Co-Mo-B Nanoparticles as a non-precious and efficient Bifunctional Electrocatalyst for Hydrogen and Oxygen Evolution

Gupta, Suraj; Patel, N.; Fernandes, R.; Hanchate, S.; Miotello, A.; Kothari, D.C.

doi:10.1016/j.electacta.2017.02.100

Cited by 115 publications

(85 citation statements)

References 41 publications

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“…By donating electrons, B may play a sacrificial role to prevent the oxidation of the metal sites and improve their stability. A number of reports on amorphous Co and Ni based borides agree well with this reverse electron transfer phenomenon being responsible for higher HER rate …”

Section: Origin Of Electrochemical Activity In Metal Boridessupporting

confidence: 55%

“…Recently, Mullins and co‐workers presented an excellent analysis of the degree of oxidation in metal chalcogenides, pnictides, and carbides during OER and summarized the various theories for their electrochemical activity. In case of metal borides as well, OER proceeds in a similar fashion by forming surface oxide/hydroxide species . Operando X‐ray absorption spectroscopy (XAS) studies on Ni x B showed that during OER, Ni–B core remains intact while the surface oxidation state changes from Ni 2+ to Ni 3+ ( Figure a,b), thus giving direct evidence of the formation of surface NiOOH layer.…”

Section: Origin Of Electrochemical Activity In Metal Boridesmentioning

confidence: 96%

“…The electrocatalytic performance of mono‐metal borides improve drastically after incorporation of a second element (examples discussed later) . While most reports just summarize the performance chart, only few of them tried to understand the role of these secondary elements in improving the HER rates.…”

Section: Origin Of Electrochemical Activity In Metal Boridesmentioning

confidence: 99%

“…This creates opportunity for transfer of more number of electrons from B to Co and hence improves the HER rate. Inclusion of Mo in Co–B, on the other hand, leads to formation of smaller sized particles, creating more number of active sites for HER. There are other ternary catalysts formed by inclusion of phosphorous (P) in the metal boride (e.g., Co–P–B, Ni–P–B, Fe–P–B, etc.).…”

Section: Origin Of Electrochemical Activity In Metal Boridesmentioning

confidence: 99%

See 3 more Smart Citations

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

Gupta

Patel

Miotello

et al. 2019

Adv Funct Materials

335

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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Section: Origin Of Electrochemical Activity In Metal Boridessupporting

confidence: 55%

Section: Origin Of Electrochemical Activity In Metal Boridesmentioning

confidence: 96%

Section: Origin Of Electrochemical Activity In Metal Boridesmentioning

confidence: 99%

Section: Origin Of Electrochemical Activity In Metal Boridesmentioning

confidence: 99%

See 2 more Smart Citations

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

Gupta

Patel

Miotello

et al. 2019

Adv Funct Materials

335

243

View full text Add to dashboard Cite

show abstract

“…Furthermore, incorporating a second metal into the metal oxide catalysts has been proposed as an efficient strategy to modulate the charge distribution and energy level, due to their synergistic effects [25,26]. For example, it has been reported that multi-metallic electrocatalysts such as Co-Ni-B-O nanosheets [27], CoNiP x [28], CoMoS [29], CoMoB [30] and CoFe layered double hydroxides [31] exhibit distinctly improved catalytic activity for the OER process, compared with their mono-metallic counterparts.…”

Section: Introductionmentioning

confidence: 99%

Bimetallic oxide coupled with B-doped graphene as highly efficient electrocatalyst for oxygen evolution reaction

Jiang

Dong

et al. 2020

Sci. China Mater.

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Developing electrocatalysts with high performance and low cost for the oxygen evolution reaction (OER) is of great importance for fabricating renewable energy storage and conversion devices. Here, a series of boron-doped graphene (BG)-supported bimetallic oxides of Co and Ni were obtained and served as OER electrocatalysts. Surprisingly, the annealed Co-Ni-O x /BG with a Co/Ni ratio of 1:1 exhibits high performance toward oxygen evolution in alkaline electrolyte. The overpotential is only 310 mV at the current density of 10 mA cm −2 , superior to many mono-metallic oxides reported before, and even comparable to the commercial RuO 2 . The regulation of charge distribution in bimetallic oxides and the strong synergistic coupling effects together contribute to the superior electrocatalytic performance of the Co-Ni-O x /BG toward OER. This study also offers several effective ways to design high-performance OER electrocatalysts for water splitting.

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Higher Water‐Splitting Performance of Boron‐Based Porous CoMnB Electrocatalyst over the Benchmarks at High Current in 1 m KOH and Real Sea Water

Lin

Habib

Mandavkar

et al. 2022

Advanced Sustainable Systems

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emission nature, the hydrogen is receiving significant attentions as a renewable energy alternative. [2,3] The electrocatalytic water splitting, consisted of the half-reaction of hydrogen evolution reaction (HER) and oxygen evolution reaction (OER), is an appealing approach for the generation of ultra-fine hydrogen with the zero-carbon emission nature and recyclability as compared with the other hydrogen generation approaches of gasification, gas reforming, renewable liquid reforming, etc. [4] To date, the Pt/Pd and IrO 2 /RuO 2 set the benchmark electrocatalysts for the HER and OER with the low overpotentials due to their excellent water-splitting capabilities. Nevertheless, their high costs make the large-scale implementation of hydrogen generation pricier and thus the development of highly efficient and stable electrocatalysts at affordable costs still remains to be one of the major challenges for the comprehensive application of green hydrogen production by the electrochemical water splitting (WS). The transition metal-based electrocatalysts with the d-orbital characteristics, i.e., Co, Ni, Cu, Fe, Mo, W, Mn, Cr, etc., have been widely explored as the electrolytic electrode alternatives with the superb HER and OER reaction capabilities and abundance on the earth crust. [5][6][7][8] The transition metals have been frequently compounded with the nonmetallic phosphide, sulfide, nitride, etc., and significant advances have been made along with the outstanding WS performances due to their superb intrinsic HER/OER reaction capabilities. [9][10][11][12] Meantime, the Co and Mn have demonstrated outstanding electron transportability and absorption of hydrogen protons and hydroxyl species. [9][10][11][12] For instance, the CoNi-MOF exhibited a low overpotential due the rapid electron transfer rate facilitated by the adequate Co incorporation. [9] The Mn-doped Ni 2 P microflowers demonstrated a low cell voltage due to the improved conductivity and increased electrochemical active sites by the incorporation of Mn. [10] The combination of Co and Mn with the nonmetallic elements of methylidyne and selenide groups such as CoMnCH and CoMnSe has demonstrated improved intrinsic characteristics for the WS. [11,12] More recently, the boron (B) is being considered as another useful nonmetallic element for The development of highly efficient and stable electrocatalysts at an affordable cost is an essential component for the large-scale implementation of green hydrogen production. In this work, the fabrication of porous CoMnB electrocatalyst is demonstrated with the incorporation of boron into the Co-Mn matrix by an electrochemical approach for bifunctional water electrocatalysis for the first time. The optimized CoMnB electrocatalyst demonstrates an excellent bifunctionality with a low 2-E turnover voltage of 1.59 V at 20 mA cm −2 in 1 m KOH. The CoMnB shows a comparable water-splitting current at low current range as compared with the standard benchmark electrodes of Pt/C||RuO 2 in 1 m KOH. Then, the CoMnB outperforms the benchm...

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Co-Mo-B Nanoparticles as a non-precious and efficient Bifunctional Electrocatalyst for Hydrogen and Oxygen Evolution

Cited by 115 publications

References 41 publications

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

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

Bimetallic oxide coupled with B-doped graphene as highly efficient electrocatalyst for oxygen evolution reaction

Higher Water‐Splitting Performance of Boron‐Based Porous CoMnB Electrocatalyst over the Benchmarks at High Current in 1 m KOH and Real Sea Water

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