Insight into Structural Evolution, Active Sites, and Stability of Heterogeneous Electrocatalysts

Angewandte Chemie International Edition, Год журнала: 2021, Номер 61(11)

Опубликована: Сен. 7, 2021

Studying structure-activity correlations of electrocatalysts is essential for improving the conversion electrical to chemical energy. Recently, increasing evidence obtained by operando characterization techniques reveal that structural evolution catalysts caused interplay with electric fields, electrolytes and reactants/intermediates brings about formation real active sites. Hence, it time summarize related research advances envisage future developments. In this Minireview, we first introduce fundamental concepts associated (e.g., catalysts, sites/centers stability/lifetime) their relevance. Then, multiple triggers advanced characterizations are discussed. Significantly, a brief overview its reversibility in heterogeneous electrocatalysis provided, especially representative electrocatalytic oxygen reaction (OER) CO2 reduction (CO2 RR) processes. Lastly, key challenges opportunities exciting field highlighted.

Язык: Английский

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Synergistic effect of multiple vacancies to induce lattice oxygen redox in NiFe-layered double hydroxide OER catalysts

Applied Catalysis B Environment and Energy, Год журнала: 2022, Номер 323, С. 122091 - 122091

Опубликована: Ноя. 3, 2022

Язык: Английский

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Surface Activation and Ni‐S Stabilization in NiO/NiS₂for Efficient Oxygen Evolution Reaction

Angewandte Chemie International Edition, Год журнала: 2022, Номер 61(35)

Опубликована: Июнь 22, 2022

Manipulating the active species and improving structural stabilization of sulfur-containing catalysts during OER process remain a tremendous challenge. Herein, we constructed NiO/NiS2 Fe-NiO/NiS2 as catalyst models to study effect Fe doping. As expected, exhibits low overpotential 270 mV at 10 mA cm-2 . The accumulation hydroxyl groups on surface materials after doping can promote formation highly NiOOH lower potential. Moreover, investigated level corrosion M-S bonds compared stability variation with different locations. Interestingly, bonded S in bulk sacrificial agent alleviate oxidation partial Ni-S thus endow long-term durability. This work could motivate community focus more resolving materials.

Язык: Английский

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Activating Lattice Oxygen in Layered Lithium Oxides through Cation Vacancies for Enhanced Urea Electrolysis

Angewandte Chemie International Edition, Год журнала: 2022, Номер 61(31)

Опубликована: Май 18, 2022

Despite the fact that high-valent nickel-based oxides exhibit promising catalytic activity for urea oxidation reaction (UOR), fundamental questions concerning origin of high performance and structure-activity correlations remain to be elucidated. Here, we unveil underlying enhanced mechanism UOR by employing a series prepared cation-vacancy controllable LiNiO2 (LNO) model catalysts. Impressively, optimized layered LNO-2 exhibits an extremely low overpotential at 10 mA cm-2 along with excellent stability after 160 h test. Operando characterisations combined theoretical analysis reveal activated lattice oxygen in moderate cation vacancies triggers charge disproportion Ni site form Ni4+ species, facilitating deprotonation involved process.

Язык: Английский

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Chemical etching induced microporous nickel backbones decorated with metallic Fe@hydroxide nanocatalysts: an efficient and sustainable OER anode toward industrial alkaline water-splitting

Journal of Materials Chemistry A, Год журнала: 2022, Номер 10(16), С. 8989 - 9000

Опубликована: Янв. 1, 2022

An efficient and sustainable gas diffusible OER anode toward industrial alkaline water-splitting is fabricated by simply immersing Ni foam in ethanolic FeCl 3 etchant, which produces a microporous backbone decorated with nanocatalysts.

Язык: Английский

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In situprecise anchoring of Pt single atoms in spinel Mn₃O₄for a highly efficient hydrogen evolution reaction

Energy & Environmental Science, Год журнала: 2022, Номер 15(11), С. 4592 - 4600

Опубликована: Янв. 1, 2022

Controllable doping of a Pt single-atom into the octahedral sites spinel Mn 3 O 4 lattice leads to moderate rise d-band-center, which guarantees adsorption key intermediates for superior hydrogen evolution reaction.

Язык: Английский

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Dynamic dissolution and re-adsorption of molybdate ion in iron incorporated nickel-molybdenum oxyhydroxide for promoting oxygen evolution reaction

Applied Catalysis B Environment and Energy, Год журнала: 2022, Номер 307, С. 121150 - 121150

Опубликована: Янв. 29, 2022

Язык: Английский

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A review of modulation strategies for improving catalytic performance of transition metal phosphides for oxygen evolution reaction

Applied Catalysis B Environment and Energy, Год журнала: 2022, Номер 325, С. 122313 - 122313

Опубликована: Дек. 21, 2022

Язык: Английский

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Vanadium‐Incorporated CoP₂ with Lattice Expansion for Highly Efficient Acidic Overall Water Splitting

Angewandte Chemie International Edition, Год журнала: 2022, Номер 61(12)

Опубликована: Янв. 5, 2022

A proton exchange membrane water electrolyzer (PEMWE) in acidic medium is a hopeful scenario for hydrogen production using renewable energy, but the grand challenge lies substituting noble-metal catalysts. Herein, robust electrocatalyst of V-CoP2 porous nanowires arranged on carbon cloth successfully fabricated by incorporating vanadium into CoP2 lattice. Structural characterizations and theoretical analysis indicate that lattice expansion caused V incorporation results upshift d-band center, which conducive to adsorption boosting evolution reaction (HER). Besides, promotes surface reconstruction generate thicker Co3 O4 layer with an oxygen vacancy enhances acid-corrosion resistance optimizes oxygen-containing species, thus improving activity stability toward (OER). Accordingly, it presents superior overall splitting (1.47 V@10 mA cm-2 ) Pt-C/CC||RuO2 /CC (1.59 ), remarkable stability. This work proposes new route design efficient non-noble metal electrocatalysts PEMWE.

Язык: Английский

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Etching-Induced Surface Reconstruction of NiMoO4 for Oxygen Evolution Reaction

Nano-Micro Letters, Год журнала: 2023, Номер 15(1)

Опубликована: Янв. 9, 2023

Rational reconstruction of oxygen evolution reaction (OER) pre-catalysts and performance index OER catalysts are crucial but still challenging for universal water electrolysis. Herein, we develop a double-cation etching strategy to tailor the electronic structure NiMoO4, where prepared NiMoO4 nanorods etched by H2O2 reconstruct their surface with abundant cation deficiencies lattice distortion. Calculation results reveal that double can make upshift d-band center Ni atoms active sites better adsorption capacity. As result, optimized sample (NMO-30M) possesses an overpotential 260 mV at 10 mA cm-2 excellent long-term durability 162 h. Importantly, in situ Raman test reveals rapid formation high-oxidation-state transition metal hydroxide species, which further help improve catalytic activity OER. This work highlights influence remodification shed some light on activating catalysts.

Язык: Английский

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