Zhang Zhiliang

Bio: Zhang Zhiliang is an academic researcher from Central South University. The author has contributed to research in topics: Oxygen evolution & Catalysis. The author has an hindex of 3, co-authored 7 publications receiving 21 citations.

Oxygen evolution ferrocobalt-cobalt ferrite/nitrogen-doped nano-carbon tube composite catalyst and preparation method and application thereof

Abstract: The invention discloses an oxygen evolution ferrocobalt-cobalt ferrite/nitrogen-doped nano-carbon tube composite catalyst and a preparation method and application thereof. The oxygen evolution ferrocobalt-cobalt ferrite/nitrogen doped nano-carbon tube composite catalyst is prepared from CoFe-CoFe2O4 granules and nitrogen-doped nano-carbon tubes in a composited mode. The preparation method of the oxygen evolution ferrocobalt-cobalt ferrite/nitrogen doped nano-carbon tube composite catalyst comprises the following steps that a cobalt salt solution and a 2-methylimidazole solution are mixed and react, and thus metal-organic frameworks ZIF-67 are obtained; the metal-organic frameworks ZIF-67 are dispersed into a mixed solution containing ferric salt and dicyandiamide, and after a stirring reaction, a solvent is evaporated to obtain a precursor, and the precursor is subjected to heat treatment, and thus the CoFe-CoFe2O4/N-CNTs composite catalyst is obtained. The preparation method is simpleand low in cost, and is beneficial to industrial production; the prepared CoFe-CoFe2O4/N-CNTs composite catalyst is applied to storage and conversion systems for renewable energy such as water or metal-air electrocatalytic decomposition secondary cells, the comprehensive performance of the CoFe-CoFe2O4/N-CNTs composite catalyst is close to that of a RuO2 commercial catalyst, and the CoFe-CoFe2O4/N-CNTs composite catalyst has good application prospects.

High-performance oxygen-evolution CoSn2/Ni3Sn4@NC/C composite catalyst and preparation method and application thereof

Abstract: The invention discloses a high-performance oxygen-evolution CoSn2/Ni3Sn4@NC/C composite catalyst and a preparation method and application thereof. The composite catalyst is prepared in the step that cobalt-nickel selenide nano-particles and nitrogen-doped carbon are supported on a carbon material together. The preparation method comprises the steps that after a nitrogen-containing small organic molecule compound, cobalt salt and nickel salt are subjected to liquid mixing, a solvent is evaporated, drying is conducted, the mixture of the nitrogen-containing small organic molecule compound, the cobalt salt and the nickel salt is subjected to first calcination in a protective atmosphere, a calcined product and a carbon material are uniformly stirred in a dimethylformamide-water mixed solutionand then subjected to a solvothermal reaction, and a product obtained after the solvothermal reaction is subjected to second calcination in a protective atmosphere to obtain the high-performance oxygen-evolution CoSn2/Ni3Sn4@NC/C composite catalyst. The preparation technology is simple, low in cost and beneficial for industrial production; when used in a storage and conversion system of renewableenergy sources, such as water splitting or metal-air secondary batteries, the composite catalyst prepared by using the method has the advantages of being high in activity and high in stability; compared with a commercial RuO2 catalyst, the high-performance oxygen-evolution CoSn2/Ni3Sn4@NC/C composite catalyst is higher in combination property and shows a good application prospect.

Hierarchically constructed Ag nanowires shelled with ultrathin Co-LDH nanosheets for advanced oxygen evolution reaction

Abstract: It is highly desirable to cut down the electron transfer resistance, improve both site activity and site populations of layered double hydroxides (LDHs) for enhanced electrochemical activity of oxygen evolution reaction (OER). Herein, the hybrid that Co-LDH nanosheets shells grown on Ag nanowires (NWs) cores (Ag@Co-LDH) was constructed and applied as a favorable OER electrocatalyst. The high conductivity of Ag NWs and heterointerface between Ag NWs and Co-LDH gravely accelerate electron transfer. Co-LDH with ultrathin sheet-like structure and abundant grain boundary defects effectively provide lots of active sites. The optimized local environment of Co atoms by Ag dopants and plentiful amorphous regions strongly enhance the intrinsic activity of active site. Therefore, the as-prepared Ag@Co-LDH demonstrates distinguished OER activity with a low overpotential of 217 mV at the current density of 10 mA cm−2, which is superior to most reported advanced OER electrocatalysts and even commercial Ir/C. Moreover, benefiting from the unique structure and stable heterointerface, Ag@Co-LDH also exhibits robust cycling stability and long-term durability proved by accelerated degradation test (ADT) and galvanostatic test, respectively. This finding provides a practical design direction for high-performance LDH-based OER electrocatalysts.

Controllable synthesis and phase-dependent catalytic performance of dual-phase nickel selenides on Ni foam for overall water splitting

Abstract: NiSe2/Ni3Se4 dual-phase electrocatalysts are synthesized by calcining the Ni(OH)2 nanosheets on Ni foam and Se powder under an N2 atmosphere. The Ni’s charge-state, phase compositions, and electrocatalytic performances are dependent on the initial mass ratios of Ni to Se. The experimental results demonstrate that the electrocatalyst with a higher Ni charge-state and more Ni3Se4 phase facilitates oxygen evolution reaction (OER), whereas the one with a lower Ni charge-state and more NiSe2 phase boosts hydrogen evolution reaction (HER). Density functional theory calculations reveal that the interfacial electrons transfer from Ni3Se4 to NiSe2, which improves conductivity and optimizes adsorption/desorption energies. NiSe2/Ni3Se4/NF-4 containing more NiSe2 phase displays the best HER activity while NiSe2/Ni3Se4/NF-1 containing more Ni3Se4 phase shows the best HER activity. The electrolyzer, employing NiSe2/Ni3Se4/NF-4 and NiSe2/Ni3Se4/NF-1 as the cathode and anode, respectively, performs the full potential and demonstrates a low voltage of 1.56 V achieving 10 mA cm-2 with good durability.

Controllable synthesis and phase-dependent catalytic performance of dual-phase nickel selenides on Ni foam for overall water splitting

Abstract: NiSe2/Ni3Se4 dual-phase electrocatalysts are synthesized by calcining the Ni(OH)2 nanosheets on Ni foam and Se powder under an N2 atmosphere. The Ni’s charge-state, phase compositions, and electrocatalytic performances are dependent on the initial mass ratios of Ni to Se. The experimental results demonstrate that the electrocatalyst with a higher Ni charge-state and more Ni3Se4 phase facilitates oxygen evolution reaction (OER), whereas the one with a lower Ni charge-state and more NiSe2 phase boosts hydrogen evolution reaction (HER). Density functional theory calculations reveal that the interfacial electrons transfer from Ni3Se4 to NiSe2, which improves conductivity and optimizes adsorption/desorption energies. NiSe2/Ni3Se4/NF-4 containing more NiSe2 phase displays the best HER activity while NiSe2/Ni3Se4/NF-1 containing more Ni3Se4 phase shows the best HER activity. The electrolyzer, employing NiSe2/Ni3Se4/NF-4 and NiSe2/Ni3Se4/NF-1 as the cathode and anode, respectively, performs the full potential and demonstrates a low voltage of 1.56 V achieving 10 mA cm−2 with good durability.