Bifunctional atomically dispersed ruthenium electrocatalysts for efficient bipolar membrane water electrolysis,Inorganic Chemistry Frontiers

当前位置： X-MOL 学术 › Inorg. Chem. Front. › 论文详情

Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)

Bifunctional atomically dispersed ruthenium electrocatalysts for efficient bipolar membrane water electrolysis
Inorganic Chemistry Frontiers ( IF 6.1 ) Pub Date : 2022-06-24 , DOI: 10.1039/d2qi00892k
Zhipeng Yu _{1,

2,

3} , Chaowei Si ₄ , Francisco Javier Escobar-Bedia ₅ , Alec P. LaGrow ₁ , Junyuan Xu ₆ , Maria J. Sabater ₅ , Isilda Amorim ₁ , Ana Araujo _{1,

2,

3} , Juliana P. S. Sousa ₁ , Lijian Meng ₇ , Joaquim Luis Faria _{2,

3} , Patricia Concepcion ₅ , Bo Li ₄ , Lifeng Liu ₁

Affiliation

Atomically dispersed catalysts (ADCs) have recently drawn considerable interest for use in water electrolysis to produce hydrogen, because they allow for maximal utilization of metal species, particularly the expensive and scarce platinum group metals. Herein, we report the electrocatalytic performance of atomically dispersed ruthenium catalysts (Ru ADCs) with ultralow Ru loading (0.2 wt%). The as-obtained Ru ADCs (Ru (0.2)-NC) are active for both hydrogen evolution reaction (HER) and oxygen evolution reaction (OER), which only require a low overpotential (η) of 47.1 and 72.8 mV to deliver 10 mA cm⁻² for HER in 0.5 M H₂SO₄ and 1.0 M KOH, respectively, and of 300 mV for OER in 1.0 M KOH, showing favorable bifunctionality. Density functional theory (DFT) calculations reveal that the Ru–N bonding plays an important role in lowering the energy barrier of the reactions, boosting the HER and OER activities. Furthermore, the bipolar membrane (BPM) water electrolysis using the bifunctional Ru (0.2)-NC as both HER and OER catalysts can afford 10 mA cm⁻² under a low cell voltage of only 0.89 V, and does not show any performance decay upon 100 h continuous operation, showing great potential for energy-saving hydrogen production.

中文翻译：

用于高效双极膜水电解的双功能原子分散钌电催化剂

原子分散催化剂 (ADC) 最近引起了人们对水电解制氢的极大兴趣，因为它们可以最大限度地利用金属物质，特别是昂贵和稀缺的铂族金属。在此，我们报告了具有超低钌负载量（0.2 wt%）的原子分散钌催化剂（Ru ADC）的电催化性能。所获得的 Ru ADC (Ru (0.2)-NC) 对于析氢反应 (HER) 和析氧反应 (OER) 均具有活性，仅需要 47.1 和 72.8 mV 的低过电势 ( η ) 即可提供 10 mA cm ^-2对于 HER 在 0.5 MH ₂ SO ₄和 1.0 M KOH 分别为 300 mV，在 1.0 M KOH 中 OER 为 300 mV，显示出良好的双功能性。密度泛函理论 (DFT) 计算表明，Ru-N 键在降低反应能垒、提高 HER 和 OER 活性方面发挥着重要作用。此外，使用双功能 Ru (0.2)-NC 作为 HER 和 OER 催化剂的双极膜 (BPM) 水电解可以在仅 0.89 V 的低电池电压下提供 10 mA cm ^-2的电流，并且没有表现出任何性能衰减。连续运行100小时，节能制氢潜力巨大。

更新日期：2022-06-24

点击分享查看原文

点击收藏

阅读更多本刊最新论文本刊介绍/投稿指南11