Controlled doping of ultralow amounts Ru on Ni cathode for PEMWE: Experimental and theoretical elucidation of enhanced performance

IF 20.2 1区化学 Q1 CHEMISTRY, PHYSICAL

Applied Catalysis B: Environmental Pub Date : 2024-01-17 DOI:10.1016/j.apcatb.2024.123738

Kyeong-Rim Yeo , Hoyoung Kim , Kug-Seung Lee , Seongbeen Kim , Jinwoo Lee , Haesun Park , Soo-Kil Kim

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Abstract

Proton exchange membrane water electrolysis (PEMWE) is an environmentally benign technology for large-scale hydrogen production. Despite many catalysts being developed to replace Pt, successful development of low-cost catalysts that meet the balance of performance and durability is limited. In this work, atomically dispersed Ru on Ni catalyst-integrated porous transport electrodes were fabricated by a simple electrodeposition. With a trace amount of Ru (< 0.05 mg_Ru·cm⁻²), the Ni_98.1Ru_1.9 cathode catalyst exhibited an overpotential of 35 mV at –10 mA·cm⁻² with excellent stability. Density functional theory calculation revealed that the high performance was driven by optimized adsorption strength and improved mobility of hydrogen on the catalyst surface. The Ni_98.1Ru_1.9 electrode was further verified in a PEMWE cell and resulting performance (6.0 A·cm⁻² at 2.25 V_cell) and stability (0.13 mV·h⁻¹ decay rate at 1 A·cm⁻²) surpassed previously reported non-Pt and even Pt electrodes, demonstrating its readiness as an advanced cathode to replace Pt.

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在用于 PEMWE 的镍阴极上受控掺入超低量 Ru：实验和理论阐明性能的提升

质子交换膜水电解法（PEMWE）是一种大规模制氢的环保技术。尽管开发了许多催化剂来替代铂，但成功开发出兼顾性能和耐久性的低成本催化剂却很有限。在这项工作中，通过简单的电沉积，在镍催化剂集成多孔传输电极上制备了原子分散的 Ru。在添加微量 Ru（0.05 mgRu-cm-2）的情况下，Ni98.1Ru1.9 阴极催化剂在 -10 mA-cm-2 条件下的过电位为 35 mV，且稳定性极佳。密度泛函理论计算表明，催化剂表面对氢的吸附强度得到优化，氢在催化剂表面的流动性得到改善，从而提高了催化剂的性能。Ni98.1Ru1.9 电极在 PEMWE 电池中得到了进一步验证，其性能（2.25 Vcell 时为 6.0 A-cm-2）和稳定性（1 A-cm-2 时的衰减率为 0.13 mV-h-1）均超过了之前报道的非铂电极甚至铂电极，这表明它已准备好成为替代铂的先进阴极。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Applied Catalysis B: Environmental 环境科学-工程：化工

CiteScore

38.60

自引率

6.30%

发文量

1117

审稿时长

24 days

期刊介绍： Applied Catalysis B: Environment and Energy (formerly Applied Catalysis B: Environmental) is a journal that focuses on the transition towards cleaner and more sustainable energy sources. The journal's publications cover a wide range of topics, including: 1.Catalytic elimination of environmental pollutants such as nitrogen oxides, carbon monoxide, sulfur compounds, chlorinated and other organic compounds, and soot emitted from stationary or mobile sources. 2.Basic understanding of catalysts used in environmental pollution abatement, particularly in industrial processes. 3.All aspects of preparation, characterization, activation, deactivation, and regeneration of novel and commercially applicable environmental catalysts. 4.New catalytic routes and processes for the production of clean energy, such as hydrogen generation via catalytic fuel processing, and new catalysts and electrocatalysts for fuel cells. 5.Catalytic reactions that convert wastes into useful products. 6.Clean manufacturing techniques that replace toxic chemicals with environmentally friendly catalysts. 7.Scientific aspects of photocatalytic processes and a basic understanding of photocatalysts as applied to environmental problems. 8.New catalytic combustion technologies and catalysts. 9.New catalytic non-enzymatic transformations of biomass components. The journal is abstracted and indexed in API Abstracts, Research Alert, Chemical Abstracts, Web of Science, Theoretical Chemical Engineering Abstracts, Engineering, Technology & Applied Sciences, and others.