High-entropy single-atom activated carbon catalysts for sustainable oxygen electrocatalysis

Nature Sustainability, Год журнала: 2023, Номер 6(7), С. 816 - 826

Опубликована: Март 30, 2023

Язык: Английский

---

Construction of Zn-doped RuO2 nanowires for efficient and stable water oxidation in acidic media

Nature Communications, Год журнала: 2023, Номер 14(1)

Опубликована: Май 2, 2023

Abstract Oxygen evolution reaction catalysts capable of working efficiently in acidic media are highly demanded for the commercialization proton exchange membrane water electrolysis. Herein, we report a Zn-doped RuO 2 nanowire array electrocatalyst with outstanding catalytic performance oxygen under conditions. Overpotentials as low 173, 304, and 373 mV achieved at 10, 500, 1000 mA cm −2 , respectively, robust stability reaching to h 10 . Experimental theoretical investigations establish clear synergistic effect Zn dopants vacancies on regulating binding configurations oxygenated adsorbates active centers, which then enables an alternative Ru−Zn dual-site oxide path reaction. Due change pathways, energy barrier rate-determining step is reduced, over-oxidation Ru sites alleviated. As result, activity significantly enhanced.

Язык: Английский

---

Sustainable zinc–air battery chemistry: advances, challenges and prospects

Chemical Society Reviews, Год журнала: 2023, Номер 52(17), С. 6139 - 6190

Опубликована: Янв. 1, 2023

Sustainable zinc-air batteries (ZABs) are considered promising energy storage devices owing to their inherent safety, high density, wide operating temperature window, environmental friendliness, etc., showing great prospect for future large-scale applications. Thus, tremendous efforts have been devoted addressing the critical challenges associated with sustainable ZABs, aiming significantly improve efficiency and prolong operation lifespan. The growing interest in ZABs requires in-depth research on oxygen electrocatalysts, electrolytes, Zn anodes, which not systematically reviewed date. In this review, fundamentals of electrocatalysts air cathodes, physicochemical properties ZAB issues strategies stabilization anodes summarized from perspective fundamental characteristics design principles. Meanwhile, significant advances situ/operando characterization highlighted provide insights into reaction mechanism dynamic evolution electrolyte|electrode interface. Finally, several thoughts perspectives provided regarding opportunities ZABs. Therefore, review provides a thorough understanding advanced chemistry, hoping that timely comprehensive can shed light upcoming horizons prosperous area.

Язык: 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, Год журнала: 2023, Номер 13(4), С. 2313 - 2325

Опубликована: Янв. 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

Язык: Английский

---

Humidity-sensitive chemoelectric flexible sensors based on metal-air redox reaction for health management

Nature Communications, Год журнала: 2022, Номер 13(1)

Опубликована: Сен. 15, 2022

Numerous studies have shown flexible electronics play important roles in health management. The way of power supply is always an essential factor devices and self-powered ones are very attractive because the fabrication easiness, usage comfort aesthetics system. In this work, based on metal-air redox reaction, which usually used designing batteries, we design a chemoelectric humidity sensor where silk fibroin (SF) LiBr gel matrix containing parallel aligned graphene oxide (GO) flakes serve as electrolyte. abundant hydrophilic groups GO/SF hygroscopicity lead to tight dependence output current humidity, enabling high sensitivity (0.09 μA/s/1%), fast response (1.05 s) quick recovery (0.80 s). As proofs concept, all-in-one respiratory monitoring-diagnosing-treatment system non-contact human-machine interface, demonstrating applications

Язык: Английский

---

Tailoring Oxygen Reduction Reaction Kinetics on Perovskite Oxides via Oxygen Vacancies for Low‐Temperature and Knittable Zinc–Air Batteries

Advanced Materials, Год журнала: 2023, Номер 35(36)

Опубликована: Май 29, 2023

High kinetics oxygen reduction reaction (ORR) electrocatalysts under low temperature are critical and highly desired for temperature-tolerant energy conversion storage devices, but remain insufficiently investigated. Herein, vacancy-rich porous perovskite oxide (CaMnO3 ) nanofibers coated with reduced graphene coating (V-CMO/rGO) developed as the air electrode catalyst low-temperature knittable Zn-air batteries. V-CMO/rGO exhibits top-level ORR activity among oxides shows impressive temperature. Experimental theoretical calculation results reveal that synergistic effect between metal atoms vacancies, well accelerated enhanced electric conductivity mass transfer over rGO nanofiber 3D network contribute to catalytic activity. The desorption of intermediate is promoted by regulated electron filling. drives flexible batteries a -40 °C high peak power density 56 mW cm-2 long cycle life 80 h. This study provides insight kinetically active facilitates ZABs application in harsh environment.

Язык: Английский

---

Recent Advances in Engineered Ru‐Based Electrocatalysts for the Hydrogen/Oxygen Conversion Reactions

Advanced Energy Materials, Год журнала: 2022, Номер 12(41)

Опубликована: Сен. 1, 2022

Abstract The application of renewable energy conversion devices is considered as one the effective ways to alleviate shortage and environmental pollution. Designing electrocatalysts with excellent performance affordable price promising accelerate reaction process large‐scale application. At present, ruthenium (Ru)‐based nanomaterials have shown similar catalytic activity but superior demand compared commercial Pt/C. This undoubtedly makes Ru‐based a perfect candidate replace advanced Pt catalysts. Significant progress made in rational design electrocatalysts, an in‐depth understanding engineering strategies induced effects still at early stage. review summarizes modification for enhancing Ru, including surface structure, metal element, nonmetal size, bimetallic oxides, heterostructure strategies. Then electronic modulation generated by intramolecular intermolecular are elucidated. Further, engineered hydrogen oxygen reactions highlighted, correlations strategies, activity, pathways elaborated. Finally, challenges prospects presented future development practical nanomaterials.

Язык: Английский

---

Bifunctional Single Atom Catalysts for Rechargeable Zinc–Air Batteries: From Dynamic Mechanism to Rational Design

Advanced Materials, Год журнала: 2023, Номер 35(35)

Опубликована: Июнь 7, 2023

Ever-growing demands for rechargeable zinc-air batteries (ZABs) call efficient bifunctional electrocatalysts. Among various electrocatalysts, single atom catalysts (SACs) have received increasing attention due to the merits of high utilization, structural tunability, and remarkable activity. Rational design SACs relies heavily on an in-depth understanding reaction mechanisms, especially dynamic evolution under electrochemical conditions. This requires a systematic study in mechanisms replace current trial error modes. Herein, fundamental oxygen reduction is first presented combining situ and/or operando characterizations theoretical calculations. By highlighting structure-performance relationships, rational regulation strategies are particularly proposed facilitate SACs. Furthermore, future perspectives challenges discussed. review provides thorough SACs, which expected pave avenue exploring optimum effective ZABs.

Язык: Английский

---

Zn-based batteries for sustainable energy storage: strategies and mechanisms

Chemical Society Reviews, Год журнала: 2024, Номер 53(10), С. 4877 - 4925

Опубликована: Янв. 1, 2024

This review systematically summarizes various redox mechanisms in Zn-based batteries and design strategies to improve their electrochemical performance, which provides a reference for future development of high-performance batteries.

Язык: Английский

---

A Fe Single Atom Seed‐Mediated Strategy Toward Fe₃C/FeNC Catalysts with Outstanding Bifunctional ORR/OER Activities

Advanced Science, Год журнала: 2023, Номер 10(22)

Опубликована: Май 31, 2023

The discovery of low-cost and high-performance bifunctional oxygen electrocatalysts is vital to the future commercialization rechargeable zinc-air batteries (ZABs). Herein, a Fe single atom seed-mediated strategy reported for fabrication Fe3 C species closely surrounded by FeN4 C active sites with strong electronic interactions built between them more importantly, creating optimized coordination environment, via subtly adjusting their ratio, favorable adsorption energies intermediates formed during reduction reaction (ORR) evolution (OER). Concretely, voltage difference (ΔE) ORR half-wave OER potential at current density 10 mA cm-2 compositionally-optimized FeNC/Fe3 C-op electrocatalyst only 0.668 V, endowing itself one best OER/ORR benchmarks. As demo, ZABs assembled as air cathode deliver remarkable specific capacity (818.1 mAh gZn-1 ) power (1013.9 mWh ), along excellent long-term durability (>450 h). This work extends methodology modulate activity atomic site, undoubtedly inspiring wide explorations on precise design electrocatalysts.

Язык: Английский

---