Wenshuo Xie

Bio: Wenshuo Xie is an academic researcher from Shanghai Institute of Technology. The author has contributed to research in topics: Oxygen evolution & Bimetallic strip. The author has co-authored 3 publications.

Controllable tuning of polymetallic Co-Ni-Ru-S-Se ultrathin nanosheets to boost electrocatalytic oxygen evolution

Abstract: Abstract Replacing precious metals in oxygen evolution reaction (OER) catalysts has broad prospects to achieve a viable water splitting system. Since the electrocatalytic OER is a four-electron transfer reaction with a very sluggish kinetic process, there is great interest in the development of inexpensive, durable, and high-efficiency OER catalysts. Herein, trimetallic Co-Ni-Ru sulfoselenide and bimetallic sulfoselenide nanosheets were designed by regulating their composition and morphology for efficient and durable OER electrocatalysis. The sheet structure has a large specific surface area to promote contact between the catalyst and electrolyte. Compared with bimetallic Co-Ni, Co-Ru, Ni-Ru, Co-Cd, and Co-Au sulfoselenide nanosheets, trimetallic Co-Ni-Ru sulfoselenide nanosheets show superior OER performance. By modulating the composition ratio of metal atoms in the Co-Ni-Ru-S-Se nanosheets (1:1:0.5:1:1), the nanosheets showed a significant OER overpotential of η = 261 mV (1.491 V versus RHE) at 10 mA cm −2 , a Tafel slope of 52.2 mV dec –1 and outstanding stability after 48 h of continuous testing. For comparison, Co-Ni, Co-Ru, Ni-Ru, Co-Cd, and Co-Au bimetallic sulfoselenide nanosheets (denoted as Co-Ni-S-Se, Co-Ru-S-Se, Ni-Ru-S-Se, Co-Au-S-Se, Co-Cd-S-Se) were also tested. Density functional theory (DFT) calculations showed that appropriately doping Ru and Ni simultaneously (Co-Ni-Ru-S-Se) can increase the density of the states at the Fermi level, resulting in excellent charge density and low intermediate adsorption energy. These findings present a practical route to design 2D polymetallic nanosheets to optimize catalytic OER performance.

Controllable tuning of polymetallic Co-Ni-Ru-S-Se ultrathin nanosheets to boost electrocatalytic oxygen evolution

Abstract: Abstract Replacing precious metals in oxygen evolution reaction (OER) catalysts has broad prospects to achieve a viable water splitting system. Since the electrocatalytic OER is a four-electron transfer reaction with a very sluggish kinetic process, there is great interest in the development of inexpensive, durable, and high-efficiency OER catalysts. Herein, trimetallic Co-Ni-Ru sulfoselenide and bimetallic sulfoselenide nanosheets were designed by regulating their composition and morphology for efficient and durable OER electrocatalysis. The sheet structure has a large specific surface area to promote contact between the catalyst and electrolyte. Compared with bimetallic Co-Ni, Co-Ru, Ni-Ru, Co-Cd, and Co-Au sulfoselenide nanosheets, trimetallic Co-Ni-Ru sulfoselenide nanosheets show superior OER performance. By modulating the composition ratio of metal atoms in the Co-Ni-Ru-S-Se nanosheets (1:1:0.5:1:1), the nanosheets showed a significant OER overpotential of η = 261 mV (1.491 V versus RHE) at 10 mA cm −2 , a Tafel slope of 52.2 mV dec –1 and outstanding stability after 48 h of continuous testing. For comparison, Co-Ni, Co-Ru, Ni-Ru, Co-Cd, and Co-Au bimetallic sulfoselenide nanosheets (denoted as Co-Ni-S-Se, Co-Ru-S-Se, Ni-Ru-S-Se, Co-Au-S-Se, Co-Cd-S-Se) were also tested. Density functional theory (DFT) calculations showed that appropriately doping Ru and Ni simultaneously (Co-Ni-Ru-S-Se) can increase the density of the states at the Fermi level, resulting in excellent charge density and low intermediate adsorption energy. These findings present a practical route to design 2D polymetallic nanosheets to optimize catalytic OER performance.

Partial Selenium Surface Modulation of Metal Organic Framework Assisted Cobalt Sulfide Hollow Spheres for High Performance Bifunctional Oxygen Electrocatalysis and Rechargeable Zinc–Air Batteries

Abstract: There is still a significant technological barrier in the development of high-performance electrocatalysts with synergistic unreliable functions and morphological integrity that improves reversible electrochemical activity, electrical conductivity, and mass transport properties. Metal-organic compound networks are envisioned as a defect-rich porous framework that provides mesoporous hollow carbon nanostructures composed primarily of an in situ-grown N-doped graphitic carbon matrix and embedded selenium-doped CoS2 hollow spheres as efficient, highly reactive, and long-lasting chemical energy conversion functions of the system. This method enables hitherto inaccessible synthesis approaches to produce a highly porous conductive network at the microscopic level while exposing rich unsaturated reactive sites at the atomic level without losing electrical or structural integrity. Because of their inherent increased electrochemical surface area, and electron transfer, the porous framework, doping motifs, and tailored structural defects provide outstanding bifunctional oxygen electrocatalysts for both oxygen reduction reaction (ORR) and oxygen evolution reactions (OER). Moreover, using this selenium-doped MOF CoS2 hollow spheres electrode as an air-cathode, a rechargeable zinc-air battery with excellent discharge-charge performance and mechanical stability is successfully constructed. This study provides a feasible and universal technique for constructing diverse functional interconnected metal-organic coordinated compounds that may be employed for a wide variety of energy storage, conversion (e.g., fuel cells and metal-air batteries), and environmental applications.