Preparation of LNP-based hierarchical porous carbon and its electrochemical properties

doi:10.16085/j.issn.1000-6613.2021-1567

Abstract

Abstract:

Based on green deep eutectic solvent (DES), wheat straw biomass fractionations were efficiently isolated to prepare lignin nanoparticles (LNP). LNP-based carbon (LNPC) with hierarchical porous microstructure was prepared by chemical activation and further pyrolysis and carbonization. The influences of Zn-activators and pyrolysis temperatures (600℃, 700℃, 800℃) on the structural properties and electrochemical performances of LNPC were studied by means of SEM, Raman, BET analyzers, etc. The results proved that the activated LNPC with Zn-activators exhibited better dispersibility and more hierarchical porous morphology compared with LNPC from direct pyrolysis consisted of massive carbon nanoparticles aggregation. In particular, LNPC-ZnCO₃-800 possessed outstanding performances on better graphitization (I_D/I_G=0.68), higher BET specific surface area (679m²/g), more mesoporous pores (86.7%) and uniform carbon nanoparticles. Moreover, LNPC-ZnCO₃-800 had a high specific capacitance of 179F/g at a current density of 0.5A/g, which was 180% higher than that of LNPC-800 (64F/g).

Key words: lignin nanoparticles, activation, pyrolysis, porous carbon, electrochemical

摘要：

基于绿色低共熔溶剂（DES）高效分离麦草生物质组分以制备纳米木质素（LNP），本文采用化学活化法并进一步热解炭化制备纳米木质素基多孔炭（LNPC）。借助SEM、Raman、BET-物理吸附等分析手段研究了锌系活化剂及热解炭化温度（600℃、700℃、800℃）对LNPC的结构特征及电化学性能的影响。研究结果表明，相对于LNP直接热解炭化后纳米碳粒子的极易团聚，经锌化物活化后所制备的LNPC表现出更好的分散性和多级孔道形貌结构。尤其，以ZnCO₃活化后制备的LNPC-ZnCO₃-800具有更突出的性能，较高石墨化程度（I_D/I_G为0.68）、较高BET比表面积（679m²/g）、高介孔率（86.7%）、均匀纳米碳粒子构成的介孔结构。此外，以LNPC-ZnCO₃-800制备的工作电极，在0.5A/g时的比电容可达179F/g，与直接热解炭化的LNPC-800（64F/g）相比，其比电容的容量提高了180%。

关键词: 纳米木质素, 活化, 热解, 多孔炭, 电化学

CLC Number:

LOU Rui, LIU Yu, TIAN Jie, ZHANG Yanan. Preparation of LNP-based hierarchical porous carbon and its electrochemical properties[J]. Chemical Industry and Engineering Progress, 2022, 41(6): 3170-3177.

娄瑞, 刘钰, 田杰, 张亚男. 纳米木质素基多孔炭的制备及其电化学性能[J]. 化工进展, 2022, 41(6): 3170-3177.

Figures/Tables 6

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样品	600℃	700℃	800℃
LNPC	43.06	42.80	41.64
LNPC-ZnCO₃	42.67	42.07	31.45
LNPC-Zn(OH)₂	49.90	39.82	23.71
LNPC-ZnCl₂	63.20	59.42	41.45

样品	600℃	700℃	800℃
LNPC	43.06	42.80	41.64
LNPC-ZnCO₃	42.67	42.07	31.45
LNPC-Zn(OH)₂	49.90	39.82	23.71
LNPC-ZnCl₂	63.20	59.42	41.45

样品	S_BET/m²·g^-1	V_total/cm³·g^-1	V_meso/cm³·g^-1	R_meso/%
LNPC-ZnCO₃-600	553	1.14	1.01	88.6
LNPC-ZnCO₃-700	651	1.34	1.16	86.6
LNPC-ZnCO₃-800	697	1.35	1.17	86.7
LNPC-ZnCl₂-800	741	0.38	0.08	21.1
LNPC-Zn(OH)₂-800	412	0.69	0.55	79.9
LNPC-800	156	0.075	0.002	2.7

样品	S_BET/m²·g^-1	V_total/cm³·g^-1	V_meso/cm³·g^-1	R_meso/%
LNPC-ZnCO₃-600	553	1.14	1.01	88.6
LNPC-ZnCO₃-700	651	1.34	1.16	86.6
LNPC-ZnCO₃-800	697	1.35	1.17	86.7
LNPC-ZnCl₂-800	741	0.38	0.08	21.1
LNPC-Zn(OH)₂-800	412	0.69	0.55	79.9
LNPC-800	156	0.075	0.002	2.7

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