In:
Journal of Materials Chemistry A, Royal Society of Chemistry (RSC), Vol. 11, No. 6 ( 2023), p. 2769-2779
Abstract:
Doping transition metal electrocatalysts with Ru is an effective strategy to achieve the balance between high-efficiency performance and low preparation cost. Herein, we prepared a series of Ru-doped and self-supported Ru x -NiFe-MOF/NFF electrodes under solvothermal conditions. In the synthesis process, some Ru 3+ ions were reduced to metallic Ru nanoparticles and further coated by NiFe-MOF sheets, while the residual Ru 3+ ions were diffused into the lattice of NiFe-MOFs. The optimal Ru 9.1 -NiFe-MOF/NFF showed high electrocatalytic activity for the hydrogen evolution reaction (HER) with an overpotential of 17 mV @ 10 mA cm −2 , which was much better than that of many reported catalysts. For the oxygen evolution reaction (OER), a low overpotential of 202 mV @ 10 mA cm −2 was required. When used as both an anodic and a cathodic electrocatalyst, the Ru 9.1 -NiFe-MOF/NFF couple demonstrated outstanding overall water splitting performance with a cell voltage of 1.47 V @ 10 mA cm −2 . Moreover, the electrocatalytic activity of the bifunctional Ru 9.1 -NiFe-MOF/NFF electrode could be maintained over 90 h. Based on analysis using various characterization techniques, the electrocatalytic performance of Ru 9.1 -NiFe-MOF/NFF could be attributed to the intrinsic activity of Ru sites, the synergistic effect of various metal species, and the in situ transformation of Ni/Fe sites. This work provides insight into the design of a bifunctional Ru-doped electrocatalyst for overall water splitting.
Type of Medium:
Online Resource
ISSN:
2050-7488
,
2050-7496
Language:
English
Publisher:
Royal Society of Chemistry (RSC)
Publication Date:
2023
detail.hit.zdb_id:
2702232-8
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