Metal oxide-based materials as an emerging family of hydrogen evolution electrocatalysts

Energy & Environmental Science, Journal Year: 2020, Volume and Issue: 13(10), P. 3361 - 3392

Published: Jan. 1, 2020

Metal oxide-based materials are emerging as a promising family of hydrogen evolution reaction (HER) electrocatalysts.

Language: Английский

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Ni2P/NiMoP heterostructure as a bifunctional electrocatalyst for energy-saving hydrogen production

eScience, Journal Year: 2021, Volume and Issue: 1(1), P. 69 - 74

Published: Sept. 21, 2021

Electrochemical water splitting is a sustainable and feasible strategy for hydrogen production but hampered by the sluggish anodic oxygen evolution reaction (OER). Herein, an effective approach introduced to significantly decrease cell voltage replacing OER with urea oxidation (UOR). A Ni2P/NiMoP nanosheet catalyst hierarchical architecture uniformly grown on nickel foam (NF) substrate through simple hydrothermal phosphorization method. The achieves impressive HER activity, low overpotential of only 22 mV at 10 mA cm–2 Tafel slope 34.5 dec–1. In addition, reduced from 1.49 V 1.33 after introduction 0.33 M urea. Notably, two-electrode electrolyzer employing as bifunctional exhibits current density 1.35 excellent long-term durability 80 h.

Language: Английский

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Perfecting electrocatalystsviaimperfections: towards the large-scale deployment of water electrolysis technology

Energy & Environmental Science, Journal Year: 2021, Volume and Issue: 14(4), P. 1722 - 1770

Published: Jan. 1, 2021

A tuned electronic structure favors the electrocatalytic water splitting reactionviaaccelerating reaction kinetics, changing rate-determining step, and optimizing adsorption energy for intermediates; this is achievedviaintentionally incorporating imperfections into crystal lattices of electrocatalysts.

Language: Английский

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Regulating electronic states of nitride/hydroxide to accelerate kinetics for oxygen evolution at large current density

Nature Communications, Journal Year: 2023, Volume and Issue: 14(1)

Published: April 4, 2023

Rational design efficient transition metal-based electrocatalysts for oxygen evolution reaction (OER) is critical water splitting. However, industrial water-alkali electrolysis requires large current densities at low overpotentials, always limited by intrinsic activity. Herein, we report hierarchical bimetal nitride/hydroxide (NiMoN/NiFe LDH) array as model catalyst, regulating the electronic states and tracking relationship of structure-activity. As-activated NiMoN/NiFe LDH exhibits industrially required density 1000 mA cm-2 overpotential 266 mV with 250 h stability OER. Especially, in-situ electrochemical spectroscopic reveals that heterointerface facilitates dynamic structure to optimize structure. Operando impedance spectroscopy implies accelerated OER kinetics intermediate due fast charge transport. The mechanism revealed combination theoretical experimental studies, indicating as-activated follows lattice oxidation kinetics. This work paves an avenue develop catalysts via tuning states.

Language: Английский

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Advances in noble metal (Ru, Rh, and Ir) doping for boosting water splitting electrocatalysis

Journal of Materials Chemistry A, Journal Year: 2021, Volume and Issue: 9(23), P. 13459 - 13470

Published: Jan. 1, 2021

Electrochemical water splitting is promising for producing high-density and green hydrogen, however, the sluggish H₂O dissociation process, due to low adsorption on catalyst surface, greatly hinders industrial electrochemical a large scale.

Language: Английский

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Recent progress on transition metal oxides as advanced materials for energy conversion and storage

Energy storage materials, Journal Year: 2021, Volume and Issue: 42, P. 317 - 369

Published: July 22, 2021

Language: Английский

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Halogen‐Doped Carbon Dots on Amorphous Cobalt Phosphide as Robust Electrocatalysts for Overall Water Splitting

Advanced Energy Materials, Journal Year: 2022, Volume and Issue: 12(14)

Published: Jan. 24, 2022

Abstract Designing a stable and efficient dual‐functional catalyst for the hydrogen evolution oxygen reactions (HER/OER) is of great significance to development production by water splitting. This work reports on novel halogen (X = F, Cl, Br)‐doped carbon dots modifying amorphous cobalt phosphide (X‐CDs/CoP), which can be tuned choice X‐CDs have urchin, Pinus bungeana , Albizia julibrissin type structures. The different characteristics various led formation mechanisms final As bifunctional catalyst, urchin‐shaped F‐CDs/CoP crystals achieve superior electrocatalytic performance, exhibiting excellent HER/OER activity sustained stability in an alkaline solution. For overall splitting, they provide current density 10 mA cm −2 require low cell voltage 1.48 V 1 M KOH. In addition, catalytic performance shows negligible degradation after 100 h, thus demonstrating long‐term cycling stability. Density functional theory calculations show that improved catalysts due coupling interface between CoP F‐CDs, optimizes hydrogen/oxygen adsorption energy accelerates splitting kinetics. provides guidance rational design transition metal electrocatalysts with outstanding performance.

Language: Английский

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Exclusive Strain Effect Boosts Overall Water Splitting in PdCu/Ir Core/Shell Nanocrystals

Angewandte Chemie International Edition, Journal Year: 2021, Volume and Issue: 60(15), P. 8243 - 8250

Published: Jan. 15, 2021

Abstract Core/shell nanocatalysts are a class of promising materials, which achieve the enhanced catalytic activities through synergy between ligand effect and strain effect. However, it has been challenging to disentangle contributions from two effects, hinders rational design superior core/shell nanocatalysts. Herein, we report precise synthesis PdCu/Ir nanocrystals, can significantly boost oxygen evolution reaction (OER) via exclusive The heteroepitaxial coating four Ir atomic layers onto PdCu nanoparticle gives relatively thick shell eliminating effect, but creates compressive ca. 3.60%. strained catalysts deliver low OER overpotential high mass activity. Density functional theory (DFT) calculations reveal that in downshifts d‐band center weakens binding intermediates, causing also boosts hydrogen (HER) activity nanocrystals be served as excellent for both anode cathode overall water‐splitting electrocatalysis.

Language: Английский

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Ultralow Ru Incorporated Amorphous Cobalt‐Based Oxides for High‐Current‐Density Overall Water Splitting in Alkaline and Seawater Media

Small, Journal Year: 2021, Volume and Issue: 17(39)

Published: Aug. 12, 2021

Abstract Realizing efficiency and stable hydrogen production by water electrolysis under high current densities is essential to the forthcoming economy. However, its industrial breakthrough seriously limited bifunctional catalysts with slow evolution reaction (HER) oxygen (OER) electrocatalytic processes. Herein, an ultralow Ru incorporated amorphous cobalt‐based oxide (Ru‐CoO x /NF), effectively driving of at in alkaline seawater, designed constructed. In 1 m KOH, reach density 1000 mA cm −2 for HER OER, it only needs 252 370 mV overpotentials, respectively, beyond commercial Pt/C RuO 2 catalysts. At density, also presents outstanding electrochemical stability. Then electrolyzer apparatus assembled Ru‐CoO /NF, just requires ultra‐low voltage 2.2 2.62 V support seawater electrolysis, production, better than that This work demonstrates /NF one most promising applications provides a possibility exploration high‐current‐density electrocatalysis changing crystallinity catalyst.

Language: Английский

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Ultralow Ru doping induced interface engineering in MOF derived ruthenium-cobalt oxide hollow nanobox for efficient water oxidation electrocatalysis

Chemical Engineering Journal, Journal Year: 2021, Volume and Issue: 420, P. 129805 - 129805

Published: April 19, 2021

Language: Английский

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