Key Takeaways & Executive Findings
- •• A strongly coupled Pt/Mo2N heterostructure on nitrogen-doped reduced graphene oxide (Pt/Mo2N-NrGO) was synthesized using Pt-containing Anderson-type polyoxometalates as precursors, achieving strong interfacial Pt–N–Mo bonding. • The pronounced electronic coupling at the Pt/Mo2N cluster interface facilitates H2O decomposition through synergistic stabilization of Pt-H* and Mo-OH*, enhancing the kinetics of the rate-determining Volmer step in alkaline HER. • The optimized Pt/Mo2N-NrGO catalyst exhibits remarkably low overpotential, high mass activity, and exceptional long-term durability (>500 h at 1500 mA cm-2) in a practical anion-exchange membrane water electrolyzer (AEMWE). • Techno-economic analysis shows a levelized hydrogen production cost of $2.02 kg⁻1, meeting US DOE targets, demonstrating the potential for industrial green hydrogen production.
Abstract
Creating strongly coupled heterostructures with favorable catalytic activities is crucial for promoting the performance of catalytic reactions, especially those involve multiple intermediates. Herein, we fabricated a strongly coupled platinum/molybdenum nitrides nanocluster heterostructure on nitrogen-doped reduced graphene oxide (Pt/Mo₂N–NrGO) for alkaline hydrogen evolution reaction. The well-defined Pt-containing Anderson-type polyoxometalates promote strong interfacial Pt–N–Mo bonding in Pt/Mo2N–NrGO, which exhibits a remarkably low overpotential, high mass activity, and exceptional long-term durability (> 500 h at 1500 mA cm⁻2) in an anion-exchange membrane water electrolyzer (AEMWE). Operando Raman spectroscopy and density functional theory reveal that pronounced electronic coupling at the Pt/Mo₂N cluster interface facilitates the catalytic decomposition of H2O through synergistic stabilization of intermediates (Pt–H* and Mo-OH*), thereby enhancing the kinetics of the rate-determining Volmer step. Techno-economic analysis indicates a levelized hydrogen production cost of $2.02 kg⁻1, meeting the US DOE targets. Our strategy presents a viable pathway to designing next-generation catalysts for industrial AEMWE for green hydrogen production.
1. Introduction
Electrochemical water splitting is a promising route for sustainable hydrogen production, yet the sluggish kinetics of the alkaline hydrogen evolution reaction (HER) remains a bottleneck. Platinum (Pt) is the benchmark catalyst, but its high cost and scarcity limit large-scale application. To address this, researchers have focused on developing Pt-based heterostructures with co-catalysts to enhance activity and durability while reducing Pt loading. However, conventional heterostructures often suffer from weak interfacial coupling and agglomeration, leading to blocked active sites and reduced performance.
Polyoxometalates (POMs) are inorganic anion clusters with well-defined nanostructures, measuring just 1–2 nm in size. These characteristics make them excellent molecular platforms for developing highly efficient electrocatalysts. Our previous works have shown that Anderson-type POMs clusters ([XMo6O24H6]n−, denoted as XMo6, X represents a transition metal), composed of one heteroatom XO6 octahedron with six edge-sharing MoO6 octahedrons, can be used to fine-tune the electronic structure of electrocatalysts with precise atomic doping. Moreover, POMs-derived molybdenum nitride (Mo2N, a catalyst with high conductivity and strong chemical stability) quantum dots can efficiently lower the energy barriers of water dissociation, which is the key rate-limiting Volmer step for the alkaline HER.
Inspired by the above works, we suggest creating a highly coupled cluster heterostructure catalyst to accelerate the sluggish alkaline HER to achieve high-performance AEMWE. The cluster heterostructure features Pt and Mo2N clusters situated on nitrogen-doped reduced graphene oxide (denoted as Pt/Mo2N-NrGO). It is developed using a Pt-containing Anderson-type POMs cluster (demoted as PtMo6), as the precursor. Importantly, the well-defined PtMo6 POMs cluster with inherent Pt–O–Mo covalent bonds promote strong interfacial bonding between Pt and Mo2N clusters in Pt/Mo2N–NrGO. This leads to a wealth of co-catalytic active sites at the interface, significantly enhancing the kinetics of alkaline HER.
Loading authentic research manuscript (Pages 1–5)...
Wenbo Zhou, Yichao Huang, Hanqing Cai, Tao Wang, Haitao Li, Chao Zhang, Lianming Zhao, Lulu Chen, Meihong Liao, Zhiqing Tang, Kai Chen, Jing Gu, Wenpei Gao, Zhuangjun Fan, Zhenhai Wen (2025). A Strongly Coupled Cluster Heterostructure with Pt–N–Mo Bonding for Durable and Efficient H2 Evolution in Anion-Exchange Membrane Water Electrolyzers. Nano-Micro Letters. https://doi.org/10.1007/s40820-025-01798-x
Research & Educational Purpose Only:The translations, structured abstracts, analytical annotations, and data reports provided by SinoTechIntel are intended exclusively for academic research, internal corporate R&D, and educational benchmarking. They do not constitute formal engineering, chemical safety, legal, or professional advice.
Copyright & Intellectual Property Notice: Original copyright of the underlying source articles and experimental data remains with the respective authors, institutions, and original publishing journals. SinoTechIntel claims intellectual property only over its proprietary translations, analytical syntheses, and AEO structured enhancements in accordance with international fair use and academic citation principles.
Frequently Asked Questions
What is the main innovation of this study?
The main innovation is the synthesis of a strongly coupled Pt/Mo2N heterostructure on nitrogen-doped reduced graphene oxide (Pt/Mo2N-NrGO) using Pt-containing Anderson-type polyoxometalates as precursors, which creates strong interfacial Pt–N–Mo bonding. This unique structure enhances the catalytic activity and durability for the alkaline hydrogen evolution reaction.
How does the Pt/Mo2N heterostructure improve the hydrogen evolution reaction?
The pronounced electronic coupling at the Pt/Mo2N cluster interface facilitates the catalytic decomposition of H2O through synergistic stabilization of intermediates (Pt–H* and Mo-OH*), thereby enhancing the kinetics of the rate-determining Volmer step. This leads to a remarkably low overpotential and high mass activity.
What is the significance of the long-term durability test?
The optimized Pt/Mo2N-NrGO catalyst exhibits exceptional long-term durability (>500 h at 1500 mA cm-2) in a practical anion-exchange membrane water electrolyzer (AEMWE), demonstrating its potential for industrial applications where stability is critical.
What is the levelized hydrogen production cost reported in the study?
Techno-economic analysis indicates a levelized hydrogen production cost of $2.02 kg⁻1, which meets the US Department of Energy (DOE) targets, making the proposed catalyst economically viable for green hydrogen production.
What techniques were used to understand the catalytic mechanism?
Operando Raman spectroscopy and density functional theory (DFT) were used to reveal the pronounced electronic coupling at the Pt/Mo2N cluster interface, showing simultaneous binding of Pt with H and Mo2N with OH, which enhances the kinetics of the Volmer step.
Related Technical Papers & Translations
Direct Repair of the Crystal Structure and Coating Surface of Spent LiFePO4 Materials Enables Superfast Li-Ion Migration
The rapid accumulation of spent LiFePO4 (LFP) cathodes from retired lithium-ion batteries necessitates the development of effective and environmental-friendly recycling strategies. In this context, direct regeneration has emerged as a promising approach for reclaiming LFP cathode materials, offering a streamlined pathway to restore their electrochemical functionality. We report an integrated regeneration protocol that simultaneously repairs the degraded crystal structure and reconstructs the damaged carbon coating in spent LFP. The regenerated cathode material had superfast lithium-ion diffusion kinetics and a stable cathode–electrolyte interface, giving a remarkable rate capability with specific capacities of 122 mAh g−1 at 5C and 106 mAh g−1 at 10C (1C = 170 mA g−1). It also maintained capacities of 110.7 mAh g−1 (5C) and 84.1 mAh g−1 (10C) after 400 cycles. It could be used in harsh environments and could be stably cycled at subzero temperatures (−10 and −20 °C) and in solid-state electrolyte batteries. Life cycle assessment combined with economic evaluation using the EverBatt model reveals that this direct regeneration approach has high economic and environmental benefits.
Oxide Semiconductor for Advanced Memory Architectures: Atomic Layer Deposition, Key Requirement and Challenges
Oxide semiconductors (OSs), introduced by the Hosono group in the early 2000s, have evolved from display backplane materials to promising candidates for advanced memory and logic devices. The exceptionally low leakage current of OSs and compatibility with three-dimensional (3D) architectures have recently sparked renewed interest in their use in semiconductor applications. This review begins by exploring the unique material properties of OSs, which fundamentally originate from their distinct electronic band structure. Subsequently, we focus on atomic layer deposition (ALD), a core technique for growing excellent OS films, covering both basic and advanced processes compatible with 3D scaling. The basic surface reaction mechanisms—adsorption and reaction—and their roles in film growth are introduced. Furthermore, material design strategies, such as cation selection, crystallinity control, anion doping, and heterostructure engineering, are discussed. We also highlight challenges in memory applications, including contact resistance, hydrogen instability, and lack of p-type materials, and discuss the feasibility of ALD-grown OSs as potential solutions. Lastly, we provide an outlook on the role of ALD-grown OSs in memory technologies. This review bridges material fundamentals and device-level requirements, offering a comprehensive perspective on the potential of ALD-driven OSs for next-generation semiconductor memory devices.
Laser powder bed fusion of biodegradable Zn-4Cu alloy: Processing, microstructure and properties
Zn's natural degradability and biocompatibility make it a promising candidate for implants, however, its mechanical properties remain insufficient for bone applications. In this study, the performance of Zn was enhanced by developing Zn-Cu alloys via laser powder bed fusion (LPBF). Optimal LPBF parameters for forming stable tracks were achieved by adjusting laser power and scanning speed. Under optimized conditions of 100 W and 100 mm/s, high-density (99.58%) Zn-Cu alloys with improved hardness (68.2HV) and yield strength (160 MPa) were achieved. These improvements are attributed to solid solution strengthening, segregation strengthening, and grain refinement. The Zn-Cu alloys also demonstrated favorable degradation behavior, with a rate of 0.16 mm/year. This degradation is primarily driven by micro-galvanic corrosion between the CuZn5 phase and Zn matrix, along with refined grains and increased grain boundary density. This work demonstrates a viable strategy for fabricating Zn-based implants with enhanced structural integrity and mechanical performance via LPBF.