CHEMICAL ENGINEERING JOURNAL
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2021
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IF 13.273
Chun Li,Long Zhang,Ying Zhang,Yan Zhou,Jingwen Sun,Xiaoping Ouyang,Xin Wang,Junwu Zhu,Yongsheng Fu
Designing a highly efficient and low-cost electrocatalyst for hydrogen evolution reaction (HER) is of great importance to produce high-purity hydrogen, yet it still remains a huge challenge. Here, we present a facile synthesis of this electrocatalyst, PtRu alloy nanoparticles supported on C 2 N nanosheets , using a condensation-reduction approach. The PtRu@C 2 N exhibits comparable performance than the commercial Pt/C and higher efficiency than monometallic Pt@C 2 N and Ru@C 2 N in both acidic and alkaline conditions. The highly enhanced activity and fast kinetics of PtRu@C 2 N were attributed to the large electrochemical active surface area, unique electronic structure of PtRu nanoparticles on C 2 N nanosheets. Density functional theory calculations show that the alloy effect and the metal-support interaction in PtRu@C 2 N catalyst optimizes the adsorption energy of H atom and other intermediates, resulting in the improvement of HER activity.
研究领域:
材料科学
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电化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2023
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IF 6.2
Yuanjun Liu,Longkun Zuo,Yuyu Liu,Yiru Wu,Xingmei Guo,Junhao Zhang,Fu Cao,Xiangjun Zheng,Guoxing Zhu
Hydrogen oxidation reaction (HOR) with alkaline solution is an important process for anion exchange membrane hydrogen-oxygen fuel cells, while it presents slow kinetics because it contains the coupling of adsorbed hydrogen (H ad ) and hydroxyl (OH ad ) species. Herein, PtRu alloy network-like structure with small size was prepared by a solution phase reduction route, which acts as an electrocatalyst for HOR. The presence of Ru changed the d -band center of Pt and so optimized the hydrogen bonding energy on Pt sites. At the same time, Ru species provides functional surface for the adsorption of OH species. The ultrathin size of the alloy units provides richness of exposed active sites for HOR. Benefited from the above factors, the obtained PtRu alloy with Pt:Ru ratio of 1:1 shows the optimized catalytic activity, providing an exchange current density of 1.93 mA cm −2 , which is 2.7-fold and 1.5-fold of those for commercial Pt/C and pristine Pt catalyst, respectively. This work provides a new advanced electrocatalyst for alkaline HOR.
研究领域:
材料科学
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电化学
✓ 已验证
产品关联
DOI
高影响因子
Molecular Catalysis
·
2024
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IF 3.9
Kaili Wang,Tingting Zhou,Jia He,Zhen Cao,Zaiyong Jiang
Pt based electrocatalysts are considered as very promising for methanol oxidation reaction (MOR). Especially, the PtRu alloy catalysts has attracted more and more attentions. However, the catalytic efficiency of PtRu electrocatalyst is seriously hampered originated from the poisoning effect of CO* intermediate during MOR process. Herein, we have regulated the Pt/Ru atom ratio and controlled the morphology to optimize electronic structures of the alloy for achieving excellent MOR performance. The obtained Pt 2 Ru 1 alloy nanowires display the most negative peak potential of CO oxidation in contrast to commercial Pt/C, PtRu/C catalysts, Pt 3 Ru 1 and Pt 1 Ru 1 alloy nanowires, indicating an excellent anti CO poisoning activity. In addition, the adsorption capacity of OH* on Pt 2 Ru 1 alloy nanowires is obviously improved compared to commercial Pt/C and PtRu/C electrocatalysts, which is in favor of the oxidizing of CO* intermediate. Therefore, the Pt 2 Ru 1 alloy nanowires exhibit significantly enhanced specific activity (2.30 mA cm −2 ) and mass activity (1.29 A mg Pt −1 ) towards MOR compared to those of commercial Pt/C and PtRu/C electrocatalysts. The research offers a potential insight for designing highly efficient electrocatalysts for MOR.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2022
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IF 6.371
Kaiyu Dong,Houkang Pu,Te Zhang,Huizhen Dai,Xihui Zhao,Luming Zhou,Kuankuan Wang,Yingying Wang,Yujia Deng
Designing and modulating the morphological structure of catalysts is of great significance to improve their catalytic activity and stability. In this work, PtRu alloy nanodendrites with tunable components were constructed by the introduction of Ru. Owing to the presence of electron transfer in the alloy nanocatalysts and their unique nanodendritic structures, Pt 0.8 Ru 0.2 alloy nanocatalysts with optimal composition exhibited excellent electrocatalytic activity and stability in ethylene glycol oxidation reaction (EGOR) and methanol oxidation reaction (MOR). Among the nano-catalysts, mass activities of Pt 0.8 Ru 0.2 nanodendritic catalysts to EGOR and MOR were 6.1 A mg −1 and 4.6 A mg −1 , and the specific activities were 11.5 mA cm −2 and 8.68 mA cm −2 , respectively, much better than those of commercial Pt/C catalysts. This work provides a strategy for designing efficient PtRu catalysts for fuel cells.
研究领域:
催化
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纳米材料
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电化学
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燃料电池
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）