Non-precious metal-based catalysts for water electrolysis to produce H<sub>2</sub> under industrial conditions

Liu, He; Guang, Yu; Cheng, Yujia; Wang, Ni; Hu, Wencheng

doi:10.1039/d3qm00557g

Cited by 13 publications

(1 citation statement)

References 221 publications

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“…70 mV from 303 K (η 500 = 180 mV) to 333 K (η 500 = 110 mV). To the best of our knowledge, this outstanding HER activity of ZrCo 1.75 Rh 0.25 is the highest one among all the electrocatalysts reported so far. ,− More importantly, it can be operated at 300 mA/cm 2 over 400 h. In contrast, the HER performance of NbCo 1.75 Pt 0.25 decayed rapidly (an overpotential increase from 220 to 517 mV) over 150 h (Figure S18). This observation may be attributed to the original stability of intermetallic hosts (Figure S18) as there is a higher bonding state population of the Zr–Co bond than that of the Nb–Co bond at E F (Figure S19).…”

Section: Results and Discussionmentioning

confidence: 89%

Correlation between d Electrons and the Sweet Spot for the Hydrogen Evolution Reaction: Is Platinum Always the Best Electrocatalyst?

Hao,

Guan,

Zhang

et al. 2024

Inorg. Chem.

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Herein, two Laves intermetallic series, ZrCo1.75 M 0.25 and NbCo1.75 M 0.25 (M = Fe, Co, Ni, Ru, Rh, Pd, Os, Ir, and Pt), were synthesized, and their hydrogen evolution reaction (HER) activities were examined to reveal the influence of d electrons to the corresponding HER activities. Owing to the different electronegativity between Zr and Nb (χZr = 1.33; χNb = 1.60), Co and/or M elements receive more electrons in ZrCo1.75 M 0.25 than that of the Nb one. This leads to the overall weak H adsorption energy (ΔG Had) of ZrCo1.75 M 0.25 series compared to that of NbCo1.75 M 0.25 and rationalizes well the superior HER activity of the Rh member compared to that of the Pt one in the ZrCo1.75 M 0.25 series. Under industrial conditions (333 K, 6.0 M KOH), ZrCo1.75Rh0.25 only requires an overpotential of 110 mV to reach the current density of 500 mA/cm2 and can be operated at high current density over 400 h. This work demonstrates that with a proper combination between elements in intermetallic phases, one can manipulate d electrons of the active metal to be closer to the sweet spot (ΔG Had = 0). The Pt member may no longer exhibit the best HER activity in series, and all elements exhibit the potential to outperform the Pt member in the HER with careful control of the d electron population.

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Section: Results and Discussionmentioning

confidence: 89%

Correlation between d Electrons and the Sweet Spot for the Hydrogen Evolution Reaction: Is Platinum Always the Best Electrocatalyst?

Hao,

Guan,

Zhang

et al. 2024

Inorg. Chem.

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Bridging Laboratory Electrocatalysts with Industrially Relevant Alkaline Water Electrolyzers

Wang,

Song,

et al. 2024

Advanced Energy Materials

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The alkaline water electrolyzer (AWE) is the earliest and most mature water‐splitting technology. However, the conventional Raney Ni electrocatalysts dominantly used in AWEs are struggling to meet current demands for higher energy efficiency and cost‐effectiveness in green hydrogen production. Although many promising electrocatalytic materials have been developed using facile preparation methods in the laboratory, they have not received much attention in commercial AWE applications. It is due to the academic negligence on specific operational conditions, critical performance metrics, and material costs associated with industrial AWEs, as well as disregarding the impact of large‐scale electrode manufacturing processes on catalytic performance. Therefore, a timely review to bridge laboratory focus with industrial requirements is essential to guide the future development of water‐splitting electrocatalysts. Here, starting from the differences of operating and testing conditions between laboratory and industrial systems, the gaps in electrocatalytic equipment, evaluation methods, and preparation principles of electrodes are outlined. To narrow these gaps, some academic efforts in advancing industrially relevant electrocatalysts are highlighted and personal perspectives on future opportunities, research focus, and challenges in this field are provided.

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Review of Ni‐Based Materials for Industrial Alkaline Hydrogen Production

Chen,

Olu,

Fan

et al. 2024

ChemSusChem

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Hydrogen has been recognized as a green energy carrier, which can relieve energy shortage and environmental pollution. Currently, alkaline water electrolysis (AWE) driven by renewable energy to produce large‐scale green hydrogen is a mainstream technology. However, tardy cathodic hydrogen evolution reaction (HER) and stability issue of catalysts make it challenging to meet the industrial requirements. Ni‐based materials have attracted wide attention, thanks to their low cost and rich tuning possibilities, and many efforts have focused on their activity and stability. However, due to the significant discrepancy between laboratory and industrial conditions, these catalysts have not been widely deployed in industrial AWE. In this review, we first introduce the differences between laboratory and industrial stage, especially concerning equipment, protocols and evaluation metrics. To shorten these gaps, some strategies are proposed to improve the activity and stability of the Ni‐based catalysts. Besides, some key issues related to the catalysts in industrial AWE device are also emphasized, including reverse‐current and foreign ions in the electrolyte. Finally, the challenges and outlooks on the industrial alkaline AWE are discussed.

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Non-precious metal-based catalysts for water electrolysis to produce H₂ under industrial conditions

Abstract: Hydrogen is the most promising energy carrier to replace fossil fuels due to its sustainability, environmental friendliness, and high energy efficiency. Green electricity can be used to power electrocatalytic water...

Cited by 13 publications

References 221 publications

Correlation between d Electrons and the Sweet Spot for the Hydrogen Evolution Reaction: Is Platinum Always the Best Electrocatalyst?

Correlation between d Electrons and the Sweet Spot for the Hydrogen Evolution Reaction: Is Platinum Always the Best Electrocatalyst?

Bridging Laboratory Electrocatalysts with Industrially Relevant Alkaline Water Electrolyzers

Review of Ni‐Based Materials for Industrial Alkaline Hydrogen Production

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Non-precious metal-based catalysts for water electrolysis to produce H2 under industrial conditions

Abstract: Hydrogen is the most promising energy carrier to replace fossil fuels due to its sustainability, environmental friendliness, and high energy efficiency. Green electricity can be used to power electrocatalytic water...

Cited by 13 publications

References 221 publications

Correlation between d Electrons and the Sweet Spot for the Hydrogen Evolution Reaction: Is Platinum Always the Best Electrocatalyst?

Correlation between d Electrons and the Sweet Spot for the Hydrogen Evolution Reaction: Is Platinum Always the Best Electrocatalyst?

Bridging Laboratory Electrocatalysts with Industrially Relevant Alkaline Water Electrolyzers

Review of Ni‐Based Materials for Industrial Alkaline Hydrogen Production

Contact Info

Product

Resources

About

Non-precious metal-based catalysts for water electrolysis to produce H₂ under industrial conditions