CoAl LDH@Ni-MOF-74 S-Scheme Heterojunction for Efficient Hydrogen Evolution
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RESEARCH ARTICLE
CoAl LDH@Ni‑MOF‑74 S‑Scheme Heterojunction for Efficient Hydrogen Evolution Zhiliang Jin1,2 · Yanbing Li2 · Qingxiang Ma1 Received: 7 July 2020 / Revised: 10 July 2020 / Accepted: 11 July 2020 © The Author(s) 2020
Abstract Metal–organic frameworks (MOFs) and layered double hydroxides (LDHs) have been considered to be one of the most promising and worthy hot spot materials to develop advanced catalysts for efficient hydrogen evolution due to their prominent characteristics, including unique structures, environmentally friendly nature, high redox activities, and homogeneously effective utilization of transition metal atoms. In this work, the delicate S-scheme heterojunction photocatalyst, CoAl LDH@ Ni-MOF-74, was rationally designed and successfully constructed by coupling Ni-MOF-74 with CoAl LDH based on their peculiar structure, excellent electronic properties, and opposite surface potential for enhancing hydrogen generation activity under visible light irradiation. The CoAl LDH nanolayers evenly and dispersedly load on the surface of Ni-MOF-74. The CoAl LDH@Ni-MOF-74 exhibited higher photocatalytic hydrogen evolution activity compared with Ni-MOF-74 and CoAl LDH alone, mainly because the formation of the CoAl LDH@Ni-MOF-74 S-scheme heterojunction accelerated the recombination of several electrons (from conduction band (CB) of Ni-MOF-74) and holes (from valence band (VB) of CoAl LDH) and prevented the recombination of other electrons (from CB of CoAl LDH) and holes (from VB of Ni-MOF-74). Keywords CoAl LDH · Ni-MOF-74 · S-scheme heterojunction · Hydrogen evolution
Introduction Given the rapid growth of the world’s population and the increasing pursuit for a high quality of life, over-consumption of energy has resulted in the possibility that the rapidly growing energy demand will trigger an energy crisis. At the same time, a series of potential huge problems, such as the derived environmental pollution and ecological destruction, continuous increases in the global greenhouse gas emissions, the increased area of forest destruction, and
* Yanbing Li [email protected] * Qingxiang Ma [email protected] 1
State Key Laboratory of High‑Efficiency Utilization of Coal and Green Chemical Engineering, Ningxia University, Yinchuan 750021, China
Ningxia Key Laboratory of Solar Chemical Conversion Technology, Key Laboratory for Chemical Engineering and Technology, State Ethnic Affairs Commission, School of Chemistry and Chemical Engineering, North Minzu University, Yinchuan 750021, China
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the accumulating production of domestic waste, also exist. Thus, the catastrophic environmental pollution caused by the consumption and depletion of fossil fuels has been recognized as a major challenge in the near future [1]. The development of sustainable clean energy has become the most critical issue to solve the above problems [2, 3]. For instance, electrochemical synthesis of hydrogen peroxide (H2O2) provides a clean and safe technology for large-scale H2O2 production [4]. A novel method for synthesizing p-
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