalysts controlled

Language: Английский

---

Race on engineering noble metal single-atom electrocatalysts for water splitting

International Journal of Hydrogen Energy, Journal Year: 2022, Volume and Issue: 47(31), P. 14257 - 14279

Published: March 23, 2022

Language: Английский

---

Operando Identification of Active Species and Intermediates on Sulfide Interfaced by Fe₃O₄ for Ultrastable Alkaline Oxygen Evolution at Large Current Density

ACS Catalysis, Journal Year: 2022, Volume and Issue: 12(8), P. 4318 - 4326

Published: March 28, 2022

Transition-metal sulfides are investigated as promising electrocatalysts for oxygen evolution reaction (OER) in alkaline media; however, the real active species remain elusive and development of oxyhydroxides reconstructed from delivering stable large current density at low applied potentials is a great challenge. Here, we report synergistic hybrid catalyst, composed nanoscale heterostructures Co9S8 Fe3O4, that exhibits only potential 350 mV record stability 120 h 500 mA cm–2 1.0 M KOH. Voltage-dependent soft X-ray absorption spectroscopy (XAS) Operando Raman demonstrate initial Co9S8@Fe3O4 into CoOOH/CoOx@Fe3O4 further to complete CoOOH@Fe3O4. XAS electron microscopy imaging analyses reveal completely CoOOH acts Fe3O4 components prevent aggregation CoOOH. infrared indicates cobalt superoxide (*OOH) intermediates during OER process. Density functional theory calculations formation *OOH rate-determining step CoOOH@Fe3O4 lower energy barrier OER. Our results provide an in-depth understanding dynamic surface structure evolutions sulfide insights design excellent nanocatalysts density.

Language: Английский

---

Iridium single-atom catalyst for highly efficient NO electroreduction to NH3

Nano Research, Journal Year: 2023, Volume and Issue: 16(7), P. 8737 - 8742

Published: March 8, 2023

Language: Английский

---

Synergistic coupling of FeNi3 alloy with graphene carbon dots for advanced oxygen evolution reaction electrocatalysis

Journal of Colloid and Interface Science, Journal Year: 2022, Volume and Issue: 615, P. 273 - 281

Published: Jan. 22, 2022

Language: Английский

---

Engineering Heterostructured Pd–Bi₂Te₃ Doughnut/Pd Hollow Nanospheres for Ethylene Glycol Electrooxidation

Inorganic Chemistry, Journal Year: 2022, Volume and Issue: 61(10), P. 4533 - 4540

Published: March 2, 2022

The electrooxidation of ethylene glycol (EG) is vital significance for the conversion from biomass energy into electrical via direct fuel cells. However, EG oxidation reaction (EGOR) suffers poor efficiency due to limitation high-performance electrocatalysts cleaving C-C bonds. Herein, this successfully addressed by fabricating doughnut-shaped Pd-Bi2Te3 heterostructured catalyst. Notably, heterojunction nanocatalyst has been demonstrated be highly active toward EGOR with superb activity and durability, in which a mass as high 2420.8 mA mg-1 achieved alkaline media, being 1.7 times higher than that commercial Pd/C Upon combination experimental results mechanism studies, it indicated remarkable performance attributed enlarged areas stemmed doughnut-like structure, well strong synergistic effect Pd. More importantly, electroactive can accelerate charge transfer boost CO-like intermediates, are conducive enhancement electrochemical stability.

Language: Английский

---

Hierarchical Hollow CoWO₄–Co(OH)₂ Heterostructured Nanoboxes Enabling Efficient Water Oxidation Electrocatalysis

Inorganic Chemistry, Journal Year: 2022, Volume and Issue: 61(35), P. 14224 - 14232

Published: Aug. 24, 2022

Rational design and construction of well-defined hollow heterostructured nanomaterials assembled by ultrathin nanosheets overtakes crucial role in developing high-efficiency oxygen evolution reaction (OER) electrocatalysts. Herein, a reliable metal–organic framework-mediated cation-exchange strategy to tune the geometric structure multicomponent heterostructures has been proposed for fabrication CoWO4–Co(OH)2 hierarchical nanoboxes rich nanosheets. Benefiting from nanostructure, offer plenty metal active centers available intermediates. Moreover, nanointerfaces between CoWO4 Co(OH)2 can function as bridge boosting efficient electron transfer Co(OH)2. As consequence, optimized exhibit outstanding electrocatalytic performance toward OER delivering 10 mA cm–2 with low overpotential 280 mV small Tafel slope 70.6 dec–1 well electrochemical stability. More importantly, this nanocatalyst couple Pt/C drive overall water splitting achieve voltage 1.57 V.

Language: Английский

---

Sulfur vacancies engineered self-supported Co3S4 nanoflowers as an efficient bifunctional catalyst for electrochemical water splitting

Applied Catalysis B Environment and Energy, Journal Year: 2022, Volume and Issue: 322, P. 122104 - 122104

Published: Oct. 27, 2022

Language: Английский

---

Self-Tandem Electrocatalytic NO Reduction to NH₃ on a W Single-Atom Catalyst

Nano Letters, Journal Year: 2023, Volume and Issue: 23(5), P. 1735 - 1742

Published: Feb. 14, 2023

We design single-atom W confined in MoO3-x amorphous nanosheets (W1/MoO3-x) comprising W1-O5 motifs as a highly active and durable NORR catalyst. Theoretical operando spectroscopic investigations reveal the dual functions of to (1) facilitate activation protonation NO molecules (2) promote H2O dissociation while suppressing *H dimerization increase proton supply, eventually resulting self-tandem mechanism W1/MoO3-x greatly accelerate energetics NO-to-NH3 pathway. As result, exhibits highest NH3-Faradaic efficiency 91.2% NH3 yield rate 308.6 μmol h-1 cm-2, surpassing that most previously reported catalysts.

Language: Английский

---