[1] Z Li, Y Wu, J Zhang et al. RSC Adv, 9, 408(2019).

[2] C Shang, M Tian. J. Hydrogen Energy, 44, 338(2019).

[3] M Hu, X Xie, M Chen et al. Int. J. Hydrogen Energy, 44, 10694(2019).

[4] M Ismail, N Ali, N Mustafa et al. Int. J. Hydrogen Energy, 44, 318(2019).

[5] H Shang, Y Zhang, Y Li et al. Int. J. Hydrogen Energy, 43, 6642(2018).

[6] M Calizzi, L Jepsen, D Chericoni et al. Int. J. Hydrogen Energy, 41, 14447(2016).

[7] K Alsabawi, C J Webb, Gray E MacA. Int. J. Hydrogen Energy, 44, 2976(2019).

[8] M Jangir, A Jain, S Yamaguchi et al. Int. J. Hydrogen Energy, 41, 14178(2016).

[9] G Zhang, Y Li et al. J. Solid State Chem, 264, 148(2018).

[10] G Zhang, Z Hou, J Xu et al. J. Rare Earths, 35, 63(2017).

[11] M Rodrigues, E Longo, A Catto et al. J. Rare Earths, 36, 1074(2018).

[12] M Pai, A Athawale, A Bokare. Solar Energy, 91, 111(2013).

[13] F Meng, F Lu, L Wang et al. Micro & Nano Lett, 7, 624(2012).

[14] L Li, Y Wu, Y Xing et al. ACS Energy Lett, 4, 2601(2019).