Planar‐Coordination PdSe2 Nanosheets as Highly Active Electrocatalyst for Hydrogen Evolution Reaction. (4th June 2021)

• Record Type: Journal Article
• Authors: Lin, Zhiping; Xiao, BeiBei; Wang, Zongpeng; Tao, Weiying; Shen, Shijie; Huang, Liangai; Zhang, Jitang; Meng, Fanqi; Zhang, Qinghua; Gu, Lin; Zhong, Wenwu
• Is Part Of: Advanced functional materials. Volume 31:Number 32(2021)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2021-06-04
• Subjects: hydrogen evolution reaction -- PdSe 2 -- planar coordination -- transition metal selenide; Materials -- Periodicals; Chemical vapor deposition -- Periodicals; 620.11
• DOI: 10.1002/adfm.202102321
• Languages: English
• ISSNs: 1616-301X

Abstract

Abstract: The coordination environment is crucial for the activity of an electrocatalyst, which defines the interaction between the central and adjacent atoms. In traditional 2D MX2 (M = Mo, W, etc., X = S, Se), M is usually coordinated with 6 X atoms in either trigonal prismatic (2H) or octahedral (1T) polyhedrons. With such a coordination configuration, only the edge X sites exhibit activity for hydrogen evolution reaction (HER). Here, a planar‐coordination transition metal chalcogenide, PdSe2 is reported, as an efficient electrocatalyst for the HER in an alkaline electrolyte. By reducing the spatial polyhedron coordination to planar polygon coordination, the M sites in PdSe2 can be efficiently activated to interact with the adsorptive intermediates. As a result, both Pd and Se atoms act as active sites for hydrogen evolution with neutral adsorption ability. With an overpotential of 138 mV at 10 mA cm −2, this work advances the exploration of planar‐coordination HER electrocatalysts. Abstract : Planar‐coordination PdSe2 nanosheets are prepared by a solid‐state synthesis method and by following ultrasonic exfoliation. Benefitting from this unique coordination environment, both Pd and Se sites exhibit high hydrogen evolution reaction activity, with a resulting low overpotential of 138 mV at 10 mA cm −2 .