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bimetal Ni-Fe alloy 1

carbon deposition 1

core-shell nanoarrays 1

electrocatalysts 1

hydrogen evolution reaction (HER) 1

layered double hydroxide 1

layered double hydroxides (LDHs) 1

long-term stability 1

methanation 1

oxygen evolution reaction 1

oxygen evolution reaction (OER) 1

photoelectrochemical water splitting (PEC) 1

sintering 1

ternary layered double hydroxides 1

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Layered double hydroxide-based core-shell nanoarrays for efficient electrochemical water splitting

Wenfu Xie, Zhenhua Li, Mingfei Shao, Min Wei

Frontiers of Chemical Science and Engineering 2018, Volume 12, Issue 3, Pages 537-554 doi: 10.1007/s11705-018-1719-6

Abstract: Designing LDHs into hierarchical architectures (e.g., core-shell nanoarrays) is one of the most promisingBy classifying different nanostructured materials combined with LDHs, a number of LDH-based core-shelldevelopments and challenges in developing promising electrocatalysts based on hierarchical nanostructured LDHs

Keywords： layered double hydroxides (LDHs) core-shell nanoarrays oxygen evolution reaction (OER) hydrogen evolution

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Synergistic effect of V and Fe in Ni/Fe/V ternary layered double hydroxides for efficient and durable

Frontiers of Chemical Science and Engineering 2023, Volume 17, Issue 1, Pages 102-115 doi: 10.1007/s11705-022-2179-6

Abstract: Herein, via a one-pot hydrothermal method, Ni/Fe/V ternary layered double hydroxides (NiFeV-LDH) derivedBy changing the feeding ratio of Fe and V salts, the prepared ternary hydroxides were optimized.an Fe:V ratio of 0.5:0.5, NiFeV-LDH exhibits outstanding OER activity superior to that of the binary hydroxidesIn contrast, the binary hydroxides present quick decay at 200 mA·cm^–2 or even reduced current

Keywords： oxygen evolution reaction electrocatalysts ternary layered double hydroxides long-term stability

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Bimetallic Ni-Fe catalysts derived from layered double hydroxides for CO methanation from syngas

Honggui Tang, Shuangshuang Li, Dandan Gong, Yi Guan, Yuan Liu

Frontiers of Chemical Science and Engineering 2017, Volume 11, Issue 4, Pages 613-623 doi: 10.1007/s11705-017-1664-9

Abstract: Carbon deposition and sintering of active components such as nano particles are great challenges for Ni-based catalysts for CO methanation to generate synthetic natural gas from syngas. Facing the challenges, bimetallic catalysts with different Fe content derived from layered double hydroxide containing Ni, Fe, Mg, Al elements were prepared by co-precipitation method. Nanoparticles of Ni-Fe alloy were supported on mixed oxides of aluminium and magnesium after calcination and reduction. The catalysts were characterized by Brunner-Emmett-Teller (BET), X-ray diffraction, hydrogen temperature programmed reduction, inductively coupled plasma, X-ray photoelectron spectroscopy, transmission electron microscopy and thermogravimetric techniques, and their catalytic activity for CO methanation was investigated. The results show that the Ni-Fe alloy catalysts exhibit better catalytic performance than monometallic catalysts except for the Ni4Fe-red catalyst. The Ni2Fe-red catalyst shows the highest CO conversion (100% at 260–350 °C), as well as the highest CH selectivity (over 95% at 280–350 °C), owing to the formation of Ni-Fe alloy. In stability test, the Ni2Fe-red catalyst exhibits great improvement in both anti-sintering and resistance to carbon formation compared with the Ni0Fe-red catalyst. The strong interaction between Ni and Fe element in alloy and surface distribution of Fe element not only inhibits the sintering of nanoparticles but restrains the formation of Ni clusters.

Keywords： methanation layered double hydroxide bimetal Ni-Fe alloy sintering carbon deposition