Recent advances of noble-metal-free bifunctional oxygen reduction and evolution electrocatalysts

Chemical Society Reviews, Год журнала: 2021, Номер 50(13), С. 7745 - 7778

Опубликована: Янв. 1, 2021

Bifunctional oxygen reduction and evolution constitute the core processes for sustainable energy storage. The advances on noble-metal-free bifunctional electrocatalysts are reviewed.

Язык: Английский

---

Untangling the respective effects of heteroatom-doped carbon materials in batteries, supercapacitors and the ORR to design high performance materials

Energy & Environmental Science, Год журнала: 2021, Номер 14(4), С. 2036 - 2089

Опубликована: Янв. 1, 2021

Heteroatom-doped carbon materials (HDCMs) have been widely studied as some of the most prominent material candidates for use in a wide range applications, such batteries, supercapacitors (SCs), and oxygen reduction reaction (ORR).

Язык: Английский

---

Electrocatalytic Refinery for Sustainable Production of Fuels and Chemicals

Angewandte Chemie International Edition, Год журнала: 2021, Номер 60(36), С. 19572 - 19590

Опубликована: Фев. 19, 2021

Abstract Compared to modern fossil‐fuel‐based refineries, the emerging electrocatalytic refinery (e‐refinery) is a more sustainable and environmentally benign strategy convert renewable feedstocks energy sources into transportable fuels value‐added chemicals. A crucial step in conducting e‐refinery processes development of appropriate reactions optimal electrocatalysts for efficient cleavage formation chemical bonds. However, compared well‐studied primary (e.g., O 2 reduction, water splitting), mechanistic aspects materials design complex are yet be settled. To address this challenge, herein, we first present fundamentals heterogeneous electrocatalysis some reactions, then implement these establish framework by coupling situ generated intermediates (integrated reactions) or products (tandem reactions). We also set principles strategies efficiently manipulate reaction pathways.

Язык: Английский

---

Tip‐Enhanced Electric Field: A New Mechanism Promoting Mass Transfer in Oxygen Evolution Reactions

Advanced Materials, Год журнала: 2021, Номер 33(9)

Опубликована: Янв. 29, 2021

Abstract The slow kinetics of oxygen evolution reaction (OER) causes high power consumption for electrochemical water splitting. Various strategies have been attempted to accelerate the OER rate, but there are few studies on regulating transport reactants especially under large current densities when mass transfer factor dominates reactions. Herein, Ni x Fe 1– alloy nanocones arrays (with ≈2 nm surface NiO/NiFe(OH) 2 layer) adopted boost reactants. Finite element analysis suggests that high‐curvature tips can enhance local electric field, which induces an order magnitude higher concentration hydroxide ions (OH − ) at active sites and promotes intrinsic activity by 67% 1.5 V. Experimental results show a fabricated NiFe nanocone array electrode, with optimized composition, has small overpotential 190 mV 10 mA cm −2 255 500 . When calibrated area, electrode outperforms state‐of‐the‐art electrocatalysts. positive effect tip‐enhanced field in promoting is also confirmed comparing samples different tip curvature radii. It suggested this enhanced generic other catalysts.

Язык: Английский

---

Two‐Dimensional Porous Molybdenum Phosphide/Nitride Heterojunction Nanosheets for pH‐Universal Hydrogen Evolution Reaction

Angewandte Chemie International Edition, Год журнала: 2020, Номер 60(12), С. 6673 - 6681

Опубликована: Дек. 18, 2020

Abstract Herein, we present a new strategy for the synthesis of 2D porous MoP/Mo 2 N heterojunction nanosheets based on pyrolysis [PMo 12 O 40 ] 3− ‐melamine (PMo ‐MA) nanosheet precursor from polyethylene glycol (PEG)‐mediated assembly route. The heterostructure are ca. 20 nm thick and have plentiful pores (<5 nm). These structure features offer advantages to promote HER activity, including favorable water dissociation kinetics around as confirmed by theoretical calculations, large accessible surface nanosheets, enhanced mass‐transport ability pores. Consequently, exhibit excellent activity with low overpotentials 89, 91 89 mV achieve current density 10 mA cm −2 in alkaline, neutral acidic electrolytes, respectively. performance is superior commercial Pt/C at >55 medium >190 alkaline medium.

Язык: Английский

---

Surface Design Strategy of Catalysts for Water Electrolysis

Small, Год журнала: 2022, Номер 18(27)

Опубликована: Июнь 6, 2022

Abstract Hydrogen, a new energy carrier that can replace traditional fossil fuels, is seen as one of the most promising clean sources. The use renewable electricity to drive hydrogen production has very broad prospects for addressing and environmental problems. Therefore, many researchers favor electrolytic water due its green low‐cost advantages. reaction comprises oxygen evolution (OER) (HER). Understanding OER HER mechanisms in acidic alkaline processes contributes further studying design surface regulation catalysts. catalysts are mainly reviewed defects, doping, alloying, reconstruction, crystal structure, heterostructures. Besides, recent overall splitting also reviewed. Finally, this review paves way rational synthesis materials highly efficient electrocatalysis.

Язык: Английский

---

Water splitting performance of metal and non-metal-doped transition metal oxide electrocatalysts

Coordination Chemistry Reviews, Год журнала: 2022, Номер 474, С. 214864 - 214864

Опубликована: Окт. 12, 2022

Язык: Английский

---

Recent advances in electrocatalysis with phthalocyanines

Chemical Society Reviews, Год журнала: 2021, Номер 50(23), С. 12985 - 13011

Опубликована: Янв. 1, 2021

Applications of phthalocyanines (Pcs) in electrocatalysis-including the oxygen reduction reaction (ORR), carbon dioxide (CO2RR), evolution (OER), and hydrogen (HER)-have attracted considerable attention recently. Pcs their derivatives are more attractive than many other macrocycles as electrocatalysts since, although they structurally related to natural porphyrin complexes, offer advantages low cost, facile synthesis good chemical stability. Moreover, high tailorability structural diversity mean have great potential for application electrochemical devices. Here we review structure composition Pcs, methods analogues, well applications Pc-based heterogeneous electrocatalysts. Optimization strategies materials electrocatalysis ORR, CO2RR, OER HER proposed, based on mechanisms different reactions. We also discuss structure/composition-catalytic activity relationships Pc order identify future practical applications. Finally, opportunities challenges use molecular discussed.

Язык: Английский

---

Solvent-free microwave synthesis of ultra-small Ru-Mo2C@CNT with strong metal-support interaction for industrial hydrogen evolution

Nature Communications, Год журнала: 2021, Номер 12(1)

Опубликована: Июнь 29, 2021

Abstract Exploring a simple, fast, solvent-free synthetic method for large-scale preparation of cheap, highly active electrocatalysts industrial hydrogen evolution reaction is one the most promising work today. In this work, fast and microwave pyrolysis used to synthesize ultra-small (3.5 nm) Ru-Mo 2 C@CNT catalyst with heterogeneous structure strong metal-support interaction in step. The only exhibits an overpotential 15 mV at current density 10 mA cm −2 , large turnover frequency value up 21.9 s −1 under 100 1.0 M KOH. addition, can reach high densities 500 1000 low overpotentials 56 78 respectively, it displays stability h. This provides feasible way reasonable design other production catalysts.

Язык: Английский

---

Designing a Built-In Electric Field for Efficient Energy Electrocatalysis

ACS Nano, Год журнала: 2022, Номер 16(12), С. 19959 - 19979

Опубликована: Дек. 15, 2022

To utilize intermittent renewable energy as well achieve the goals of peak carbon dioxide emissions and neutrality, various electrocatalytic devices have been developed. However, reactions, e.g., hydrogen evolution reaction/oxygen reaction in overall water splitting, polysulfide conversion lithium–sulfur batteries, formation/decomposition lithium peroxide lithium–oxygen nitrate reduction to degrade sewage, suffer from sluggish kinetics caused by multielectron transfer processes. Owing merits accelerated charge transport, optimized adsorption/desorption intermediates, raised conductivity, regulation microenvironment, ease combine with geometric characteristics, built-in electric field (BIEF) is expected overcome above problems. Here, we give a Review about very recent progress BIEF for efficient electrocatalysis. First, construction strategies characterization methods (qualitative quantitative analysis) are summarized. Then, up-to-date overviews engineering electrocatalysis, attention on electron structure optimization microenvironment modulation, analyzed discussed detail. In end, challenges perspectives proposed. This gives deep understanding design electrocatalysts next-generation storage devices.

Язык: Английский

---