Amorphous Cobalt Boride (Co<sub>2</sub>B) as a Highly Efficient Nonprecious Catalyst for Electrochemical Water Splitting: Oxygen and Hydrogen Evolution

Masa, Justus; Weide, Philipp; Peeters, Daniel; Sinev, Ilya; Xia, Wei; Sun, Zhenyu; Somsen, Christoph; Mühler, Martin; Schuhmann, Wolfgang

doi:10.1002/aenm.201600980

Cited by 187 publications

(225 citation statements)

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“…The obtained operation voltage of the Au–Rh‐aerogel‐based electrolyzer is also smaller than for most previously reported electrocatalysts in alkaline medium (1.51–1.81 V). [ 35–38 ] This efficient electrochemical water splitting process can also be evidenced from the vigorously generated bubbles from both the cathode (hydrogen evolution) and the anode (oxygen evolution) (Figure 3e). Afterward, the stability of the water splitting device was characterized by chronopotentiometric tests over a 10 h continuous operation.…”

Section: Resultsmentioning

confidence: 89%

Engineering Multimetallic Aerogels for pH‐Universal HER and ORR Electrocatalysis

Jin

Hübner

et al. 2020

Advanced Energy Materials

100

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The advent of noble metal aerogels (NMAs), that feature the high catalytic activity of noble metals and unique structural attributes of aerogels, has stimulated research on a new class of outstanding electrocatalysts. However, limited by the available compositions, the explored electrocatalytic reactions on NMAs are highly restricted and certain important electrochemical processes have not been investigated. Here, an effective gelation approach is demonstrated by using a strong salting‐out agent (i.e., NH4F), thereby expanding the composition of NMAs to various multimetallic systems and providing a platform to investigate composition‐dependent electrocatalytic performance of NMAs. Combining structural features of aerogels and optimized chemical compositions, the Au–Pt and Au–Rh aerogel catalysts manifest remarkable pH‐universal (pH = 0–14) performance surpassing commercial Pt/C and many other nanoparticle (NP)‐based catalysts in the electrocatalytic oxygen reduction reaction, hydrogen evolution reaction, and water splitting, displaying enormous potential for the electrochemical hydrogen production, fuel cells, etc.

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Section: Resultsmentioning

confidence: 89%

Engineering Multimetallic Aerogels for pH‐Universal HER and ORR Electrocatalysis

Jin

Hübner

et al. 2020

Advanced Energy Materials

100

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“…Later, the groups of Hu and Patel reported development of Mo boride and Co boride, respectively, for electrocatalytic water splitting. Following these reports, transition‐metal borides/borates were developed using various techniques and were used extensively for water‐splitting reactions, in different pH solutions. Here, we would like to inform the readers that usually boron‐based catalysts that are developed in situ using electrodeposition are referred to as “borates” (denoted as M–B i , M = metal) while those catalysts prepared by any other technique are referred to as “borides” (denoted as M–B).…”

Section: Introductionmentioning

confidence: 99%

Metal Boride‐Based Catalysts for Electrochemical Water‐Splitting: A Review

Gupta

Patel

Miotello

et al. 2019

Adv Funct Materials

322

243

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Electrocatalytic water-splitting has gained a firm hold in the area of renewable hydrogen production owing to its integrative compatibility with intermittent energy sources. However, wide-scale implementation of this technology demands discovery of new electrode materials that strike a good balance between efficiency, stability, and cost. In the pool of inexpensive electrodes capable of catalyzing hydrogen and oxygen evolution reactions, metal borides/ borates have made a big splash in the last decade. However, the research in this family of electrocatalysts remains unorganized owing to the diversity of reports. This review summarizes the past and present research progress in metal borides/borates for electrocatalytic water-splitting. The fundamental reasons for electrochemical behavior in different metal borides/borates are highlighted here, also including some comments regarding erroneous practices in the performance evaluation of metal borides/borates. Various strategies used to enhance the electrocatalytic performance of metal borides/borates are discussed in detail. Different methods evolved over the years for the synthesis of metal borides/ borates are also discussed. Finally, an assessment of the commercial viability of metal borides/borates is made and future research directions are suggested. multimetal oxides, [18,19] layered double hydroxides, [20] oxyhydroxides, [21] and perovskites. [13,18] In addition to these, there has been the family of transition-metal borides/borates that have garnered enormous interest in the recent past. Though transition-metal borides (TMBs) have been used for water electrolysis since many decades, they were not really seen as potential candidates to replace noble metal catalysts, until recently. Indeed, in 2009, the group of Daniel Nocera reported in situ formed Co [22] and Ni [23] borates as analogous catalysts to Co phosphate, [24] for near-neutral water-splitting. Later, the groups of Hu [25] and Patel [26] reported development of Mo boride and Co boride, respectively, for electrocatalytic water splitting. Following these reports, transition-metal borides/ borates [27][28][29][30][31][32] were developed using various techniques and were used extensively for water-splitting reactions, in different pH solutions. Here, we would like to inform the readers that usually boron-based catalysts that are developed in situ using electrodeposition are referred to as "borates" (denoted as M-B i , M = metal) while those catalysts prepared by any other technique are referred to as "borides" (denoted as M-B). Over the past 5-6 years, a lot of studies have been carried out on borides/borates with remarkable results, presenting new possibilities in search for non-noble electrocatalysts. The electrochemical performance, stability and other important properties of all the metal borides reported so far are enlisted in Table 1 while that of metal borates are listed in Table 2. However, there are a lot of aspects that are not yet understood completely about borides/borates. For instance, the o...

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“…Therefore, it is highly imperative to develop the high‐efficiency, robust, and low‐cost electrocatalysts as substitute for noble‐metal electrocatalysts (Pt and Ru/IrO 2 ) to accelerate the water splitting process and reduce the overpotential of the reactions. Based on this, considerable efforts are taken to prepare bifunctional electrocatalysts for catalyzing the oxygen evolution reaction (OER) and hydrogen evolution reaction (HER) simultaneously, including sulfides,4 selenides,5 phosphates,6 and borides,7 although their catalytic activity is not yet competitive enough. In addition, the origins of the activity of these bifunctional electrocatalysts are still unclear.…”

Section: Introductionmentioning

confidence: 99%

Electronic Redistribution: Construction and Modulation of Interface Engineering on CoP for Enhancing Overall Water Splitting

Yang

Ruiming

Jiao

2020

Adv Funct Materials

270

151

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Modulating and constructing interface engineering is an efficient strategy to enhance catalytic activity for water splitting. Herein, a hybrid nanoarray structure of V‐CoP@a‐CeO2, where “a” represents amorphous, integrated into carbon cloth is fabricated for water splitting. The synergy effect between V and CeO2 can increase the electron density of Co atoms at active sites, further optimizing the Gibbs free energy of H* adsorption energy (ΔGH*). Besides, V‐CoP@a‐CeO2 possesses lower water adsorption/dissociation energies, enabling accelerated reaction kinetics in alkaline media. As expected, the V‐CoP@a‐CeO2 exhibits superior performance toward the hydrogen evolution reaction and the oxygen evolution reaction. More importantly, a two‐electrode electrolyzer combined with an electrocatalyst of V‐CoP@ a‐CeO2 only demands that voltages of electrolytic cell are 1.56 and 1.71 V to achieve the current densities of 10 and 100 mA cm−2, respectively. This work provides guidance for the design or optimization of materials for water electrolysis and beyond.

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Amorphous Cobalt Boride (Co₂B) as a Highly Efficient Nonprecious Catalyst for Electrochemical Water Splitting: Oxygen and Hydrogen Evolution

Abstract: There is an error in the reference list in the PDF version of the originally published article. References [8] and [9] were inadvertently merged during production and are both incorrectly contained within reference [8]. These references are correct as follows:[8] Y.

Cited by 187 publications

References 1 publication

Engineering Multimetallic Aerogels for pH‐Universal HER and ORR Electrocatalysis

Engineering Multimetallic Aerogels for pH‐Universal HER and ORR Electrocatalysis

Metal Boride‐Based Catalysts for Electrochemical Water‐Splitting: A Review

Electronic Redistribution: Construction and Modulation of Interface Engineering on CoP for Enhancing Overall Water Splitting

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Amorphous Cobalt Boride (Co2B) as a Highly Efficient Nonprecious Catalyst for Electrochemical Water Splitting: Oxygen and Hydrogen Evolution

Abstract: There is an error in the reference list in the PDF version of the originally published article. References [8] and [9] were inadvertently merged during production and are both incorrectly contained within reference [8]. These references are correct as follows:[8] Y.

Cited by 187 publications

References 1 publication

Engineering Multimetallic Aerogels for pH‐Universal HER and ORR Electrocatalysis

Engineering Multimetallic Aerogels for pH‐Universal HER and ORR Electrocatalysis

Metal Boride‐Based Catalysts for Electrochemical Water‐Splitting: A Review

Electronic Redistribution: Construction and Modulation of Interface Engineering on CoP for Enhancing Overall Water Splitting

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Product

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Amorphous Cobalt Boride (Co₂B) as a Highly Efficient Nonprecious Catalyst for Electrochemical Water Splitting: Oxygen and Hydrogen Evolution