Flexible tungsten disulfide superstructure engineering for efficient alkaline hydrogen evolution in anion exchange membrane water electrolysers

Nature Communications, Journal Year: 2024, Volume and Issue: 15(1)

Published: July 8, 2024

Abstract Anion exchange membrane (AEM) water electrolysis employing non-precious metal electrocatalysts is a promising strategy for achieving sustainable hydrogen production. However, it still suffers from many challenges, including sluggish alkaline evolution reaction (HER) kinetics, insufficient activity and limited lifetime of ampere-level-current-density HER. Here, we report an efficient HER at industrial-level current density wherein flexible WS 2 superstructure designed to serve as the cathode catalyst AEM electrolysis. The features bond-free van der Waals interaction among low Young’s modulus nanosheets ensure excellent mechanical flexibility, well stepped edge defect structure realize high catalytic favorable interface micro-environment. unique can effectively withstand impact high-density gas-liquid exchanges facilitate mass transfer, endowing long-term durability under industrial-scale density. An electrolyser containing this exhibits cell voltage 1.70 V deliver constant 1 A cm −2 over 1000 h with negligible decay rate 9.67 μV −1 .

Language: Английский

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Crystal‐Phase Engineering of Iridium‐Embedded Tungsten for Hydrogen Oxidation Electrocatalysis

Advanced Functional Materials, Journal Year: 2025, Volume and Issue: unknown

Published: Jan. 9, 2025

Abstract Understanding the phase structure‐dependent catalytic performance is of great significance for investigation advanced electrocatalysts. At present, research in engineering metal materials electrocatalysis predominantly concentrates on iron group, platinum and coinage group metals with A1‐, A2‐, A3‐ type structures. However, beyond above other types structures still poorly explored. Herein, using tungsten as a substrate to support iridium, it shown that iridium‐embedded diverse crystal structure (referred Ir/α‐W A2‐type Ir/β‐W A‐15 structure) exhibits distinct activity hydrogen oxidation reactions (HOR) alkaline medium. Notably, mass‐normalized exchange current density (j 0, m ) noble iridium (518.3 A g −1 Ir ≈1.8 times 16.4 higher than Ir/C, respectively. In‐depth mechanistic studies suggest enhanced HOR attributed connectivity H‐bond network well synergistic optimization adsorption binding energies H OH intermediate species. This study can inspire more scientific interest exploration electrocatalysis.

Language: Английский

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Surface S-Doped Nanostructured RuO₂ and Its Anion Passivating Effect for Efficient Overall Seawater Splitting

ACS Nano, Journal Year: 2025, Volume and Issue: unknown

Published: Jan. 9, 2025

Electrolysis of seawater for hydrogen (H2) production to harvest clean energy is an appealing approach. In this context, there urgent need catalysts with high activity and durability. RuO2 electrocatalysts have shown efficient in the oxygen evolution reactions (HER OER), but they still suffer from poor stability. Herein, surface S-doped nanostructured (S-RuO2) rationally fabricated overall splitting. Doping S enhances (overpotentials 25 mV HER 243 long-term durability (1000 h at 100 mA cm–2), achieves nearly 100% Faraday efficiency (FE). Moreover, S-RuO2-based anion exchange membrane electrolyzer requires 2.01 V reach 1.0 A cm–2 under demanding industrial conditions. Experimental analysis theoretical calculations indicate that introduction could lower valence state Ru, thereby conferring enhanced Furthermore, S-RuO2 electrocatalyst highly protected by surface, which repels Cl– alkaline seawater. This investigation presents a feasible strategy designing RuO2-based splitting both performance good resistance anodic corrosion.

Language: Английский

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Design of RuO_x Electrocatalysts Containing Metallic Ru on the Surface to Accelerate the Alkaline Hydrogen Evolution Reaction

ACS Applied Materials & Interfaces, Journal Year: 2025, Volume and Issue: unknown

Published: Jan. 27, 2025

The development of water splitting technology in alkaline medium requires the exploration electrocatalysts superior to Pt/C boost hydrogen evolution reaction (HER). Ruthenium oxides with strong dissociation ability are promising candidates; however, lack combination sites immensely limits their performance. Herein, we reported a unique RuOx catalyst metallic Ru on its surface through simple cation exchange method. We demonstrated that formation greatly enhances interaction between and adsorbed (*H), resulting extremely high HER activity media. Moreover, proposed potential zero charge (Epzc) as descriptor ruthenium-base catalysts for first time revealed existence optimizes Epzc toward region. As result, designed achieves an overpotential only 18 mV at current density 10 mA cm–2. Furthermore, 1.80 V reach 800 cm–2 anion membrane electrolyzer, outperforming benchmark Pt/C.

Language: Английский

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Proton Relay in Hydrogen-Bond Networks Promotes Alkaline Hydrogen Evolution Electrocatalysis

ACS Nano, Journal Year: 2025, Volume and Issue: unknown

Published: Feb. 14, 2025

Common O-/H-down orientation of H2O molecules on electrocatalysts brings favorable OH/H delivery; however, adverse H/OH delivery in their dissociation process hampers the kinetics alkaline hydrogen evolution reaction (HER). To overcome this challenge, we raised a synergetic concept metal-supported involving efficient OH from O-down to metal, timely proton relay metal H-down support through hydrogen-bond network, and prompt H support. After theoretically profiling that high work function difference between (ΔΦ) induces strong electric field at metal–support interface increases connectivity promote relay, practiced over cobalt phosphide-supported ruthenium (Ru/CoP) catalysts with ΔΦ = 0.4 eV, achieving record-high Ru utilization HER activity 66.1 A mgRu–1 −0.1 V vs RHE. The insights into mechanism provide opportunity for design bicomponent electrocatalysts.

Language: Английский

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Switching alkaline hydrogen oxidation reaction pathway via microenvironment modulation of Ru catalysts

Journal of Colloid and Interface Science, Journal Year: 2025, Volume and Issue: 689, P. 137215 - 137215

Published: March 3, 2025

Language: Английский

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Hydroxyl‐Binding Induced Hydrogen Bond Network Connectivity on Ru‐based Catalysts for Efficient Alkaline Hydrogen Oxidation Electrocatalysis

Angewandte Chemie International Edition, Journal Year: 2024, Volume and Issue: unknown

Published: Oct. 25, 2024

Abstract Understanding the role of adsorbed intermediates at polarized catalyst‐electrolyte interface on structure electrical double layer (EDL) is essential for developing highly efficient electrocatalysts. Here, we prepared a series unconventional face‐centered‐cubic ( fcc ) phase Ru‐based catalysts (i.e. ‐Ru, ‐RuCr, and ‐RuCrW) by rational tuning binding energetics hydroxyl intermediate to engineer electrochemical boost performance alkaline hydrogen oxidation reaction (HOR). The introduction oxyphilic metals Cr W can regulate orbital occupation Ru, promote adsorption species, resulting in an anomalous behavior that HOR under media exceeds acidic media. Experimental results theoretical calculations unravel modulated species electrode surface are responsible reconstruction interfacial water dynamic evolution free molecules from nearest above gap region EDL, thereby leading significantly increased connectivity bond network. Our work reveals new understanding controlling process bonding network electrocatalysis, will guide design advanced electrocatalysts through engineering.

Language: Английский

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Efficient Nitrate Reduction Electrocatalyst Was Designed by Identifying and Optimizing the Active Site of Fe3o4

Published: Jan. 1, 2025

Language: Английский

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Atomically Modulating Metal‐Support Interactions by Isolated Co‐N₄ Sites for Efficient Hydrogen Oxidation Catalysis

Advanced Functional Materials, Journal Year: 2025, Volume and Issue: unknown

Published: Feb. 24, 2025

Abstract Supported metal electrocatalysts with appropriate metal‐support interactions (MSIs) show great potential for heterogeneous catalysis, however, precisely tuning the at an atomic level remains a significant challenge. In this work, single‐atom Co‐N 4 sites are introduced to tailor interfaces between PtIr alloy clusters and carbonaceous substrates, thereby establishing highly active stable catalysts toward hydrogen oxidation reaction (HOR) in alkaline electrolytes realizing atomically MSIs modulation. The experimental theoretical results unveil that formation of robust incorporation Co single atoms is evidenced by increased coordination number Pt‐N/C, which effectively optimizes adsorption behaviors H ad on Pt/Ir also tightly immobilizes supports. isolated greatly reduces energy barrier rate‐determining Volmer step, accelerating HOR kinetics electrolytes. Consequently, optimal PtIr‐Co 0.05 NC exhibit exceptional activity exchange current density up 13.1 mA cm −2 28.8 50 mV 0.1 m KOH. Furthermore, electrocatalyst delivers negligible degradation due confinement effect Co‐functionalized carbon supports clusters.

Language: Английский

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Pilot‐Scale Photoreforming of Hydrolyzed Polylactic Acid Waste to High‐Value Chemicals and H₂ via Atomic Ru Integration

Advanced Energy Materials, Journal Year: 2025, Volume and Issue: unknown

Published: March 24, 2025

Abstract Photoreforming of polylactic acid (PLA) waste into valuable chemicals offers a promising approach for environmental protection and valorization, yet faces challenges low yields harsh conditions. Herein, Cd 0.5 Zn S nanotwin catalyst decorated with Ru single atoms clusters is reported, enabling selective photoreforming PLA pyruvic (PA) H 2 . It demonstrated that favor PA formation via hydroxyl dissociation, while the further incorporation serve as active sites production. This synergistic effect significantly enhances photocatalytic performance, achieving 96.8% selectivity efficient production record‐breaking apparent quantum efficiency 83.7% at 400 nm. scalable outdoor processes, utilizing direct 1 m sunlight irradiation to deliver ≈1191 mL h −1 47.27 mmol from waste, paving viable pathway large‐scale simultaneous high‐value

Language: Английский

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