High-entropy alloy stabilized active Ir for highly efficient acidic oxygen evolution

Zhu, Han; Zhu, Zhiliang; Hao, Jiace; Sun, Shuhui; Lu, Shuanglong; Wang, Chan; Ma, Piming; Dong, Weifu

doi:10.1016/j.cej.2021.133251

Cited by 125 publications

(81 citation statements)

References 48 publications

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“…Under OCP conditions, there are no obvious signals, while at the applied potential of 1.12 V, two observed peaks were found at 452 cm –1 [ v (Ni II –OH)) and 517 cm –1 ( v (Ni II –OH)], which can be attributed to the A 1g stretching modes of Ni(OH) 2 . With further increase to 1.22–1.52 V, the peaks for Ni(OH) 2 faded away and two new peaks [located at 473 cm –1 ( v (Ni III –O)) and 562 cm –1 ( v (Ni III –O))] appeared, which can be assigned to the e g bending vibration and the A 1g stretching vibration modes of NiOOH, respectively. , The above results suggest the occurrence of surface reconstruction on the CoNiCuMnMo-NPs catalyst during the GOR process.…”

Section: Results and Discussionmentioning

confidence: 97%

High Entropy Alloy Electrocatalytic Electrode toward Alkaline Glycerol Valorization Coupling with Acidic Hydrogen Production

et al. 2022

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Electrochemical glycerol oxidation reaction (GOR) is an attractive alternative anodic reaction to oxygen evolution reaction for a variety of electrolytic synthesis, thanks to the possibility of mass production of glycerol from biomass and the relative low thermodynamic potential of GOR. The development of high-activity cheap electrocatalysts toward GOR yet faces a daunting challenge. Herein, we experimentally prepare a new range of high entropy alloy (HEA) self-supported electrodes with uniform HEA nanoparticles grown on carbon cloth. The systematic electrochemical studies verify that the HEA-CoNiCuMnMo electrode exhibits attractive performance for GOR electrocatalysis with low overpotential and high selectivity toward formate products. The surface atomic configurations of HEA-CoNiCuMn-Mo are studied by a self-developed machine learning-based Monte Carlo simulation, which points out the catalytic active center to be Mo sites coordinated by Mn, Mo, and Ni. We further develop a hybrid alkali/acid flow electrolytic cell by pairing alkaline GOR with acidic hydrogen evolution reaction using the HEA-CoNiCuMnMo and the commercial RhIr/Ti as the anode and the cathode, respectively, which only requires an applied voltage of 0.55 V to reach an electrolytic current density of 10 mA cm −2 and maintains long-term electrolysis stability over 12 days continuous running at 50 mA cm −2 with Faraday efficiencies of over 99% for H 2 in the cathode and 92% for formate production in the anode.

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Section: Results and Discussionmentioning

confidence: 97%

High Entropy Alloy Electrocatalytic Electrode toward Alkaline Glycerol Valorization Coupling with Acidic Hydrogen Production

et al. 2022

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“…88-2335), 31 and the lattice distortion of PdCuMoNiCo NHSs was derived from the differences in the atomic diameters of the four elements. 32 Compared to the sample before acid treatment (Fig. S4 †), no obvious change morphology in the hollow structure and diameter was observed.…”

Section: Electrochemical Measurementsmentioning

confidence: 84%

A hollow PdCuMoNiCo high-entropy alloy as an efficient bi-functional electrocatalyst for oxygen reduction and formic acid oxidation

et al. 2022

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“…Some attempts to obtain trends within fixed-element composition spaces have been investigated both experimentally [8][9][10][11] and theoretically. [5,[12][13][14] While some studies have attempted to discover trends in the constituent elements for a given catalyzed reaction, [15][16][17] finding appropriate descriptors for which elements to mix for optimal catalysis remains a challenge.…”

Section: Introductionmentioning

confidence: 99%

A Mean‐Field Model for Oxygen Reduction Electrocatalytic Activity on High‐Entropy Alloys**

2022

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High-entropy alloys (HEAs) represent near-equimolar points in the middle of a vast composition space of multi-metallic catalysts. Successful modeling of the catalytic activity of these complex materials allows to search this composition space for optimal catalysts. This study shows the effect of approximating the ligand effect of the surrounding atoms around an adsorption site with a mean-field perturbation. Modeling the electrocatalytic activity of the oxygen reduction reaction on the quinary AgIrPdPtRu HEA, it is shown that the extent of such a mean-field approximation is valid up to and including equimolar ternary alloys, corresponding to 60.3 % of the quinary composition space, by comparing to models that consider the ligand effect locally. When extrapolating to make predictions far from near-equimolar compositions, such as for binary alloys, the mean field has been sufficiently perturbed to cause large discrepancies. Here, the local ligand models thus prove more useful for discovering optimal catalysts.

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High-entropy alloy stabilized active Ir for highly efficient acidic oxygen evolution

Cited by 125 publications

References 48 publications

High Entropy Alloy Electrocatalytic Electrode toward Alkaline Glycerol Valorization Coupling with Acidic Hydrogen Production

High Entropy Alloy Electrocatalytic Electrode toward Alkaline Glycerol Valorization Coupling with Acidic Hydrogen Production

A hollow PdCuMoNiCo high-entropy alloy as an efficient bi-functional electrocatalyst for oxygen reduction and formic acid oxidation

A Mean‐Field Model for Oxygen Reduction Electrocatalytic Activity on High‐Entropy Alloys**

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