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Amorphous 3D pomegranate-like NiCoFe nanoassemblies derived by bi-component cyanogel reduction for outstanding oxygen evolution reaction

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Journal of Energy Chemistry 2021年第2期30卷 260-267,I0009页

作者： Zi-Juan Wang Mi-Xue Jin Lu Zhang Ai-Jun Wang Jiu-Ju Feng Key Laboratory of the Ministry of Education for Advanced Catalysis Materials College of Chemistry and Life SciencesCollege of Geography and Environmental SciencesZhejiang Normal UniversityJinhua 321004ZhejiangChina

As a representative type of self-supported templates, cyano-bridged cyanogels provide ideal plateaus for synthesis of three-dimensional(3 D) nanostructures. Herein, 3 D pomegranate-like Fe-doped NiCo nanoassemblies(3 D PG-NiCoFe NAs) were synthesized via facile one-step bi-component cyanogel reduction with NaBH_4 as the reducing agent. Specifically, the influence of the incorporated Fe amount was carefully investigated by finely adjusting the feeding molar ratios of the Ni/Co/Fe atoms in the *** virtue of the unique structure and enriched oxygen vacancies originated from well-modulated electronic structures, the 3 D PG-NiCoFe-211 NAs exhibited outstanding electrocatalytic performances for oxygen evolution reaction(OER) in alkaline solution, outperforming commercial RuO_2 catalyst. The current incorporation of foreign metal atom into host material provides some valuable insights into design and synthesis of metal-based nanocatalysts for constructing practical water splitting devices.

关键词： Transition-metal-based nanocatalysts cyanogel Three-dimensional pomegranate-like nanoassemblies Oxygen vacancy Oxygen evolution reaction

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Hollow PtNi alloy nanospheres with enhanced activity and methanol tolerance for the oxygen reduction reaction

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Nano Research 2016年第11期9卷 3494-3503页

作者： Huimin Liu Xinyu Liu Yumei Li Yufeng Jia Yawen Tang Yu Chen Key Laboratory of Macromolecular Science of Shaanxi Province School of Materials Science and Engineering Shaanxi Normal University Ki'an 710062 China Jiangsu Key Laboratory of New Power Batteries Jiangsu Collaborotive Innovation Center of Biomedical Functional Moterials School of Chemistry and Materiols Science Nanjing Normal University Nonjing 210023 China

The development of active and methanol-tolerant cathode electrocatalysts for the oxygen reduction reaction （ORR） is extremely important for accelerating the commercial viability of direct methanol fuel cells （DMFCs）. In this work, we present an efficient and template-free route for facile synthesis of cyanide （CN^-）-functionalized PtNi hollow nanospheres （PtNi@CN HNSs） with a high alloying degree using a simple cyanogel reduction method at room temperature. The physical and electrocatalytic properties of the PtNi@CN HNSs were investigated by various physical and electrochemical techniques. The PtNi@CN HNSs exhibited significantly enhanced electrocatalytic activity, durability, and particular methanol tolerance for the ORR as compared to commercial Pt black, and thus they are promising cathode electrocatalysts for DMFCs.

关键词： cyanogel PtNi alloy chemical functionalization oxygen reduction reaction methanol tolerance

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Trimetallic PtRhNi alloy nanoassemblies as highly active electrocatalyst for ethanol electrooxidation

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Nano Research 2017年第10期10卷 3324-3332页

作者： Huimin Liu Jiahui Li Lijuan Wang Yawen Tang Bao Yu Xia Yu Chen Key Laboratory of Macromolecular Science of Shaanxi Province Shaanxi Key Laboratory for Advanced Energy Devices Shaanxi Engineering Lab for Advanced Energy Technology School of Materials Science and Engineering Shaanxi Normal University 620 Changan Road Xi'an 710062 China Jiangsu Key Laboratory of New Power Batteries Jiangsu Collaborative Innovation Center of Biomedical Functional Materials School of Chemistry and Materials Science Nanjing Normal University 1 Wenyuan Road Nanjing 210023 China A key laboratory of Material Chemistry for Energy Conversion and Storage Ministry of Education Hubei Key Laboratory of Material Chemistry and Service Failure School of Chemistry and Chemical Engineering Wuhan National Laboratory for Optoelectronics Huazhong University of Science and Technology (HUST) 1037 Luoyu Road Wuhan 430074 China Shenzhen Institute of Huazhong University of Science and Technology 9 Yuexing Road Shenzhen 518000 China

Although nanostructures based on noble metal alloys are widely utilized in （electro）catalysis, their low-temperature synthesis remains an enormous challenge due to the different Nernst equilibrium potentials of metal precursors. Herein, we describe the successful synthesis of trimetallic PtRhNi alloy nanoassemblies （PtRhNi-ANAs） with tunable Pt/Rh ratios using a simple mixed cyanogel reduction method and provide a detailed characterization of their chemical composition, morphology, and structure. Additionally, the electrochemical properties of PtRhNi-ANAs are examined by cyclic voltammetry, revealing composition- dependent electrocatalytic activity in the ethanol oxidation reaction （EOR）. Compared to a commercial Pt black electrocatalyst, optimized Pt3Rh1Ni2-ANAs display remarkably enhanced EOR electrocatalytic performance in alkaline media.

关键词： cyanogel trimetallic alloy electrocatalysis activity ethanol oxidation reaction

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Reduced graphene oxide supported PdNi alloy nanocrystals for the oxygen reduction and methanol oxidation reactions

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Green Energy & Environment 2018年第4期3卷 375-383页

作者： Hui-Min Liu Shu-He Han Ying-Ying Zhu Pei Chen Yu Chen Key Laboratory of Macromolecular Science of Shaanxi Province Shaanxi Key Laboratory for Advanced Energy Devices School of Materials Science and Engineering Shaanxi Normal University

The research on electrocatalysts with relatively lower price than Pt and excellent electrocatalytic performance for the cathode oxygen reduction reaction(ORR) and anode methanol oxidation reaction(MOR) is vital for the development of direct methanol fuel cells(DMFCs). In this work, we develop a cyanogel-reduction method to synthesize reduced graphene oxide(rGO) supported highly dispersed PdNi alloy nanocrystals(PdNi/rGO) with high alloying degree and tunable Pd/Ni ratio. The large specific surface area and the d-band center downshift of Pd result in excellent activity of Pd4 Ni1/rGO nanohybrids for the ORR. The modification of Pd electronic structure can facilitate the adsorption of CH3 OH on Pd surface and the highly oxophilic property of Ni can eliminate/mitigate the COadsintermediates poisoning, which make PdNi/r GO nanohybrids possess superior MOR activity. In addition, rGO improve the stability of PdNi alloy nanocrystals for the ORR and MOR. Due to high activity and stability for the ORR and MOR, PdNi/rGO nanohybrids are promising to be an available bifunctional electrocatalyst in DMFCs.

关键词： cyanogel reduction Reduced graphene oxide PdNi alloy nanocrystals Oxygen reduction reaction Methanol oxidation reaction

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