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Synthesis of a Highly Efficient Oxygen‐Evolution Electrocatalyst by Incorporation of Iron into Nanoscale Cobalt Borides
ChemSusChem ( IF 8.4 ) Pub Date : 2018-08-19 , DOI: 10.1002/cssc.201801547 Sebastian Klemenz 1 , Jona Schuch 2 , Stefan Hawel 2 , Anne-Marie Zieschang 1 , Bernhard Kaiser 2 , Wolfram Jaegermann 2 , Barbara Albert 1
ChemSusChem ( IF 8.4 ) Pub Date : 2018-08-19 , DOI: 10.1002/cssc.201801547 Sebastian Klemenz 1 , Jona Schuch 2 , Stefan Hawel 2 , Anne-Marie Zieschang 1 , Bernhard Kaiser 2 , Wolfram Jaegermann 2 , Barbara Albert 1
Affiliation
High‐performance catalysts for the oxygen‐evolution reaction in water electrolysis are usually based on expensive and rare elements. Herein, mixed‐metal borides are shown to be competitive with established electrocatalysts like noble metal oxides and other transition‐metal(oxide)‐based catalysts. Iron incorporation into nanoscale dicobalt boride results in excellent activity and stability in alkaline solutions. (Co0.7Fe0.3)2B shows an overpotential of η=0.33 V (1.56 V vs. RHE) at 10 mA cm−2 in 1 m KOH with a very low onset potential of ≈1.5 V vs. RHE, comparable to the performance of IrO2 and RuO2. XPS shows that the original catalyst is modified under the reaction conditions and indicates that CoOOH and Co(OH)2 are formed as active surface species, whereas the Fe remains in the catalyst, contributing to an improved catalyst performance. The nanoscale borides are obtained by a one‐step solution synthesis, calcined, and characterized by XRD, energy‐dispersive X‐ray spectroscopy, and SEM. Single crystals of (Co1−xFex)2B grown under chemical transport conditions were used for an unambiguous specification of the nanostructured particles by relating the cobalt/iron ratio to the lattice parameters.
中文翻译:
通过将铁掺入纳米级钴硼化物中合成高效氧演化电催化剂
用于水电解中氧气释放反应的高性能催化剂通常基于昂贵且稀有的元素。在此,混合金属硼化物已显示出与已建立的电催化剂(如贵金属氧化物和其他过渡金属(氧化物)基催化剂)竞争。将铁掺入纳米级二钴硼化物可在碱性溶液中产生出色的活性和稳定性。(Co 0.7 Fe 0.3)2 B在1 m KOH中在10 mA cm -2时 表现出η = 0.33 V(1.56 V vs. RHE)的超电势,与RHE相比≈0.15 V vs. RHE的启动电位非常低。 IrO 2和RuO 2的性能。XPS表明原始催化剂在反应条件下被改性,并表明形成CoOOH和Co(OH)2作为活性表面物质,而Fe保留在催化剂中,有助于改善催化剂性能。纳米级硼化物通过一步溶液合成,煅烧并通过XRD,能量色散X射线光谱和SEM进行表征。通过将钴/铁比与晶格参数相关联,将在化学传输条件下生长的(Co 1- x Fe x)2 B单晶用于纳米结构颗粒的明确规格。
更新日期:2018-08-19
中文翻译:
通过将铁掺入纳米级钴硼化物中合成高效氧演化电催化剂
用于水电解中氧气释放反应的高性能催化剂通常基于昂贵且稀有的元素。在此,混合金属硼化物已显示出与已建立的电催化剂(如贵金属氧化物和其他过渡金属(氧化物)基催化剂)竞争。将铁掺入纳米级二钴硼化物可在碱性溶液中产生出色的活性和稳定性。(Co 0.7 Fe 0.3)2 B在1 m KOH中在10 mA cm -2时 表现出η = 0.33 V(1.56 V vs. RHE)的超电势,与RHE相比≈0.15 V vs. RHE的启动电位非常低。 IrO 2和RuO 2的性能。XPS表明原始催化剂在反应条件下被改性,并表明形成CoOOH和Co(OH)2作为活性表面物质,而Fe保留在催化剂中,有助于改善催化剂性能。纳米级硼化物通过一步溶液合成,煅烧并通过XRD,能量色散X射线光谱和SEM进行表征。通过将钴/铁比与晶格参数相关联,将在化学传输条件下生长的(Co 1- x Fe x)2 B单晶用于纳米结构颗粒的明确规格。