电催化剂
分解水
析氧
材料科学
可逆氢电极
化学工程
催化作用
甲醇
电化学
过电位
无机化学
电解质
塔菲尔方程
纳米晶
纳米技术
电极
化学
工作电极
物理化学
有机化学
工程类
光催化
作者
Chen Deng,Kuang‐Hsu Wu,Jason Scott,Shenmin Zhu,Xiaofeng Zheng,Rose Amal,Da‐Wei Wang
标识
DOI:10.1021/acsami.8b20565
摘要
Future renewable energy conversion requires advanced electrocatalysis technologies for hydrogen production, fuel cells, and metal–air batteries. Highly efficient trifunctional nonprecious electrocatalysts are a critical precious metal replacement for the economically viable electrocatalysis of oxygen reduction and water splitting, both of which are a triphase electrode process. Electrocatalysts with a refined porous structure and active composition beneficial for three-phase reactions are broadly pursued. Herein, a highly promising trifunctional spherical Murray assembly of Co–N–C nanoparticles was derived from low-cost Prussian blue analogues for the oxygen reduction reaction and water splitting. The Murray-type architecture with a tunable porous hierarchy for efficient mass transfer and the combination of a Co–N–C active composition are key for the improved electrocatalytic performance. Acid-leaching produced an optimized Murray-type durable and methanol-tolerant Co–N–C electrocatalyst that achieved an onset potential of 0.94 V [vs reversible hydrogen electrode (RHE)] and a half wave potential of 0.84 V (vs RHE) as well as a large diffusion-limited current density of 5.7 mA cm–2 for the oxygen reduction reaction, which is comparable to Pt/C. In addition, it displayed low onset overpotentials of ∼150 and ∼350 mV corresponding to the hydrogen evolution reaction and oxygen evolution reaction, respectively, highlighting its great potential to be used in overall water splitting with a total splitting voltage of 1.73 V. This work highlights the importance of Murray-type electrocatalysts for multiphase energy-related reactions.
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