Effect of nano-NiO synthesized by sol-gel combustion on the microstructures and thermal properties of solar salt

doi:10.19799/j.cnki.2095-4239.2020.0125

Abstract

Abstract:

Enhancing the specific heat capacity of solar salt can significantly improve its heat storage capacity, which is a central issue in the field of high-temperature energy storage in the recent years. This study synthesizes the NiO nanoparticles in situ in solar salt through the sol-gel combustion method to obtain modified solar salt. The effects of nano-NiO on the solar salt microstructures and properties are investigated by X-ray diffraction, scanning electron microscopy, transmission electron microscopy, energy-dispersive X-ray spectroscopy, and differential scanning calorimetry. The results show that spherical NiO particles with 8—10 nm diameter are successfully prepared and can be agglomerated into small clusters measuring 0.1—0.5 μm. The NiO nanoparticles synthesized in situ by the sol-gel combustion method can markedly enhance the specific heat capacity of solar salt. The increase of the interfacial energy and the semi-solid layer formation are the main reasons for the enhanced specific heat capacity of the modified solar salt.

Key words: nano-NiO, solar salt, specific heat capacity, sol-gel combustion method

CLC Number:

TM 615

Pei DAI, Xiaomin CHENG, Yuanyuan LI. Effect of nano-NiO synthesized by sol-gel combustion on the microstructures and thermal properties of solar salt[J]. Energy Storage Science and Technology, 2020, 9(6): 1760-1767.

Figures/Tables 14

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样品	柠檬酸∶硝酸镍摩尔比(C∶N)	点燃温度/℃	溶液pH	纳米颗粒含量/%
TP-1/3	1∶3	400	3	1
TP-1/2	1∶2	400	3	1
TP-1/1	1∶1	400	3	1
MP-300	1∶2	300	3	1
MP-500	1∶2	500	3	1
MP-600	1∶2	600	3	1
MT-1	1∶2	400	1	1
MT-5	1∶2	400	5	1
TP-1/2-10	1∶2	400	3	10

样品	Cp/J·(g·℃)^-1
	固态比热容与变化					液态比热容与变化
	第一次	第二次	第三次	平均值	增长	第一次	第二次	第三次	平均值	增长
基盐	1.42	1.42	1.41	1.42	-	1.37	1.36	1.36	1.36	-
TP-1/3	2.02	2.10	2.08	2.07	45.8%	1.72	1.72	1.73	1.72	26.5%
TP-1/2	2.59	2.56	2.60	2.58	81.7%	2.13	2.14	2.14	2.14	57.4%
TP-1/1	2.26	2.28	2.20	2.25	58.5%	1.98	1.96	1.97	1.97	44.9%
MP-300	1.38	1.36	1.36	1.37	-3.5%	1.16	1.16	1.08	1.13	-16.9%
MP-500	1.89	1.88	1.90	1.89	33.1%	1.67	1.69	1.63	1.66	22.1%
MP-600	1.53	1.55	1.60	1.56	9.9%	1.32	1.30	1.31	1.31	-3.7%
MT-1	1.58	1.57	1.58	1.58	11.3%	1.37	1.39	1.32	1.36	0
MT-5	2.01	2.03	2.01	2.02	42.3%	1.34	1.30	1.41	1.35	-0.7%

样品	相变潜热/J·g^-1	初始相变温度/℃	相变结束温度/℃
基盐	107.9	220.5	229.6
TP-1/3	95.2	219.0	237.3
TP-1/2	139.4	207.3	226.0
TP-1/1	104.4	211.5	227.6
MP-300	108.7	210.2	225.8
MP-500	84.3	203.3	221.1
MP-600	111.8	210.1	226.2
MT-1	93.9	208.3	226.0
MT-5	107.0	217.5	229.4

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