| 1. |
- Deng, Xuefan, et al.
(författare)
-
A new strategy for boron cluster-based metal boride (Co2B) synthesis and its applicability to electrocatalytic nitrate reduction
- 2024
-
Ingår i: Chemical Engineering Journal. - : Elsevier. - 1385-8947 .- 1873-3212. ; 485
-
Tidskriftsartikel (refereegranskat)abstract
- To achieve efficient conversion of nitrate to ammonia, it is necessary to design and develop electrode materials with high activity and efficiency for the electrocatalytic reduction reaction of nitrate (NO3RR). Due to its unique semi-metallic properties, the vacancy orbitals of boron are prone to accommodate electrons, so doping element B with transition metals is expected to change the local electronic configuration of the metal, which in turn affects the corresponding catalytic reaction. Here, we propose a new strategy for the preparation of metal borides by using dodecahydro-closo-dodecaborate and Co2+ complexed and calcined to prepare a novel metal boride-Co2B for electrocatalytic nitrate reduction. This modification considerably enhances the performance of NO3RR. Co2B exhibited a Faradaic efficiency of NH4+ (FENH4+) as high as 96.61 % at -0.5 V vs. RHE, achieving a remarkable NH4+ yield of 5.73 mg h-1 mgcat - 1. This study provides a new approach for designing catalysts for environmentallyfriendly ammonia synthesis.
|
|
| 2. |
- Wang, Zhengxi, et al.
(författare)
-
Platinum group nanoparticles doped BCN matrix : Efficient catalysts for the electrocatalytic reduction of nitrate to ammonia
- 2024
-
Ingår i: Journal of Colloid and Interface Science. - : Elsevier. - 0021-9797 .- 1095-7103. ; 664, s. 84-95
-
Tidskriftsartikel (refereegranskat)abstract
- The effective treatment of nitrate (NO3- ) in water as a nitrogen source and electrocatalytic NO3- reduction to ammonia (NH3 ) (NRA) have become preferred methods for NO3--to-NH3 conversion. Achieving efficient NO3--to-NH3 conversion requires the design and development of electrode materials with high activity and efficiency for the electrocatalytic NRA reaction. Herein, based on the special properties of dodecahydro- closo -dodecaborate anions, a BCN matrix, loaded with platinum -group nanoparticles (namely, Pd/BCN, Pt/BCN, and Ru/BCN), was prepared using a simple method for the electrocatalytic NRA reaction. Results showed that Pd/BCN exerts the best catalytic effect on the NRA reaction. The NH3 production rate reached 12.71 mg h- mgcat.-1 at -1.0 V vs. RHE. Faraday efficiency reached 91.79 %, which can be attributed to the more uniform distribution of the nanoparticles. Furthermore, Pd/BCN exhibited high cycling stability and resistance to ionic interference. Moreover, the density functional theory calculations indicated that small and well -distributed Pd nanoclusters in the BCN matrix have a large active surface area and promote the catalytic process. This study provides a new strategy to design catalysts for green ammonia synthesis.
|
|
| 3. |
- Xu, Xiaoran, et al.
(författare)
-
Applications of Boron Cluster Supramolecular Frameworks as Metal-Free Chemodynamic Therapy Agents for Melanoma
- 2024
-
Ingår i: Small. - : John Wiley & Sons. - 1613-6810 .- 1613-6829. ; 20:4
-
Tidskriftsartikel (refereegranskat)abstract
- Chemodynamic therapy (CDT) is a highly targeted approach to treat cancer since it converts hydrogen peroxide into harmful hydroxyl radicals (OH & BULL;) through Fenton or Fenton-like reactions. However, the systemic toxicity of metal-based CDT agents has limited their clinical applications. Herein, a metal-free CDT agent: 2,4,6-tri(4-pyridyl)-1,3,5-triazine (TPT)/ [closo-B12H12]2-(TPT@ B12H12) is reported. Compared to the traditional metal-based CDT agents, TPT@B12H12 is free of metal avoiding cumulative toxicity during long-term therapy. Density functional theory (DFT) calculation revealed that TPT@B12H12 decreased the activation barrier more than 3.5 times being a more effective catalyst than the Fe2+ ion (the Fenton reaction), which decreases the barrier about twice. Mechanismly, the theory calculation indicated that both [B12H12]-& BULL; and [TPT-H]2+ have the capacity to decompose hydrogen into 1O2, OH & BULL;, and O2-& BULL;. With electron paramagnetic resonance and fluorescent probes, it is confirmed that TPT@B12H12 increases the levels of 1O2, OH & BULL;, and O2-& BULL;. More importantly, TPT@B12H12 effectively suppress the melanoma growth both in vitro and in vivo through 1O2, OH & BULL;, and O2-& BULL; generation. This study specifically highlights the great clinical translational potential of TPT@B12H12 as a CDT reagent. 2,4,6-Tri(4-pyridyl)-1,3,5-triazine (TPT)/ [closo-B12H12]2-(TPT@B12H12), a metal-free chemodynamic therapy (CDT) agent, decreases the activation barrier more than 3.5 times being a more effective catalyst than the Fe2+ ion (the Fenton reaction), which decreases the barrier about twice. More importantly, TPT@B12H12 effectively suppress the melanoma growth both in vitro and in vivo through 1O2, OH & BULL;, and O2-& BULL; generation. image
|
|
| 4. |
- Xu, Xiaoran, et al.
(författare)
-
Synthesis of iron-boride/carbon-nitride composites and their applications in chemodynamic therapy
- 2024
-
Ingår i: Journal of Colloid and Interface Science. - : Elsevier. - 0021-9797 .- 1095-7103. ; 658, s. 276-285
-
Tidskriftsartikel (refereegranskat)abstract
- Chemodynamic therapy (CDT) is an emerging treatment strategy that inhibits tumor growth by catalyzing the generation of reactive oxygen species (ROS), such as hydroxyl radicals (center dot OH), using specific nanomaterials. Herein, we have developed a new class of iron-based nanomaterials, i.e., iron-based borides (FeB), using the superchaotropic effect of a boron cluster (closo-[B12H1212-) and organic ligands, followed by high-temperature calcination. Experimental data and theoretical calculations revealed that FeB nanoparticles exhibit a Fentonlike effect, efficiently decomposing hydrogen peroxide into center dot OH and thus increasing the concentration of ROS. FeB nanomaterials demonstrate excellent catalytic performance, efficiently generate ROS, and exert significant antitumor effects in cell experiments and animal models. Therefore, FeB nanomaterials have
|
|
