CN110479301A - 一种二氧化锰/钙钛矿氧化物复合催化剂的制备和性能研究的方法 - Google Patents
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- 239000011572 manganese Substances 0.000 description 26
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 7
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Abstract
本发明公开了一种α‑MnO2/La0.4Sr0.6Co0.8Mn0.2O3复合催化剂的制备和性能研究的方法。通过溶胶‑凝胶法用一定比例的金属硝酸盐,加入一定量的一水合柠檬酸进行加热搅拌混合,形成溶胶后通过干燥转变成凝胶,在一定的温度下煅烧就得到钙钛矿型氧化物La0.4Sr0.6Co0.8Mn0.2O3;将称量好的0.225g KMnO4固体加入到20mL去离子水中溶解,再加入37%HCl溶液0.5mL,搅拌30min后将所得混合物倒进25mL的高压釜中。随后将其在140℃下干燥12h,将所得产物取出并用无水乙醇和去离子水洗涤数次。最后将产物在60℃下干燥24h得到MnO2。将La0.4Sr0.6Co0.8Mn0.2O3与α‑MnO2按比例1:4,2:3,3:2,4:1,1:0均匀混合,即实现利用α‑MnO2改性钙钛矿型氧化物La0.4Sr0.6Co0.8Mn0.2O3。本发明工艺条件简单,容易制备。
Description
技术领域
本发明属于材料化学以及电化学研究领域,特别涉及一种α-MnO2/La0.4Sr0.6Co0.8Mn0.2O3复合催化剂的制备和性能研究的方法。
背景技术
钙钛矿型氧化物在碱性溶液中比较稳定、室温下有较高的电子导电性、具有顺磁性及氧缺陷等优点,它作为氧电极的电催化材料是极具发展优势的。而钙钛矿氧化物由于其特有的结构和功能,与二氧化锰复合作为催化剂可以同时具备较好的稳定性和催化活性。本发明实现利用α-MnO2改性钙钛矿型氧化物La0.4Sr0.6Co0.8Mn0.2O3使其具有更好的催化活性,是一种新型有效的方法。
发明内容
本发明的目的是提供一种α-MnO2/La0.4Sr0.6Co0.8Mn0.2O3复合催化剂的制备和性能研究的方法。
本发明的思路:利用α-MnO2改性钙钛矿型氧化物La0.4Sr0.6Co0.8Mn0.2O3,将其作为催化剂应用于氧电极,以提高氧电极的电化学性能。
具体步骤为:
(1)用一定比例的金属硝酸盐,加入一定量的一水合柠檬酸进行加热搅拌混合,形成溶胶后通过干燥箱转变成凝胶,在一定的温度下煅烧就可得到钙钛矿型氧化物La0.4Sr0.6Co0.8Mn0.2O3;
(2)将称量好的0.225g KMnO4固体加入到20mL去离子水中溶解,再加入37%HCl溶液0.5mL,搅拌30min后将所得混合物倒进25mL的高压釜中。随后将其放进140℃的干燥箱内12h,接着将所得产物用无水乙醇和去离子水洗涤数次。最后将产物在60℃下干燥24h得到α-MnO2;
(3)将La0.4Sr0.6Co0.8Mn0.2O3与α-MnO2按比例1:4,2:3,3:2,4:1,1:0均匀混合,即实现利用α-MnO2改性钙钛矿型氧化物La0.4Sr0.6Co0.8Mn0.2O3。
本发明利用α-MnO2作为钙钛矿氧化物的改性剂,进而提高钙钛矿氧化物催化氧电极的性能。
具体实施方式
实施例1:
(1)用一定比例的金属硝酸盐,加入一定量的一水合柠檬酸进行加热搅拌混合,形成溶胶后通过干燥箱转变成凝胶,在一定的温度下煅烧就可得到钙钛矿型氧化物La0.4Sr0.6Co0.8Mn0.2O3;
(2)将称量好的0.225g KMnO4固体加入到20mL去离子水中溶解,再加入37%HCl溶液0.5mL,搅拌30min后将所得混合物倒进25mL的高压釜中。随后将其放进140℃的干燥箱内12h,接着将所得产物用无水乙醇和去离子水洗涤数次。最后将产物在60℃下干燥24h得到α-MnO2;
(3)将La0.4Sr0.6Co0.8Mn0.2O3与α-MnO2按比例1:4均匀混合,即实现利用α-MnO2改性钙钛矿型氧化物La0.4Sr0.6Co0.8Mn0.2O3。
实施例2:
(1)用一定比例的金属硝酸盐,加入一定量的一水合柠檬酸进行加热搅拌混合,形成溶胶后通过干燥箱转变成凝胶,在一定的温度下煅烧就可得到钙钛矿型氧化物La0.4Sr0.6Co0.8Mn0.2O3;
(2)将称量好的0.225g KMnO4固体加入到20mL去离子水中溶解,再加入37%HCl溶液0.5mL,搅拌30min后将所得混合物倒进25mL的高压釜中。随后将其放进140℃的干燥箱内12h,接着将所得产物用无水乙醇和去离子水洗涤数次。最后将产物在60℃下干燥24h得到α-MnO2;
(3)将La0.4Sr0.6Co0.8Mn0.2O3与α-MnO2按比例2:3均匀混合,即实现利用α-MnO2改性钙钛矿型氧化物La0.4Sr0.6Co0.8Mn0.2O3。
实施例3:
(1)用一定比例的金属硝酸盐,加入一定量的一水合柠檬酸进行加热搅拌混合,形成溶胶后通过干燥箱转变成凝胶,在一定的温度下煅烧就可得到钙钛矿型氧化物La0.4Sr0.6Co0.8Mn0.2O3;
(2)将称量好的0.225g KMnO4固体加入到20mL去离子水中溶解,再加入37%HCl溶液0.5mL,搅拌30min后将所得混合物倒进25mL的高压釜中。随后将其放进140℃的干燥箱内12h,接着将所得产物用无水乙醇和去离子水洗涤数次。最后将产物在60℃下干燥24h得到α-MnO2;
(3)将La0.4Sr0.6Co0.8Mn0.2O3与α-MnO2按比例3:2均匀混合,即实现利用α-MnO2改性钙钛矿型氧化物La0.4Sr0.6Co0.8Mn0.2O3。
实施例4:
(1)用一定比例的金属硝酸盐,加入一定量的一水合柠檬酸进行加热搅拌混合,形成溶胶后通过干燥箱转变成凝胶,在一定的温度下煅烧就可得到钙钛矿型氧化物La0.4Sr0.6Co0.8Mn0.2O3;
(2)将称量好的0.225g KMnO4固体加入到20mL去离子水中溶解,再加入37%HCl溶液0.5mL,搅拌30min后将所得混合物倒进25mL的高压釜中。随后将其放进140℃的干燥箱内12h,接着将所得产物用无水乙醇和去离子水洗涤数次。最后将产物在60℃下干燥24h得到α-MnO2;
(3)将La0.4Sr0.6Co0.8Mn0.2O3与α-MnO2按比例4:1均匀混合,即实现利用α-MnO2改性钙钛矿型氧化物La0.4Sr0.6Co0.8Mn0.2O3。
实施例5:
(1)用一定比例的金属硝酸盐,加入一定量的一水合柠檬酸进行加热搅拌混合,形成溶胶后通过干燥箱转变成凝胶,在一定的温度下煅烧就可得到钙钛矿型氧化物La0.4Sr0.6Co0.8Mn0.2O3;
(2)将称量好的0.225g KMnO4固体加入到20mL去离子水中溶解,再加入37%HCl溶液0.5mL,搅拌30min后将所得混合物倒进25mL的高压釜中。随后将其放进140℃的干燥箱内12h,接着将所得产物用无水乙醇和去离子水洗涤数次。最后将产物在60℃下干燥24h得到α-MnO2;
(3)将La0.4Sr0.6Co0.8Mn0.2O3与α-MnO2按比例1:0均匀混合,即实现利用α-MnO2改性钙钛矿型氧化物La0.4Sr0.6Co0.8Mn0.2O3。
利用CHI660E电化学工作站对α-MnO2改性的钙钛矿型氧化物进行测试,结果如下:
(1)La0.4Sr0.6Co0.8Mn0.2O3与α-MnO2的比例依次为1:4、2:3、3:2、4:1、1:0时,催化的氧电极的阳极极化曲线的电流密度依次为0.1987Acm-2、0.2787A m-2、0.268A cm-2、0.2236Acm-2、0.2556A cm-2;阴极极化曲线的电流密度依次为0.195Acm-2、0.2531Acm-2、0.2447Acm-2、0.2044A cm-2、0.2288A cm-2。
(2)钙钛矿氧化物La0.4Sr0.6Co0.8Mn0.2O3与α-MnO2的比例为2:3时催化的氧电极阴阳极化曲线的电流密度最大,表明钙钛矿型氧化物La0.4Sr0.6Co0.8Mn0.2O3的催化活性最好。
上述实例考察不同比例的α-MnO2对钙钛矿氧化物电极的影响,当钙钛矿型氧化物La0.4Sr0.6Co0.8Mn0.2O3与α-MnO2的比例为2:3时,催化活性最好。
Claims (1)
1.一种α-MnO2/La0.4Sr0.6Co0.8Mn0.2O3复合催化剂的制备和性能研究的方法,其特征在于具体步骤:
(1)通过溶胶-凝胶法制备催化剂,用一定比例的金属硝酸盐,加入一定量的一水合柠檬酸进行加热搅拌混合,形成溶胶后通过干燥箱转变成凝胶,在一定的温度下煅烧就可得到钙钛矿型氧化物La0.4Sr0.6Co0.8Mn0.2O3;
(2)将称量好的0.225g KMnO4固体加入到20mL去离子水中溶解,再加入37%HCl溶液0.5mL,搅拌30min后将所得混合物倒进25mL高压釜中,随后将其放进140℃的干燥箱内12h,将所得产物取出并用无水乙醇和去离子水洗涤数次,最后将产物在60℃下干燥24h得到MnO2;
(3)将La0.4Sr0.6Co0.8Mn0.2O3与α-MnO2按比例1:4,2:3,3:2,4:1,1:0混合,得到α-MnO2改性的钙钛矿型氧化物La0.4Sr0.6Co0.8Mn0.2O3。
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