Preparation and electrochemical properties of B/N co-doped porous carbon nanosheets

doi:10.16085/j.issn.1000-6613.2019-1991

Abstract

Abstract:

We report a facile method for preparing the B/N co-doped 2D porous carbon nanosheets (BNH-X) via annealing the mixtures of ammonium humate and H₃BO₃ at 700℃ (BNHC-700) and 800℃(BNHC-800), respectively. The BNH-X possess high contents of nitrogen (6.04% and 6.01%), boron (3.97% and 4.18%) and oxygen (17.01% and 16.87%), as well as developed pore structure with high mesopore ratio (36.15% and 40.84%). Expectedly, BNHC-700 and BNHC-800 showed large specific capacitances of 114F/g and 118F/g at 0.05A/g, respectively, and BNHC-800 demonstrated superior rate capability with a capacitance retention of 75.21% at 5A/g. Moreover, BNHC-700 and BNHC-800 exhibited excellent cycle performance with high capacitance retentions of 99.84% and 98.57% after 10000 cycles at 2.5A/g.

Key words: ammonium humate, orthoboric acid, B/N co-doped 2D porous carbon nanosheet, electrode material, electrochemistry, stability

摘要：

以煤系腐殖酸铵为前体，硼酸为多功能助剂，在700℃和800℃下一步炭化成功制备了B/N共掺杂多孔碳纳米片，并考察了其用作超级电容器电极材料的电化学性能。结果表明，该B/N共掺杂多孔碳纳米片具有发达的孔结构和较高的中孔率（36.15%和40.84%），富含氮（6.04%和6.01%）、硼（3.97%和4.18%）、氧（17.01%和16.87%）等杂原子，赋予相应电极材料较好的导电性、良好的润湿性和快速的离子扩散性能。BNHC-700和BNHC-800在0.05A/g电流密度下的比电容分别为114F/g和118F/g，后者还具有优异的倍率性能（5A/g下的比电容保持率高达75.21%）。BNHC-700和BNHC-800的循环稳定性良好，在2.5A/g电流密度下10000次恒流充放电后的比电容保持率分别高达99.84%和98.57%。

关键词: 腐殖酸铵, 硼酸, B/N共掺杂多孔碳纳米片, 电极材料, 电化学, 稳定性

CLC Number:

TB383.1

MA Ailing, HUANG Guangxu, GENG Qianhao, YAO Youheng, LI Yuanyuan, LIU Yingbin. Preparation and electrochemical properties of B/N co-doped porous carbon nanosheets[J]. Chemical Industry and Engineering Progress, 2021, 40(8): 4388-4396.

马爱玲, 黄光许, 耿乾浩, 姚友恒, 李媛媛, 刘迎宾. 硼/氮共掺杂多孔碳纳米片的制备及其电化学性能[J]. 化工进展, 2021, 40(8): 4388-4396.

Figures/Tables 5

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样品编号	比表面积 /m²·g^-1	总孔容 /cm³·g^-1	微孔孔容 /cm³·g^-1	中孔孔容 /cm³·g^-1	中孔率 /%	平均孔径 /nm	表面杂原子含量（XPS原子含量）/%
样品编号	比表面积 /m²·g^-1	总孔容 /cm³·g^-1	微孔孔容 /cm³·g^-1	中孔孔容 /cm³·g^-1	中孔率 /%	平均孔径 /nm	C	N	B	O
BNHC-700	384	0.2130	0.136	0.077	36.15	2.22	72.97	6.04	3.97	17.01
BNHC-800	283	0.1741	0.103	0.0711	40.84	2.46	72.94	6.01	4.18	16.87
NHC-800	69	0.0165	0	0.0165	100.0	7.23	82.94	4.21	0	12.85

样品编号	比表面积 /m²·g^-1	总孔容 /cm³·g^-1	微孔孔容 /cm³·g^-1	中孔孔容 /cm³·g^-1	中孔率 /%	平均孔径 /nm	表面杂原子含量（XPS原子含量）/%
样品编号	比表面积 /m²·g^-1	总孔容 /cm³·g^-1	微孔孔容 /cm³·g^-1	中孔孔容 /cm³·g^-1	中孔率 /%	平均孔径 /nm	C	N	B	O
BNHC-700	384	0.2130	0.136	0.077	36.15	2.22	72.97	6.04	3.97	17.01
BNHC-800	283	0.1741	0.103	0.0711	40.84	2.46	72.94	6.01	4.18	16.87
NHC-800	69	0.0165	0	0.0165	100.0	7.23	82.94	4.21	0	12.85

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