Multiple metallic dopants in nickel nanoparticles for electrocatalytic oxygen evolution

Developing efficient oxygen evolution reaction(OER) electrocatalysts is of great importance for sustainable energy conversion and storage. Ni-based catalysts have shown great potential as OER electrocatalysts, but their performance still needs to be improved. Herein, we report the multiple metal doped nickel nanoparticles synthesized via a simple oil phase strategy as efficient OER catalysts. The FeMnMoV–Ni exhibits superior OER performance with an overpotential of 220 mV at 10 mA cm^-2     

Transition-metal-doped Fe2O3 nanoparticles for oxygen evolution reaction

Hematite(α-Fe_2O_3)has been extensively studied as a promising photocatalyst,with the capacity to split water under visible light.To tune its electronic structure and improve the performance for oxygen evolution reaction(OER),high-quality single crystals ofα-Fe_2O_3nanoparticles were synthesized and doped by various transition metals(M=V,Cr,Mn,Zn,Co,Ni,Cu,Nb,Mo,Ti)by a molten-salt flux method.Optical,electronic and catalytic properties of transition-metal-dopedα-Fe_2O_3(TM-dopedα-Fe_2O_3)have been systematically investigated.Cobalt has been identified as the best dopant forα-Fe_2O_3,reducing the OER overpotential by 0.16 V with respect to the undoped.     

金属有机骨架衍生的NiFe2O4/Co9S8复合催化剂的合成及其电催化析氧性能

以金属有机骨架(metal-organic frameworks, MOFs)化合物为前驱体, 通过退火、硫化等后续处理方法成功制备了由 NiFe₂O₄ 纳米棒与 Co₉S₈ 空心球组装而成的杂化纳米结构. 该复合催化剂因具有较大的比表面积以及各组分间强力的协同作用, 在电催化析氧反应(oxygen evolution reaction, OER)中表现出了优异的催化活性. 在 1 mol/L KOH 电解质中, 当电流密度达到 10 mA/cm² 时, 仅需 290 mV 的过电位, 且 Tafel 斜率仅为 63.02 mV/dec. 此外, 1 000 次循环伏安(cyclic voltammetry, CV)测试后仍然具有良好的催化活性, 表明该复合催化剂具有优异的稳定性. 研究成果不仅为设计廉价、高效且稳定的析氧催化剂提供了设计思路, 也为其他新型纳米复合材料的合成和应用奠定了基础.     

Unveiling the role of Zn dopants in NiFe phosphide nanosheet for oxygen evolution reaction

Transition metal phosphides have been recognized as promising electrocatalysts for oxygen evolution reaction(OER) due to their low cost and high activity. However, the insufficient exposed active region limited the OER performance. Recently, the introduction of sacrificial dopants has been considered an effective strategy to enlarge the surface area. Herein, the Zn dopants are introduced in NiFe phosphide(NiFeZnP) nanosheet, which work as the sacrificial dopants to generate more exposed active N...     

Advances in electrocatalysts for oxygen evolution reaction of water electrolysis-from metal oxides to carbon nanotubes

The water electrolysis for hydrogen production is constrained by the thermodynamically unfavorable oxygen evolution reaction(OER),which requires input of a large amount of energy to drive the reaction.One of the key challenges to increase the efficiency of the water electrolysis system is to develop highly effective and robust electrocatalysts for the OER.In the past 20–30 years,significant progresses have been made in the development of efficient electrocatalysts,including metal oxides,metal oxide-carbon nanotubes(CNTs) hybrid and metal-free CNTs based materials for the OER.In this critical review,the overall progress of metal oxides catalysts and the role of CNTs in the development of OER catalyst are summarized,and the latest development of new metal free CNTs-based OER catalyst is discussed.     

Dual elemental modulation in cationic and anionic sites of the multi-metal Prussian blue analogue pre-catalysts for promoted oxygen evolution reaction

Designing advanced electrocatalysts for the oxygen evolution reaction (OER) is of great significance owing to its crucial role in facilitating the production of clean hydrogen energy via water splitting. To date, it has been widely accepted that a pre-oxidation process with the in-situ generation of the catalytically active high-valence metal sites is essential for promoting the OER behavior of most transition-metal-based OER catalysts, or more felicitously speaking, pre-catalysts. Hence, exploring such pre-catalysts with high pre-oxidation reactivity is of high promise. Herein, we proposed the dual elemental modulation in the cationic and anionic sites of the multi-metal Prussian blue analogue (PBA) pre-catalysts, resulting in promoted OER behavior benefitted from the efficient pre-oxidation ability as well as the multi-metal synergy. Detailed investigations indicate that the Co-containing multi-metallic cations and mixed Fe^IIICo^III cyanide anions in NiCuCo^II–Fe^IIICo^III PBA (denoted as NiCuCo^II–Fe^IIICo^III) are beneficial to OER catalysis owing to the high intrinsic activity guaranteed by the local Co³⁺ active sites as well as the optimal multi-metal synergy. After the facile pre-oxidation process, additional high-valence Ni, Cu and Fe ions can be in-situ formed and serve as the active sites, thereby resulting in significantly improved OER behavior. For example, the OER current density of NiCuCo^II–Fe^IIICo^III exhibits 1.81 times enhancement even after 72 ?h continuous OER catalysis, and the required overpotential for 10 ?mA ?cm^?2 reduces from 288 ?mV for the fresh pre-catalyst to a remarkable record of 251 ?mV after the pre-oxidation-induced activation, making the optimal PBA-based catalyst a promising candidate for efficient and durable water electrolysis.     

Effect of supporting materials on the electrocatalytic activity,stability and selectivity of noble metal-based catalysts for oxygen reduction and hydrogen evolution reactions

Carbonaceous and alternative supporting materials for platinum(Pt) and palladium(Pd) have been explored for the cathodic electrocatalysis in low-temperature fuel cells. Pd and Pt are widely used for catalysis owing to their remarkable electrocatalytic activity toward water splitting and fuel cell reactions. Supporting materials play a paramount role in defining electrocatalytic properties such as durability, selectivity, and activity. The conventional supporting material such as carbon black is unable to fit all the requirements under the severe operating conditions of fuel cells due to its poor corrosion resistance and limited mass transport of fuels to active catalyst sites. Nowadays the scientific research is being concentrated on devising different altered carbonic and carbonfree supporting materials for catalysts to improve the catalytic activity, stability, and selectivity of noble metal electrocatalysts. Lately, Pt, Pd and their alloy catalysts supported on modified carbonaceous and carbon-free materials have attracted solid interest owing to their prominent characteristics contributing to the remarkable fuel cell efficacy. Therefore, it is reasonable to explore this theme, regarding a variety of supporting materials,their advantages, drawbacks and future perspectives. In this mini-review, we selectively summarize recent advancements on several types of key supporting materials: carbon(graphene, carbon nanotubes, mesoporous carbon, and doped carbon nanostructures), non-carbon(transition metals oxides, borides, nitrides, and carbides)and hybrid nanocomposites.