磷化物
过电位
电催化剂
三元运算
过渡金属
电解质
材料科学
金属
密度泛函理论
费米能级
氢
无机化学
化学
催化作用
物理化学
电化学
计算化学
电极
冶金
有机化学
电子
物理
程序设计语言
量子力学
计算机科学
作者
Seongyoung Kong,Prashant Singh,Georgiy Akopov,Dapeng Jing,Ryan C. Davis,Jorge E. Perez-Aguilar,Jiang Hong,Shannon Lee,Gayatri Viswanathan,Ernesto Soto,Muhammad Azhan,Tiago Fernandes,Stasia Harycki,Alexander Gundlach‐Graham,Yury V. Kolen’ko,Duane D. Johnson,Kirill Kovnir
标识
DOI:10.1021/acs.chemmater.3c00460
摘要
Transition-metal phosphides (TMP) have been identified as promising electrocatalysts for the hydrogen evolution reaction (HER). Despite recent computational investigations identifying P sites as being crucial for hydrogen adsorption, the main mode of optimization for TMPs has been focused on changing the metal sites. To experimentally verify computational hypotheses and provide a route for HER electrocatalyst optimization via ternary compounds, we performed systematic experimental studies of structurally related NiSi1–xPx phases, namely, Ni2SiP, Ni5Si2P3, Ni3SiP2, and Ni7Si2P5, which are ordered derivatives of the NiSi structure (Pnma, oP-8, MnP structure type). We found that P played a significant role in modulating HER activity in an acidic electrolyte because the incorporation of P in NiSi reduced the overpotential at current density j = 10 mA/cm2 from η10 = 529 mV (NiSi) to η10 = 97 mV (Ni2SiP). Ni2SiP outperformed the current state-of-the-art Ni5P4 electrocatalyst prepared and studied in identical conditions both in terms of activity and stability, which is attributed to the presence of covalent Ni–Si bonding in the structure. Within the family of ternary Ni–Si–P compounds, electrocatalytic activity correlates with the number of Ni-3d states at the Fermi energy.
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