Bi‐Functional Co/Al Modified 1T‐MoS₂/rGO Catalyst for Enhanced Uranium Extraction and Hydrogen Evolution Reaction in Seawater

Abstract

of uranium. [5] Therefore, research on the rapid and selective recovery of uranium element from seawater is of great impor tance for the sustainable development of the nuclear industry. [6][7][8] Currently, the common methods used to extract uranium from seawater include the adsorption, membrane separation, photocatalytic reduction, and electro chemical reduction. [9][10][11][12][13] Adsorption and membrane separation methods, as simple physical methods, have been studied a lot, but the efficiency of uranium extraction is low and more influenced by various complex factors in seawater. [14][15][16] Photo catalytic reduction is a lowcost, non polluting method but it is less efficient and requires posttreatment to separate uraniumcontaining precipitates from the electrode material after electrical extrac tion. [17][18][19] Electrochemical reduction has a high efficiency in uranium extraction. [20,21] However, posttreatment is required after electrical extraction as photocatalytic reduction. [22,23] Therefore, it is an urgent need to develop a simple and effective uranium extraction method.Recently, an electrochemical uranium extraction technique has been proposed to achieve high efficiency uranium extrac tion performance through pH changes around the electrode caused by HER. For example, Wang at al. have proved that a functionalized reduced graphene oxide foam is used as a HER catalyst material to achieve high uranium extraction perfor mance. [24] However, its HER performance is still low, leading to an insufficient uranium extraction performance, and post treatment is required after electrical extraction. Therefore, it is critical to design and develop a highperformance HER catalyst for rapid extraction and recovery of uranium from seawater. It is worth noting that MoS 2 has been widely used as HER catalyst due to its moderate hydrogen adsorption free energy. However, the practical application of MoS 2 in electrocatalysis is hindered by its weak conductivity. [25][26][27] In comparison, reduced gra phene oxide (rhas high charge mobility and large surface area, being effectively used in functional composites as an ideal sup port component. Combining MoS 2 with rGO substrates could enhance the charge transfer between MoS 2 . [28,29] At the same time, modification of various metals has also been used to improve the electrocatalytic activity in MoS 2 . [30][31][32] Compared to Uranium is a key element in the preparation of nuclear fuel. An electrochemical uranium extraction technique is proposed to achieve high efficiency uranium extraction performance through HER catalyst. However, it is still a challenge to design and develop a high-performance hydrogen evolution reaction (HER) catalyst for rapid extraction and recovery of uranium from seawater. Herein, a bi-functional Co, Al modified 1T-MoS 2 /reduced graphene oxide (CA-1T-MoS 2 /rGO) catalyst, showing a good HER performance with a HER overpotential of 466 mV at 10 mA cm −2 in simulated seawater, is first developed. Benefiting from the high HER performance of CA-1T-...

Recent Advancements in Electrochemical Hydrogen Production via Hybrid Water Splitting

“…Aside from that, some similar electrolysis systems for both H 2 production and resource reclamation have also been reported. [215,216] For example, Wu and co-workers currently proposed an electrochemical H 2 production combined with a uranium extraction technique in seawater, and this process could obtain the UO 2 (OH) 2 precipitation at the cathode side due to pH changes around the electrode caused by HER, which is different from the above mentioned HWS. [216] The detailed performance of the integrated electrolysis systems for the solid phase oxidation products and H 2 productions has been summarized in Table 4.…”

A strategy for the preparation of super-hydrophilic molybdenum disulfide composites applied to remove uranium from wastewater

“…In recent years, methods have been proposed to treat uranium-containing wastewater, including photocatalytic reduction, chemical precipitation, evaporation and concentration, ion exchange, electrochemistry, membrane treatment and adsorption. [1][2][3][4] Among them, the adsorption method is considered to be one of the most effective methods because of its simple operation, environmental friendliness and high efficiency. 5,6 At present, various adsorbents including carbon materials, 7,8 MOFs, [9][10][11] LDH, [12][13][14][15][16] etc.…”

Unveiling the Critical Role of Surface Hydroxyl Groups for Electro-Assisted Uranium Extraction from Wastewater

“…Electrode materials with high conductivity and abundant active centers are the keys to achieving efficient electrochemical uranium extraction. Transition-metal oxides are considered ideal candidate electrode materials for electro-assisted uranium extraction due to their low cost, high electrical activity, and good stability. , In fact, transition-metal oxide electrode materials require both coordination sites that bind to uranyl ions and active centers for electrochemical reduction, enabling the efficient coordination and reduction of uranyl ions in aqueous solutions. − However, the uranium coordination sites on traditional electrode materials are separated from the active centers of electrochemical reduction in physical space. The efficiency of electro-assisted uranium extraction is greatly limited by the loss of electrons transferred from the active center to the coordination site.…”