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Electro-catalysis oxygen reduction catalyst based on boron-nitrogen co-doped nano-diamond

A nano-diamond and co-doping technology is applied in the field of electrochemistry to achieve the effects of rich content, easy large-scale application, and improved electrocatalytic activity

Active Publication Date: 2013-09-25
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the catalytic efficiency and stability of these catalysts need to be further improved.

Method used

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  • Electro-catalysis oxygen reduction catalyst based on boron-nitrogen co-doped nano-diamond
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  • Electro-catalysis oxygen reduction catalyst based on boron-nitrogen co-doped nano-diamond

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Embodiment 1

[0021] Example 1, boron nitrogen co-doped nano-diamond electrocatalytic oxygen reduction activity

[0022] Using boron-nitrogen co-doped nano-diamond as the working electrode, Pt as the counter electrode, and a saturated calomel electrode as the reference electrode, in O 2 The linear voltammetry curve was measured at 1800 rpm in saturated 0.1M KOH. The preparation parameters of boron-nitrogen co-doped nano-diamonds are: CH 4 The volume fraction is 1.5%, N 2 Volume fraction 1.3%, B 2 h 6 The concentration is 10000ppm, the pressure is 5.5KPa, and the deposition is at 550°C for 6h. attached by figure 2 It can be seen that the onset voltage of oxygen reduction of boron-nitrogen co-doped nanodiamond is -0.04V, which is close to that of the commercial Pt / C catalyst (0.01V). At 1800rpm, its current density is 5.12mA.cm at -0.40V -2 , which can be compared to the commercial Pt / C catalyst (5.25mA.cm -2 ). This indicates that boron-nitrogen co-doped nanodiamond is a highly act...

Embodiment 2

[0023] Example 2, boron and nitrogen co-doped nano-diamond electrocatalytic oxygen reduction efficiency

[0024] Using boron-nitrogen co-doped nano-diamond as the working electrode, Pt as the counter electrode, and a saturated calomel electrode as the reference electrode, in O 2 The linear voltammetry curves at different rotational speeds were measured in saturated 0.1M KOH, and the electron transfer number of the oxygen reduction reaction was calculated according to the corresponding Koutechy-Levich curves. The preparation parameters of boron-nitrogen co-doped nano-diamonds are: CH 4 The volume fraction is 0.8%, N 2 Volume fraction 0.5%, B 2 h 6 The concentration is 15000ppm, the pressure is 4.3KPa, and the deposition is at 450°C for 18h. attached by image 3 It can be seen that the electron transfer number of oxygen reduction of boron-nitrogen co-doped nano-diamonds is 3.95, indicating that boron-nitrogen co-doped nano-diamonds can efficiently proceed in accordance with...

Embodiment 3

[0025] Example 3, boron nitrogen co-doped nano-diamond electrocatalytic oxygen reduction stability

[0026] Using boron-nitrogen co-doped nano-diamond as the working electrode, Pt as the counter electrode, and a saturated calomel electrode as the reference electrode, at -0.3V, O 2 Current-time curve measured in saturated 0.1M KOH. The preparation parameters of boron-nitrogen co-doped nano-diamonds are: CH 4 The volume fraction is 2.5%, N 2 Volume fraction 0.8%, B 2 h 6 The concentration is 20000ppm, the pressure is 7.5KPa, and the deposition is at 500°C for 12h. attached by Figure 4 It can be seen that the oxygen reduction current of boron-nitrogen co-doped nano-diamond is relatively stable, and the current only drops by 6.0% after a long-term operation of 20000s, which is significantly higher than the stability of commercial Pt / C catalysts.

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Abstract

The invention belongs to the field of electrochemistry and relates to an electro-catalysis oxygen reduction catalyst based on boron-nitrogen co-doped nano-diamond, and the nano-diamond contains 0-5% of nitrogen and 0-5% of boron. The boron-nitrogen co-doped nano-diamond disclosed by the invention can use B2H6, N2, H2 and CH4 to deposit for 6-20h for preparation through a plasma chemical vapor deposition method under the conditions that the temperature is 420-600 DEG C, the pressure is 4-8kPa, the volume fractions of N2 and CH4 are 0.5-2.5% and 0.8-3% respectively, and the concentration of B2H6 is 5000-25000ppm. The boron-nitrogen co-doped nano-diamond has the advantages of high electro-catalysis activity, good stability and the like against oxygen reduction reaction, is a non-metal oxygen reduction material with good performance and low cost, and can be widely applied to fuel cells, metal-air cells, corrosion resistance and biological sensing.

Description

technical field [0001] The invention belongs to the technical field of electrochemistry, and relates to an electrocatalytic oxygen reduction catalyst based on boron-nitrogen co-doped nano-diamond. Background technique [0002] Oxygen reduction reaction is an important reaction in the fields of energy conversion (fuel cells and metal-air batteries), corrosion protection and biosensing, and has received extensive attention and research in recent years. There are two main pathways for the oxygen reduction reaction: (1) Two-electron reaction O 2 +H 2 O+2e - →HO 2 - +OH - ;(2) four-electron reaction O 2 +H 2 O+4e - →4OH - . For fuel cells and metal-air batteries, electrocatalytic efficiency is higher when the cathodic oxygen reduction reacts in a four-electron pathway. The slow rate and low efficiency of the current oxygen reduction reaction are the main factors limiting its application, and the key to solving this problem is to develop an efficient electrocatalytic ox...

Claims

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Application Information

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IPC IPC(8): B01J21/18H01M4/90
CPCY02E60/50
Inventor 全燮刘艳明陈硕于洪涛张耀斌赵慧敏
Owner DALIAN UNIV OF TECH
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