LiCoO2-based catalysts for generation of hydrogen gas from sodium borohydride solutions

Today there is a consensus regarding the potential of NaBH4 as a good candidate for hydrogen storage and release via hydrolysis reaction, especially for mobile, portable and niche applications. However as gone through in the present paper two main issues, which are the most investigated throughout the open literature, still avoid NaBH4 to be competitive. The first one is water handling. The second one is the catalytic material used to accelerate the hydrolysis reaction. Both issues are objects of great attentions as it can be noticed throughout the open literature. This review presents and discusses the various strategies which were considered until now by many studies to manage water and to improve catalysts performances (reactivity and durability). Published studies show real improvements and much more efforts might lead to significant overhangs. Nevertheless, the results show that we are still far from envisaging short‐term commercialisation.

show abstract

“…Regarding the hydrolysis of NaBH 4 , Kojima et al [26] [79,[80][81][82]. Table 4 shows the HGRs of the LiCoO 2 -based supported metals.…”

Section: Supported Metalsmentioning

confidence: 99%

Sodium Borohydride Hydrolysis as Hydrogen Generator: Issues, State of the Art and Applicability Upstream from a Fuel Cell

et al. 2010

View full text Add to dashboard Cite

show abstract

“…In the ex situ preparation common cobalt salts are reduced with a NaBH 4 solution followed by separation, washing, and drying of the black Co x B precipitate [27][28][29][30][31]. In the in situ route the active boride phase is obtained from cobalt compounds directly in the medium of NaBH 4 hydrolysis reaction [7,8,17,18]. The latter approach simplifies considerably the catalyst preparation procedure.…”

Section: Introductionmentioning

confidence: 99%

“…Catalysts containing noble metals (Pt, Rh, Ru) have shown the best performance in this process [10][11][12], but their high cost makes them prohibitive for wider applications. Cobalt-based catalysts have recently emerged to potentially replace noble metals in NaBH 4 hydrolysis [13], including Co nanoparticles [14][15][16], metallic cobalt [7,17], cobalt salts [7,8,17,18], cobalt oxides [16,[18][19][20], Co-B hollow spheres [21], and supported Cocontaining catalysts [22][23][24][25][26]. However, most of the work in this area has been devoted to cobalt boride, Co x B, either in its pure form [27][28][29][30][31] or with dopants (Ni, Fe, Cu, W, Cr, Mo, Mn, and P) [25,[32][33][34][35].…”

Section: Introductionmentioning

confidence: 99%

Cobalt borate catalysts for hydrogen production via hydrolysis of sodium borohydride

Ozerova

Симагина

Komova

et al. 2012

Journal of Alloys and Compounds

Self Cite

View full text Add to dashboard Cite

“…Today it is largely believed that cobalt borides Co z B with different stoichiometry (i.e. z varying from 1 to 3) form from various precursors that can be Co salts [3], Co oxides [22] or even metal Co [9]. For example, it has been reported the formation of CoB [23], Co 2 B [20], and Co 3 B [24] by reduction of CoCl 2 in the presence of a NaOH-stabilized solution of NaBH 4 .…”

Section: Cobalt Catalysts In Various Statesmentioning

confidence: 98%

Cobalt, a reactive metal in releasing hydrogen from sodium borohydride by hydrolysis: A short review and a research perspective

et al. 2010

View full text Add to dashboard Cite

1) According to the definition given by the U.S. Department of Energy, a gravimetric hydrogen storage capacity (GHSC) is the capacity of the storage system taken as a whole (i.e. hydride, tank, valves, pipes and so on). It is different from the gravimetric hydrogen density (HD) of a hydride as it takes into account the H content only. Hence, the HD cannot be directly compared to the GHSC.2) One might assume that the hydride weight represents about 50 % of the weight of the filled storage system.Cobalt is commonly admitted as being a promising catalyst in accelerating NaBH 4 hydrolysis, being as reactive as noble metals and much more cost-effective. This is the topic of the present paper. Herein, we survey (i) the NaBH 4 -devoted literature while especially focusing on the Co catalysts and (ii) our work on the same topic. Finally, we report (iii) reactivity results of newly developed Co-based catalysts. From both surveys, it mainly stands out that Co has been investigated as catalysts in various forms: namely, as chlorides, reduced nanoparticles (metal Co, Co boride, Co-B alloy), supported over supports and shaped. In doing so the reactivity can be easily varied achieving H 2 generation rates from few to >1000 L(H 2 )/min·g (metal). Nevertheless, our work can be distinguished from the NaBH 4 literature. Indeed, we are working on strategies that focus on making alternative Co-based catalysts. One of these strategies is illustrated here as we report new reactivity data of Co-based bimetallic supported catalysts. For example, we show that 20 wt% Co 90 Y 10 /Al 2 O 3 -20 wt% Co 95 Hf 5 /Al 2 O 3 > 20 wt% Co 99 Zr 1 /Al 2 O 3 > 20 wt% Co/Al 2 O 3 , the best catalysts showing HGRs of about 245 mL(H 2 )/min or 123 L(H 2 ) /min·g (metals). bimetallic catalyst, cobalt, heterogeneous catalysis, hydrogen, hydrolysis, sodium borohydride, sodium tetrahydroborate

show abstract

LiCoO2-based catalysts for generation of hydrogen gas from sodium borohydride solutions

Cited by 60 publications

References 18 publications

Sodium Borohydride Hydrolysis as Hydrogen Generator: Issues, State of the Art and Applicability Upstream from a Fuel Cell

Sodium Borohydride Hydrolysis as Hydrogen Generator: Issues, State of the Art and Applicability Upstream from a Fuel Cell

Cobalt borate catalysts for hydrogen production via hydrolysis of sodium borohydride

Cobalt, a reactive metal in releasing hydrogen from sodium borohydride by hydrolysis: A short review and a research perspective

Contact Info

Product

Resources

About