G. M. Quindoza, Y. Nakagawa, H. L. Mizuno, Y. Anraku, R. Espiritu and T. Ikoma. Site preference and local structural stability

        of Bi(III) substitution in hydroxyapatite using first principles simulations. Physical Chemistry Chemical Physics.
        DOI: 10.1039/d4cp00864b

J. Zhang, Q. Ling, Q. Wang, C. Xu, H. Wei and R. Espiritu. A quaternized poly(aryl piperidinium)/quaternary MXene-based

                    three-layer membrane for alkaline anion exchange membrane fuel cells. International Journal of Hydrogen Energy

                    56, 1-6, 2024. DOI: 10.1016/j.ijhydene.2023.11.299

D. Gutierrez, E. Caldona, Z. Yang, X. Suo, X. Cheng, S. Dai, R. Espiritu and R. Advincula. PDMS-silica composite gas

                    separation membranes by direct ink writing. Journal of Applied Polymer Science 140(33), e54277, 2023. 

                    DOI: 10.1002/app.54277

L. Wang, Z. Fang, J. Zhang, C. Xu, R. Espiritu and J. Cheng. High-performance FeCo/NC-Mo₂TiC₂/carbon nanotube hybrid

                    support catalyst towards oxygen reduction for alkaline anion exchange membrane fuel cell. ACS Sustainable

                    Chemistry & Engineering 10(48), 15735-15740, 2022. DOI: 10.1021/acssuschemeng.2c04119

D. Gutierrez, E. Caldona, Z. Yang, X. Suo, X. Cheng, S. Dai, R. Espiritu and R. Advincula. 3D-printed PDMS-based membranes

                    for CO₂ separation applications. MRS Communications 12(6), 1174-1182, 2022. DOI: 10.1557/s43579-022-00287-1

A. J. Samaniego and R. Espiritu. Prospects on utilization of biopolymer materials for ion exchange membranes in fuel cells.   
                   Green Chemistry Letters and Reviews 15, 251-273, 2022. DOI: 10.1080/17518253.2022.2040599 (Open Access)

J. M. A. Abeleda Jr. and R. Espiritu. The status and prospects of hydrogen and fuel cell technology in the Philippines.
                    Energy Policy 162, 112781, 2022. DOI: 10.1016/j.enpol.2022.112781 (Open Access)

D. Gutierrez, E. Caldona, R. Espiritu and R. Advincula. The potential of additively manufactured membranes for selective

                    separation and capture of CO₂. MRS Communications 11(4), 391-401, 2021. DOI: 10.1557/s43579-021-00062-8

A. J. Samaniego, A. K. Arabelo, M. Sarker, F. Mojica, J. Madrid, P. A. Chuang, J. Ocon and R. Espiritu. Fabrication of cellulose

        acetate-based radiation grafted anion exchange membranes for fuel cell application. Journal of Applied Polymer

        Science 138(10), e49947, 2021. DOI: 10.1002/app.49947

R. Espiritu, J. L. Tan, L. H. Lim and S. Arco. Density functional theory study on the degradation of anion exchange membranes
                    via removal of vinylbenzyl quaternary ammonium head group. Journal of Physical Organic Chemistry 33(5),
                    e4049, 2020. DOI: 10.1002/poc.4049

R. Espiritu, and A. Amorsolo Jr. Fabrication and characterisation of Cu-Zn-Sn shape memory alloy via an electrodeposition-
                    annealing route. International Journal of Minerals, Metallurgy and Materials 26(11), 1436-1449, 2019.
                    DOI: 10.1007/s12613-019-1886-6

R. Espiritu, B. Golding, K. Scott and M. Mamlouk. Degradation of radiation grafted anion exchange membranes tethered with
                    different amine functional groups via removal of vinylbenzyl trimethylammonium hydroxide. Journal of Power
                    Sources 375, 373-386, 2018. DOI: 10.1016/j.jpowsour.2017.07.074 (Open Access)

R. Espiritu, B. Golding, K. Scott and M. Mamlouk. Degradation of radiation grafted hydroxide anion exchange membrane
                    immersed in neutral pH: removal of vinylbenzyl trimethylammonium hydroxide due to oxidation. Journal of 
                    Materials Chemistry A 5(3), 1248-1267, 2017. DOI: 10.1039/c6ta08232g (Open Access)

R. Espiritu, M. Mamlouk, and K. Scott. Study on the effect of the degree of grafting on the performance of polyethylene-based
                    anion exchange membrane for fuel cell application. International Journal of Hydrogen Energy 41(2), 1120-1133,
                    2016. DOI: 10.1016/j.ijhydene.2015.10.108 (Open Access)

K. Scott, M. Mamlouk, R. Espiritu and X. Wu. Progress in alkaline membrane fuel cells and regenerative fuel cells.
                    ECS Transactions 58(1), 1903-1906, 2013. DOI: 10.1149/05801.1903ecst

R. Espiritu and A. Amorsolo Jr. DSC analysis of Cu–Zn–Sn shape memory alloy fabricated via electrodeposition route.
                    Journal of Thermal Analysis and Calorimetry 107(2), 483-487, 2012. DOI: 10.1007/s10973-011-1465-1

R. Espiritu and A. Amorsolo Jr. SEM-EDX analysis of intermetallic phases in a Cu-Zn-Sn shape memory alloy. Microscopy
                    and Analysis 24(6), 15-17, 2010. [Link]

R. Espiritu, R. Navarro and E. Del Rosario. Development of membranes from bacterial cellulose (Nata de Coco) for the
                   separation of copper (II) ions using polyelectrolyte-enhanced ultrafiltration. Philippine Agricultural Scientist 87(1),
                   87-95, 2004. [Link]