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10. Heterostructured electrocatalysts for the oxygen evolution reaction.

Author

Zheng, Shao-Lan, Xu, Hui-Min, Zhu, Hong-Rui, Shuai, Ting-Yu, Zhan, Qi-Ni, Huang, Chen-Jin, and Li, Gao-Ren

Abstract

In recent years, with the global response to the emission reduction pressure caused by climate change, global awareness of green hydrogen has progressively grown. Electrolysis of water is the only way to create green hydrogen. Among them, one of the semi-reactions of the electrolysis of water is the oxygen evolution reaction (OER). One of the bottlenecks limiting the total energy efficiency of green hydrogen production from water electrolysis is its intricate four-electron transfer process. Developing highly efficient oxygen evolution catalysts is essential to increasing the efficiency of the water electrolysis process. Therefore, researchers have been exploring high-performance OER catalysts. In recent years, heterostructured electrocatalysts have shown surprisingly good performance in OER processes due to their unique structural characteristics, including synergistic effects, strain effects, and electronic interactions. This paper reviews the reaction mechanism of the OER in various pH environments, highlights the advantages of heterostructure catalysts, and provides an overview of OER heterostructure electrocatalysts. This review focuses mainly on the overall facilitating effect of heterostructures on the OER process. The aim is to emphasize the advantages of heterostructure catalysts over one-component catalysts. The paper discusses the preparation of heterostructures and explores the relationship between their structures and electrochemical properties. By providing new insights into the interfacial chemistry of OER heterostructure electrocatalysts, this review sheds light on the future opportunities and challenges for developing OER heterostructure catalysts, both in terms of fundamental understanding and practical applications. [ABSTRACT FROM AUTHOR]

Published
2024
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20. Fe-Doped Ni2P/NiSe2Composite Catalysts for Urea Oxidation Reaction (UOR) for Energy-Saving Hydrogen Production by UOR-Assisted Water Splitting

Author

Huang, Chen-Jin, Zhan, Qi-Ni, Xu, Hui-Min, Zhu, Hong-Rui, Shuai, Ting-Yu, and Li, Gao-Ren

Abstract

The development of efficient urea oxidation reaction (UOR) catalysts helps UOR replace the oxygen evolution reaction (OER) in hydrogen production from water electrolysis. Here, we prepared Fe-doped Ni2P/NiSe2composite catalyst (Fe–Ni2P/NiSe2-12) by using phosphating-selenizating and acid etching to increase the intrinsic activity and active areas. Spectral characterization and theoretical calculations demonstrated that electrons flowed through the Ni–P–Fe–interface–Ni–Se–Fe, thus conferring high UOR activity to Fe–Ni2P/NiSe2-12, which only needed 1.39 V vs RHE to produce the current density of 100 mA cm–2. Remarkably, this potential was 164 mV lower than that required for the OER under the same conditions. Furthermore, EIS demonstrated that UOR driven by the Fe–Ni2P/NiSe2-12 exhibited faster interfacial reactions, charge transfer, and current response compared to OER. Consequently, the Fe–Ni2P/NiSe2-12 catalyst can effectively prevent competition with OER and NSOR, making it suitable for efficient hydrogen production in UOR-assisted water electrolysis. Notably, when water electrolysis is operated at a current density of 40 mA cm–2, this UOR-assisted system can achieve a decrease of 140 mV in the potential compared to traditional water electrolysis. This study presents a novel strategy for UOR-assisted water splitting for energy-saving hydrogen production.

Published
2024
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38. Recent advances in the regulation of the coordination structures and environment of single-atom catalysts for carbon dioxide reduction reaction.

Author

Zhan, Qi-Ni, Shuai, Ting-Yu, Xu, Hui-Min, Zhang, Zhi-Jie, and Li, Gao-Ren

Abstract

The development of science and technology, rapid population growth and increasing production demands have resulted in an increase in the emission of CO2 as a significant source of environmental pollution and the greenhouse effect, which pose a considerable threat to the development of human beings and the environment. Presently, the reduction of CO2 by electrochemical devices has become one of the most promising ways to effectively reduce the concentration of CO2 in the atmosphere. This is because the CO2 electrochemical reduction reaction (CO2RR) has numerous advantages, such as mild reaction conditions, controllable reaction products, simple experimental operation, and use of renewable raw materials. Recently, due to their advantages of high atomic utilization and simple and uniform active sites, single-atom catalysts (SACs) have shown high catalytic activity and selectivity for the CO2RR, providing a promising direction for the development of highly efficient conversion of CO2. Herein, the research progress on SACs for the CO2RR in recent years is reviewed based on three aspects, including catalytic reaction principle, catalytic reaction influencing factors and application of metal-based SACs. The effects of metal type, active site coordination structure, coordination number and coordination environment of SACs on the CO2RR are discussed in detail. Finally, the challenges and future development directions of SACs in the field of CO2RR are analyzed. [ABSTRACT FROM AUTHOR]

Published
2023
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39. Association of atherosclerotic plaque features with collateral circulation status in elderly patients with chronic carotid stenosis

Author

Xu, Hui-Min, Huo, Ran, Xin, Rui-Jing, Yang, Dan-Dan, Liu, Ying, Lang, Ning, Zhao, Xi-Hai, Wang, Tao, and Yuan, Hui-Shu

Subjects
Collateral circulation, Magnetic resonance imaging, Carotid stenosis, Computed tomography angiography, Atherosclerosis, Research Article
Abstract

Objective To determine the association of carotid plaque features with collateral circulation status in elderly patients with moderate to severe carotid stenosis. Methods Elderly patients (> 60 years) with moderate to severe carotid stenosis were recruited and categorized into good and poor collateral circulation groups, and underwent magnetic resonance imaging and computed tomography imaging. The carotid plaque features including lipid-rich necrotic core, intraplaque hemorrhage, calcification, and fibrous cap rupture (FCR) were evaluated, and maximum wall thickness, normalized wall index (NWI), and luminal stenosis were measured. The association between these variables and collateral circulation status was analyzed. Results Of the 97 patients (78 males, mean age: 69.0 ± 6.1 years), 19 (19.6%) had poor collaterals. The poor collateral group had a significantly higher NWI (93.7% ± 5.0% vs. 89.0% ± 7.9%, P = 0.011), a greater extent of stenosis (80.0% ± 11.4% vs. 75.3% ± 9.4%, P = 0.036) and FCR (84.2% vs. 55.1%, P = 0.020) compared with good collateral group. Carotid NWI (OR = 3.83, 95% CI: 1.36–10.82, P = 0.011) and more FCR (OR = 6.77, 95% CI: 1.35–33.85, P = 0.020) were associated with poor collateral circulation after adjustment for the confounding factors. The combination of NWI, FCR, systolic blood pressure, and triglycerides had the highest area-under-the-curve (AUC = 0.85) for detection of poor collaterals. Conclusions Carotid plaque features, specifically NWI and FCR, are independently associated with poor collateral circulation, and the combination of carotid plaque features and traditional risk factors has a stronger predictive value for poor collateral circulation than plaque features alone.

Published
2020

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