Study of the electrooxidation of borohydride on a directly formed CoB/Ni-foam electrode and its application in membraneless direct borohydride fuel cells

Guo, Siqi; Sun, Jie; Zhang, Zhengyan; Sheng, Aokai; Gao, Ming; Wang, Zhibin; Zhao, Bin; Ding, Weiping

doi:10.1039/c7ta03464d

Cited by 44 publications

(24 citation statements)

References 40 publications

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“…[ 30 ] The binding energy of B in 0 valent state is higher than the previously reported results which suggest the electronic interaction between Co and B. [ 31 ] Additionally, the strong C 1s peak was observed in the survey scan which most probably came from the urea used in the synthesis of the thin film. Three peaks were observed after deconvolution of C 1s spectrum, that is, 284.85, 286.15, and 288.58 eV correspond to CC/CC, CO, and CO, respectively (Figure S14, Supporting Information).…”

Section: Resultsmentioning

confidence: 96%

“…It is noticed that the B 1s spectra exhibit another peak near 191 eV could be ascribed to B +3 which indicates the presence of boron oxo species as observed in other metal boride catalysts (Figure 4c). [ 31 ] The continuous performance of Gd‐CoB and the resistance of the Gd and Co surface against chemical transformation demonstrate that the boride layer not only increases the mechanical stability but also helps out chemical stability during OER. Inductively coupled plasma optical emission spectroscopy measurement was also recorded for KOH electrolyte after 20 h continuous electrolysis.…”

Section: Electrochemical Activitymentioning

confidence: 99%

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Gold‐Supported Gadolinium Doped CoB Amorphous Sheet: A New Benchmark Electrocatalyst for Water Oxidation with High Turnover Frequency

Haq

Mansour

Munir

et al. 2020

Adv Funct Materials

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Electrochemical water splitting has been considered a promising approach for green and sustainable hydrogen as a future energy carrier. However, the lack of high performance and inexpensive electrocatalysts for kinetically sluggish oxygen evolution reaction (OER) hinder the practical application. Here, the noteworthy enhancement of electrodeposited cobalt boride (CoB) nanosheets from the combined effect of using gadolinium as a dopant and thin film of gold as prudent support is demonstrated. The free-standing Gd-CoB@Au exhibits remarkable electrochemical performance, high intrinsic activity, and lower reaction resistance, which are confirmed by lower onset potential, small charge transfer resistance, lower Tafel slope value, and high turnover frequency. Furthermore, the post-OER characterization signpost, no observable change in the chemical structure or morphology of nanosheets during the long-lasting oxidation process. Because of the inexpensive, facile, and scalable one-step preparation processes, the catalyst is highly encouraging for large-scale practical applications.in pursuing toward viable electrochemical water splitting module. [1] The HER follows a relatively simple mechanism and various cost-effective and efficient metal/ alloy-based catalysts have been developed to produce hydrogen at fairly low overpotential. [2] A serious challenge, however, is the slow rate of multistep OER, which requires high activation energy and thus large overpotential to break OH bond, and to form an OO bond and transfer 04 electrons essentially required for oxygen evolution from two water molecules at the same time. [3] The slow rate of OER in turn adversely affects the overall rate of water splitting for hydrogen production. [4] It is, therefore, essentially required to develop stable, economical, and effective electrocatalysts for OER for the feasible production of H 2 by water splitting. Currently, IrO 2 and RuO 2 are the benchmark OER catalysts to significantly improve slow kinetics of oxygen evolution at the anode. These electrocatalysts are made up of expensive precious metals, and their supply is not sustainable and is, therefore, not much suitable for large-scale applications in water oxidation systems. [5] Besides precious metals, several costeffective nanoscale materials including layer double hydroxides, perovskite, amorphous/crystalline metal hydroxides have been extensively explored for OER. [6][7][8] Hence, it is well established, that nano-structuring is one of the widely adopted strategies to enhance the catalytic properties and selectivity, toward the OER for practical application. [9] However, low mass loading of catalyst, mechanical and chemical instability, less exposed surface area, reproducibility, potentially induced phase/electronic transformation during catalysis, surface leaching of the catalyst due to the low adhesion of catalyst are still serious concerns that need to be addressed. [10] Also, the use of powder nanomaterials traditionally needs various binders (Nafion/polymers) for the fabricati...

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Section: Resultsmentioning

confidence: 96%

Section: Electrochemical Activitymentioning

confidence: 99%

Gold‐Supported Gadolinium Doped CoB Amorphous Sheet: A New Benchmark Electrocatalyst for Water Oxidation with High Turnover Frequency

Haq

Mansour

Munir

et al. 2020

Adv Funct Materials

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“…The Co/Ni‐foam and CoSn x /Ni‐foam electrodes were prepared by the chemical reduction method with sodium borohydride (NaBH 4 ) as reductant agent. In order to get good adhesion and uniformity, the Ni‐foam was sensitized by Ag . Briefly, the Ni‐foam was immersed in 0.4 wt.% AgNO 3 solution in dark place for 24 h, then washed by deionized water and dried.…”

Section: Methodsmentioning

confidence: 99%

“…The reason accounted for this contradiction is that when the catalysts improve the catalytic activity to BOR, the hydrolysis rate under the action of catalyst increased at the same time. For instance, in Zhao's report, a maximum power density of 230 mW cm −2 at 330 K was obtained using CoB anode material , but research shows that Co‐B series catalyst in alkaline solution is also good catalysts for catalytic BH 4 − hydrolysis for hydrogen production . Zhou investigated PdNi x ‐B/CNTs as DBFCs‐PFM anode catalysts, showing the maximum power density of 110 mW cm −2 while the fuel efficiency (41%) is the lowest among all PdNi x ‐B/CNTs catalysts.…”

Section: Introductionmentioning

confidence: 99%

Promoting Effect of Tin on Binder‐Free CoSn_x‐B/Ni‐foam Catalysts for Fuel Conversion Efficiency in Direct Borohydride Fuel Cell

Gao

et al. 2019

Fuel Cells

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The anodic activity of anodic catalyst for borohydride oxidation reaction (BOR) and inhibiting the borohydride hydrolysis reaction (BHR) are crucial to development for direct borohydride fuel cells (DBFC). In this paper, binder free CoSnx‐B/Ni‐foam (x = 0, 0.33, 0.5, 1) anode catalysts for BOR were prepared by chemical reduction method. It is found that the tin (Sn) is favor for improving the catalytic activity of cobalt (Co) for BOR, meanwhile, the catalytic activity is in relation to Co/Sn atom ratios. A maximum power density of 158 mW cm−2 of DBFC anodic catalytic is achieved at 293 K using CoSn0.33‐B/Ni‐foam which is 1.58 times that of Co‐B/Ni‐foam (100 mW cm−2). The constant discharge test of DBFCs showed that the specific capacity or fuel conversion efficiency decrease with the catalytic activity increasing. However, for the same electrocatalyst, the fuel conversion efficiency increased with the discharge current grown, indicating that there is a BHR which was independent of electrocatalyst in the discharge process. The results showed that CoSnx‐B/Ni‐foam had superior activity for BOR, suggesting their potential application as anodes in DBFC.

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“…1 However, currently the fuel supply is still one of the biggest hindrances for worldwide application of mobile fuel cell technologies. 2,3 Hydrogen supply via hydrolysis of sodium borohydride (NaBH 4 ) 4 or direct borohydride fuel cells (DBFCs) both have great potential as possible solutions. 5 However, both of these technologies suffer from the high cost of NaBH 4 as well as difficulties in the regeneration of the spent fuel.…”

Section: Introductionmentioning

confidence: 99%

Realizing facile regeneration of spent NaBH₄ with Mg–Al alloy

et al. 2019

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Study of the electrooxidation of borohydride on a directly formed CoB/Ni-foam electrode and its application in membraneless direct borohydride fuel cells

Abstract: CoB/Ni-foam was directly formed on a Ni-foam substrate using the electroless plating method. A membraneless DBFC with CoB/Ni-foam (7EP) as an anode showed a maximum power density of 230 mW cm−2.

Cited by 44 publications

References 40 publications

Gold‐Supported Gadolinium Doped CoB Amorphous Sheet: A New Benchmark Electrocatalyst for Water Oxidation with High Turnover Frequency

Gold‐Supported Gadolinium Doped CoB Amorphous Sheet: A New Benchmark Electrocatalyst for Water Oxidation with High Turnover Frequency

Promoting Effect of Tin on Binder‐Free CoSn_x‐B/Ni‐foam Catalysts for Fuel Conversion Efficiency in Direct Borohydride Fuel Cell

Realizing facile regeneration of spent NaBH₄ with Mg–Al alloy

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Study of the electrooxidation of borohydride on a directly formed CoB/Ni-foam electrode and its application in membraneless direct borohydride fuel cells

Abstract: CoB/Ni-foam was directly formed on a Ni-foam substrate using the electroless plating method. A membraneless DBFC with CoB/Ni-foam (7EP) as an anode showed a maximum power density of 230 mW cm−2.

Cited by 44 publications

References 40 publications

Gold‐Supported Gadolinium Doped CoB Amorphous Sheet: A New Benchmark Electrocatalyst for Water Oxidation with High Turnover Frequency

Gold‐Supported Gadolinium Doped CoB Amorphous Sheet: A New Benchmark Electrocatalyst for Water Oxidation with High Turnover Frequency

Promoting Effect of Tin on Binder‐Free CoSnx‐B/Ni‐foam Catalysts for Fuel Conversion Efficiency in Direct Borohydride Fuel Cell

Realizing facile regeneration of spent NaBH4 with Mg–Al alloy

Contact Info

Product

Resources

About

Promoting Effect of Tin on Binder‐Free CoSn_x‐B/Ni‐foam Catalysts for Fuel Conversion Efficiency in Direct Borohydride Fuel Cell

Realizing facile regeneration of spent NaBH₄ with Mg–Al alloy