Self-supporting Co 0.85 Se nanosheets anchored on Co plate as highly efficient electrocatalyst for hydrogen evolution re
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stitute for Advanced Interdisciplinary Research (iAIR), Collaborative Innovation Center of Technology and Equipment for Biological Diagnosis and Therapy in Universities of Shandong, University of Jinan, Jinan 250022, China 2 Qilu University of Technology (Shandong Academy of Sciences), Jinan 250353, China 3 State Key Laboratory of Crystal Materials, Shandong University, Jinan 250100, China © Tsinghua University Press and Springer-Verlag GmbH Germany, part of Springer Nature 2020 Received: 9 February 2020 / Revised: 15 June 2020 / Accepted: 25 June 2020
ABSTRACT Electrocatalytic water splitting via hydrogen evolution reaction (HER) represents one of promising strategies to gain hydrogen energy. In current work, self-supporting Co0.85Se nanosheets network anchored on Co plate (Co0.85Se NSs@Co) is fabricated by employing easily tailorable Co metal plate as the source conductive substrate. The scalable dealloying and hydrothermal selenization strategy was employed to build one layer of three dimensional interlinking Co0.85Se nanosheets network on the surface of Co plate. Benefiting from bulky integrated architecture and rich active sites, the as-made Co0.85Se NSs@Co exhibits superior electrocatalytic activity and long-term catalytic durability toward HER. It only requires lower overpotentials of 121 and 162 mV to drive the current density of 10 mA·cm−2 for hydrogen evolution in 0.5 M H2SO4 and 1 M KOH solution. Especially, no evident activity decay occurs upon 1,500 cycles or continuous test for 20 h at 10 mA·cm−2 in both acidic and alkaline electrolytes. With the merits of exceptional performances, scalable production, and low cost, the self-supporting Co0.85Se NSs@Co holds prospective application potential as stable and binder-free electrocatalysts for hydrogen generation in a wide range of electrolyte.
KEYWORDS hydrogen evolution reaction, Co0.85Se, electrocatalyst, dealloying, hydrothermal selenization
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Introduction
Extensive uses of fossil fuels have generated increasing energy consumption and ecological environment destruction. Developing clean and green energy sources has been one of intense research issues considering the sustainable development [1–4]. Compared with other renewable energy, such as solar, wind, and geothermal energy, hydrogen has been considered to be one of the most promising clean energy owing to its zero release for CO2, tremendous reserves, and superior power density [5–7]. Hydrogen evolution reaction (HER) via water splitting over electrocatalysts has been demonstrated to be one of favorable strategies to produce hydrogen with high sustainability and no pollution [8–10]. Enormous efforts have been paid to explore highly efficient electrocatalysts for HER in last several decades. Up to now, noble metals, such as Pt [11], Ru [12], Rh [13], have been found to be one class of the most active electrocatalysts for HER due to the small overpotential in both acidic and alkaline media. However, their low abundance and high price limit the widespread applications for hydrogen generation [14]. Con
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