Design of modified MOFs electrocatalysts for water splitting: High current density operation and long-term stability

Applied Catalysis B Environment and Energy, Journal Year: 2023, Volume and Issue: 336, P. 122891 - 122891

Published: May 18, 2023

Language: Английский

---

Regulative electronic redistribution of CoTe2/CoP heterointerfaces for accelerating water splitting

Applied Catalysis B Environment and Energy, Journal Year: 2023, Volume and Issue: 329, P. 122551 - 122551

Published: March 2, 2023

Language: Английский

---

Identifying the roles of Ru single atoms and nanoclusters for energy-efficient hydrogen production assisted by electrocatalytic hydrazine oxidation

Applied Catalysis B Environment and Energy, Journal Year: 2022, Volume and Issue: 323, P. 122145 - 122145

Published: Nov. 11, 2022

Language: Английский

---

Constructing regulable supports via non-stoichiometric engineering to stabilize ruthenium nanoparticles for enhanced pH-universal water splitting

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

Published: March 29, 2024

Abstract Establishing appropriate metal-support interactions is imperative for acquiring efficient and corrosion-resistant catalysts water splitting. Herein, the interaction mechanism between Ru nanoparticles a series of titanium oxides, including TiO, Ti 4 O 7 TiO 2, designed via facile non-stoichiometric engineering systematically studied. 7, with unique band structure, high conductivity chemical stability, endows ingenious through interfacial Ti–O–Ru units, which stabilizes species during OER triggers hydrogen spillover to accelerate HER kinetics. As expected, Ru/Ti displays ultralow overpotentials 8 mV 150 long operation 500 h at 10 mA cm −2 in acidic media, expanded pH-universal environments. Benefitting from excellent bifunctional performance, proton exchange membrane anion electrolyzer assembled achieves superior performance robust operation. The work paves way energy conversion devices.

Language: Английский

---

Hydrogen Radical-Induced Electrocatalytic N₂ Reduction at a Low Potential

Journal of the American Chemical Society, Journal Year: 2023, Volume and Issue: 145(18), P. 10259 - 10267

Published: April 25, 2023

Realizing efficient hydrogenation of N2 molecules in the electrocatalytic nitrogen reduction reaction (NRR) is crucial achieving high activity at a low potential because it theoretically requires higher equilibrium than other steps. Analogous to metal hydride complexes for reduction, this step by chemical can weaken dependence initial process. However, strategy rarely reported NRR, and catalytic mechanism remains ambiguous lacks experimental evidence. Here, we show highly electrocatalyst (ruthenium single atoms anchored on graphdiyne/graphene sandwich structures) with hydrogen radical-transferring mechanism, which graphdiyne (GDY) generates radicals (H•), effectively activate generate NNH (•NNH). A dual-active site constructed suppress competing evolution, where preferentially adsorbs GDY Ru serve as adsorption •NNH promote further NH3 synthesis. As result, selectivity are obtained simultaneously -0.1 V versus reversible electrode. Our findings illustrate novel transfer that greatly reduce maintain NRR provide powerful guidelines design concept electrocatalysts.

Language: Английский

---

Optimizing Pt-Based Alloy Electrocatalysts for Improved Hydrogen Evolution Performance in Alkaline Electrolytes: A Comprehensive Review

ACS Nano, Journal Year: 2023, Volume and Issue: 17(21), P. 20804 - 20824

Published: Nov. 3, 2023

The splitting of water through electrocatalysis offers a sustainable method for the production hydrogen. In alkaline electrolytes, lack protons forces dissociation to occur before hydrogen evolution reaction (HER). While pure Pt is gold standard electrocatalyst in acidic since 5d orbital nearly fully occupied, when it overlaps with molecular water, generates Pauli repulsion. As result, formation Pt–H* bond an environment difficult, which slows HER and negates benefits using catalyst. To overcome this limitation, can be alloyed transition metals, such as Fe, Co, Ni. This approach has potential not only enhance performance but also increase dispersion decrease its usage, thus overall improving catalyst's cost-effectiveness. excellent adsorption ability metals contributes generation proton-rich local near Pt-based alloy that promotes HER. Significant progress been achieved comprehending mechanism manipulation structure composition electrocatalysts based on alloy. objective review analyze condense latest developments It focuses modified alloys clarifies design principles catalytic catalysts from both experimental theoretical perspective. highlights some difficulties encountered during opportunities increasing performance. Finally, guidance development more efficient provided.

Language: Английский

---

Parallel Nanosheet Arrays for Industrial Oxygen Production

Journal of the American Chemical Society, Journal Year: 2023, Volume and Issue: 145(46), P. 25143 - 25149

Published: Nov. 9, 2023

According to the traditional nucleation theory, crystals in solution nucleate under thermal fluctuations with random crystal orientation. Thus, nanosheet arrays grown on a substrate always exhibit disordered arrangements, which impede mass transfer during catalysis. To overcome this limitation, here, we demonstrate stress-induced, oriented and growth of arrays. A regularly self-growing parallel array is realized curved substrate. During electrochemical oxygen production, ordered maintains steady flow liquids microchannels, suppressing detrimental production flow-blocking bubbles typical randomly Controllable arrays, fully covered fluffy-like ultrathin nanosheets, amorphous structures altogether enable full-scale design hierarchical interfaces from micro- atomic scale, significantly improving otherwise sluggish kinetics evolution toward industrial ultrafast production. Record-high 135 L·min-1·m-2 high working current 4000 mA·cm-2 steadily achieved at competitively low cell voltage 2.862 V. These results related insights lay basis for further developments beyond classical approaches, benefits large-scale, processes as shown here

Language: Английский

---

Self-supported electrocatalysts for the hydrogen evolution reaction

Materials Chemistry Frontiers, Journal Year: 2022, Volume and Issue: 7(4), P. 567 - 606

Published: Dec. 15, 2022

The high-performance self-supported electrocatalysts for the hydrogen evolution reaction are systematically summarized.

Language: Английский

---

Engineering a local potassium cation concentrated microenvironment toward the ampere-level current density hydrogen evolution reaction

Energy & Environmental Science, Journal Year: 2022, Volume and Issue: 16(1), P. 285 - 294

Published: Dec. 6, 2022

Finding an active and robust non-platinum catalyst toward the alkaline hydrogen evolution reaction (HER) operating at ampere-level current density is important for emerging anion exchange membrane (AEM) water electrolysis but challenging.

Language: Английский

---

Multi‐d Electron Synergy in LaNi_1‐xCo_xRu Intermetallics Boosts Electrocatalytic Hydrogen Evolution

Angewandte Chemie International Edition, Journal Year: 2023, Volume and Issue: 63(1)

Published: Nov. 21, 2023

Despite the fact that d-band center theory links d electron structure of transition metals to their catalytic activity, it is yet unknown how synergistic effect multi-d electrons impacts performance. Herein, novel LaNi1-x Cox Ru intermetallics containing 5d, 4d, and 3d were prepared. In these compounds, 5d orbital La transfers 4d Ru, which provides adsorption sites for H*. The orbitals Ni Co interact with generate an anisotropic distribution, facilitates desorption OH*. ensures efficient activity. optimized LaNi0.5 Co0.5 has overpotential 43mV at 10 mA cm-2 alkaline electrocatalytic hydrogen evolution reaction. Beyond offering a variety new electrocatalysts, this work reveals synergy in promoting

Language: Английский

---