Rui Liu, Zunhang Lv, Changli Wang, Chongao Tian, Feilong Dong, Xiao Feng, Bo Wang, Wenxiu Yang
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引用次数: 0
摘要
碱性阴离子交换膜水电解槽（AEMWE）在清洁制氢方面具有广阔的前景，但在高电流密度下存在效率低和不稳定性等问题。本文报道了一种高效的双位点结构Ru基催化剂Ru NC/ RuSA-N2O2，用于在实际的AEMWE中促进HER。优化后的RuSA-N2O2位点设计了动态H迁移路径，有效缓解了Ru簇周围的强H*吸附，实现了H*的快速脱附。这种独特的双位点结构使得Ru团簇的H*和RuSA-N2O2位点之间的H结合通道连续构建，避免了H*的过度吸附和Ru团簇的覆盖。使用Ru NC/ RuSA-N2O2的AEMWE（仅80 μ gRu cm - 2）在1.82 V下可以达到3 A cm - 2，并且在600 h内具有出色的稳定性，衰减仅为30 μ V h - 1（在1 A cm - 2下）。本研究强调了双位点结构的合理设计通过促进AEMWE活性和稳定性的协同机制调节H迁移动态。
Dynamic H Migration Pathways Engineered by Ru Dual-Site Architecture for High-Performing Anion Exchange Membrane Water Electrolyzers
Alkaline anion exchange membrane water electrolyzers (AEMWE) are promising for clean hydrogen production, yet encounter challenges such as low efficiency and instability at high current densities. Herein, an efficient Ru-based catalyst with a dual-site architecture (Ru NC/RuSA–N2O2) is reported, for boosting HER in practical AEMWE. The optimized RuSA–N2O2 sites engineer dynamic H migration pathways that effectively alleviate the strong H* adsorption around Ru clusters, reaching rapid H* desorption. This unique dual-site configuration enables the construction of successive channels of H combination between H* from Ru clusters and RuSA-N2O2 sites, avoiding the over-adsorption of H* and the overlay of Ru clusters. An AEMWE using Ru NC/RuSA–N2O2 (with only 80 µgRu cm−2) can reach 3 A cm−2 at only 1.82 V and exhibits excellent stability for 600 h with a decay of only 30 µV h−1 (at 1 A cm−2). This work highlights the rational design of dual-site architecture regulates H migration dynamics through synergistic mechanisms for activity and stability promotion in AEMWE.
期刊介绍：
Established in 2011, Advanced Energy Materials is an international, interdisciplinary, English-language journal that focuses on materials used in energy harvesting, conversion, and storage. It is regarded as a top-quality journal alongside Advanced Materials, Advanced Functional Materials, and Small.
With a 2022 Impact Factor of 27.8, Advanced Energy Materials is considered a prime source for the best energy-related research. The journal covers a wide range of topics in energy-related research, including organic and inorganic photovoltaics, batteries and supercapacitors, fuel cells, hydrogen generation and storage, thermoelectrics, water splitting and photocatalysis, solar fuels and thermosolar power, magnetocalorics, and piezoelectronics.
The readership of Advanced Energy Materials includes materials scientists, chemists, physicists, and engineers in both academia and industry. The journal is indexed in various databases and collections, such as Advanced Technologies & Aerospace Database, FIZ Karlsruhe, INSPEC (IET), Science Citation Index Expanded, Technology Collection, and Web of Science, among others.
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