<strong>Mn</strong>掺杂<strong>Co-Al</strong>金属氢氧化物的制备及其全解水电化学性能

doi:10.11901/1005.3093.2021.258

材料研究学报

2022, Vol. 36

Issue (2): 140-146 DOI: 10.11901/1005.3093.2021.258

研究论文

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Mn掺杂Co-Al金属氢氧化物的制备及其全解水电化学性能

嵇锦鹏¹, 李国辉¹^,²(

), 耿凤霞¹

^1.苏州大学能源学院苏州 2151232
^2.遵义师范学院化学化工学院遵义 563006

Mn-doped Co-Al LDHs and its Potential Use for Overall Water Splitting

JI Jinpeng¹, LI Guohui¹^,²(

), GENG Fengxia¹

^1.College of Energy, Soochow University, Suzhou 215123, China
^2.School of Chemistry and Chemical Engineering, Zunyi Normal University, Zunyi 563006, China

引用本文:

嵇锦鹏, 李国辉, 耿凤霞. Mn掺杂Co-Al金属氢氧化物的制备及其全解水电化学性能[J]. 材料研究学报, 2022, 36(2): 140-146.
Jinpeng JI, Guohui LI, Fengxia GENG. Mn-doped Co-Al LDHs and its Potential Use for Overall Water Splitting[J]. Chinese Journal of Materials Research, 2022, 36(2): 140-146.

全文: PDF(7453 KB) HTML

摘要:

以Co基氢氧化物为基础用异质元素掺杂方式引入Mn并与Co协同，制备出Mn掺杂Co-Al层状双金属氢氧化物 (Mn-CoAl LDH)。在1 mol/L的KOH碱性电解质中，电流密度达到10 mA·cm^-2时Mn-CoAl LDH的全解水电势为1.66 V，其性能远优于Co-Al层状双金属氢氧化物(CoAl LDH)、Ni_2/3S_1/3/Nickel Foam (1.76 V)和已经商业化的Pt/C (1.75 V)。这表明，Mn-CoAl LDH催化剂在碱性环境下具有较高的析氢和析氧活性，是一种低成本高性能的双功能电催化剂。

关键词 ：无机非金属材料, 催化剂, Mn掺杂, 析氢, 析氧

Abstract：

The layered double-metal Co-Al hydroxide (CoAl LDH) was first prepared via reflux precipitation method with CoCl₂·6H₂O and AlCl₃·6H₂O as raw material, and then the heteroelement Mn doped layered double-metal Co-Al hydroxide (Mn-CoAl LDH) was acquired by the same means. When the current density reaches 10 mA·cm^-2, the fully hydrolyzable potential of Mn-CoAl LDH in 1 mol/L KOH alkaline electrolyte is 1.66 V, its performance is much better than that of undoped Co-Al layered bimetallic hydroxide (CoAl LDH), Ni_2/3S_1/3 /Nickel Foam (1.76 V) and commercial Pt/C (1.75 V). These results show that Mn-CoAl LDH catalyst has high activity of hydrogen evolution and oxygen evolution in alkaline environment, and is a kind of low cost and high performance bifunctional electric catalyst

Key words： inorganic non-metallic materials catalyst Mn doping hydrogen production oxygen evolution

收稿日期: 2021-04-21

ZTFLH:

TQ116.2

基金资助:国家自然科学基金(51772201);贵州省材料电化学特色重点实验室项目(黔教合KY字［2018］004);博士基金(遵师BS［2020］13)

作者简介: 李国辉，副教授，lgh101812@163.com，研究方向为功能性层状材料和能源材料
嵇锦鹏，男，1996年，硕士生

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https://www.cjmr.org/CN/10.11901/1005.3093.2021.258 或 https://www.cjmr.org/CN/Y2022/V36/I2/140

图1 CoAl LDH和Mn-CoAl LDH的XRD谱

图2 CoAl LDH的扫描电镜照片

图3 Mn-CoAl LDH的扫描电镜照片

表1 样品金属成分的原子比

图4 Mn-CoAl LDH的SEM照片和相应的EDX元素分布

图5 在1 mol/L KOH水溶液中Mn-CoAl LDH等的析氢性能

图6 在1 mol/L KOH水溶液中Mn-CoAl LDH等的析氧性能

图7 扫速不同(2~10 mV·s -1)的循环伏安曲线

图8 Mn-CoAl LDH催化剂的全解水性能

表2 与一些非贵金属全解水催化活性的比较

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