Manzoor Bhat, Zahid Manzoor; Thimmappa, Ravikumar; Dargily, Neethu Christudas ; Raafik, Abdul ; Kottaichamy, Alagar Raja ; Devendrachari, Mruthyunjayachari Chattanahalli ; Itagi, Mahesh; Makri Nimbegondi Kotresh, Harish; Freunberger, Stefan AlexanderIST Austria ; Ottakam Thotiyl, Musthafa
“Hydrogen economy” could enable a carbon-neutral sustainable energy chain. However, issues with safety, storage, and transport of molecular hydrogen impede its realization. Alcohols as liquid H2 carriers could be enablers, but state-of-the-art reforming is difficult, requiring high temperatures >200 °C and pressures >25 bar, and the resulting H2 is carbonized beyond tolerance levels for direct use in fuel cells. Here, we demonstrate ambient temperature and pressure alcohol reforming in a fuel cell (ARFC) with a simultaneous electrical power output. The alcohol is oxidized at the alkaline anode, where the resulting CO2 is sequestrated as carbonate. Carbon-free H2 is liberated at the acidic cathode. The neutralization energy between the alkaline anode and the acidic cathode drives the process, particularly the unusually high entropy gain (1.27-fold ΔH). The significantly positive temperature coefficient of the resulting electromotive force allows us to harvest a large fraction of the output energy from the surrounding, achieving a thermodynamic efficiency as high as 2.27. MoS2 as the cathode catalyst allows alcohol reforming even under open-air conditions, a challenge that state-of-the-art alcohol reforming failed to overcome. We further show reforming of a wide range of alcohols. The ARFC offers an unprecedented route toward hydrogen economy as CO2 is simultaneously captured and pure H2 produced at mild conditions.
ACS Sustainable Chemistry and Engineering
M.O.T. acknowledges DST/TMD/HFC/2 K18/58, DST-SERB, MHRD fast track, and DST Nanomission forfinancialassistance. Z.M.B. acknowledges CSIR-SRF fellowship fromMHRD, India. S.A.F. acknowledges support from IST Austria.
Manzoor Bhat ZM, Thimmappa R, Dargily NC, et al. Ambient condition alcohol reforming to hydrogen with electricity output. ACS Sustainable Chemistry and Engineering. 2021;9(8):3104-3111. doi:10.1021/acssuschemeng.0c07547
Manzoor Bhat, Z. M., Thimmappa, R., Dargily, N. C., Raafik, A., Kottaichamy, A. R., Devendrachari, M. C., … Ottakam Thotiyl, M. (2021). Ambient condition alcohol reforming to hydrogen with electricity output. ACS Sustainable Chemistry and Engineering. American Chemical Society. https://doi.org/10.1021/acssuschemeng.0c07547
Manzoor Bhat, Zahid Manzoor, Ravikumar Thimmappa, Neethu Christudas Dargily, Abdul Raafik, Alagar Raja Kottaichamy, Mruthyunjayachari Chattanahalli Devendrachari, Mahesh Itagi, Harish Makri Nimbegondi Kotresh, Stefan Alexander Freunberger, and Musthafa Ottakam Thotiyl. “Ambient Condition Alcohol Reforming to Hydrogen with Electricity Output.” ACS Sustainable Chemistry and Engineering. American Chemical Society, 2021. https://doi.org/10.1021/acssuschemeng.0c07547.
Z. M. Manzoor Bhat et al., “Ambient condition alcohol reforming to hydrogen with electricity output,” ACS Sustainable Chemistry and Engineering, vol. 9, no. 8. American Chemical Society, pp. 3104–3111, 2021.
Manzoor Bhat ZM, Thimmappa R, Dargily NC, Raafik A, Kottaichamy AR, Devendrachari MC, Itagi M, Makri Nimbegondi Kotresh H, Freunberger SA, Ottakam Thotiyl M. 2021. Ambient condition alcohol reforming to hydrogen with electricity output. ACS Sustainable Chemistry and Engineering. 9(8), 3104–3111.
Manzoor Bhat, Zahid Manzoor, et al. “Ambient Condition Alcohol Reforming to Hydrogen with Electricity Output.” ACS Sustainable Chemistry and Engineering, vol. 9, no. 8, American Chemical Society, 2021, pp. 3104–11, doi:10.1021/acssuschemeng.0c07547.