Efficient and stable noble-metal-free catalyst for acidic water oxidation

Nature Communications, Journal Year: 2022, Volume and Issue: 13(1)

Published: April 28, 2022

Developing non-noble catalysts with superior activity and durability for oxygen evolution reaction (OER) in acidic media is paramount hydrogen production from water. Still, challenges remain due to the inadequate stability of OER catalyst. Here, we report a cost-effective stable manganese oxybromide (Mn7.5O10Br3) catalyst exhibiting an excellent electrolytes, overpotential as low 295 ± 5 mV at current density 10 mA cm-2. Mn7.5O10Br3 maintains good under operating conditions least 500 h. In situ Raman spectroscopy, X ray absorption near edge functional theory calculations confirm that self-oxidized surface enhanced electronic transmission capacity forms on responsible both high catalytic long-term during catalysis. The development provides crucial insights into design metal electrocatalysts water oxidation.

Language: Английский

---

On the Durability of Iridium‐Based Electrocatalysts toward the Oxygen Evolution Reaction under Acid Environment

Advanced Functional Materials, Journal Year: 2021, Volume and Issue: 32(5)

Published: Oct. 17, 2021

Abstract Proton exchange membrane water electrolyzers (PEMWEs) driven by renewable electricity provide a facile path toward green hydrogen production, which is critical for establishing sustainable society. The high working potential and the corrosive environment pose severe challenges developing highly active durable electrocatalysts oxygen evolution reaction (OER). To date, iridium (Ir)‐based materials, largely metallic Ir Ir‐based oxides, are most suitable OER PEMWEs due to their balanced activity durability. Tremendous efforts have been devoted improving specific of species reduce cost; however, advances in enhancing durability rather limited. In this review, recent research progress on tackling stability issues acid media summarized, aiming inspiration designing stable electrocatalysts. mechanism associated failure modes summarized. Then, mechanistic studies dissolution behavior experimental attempts discussed. personal perspectives future also provided.

Language: Английский

---

MnO₂ Electrocatalysts Coordinating Alcohol Oxidation for Ultra‐Durable Hydrogen and Chemical Productions in Acidic Solutions

Angewandte Chemie International Edition, Journal Year: 2021, Volume and Issue: 60(39), P. 21464 - 21472

Published: July 29, 2021

Abstract Electrocatalytic hydrogen production under acidic conditions is of great importance for industrialization in comparison to that alkaline media, which, unfortunately, still remains challenging due the lack earth‐abundant, cost‐effective and highly active anodic electrocatalysts can be used durably strongly conditions. Here we report an unexpected finding manganese oxide, a kind common non‐noble catalysts easily soluble solutions, applied as efficient extremely durable electrocatalyst from aqueous solution alcohols. Particularly glycerol solution, potential low 1.36 V (vs. RHE) needed at 10 mA cm −2 , which 270 mV lower than oxygen evolution reaction (OER), oxidize into value‐added chemicals such formic acid, without production. To our surprise, oxide exhibits high stability electrocatalytic coupling with oxidation longer 865 hours compared shorter h OER. Moreover, effect addition on electrochemical durability has been probed via situ Raman spectroscopic analysis density functional theory (DFT) calculations. This work demonstrates acid‐unstable metal robustly media presence certain substances purposes,

Language: Английский

---

Atomically dispersed Ru oxide catalyst with lattice oxygen participation for efficient acidic water oxidation

Chem, Journal Year: 2023, Volume and Issue: 9(7), P. 1882 - 1896

Published: April 6, 2023

Language: Английский

---

Facet Engineering of Advanced Electrocatalysts Toward Hydrogen/Oxygen Evolution Reactions

Nano-Micro Letters, Journal Year: 2023, Volume and Issue: 15(1)

Published: Feb. 16, 2023

The electrocatalytic water splitting technology can generate high-purity hydrogen without emitting carbon dioxide, which is in favor of relieving environmental pollution and energy crisis achieving neutrality. Electrocatalysts effectively reduce the reaction barrier increase efficiency. Facet engineering considered as a promising strategy controlling ratio desired crystal planes on surface. Owing to anisotropy, with different orientations usually feature facet-dependent physical chemical properties, leading differences adsorption energies oxygen or intermediates, thus exhibit varied activity toward evolution (HER) (OER). In this review, brief introduction basic concepts, fundamental understanding mechanisms well key evaluating parameters for both HER OER are provided. formation facets comprehensively overviewed aiming give scientific theory guides realize dominant planes. Subsequently, three strategies selective capping agent, etching coordination modulation tune summarized. Then, we present an overview significant contributions facet-engineered catalysts HER, OER, overall splitting. particular, highlight that density functional calculations play indispensable role unveiling structure–activity correlation between plane catalytic activity. Finally, remaining challenges provided future prospects designing advanced electrocatalysts discussed.

Language: Английский

---