The invention discloses a preparation method for porous carbon. The preparation method comprises the following steps: step (1): adding waste paper products to a reactor loaded with H2SO4 solution, placing the reactor in a high-pressure reaction kettle, in a temperature of 200-220 DEG C, reacting for 11-14 h, generating a material A; step (2): filtering the material A generated in the step (1), washing, drying, and grinding for future use; and step (3): enabling the material A grinded in the step (2) to mix with KOH, placing a mixture in a crucible for performing heat treatment, to obtain a powder material, grinding, washing, adjusting a pH value to 7, drying, to obtain the porous carbon. A carbon-selenium composite material is prepared by using the prepared porous carbon, and the carbon-selenium composite material is used for preparing the positive electrode. The electric conductive performance of the positive electrode can be improved by using the porous carbon, and the dissolution ofa selenide can be inhibited.

Porous carbon, carbon-selenium composite material and method for preparing battery positive electrode by using carbon-selenium composite material

The invention discloses a few-layer ReS2 nanosheet @ MoS2 quantum dot composite photocatalyst, and a preparation method thereof. The preparation method mainly comprises following steps: 1, ball milling is carried out to prepare ReS2; 2, ReS2 powder is dispersed in a solvent such as ethanl for ultrasonic peeling; 3, an obtained ultrasonic dispersed solution is subjected to centrifugalization, a product is collected, washed, and freeze-dried so as to obtain few-layer ReS2 nanosheet; 4, sodium molybdate dihydrate and dibenzyl disulfide are ultrasonically dispersed in deionized water and ethanol respectively, obtained two suspensions are introduced into an autoclave for hydrothermal treatment, and at last, an obtained corresponding product is subjected to centrifugalization to obtain MoS2QDs supernatant layer; and 5, the prepared MoS2QDs and the ReS2 nanosheet are subjected to second hydrothermal compounding so as to obtain the few-layer ReS2 nanosheet @ MoS2 quantum dot composite photocatalyst. The few-layer ReS2 nanosheet @ MoS2 quantum dot composite photocatalyst prepared through the preparation method is excellent in performance, simple in operation and high in application value.

Few-layer ReS2 nanosheet @ MoS2 quantum dot composite photocatalyst, and preparation method thereof

The invention discloses a carbon nanotube limited range selenium composite anode material and a preparation method thereof. In the composite anode material, elemental selenium nanoparticles are limited within a nano space of a one-dimensional limited range of carbon nanotubes at a mass ratio of (0.5-5.0):1. The preparation method comprises the following steps: (1) putting the carbon nanotubes intoa strong acid, stirring, and carrying out heating purification treatment to obtain purified carbon nanotubes; (2) grinding the purified carbon nanotubes obtained in the step (1) with selenium powder,sufficiently mixing, and carrying out low-temperature thermal treatment in a protective atmosphere to obtain the carbon nanotube limited range selenium composite anode material. The carbon nanotube limited range selenium composite anode material disclosed by the invention is capable of inhibiting volume expansion and a shuttling effect, and is high in discharge specific capacity and excellent inhigh magnification charge/discharge performance and circulation performance; and the method disclosed by the invention is simple in process, low in cost and suitable for industrial production.

Carbon nanotube limited range selenium composite anode material and preparation method thereof

The invention discloses a battery positive electrode material, a battery positive electrode and a lithium-selenium battery. The battery positive electrode material is prepared by method of (1) carrying out coordination reaction of Cu(ClO4)2*6H2O, 6-(2-benzimidazolyl)-2-picolinic acid and 4,4'-dipyridyl to obtain copper-based coordination polymer; 2) carrying out annealing treatment and acid etching treatment of the copper-based coordination polymer to obtain nitrogen-doped carbon; and 3) loading selenium powder on the nitrogen-doped carbon to obtain the battery positive electrode material. Themethod is advantaged in that the annealed and acid-etched copper coordination polymer is used as a carrier, selenium is loaded to obtain the battery positive electrode material, the battery positiveelectrode material has good conductivity and high electrochemical activity, the specific capacity and the cycling stability of the lithium-selenium battery can be improved, and the utilization rate ofselenium can also be improved.

Battery positive electrode material, battery positive electrode and lithium-selenium battery

The invention belongs to the technical field of lithium batteries, and discloses a lithium-selenium battery positive electrode material capable of reducing loss of polyselenide, an electrode plate anda button cell The positive electrode material of the lithium-selenium battery is prepared by the following steps of (1) preparing cobalt-containing porous carbon; (2) mixing elemental selenium withthe cobalt-containing porous carbon, heating and reacting in a protective atmosphere to obtain the positive electrode material, wherein the heating reaction temperature ranges from 200 DEG C to 300 DEG C The electrode plate is prepared from the positive electrode material The button cell comprises the electrode plate The mesoporous structure of the porous carbon matrix in the positive electrodematerial disclosed by the invention is connected in a staggered manner, so that the diffusion of electrons and ions is facilitated, and in addition, the volume expansion of selenium in the charging and discharging process can be reduced; and the positive electrode material can prevent the polyselenide from being dissolved, so that the loss of polyselenide is reduced; and the positive electrode material disclosed by the invention has excellent electrochemical performance

Lithium-selenium battery positive electrode material capable of reducing loss of polyselenide, electrode plate and button cell

The invention discloses a flower-like hierarchical nitrogen-doped porous carbon-selenium composite positive electrode material and a preparation method and application of such material. The flower-like hierarchical nitrogen-doped porous carbon-selenium composite positive electrode material prepared by a melt diffusion method can be sufficiently infiltrated by electrolyte and shorten an electron transmission route, and microporous and mesoporous structures can increase selenium load capacity and well restrict the selenium shuttle effect; macropores are beneficial to sufficient contact between the electrolyte and active substances and effectively enhance cycling stability and a capacity retention ratio of a composite electrode prepared from the material. The flower-like hierarchical nitrogen-doped porous carbon-selenium composite positive electrode material has the advantages of high specific capacity, good cycle performance and excellent rate capability, and the preparation method is simple, thereby being of great popularization and application significance.

Flower-like hierarchical nitrogen-doped porous carbon-selenium composite positive electrode material and preparation method and application of such material

The invention discloses a molybdenum disulfide quantum dot/copper-indium-sulfur composite photocatalyst for generating hydrogen from visible light. The composite photocatalyst is prepared by loading MoS2 quantum dots serving as a co-catalyst on a curd like CuInS2. According to the photocatalyst disclosed by the invention, by loading the MoS2 quantum dots on a curd like CuInS2 base material, the problems in photoelectron-hole combination and photocorrosion in a CuInS2 composite material can be inhibited to a certain degree, the photoabsorption efficiency and the photocatalytic hydrogen generation efficiency of the obtained composite material are effectively improved, the application range of the composite material is widened, and the problem that existing sulfide-based photocatalytic raw material often employs an expensive precious metal as a co-catalyst so as to improve the catalyst performance; the preparation method has the advantages of simplicity, wide source of raw materials and low cost and adaptability to popularization and application.

Molybdenum disulfide quantum dot/copper-indium-sulfur composite photocatalyst for generating hydrogen from visible light and preparation method of molybdenum disulfide quantum dot/copper-indium-sulfur composite photocatalyst

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Flower-like hierarchical nitrogen-doped porous carbon-selenium composite positive electrode material and preparation method and application of such material

Molybdenum disulfide quantum dot/copper-indium-sulfur composite photocatalyst for generating hydrogen from visible light and preparation method of molybdenum disulfide quantum dot/copper-indium-sulfur composite photocatalyst