Haoqiang Song, Jingkun Yu, Zhiyong Tang, Bai Yang, Siyu Lu
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引用次数: 115
Abstract
Designing a stable and efficient dual-functional catalyst for the hydrogen evolution and oxygen evolution reactions (HER/OER) is of great significance to the development of hydrogen production by water splitting. This work reports on novel halogen (X = F, Cl, and Br)-doped carbon dots modifying amorphous cobalt phosphide (X-CDs/CoP), which can be tuned by the choice of X-CDs to have urchin, Pinus bungeana, and Albizia julibrissin type structures. The different characteristics of the various X-CDs led to different formation mechanisms and final structures. As a bifunctional catalyst, urchin-shaped F-CDs/CoP crystals achieve superior electrocatalytic performance, exhibiting excellent HER/OER activity and sustained stability in an alkaline solution. For overall water splitting, they provide current density of 10 mA cm−2 and require a low cell voltage of 1.48 V in 1 M KOH. In addition, the catalytic performance shows negligible degradation after 100 h, thus demonstrating excellent long-term cycling stability. Density functional theory calculations show that the improved electrocatalytic performance of F-CDs/CoP catalysts is due to the coupling interface between CoP and F-CDs, which optimizes the hydrogen/oxygen adsorption energy and accelerates the water splitting kinetics. This work provides guidance for the rational design of transition metal phosphide electrocatalysts with outstanding performance.
期刊介绍:
Established in 2011, Advanced Energy Materials is an international, interdisciplinary, English-language journal that focuses on materials used in energy harvesting, conversion, and storage. It is regarded as a top-quality journal alongside Advanced Materials, Advanced Functional Materials, and Small.
With a 2022 Impact Factor of 27.8, Advanced Energy Materials is considered a prime source for the best energy-related research. The journal covers a wide range of topics in energy-related research, including organic and inorganic photovoltaics, batteries and supercapacitors, fuel cells, hydrogen generation and storage, thermoelectrics, water splitting and photocatalysis, solar fuels and thermosolar power, magnetocalorics, and piezoelectronics.
The readership of Advanced Energy Materials includes materials scientists, chemists, physicists, and engineers in both academia and industry. The journal is indexed in various databases and collections, such as Advanced Technologies & Aerospace Database, FIZ Karlsruhe, INSPEC (IET), Science Citation Index Expanded, Technology Collection, and Web of Science, among others.