MoOxSy/Ni3S2 Microspheres on Ni Foam as Highly Efficient, Durable Electrocatalysts for Hydrogen Evolution Reaction
MoOxSy/Ni3S2 Microspheres on Ni Foam as Highly Efficient, Durable Electrocatalysts for Hydrogen Evolution Reaction
复制标题
泡沫镍上的 MoOxSy/Ni3S2 微球作为析氢反应的高效、耐用电催化剂
DOI:
10.1021/acs.chemmater.1c03682
复制
发表时间:
2022-01
影响因子:
8.6
通讯作者:
Mercouri G. Kanatzidis
中科院分区:
文献类型:
--
作者:
Zihuan Yu;Huiqin Yao;Yan Yang;Mengwei Yuan;Cheng Li;Haiying He;Ting-Shan Chan;Dongpeng Yan;Shulan Ma;Peter Zapol;Mercouri G. Kanatzidis
Hydrogen energy derived from water splitting is the cleanest renewable energy source, but it is also very challenging to achieve because the hydrogen evolution reaction (HER) requires highly efficient and low-cost electrocatalysts. We have fabricated a novel hierarchical system of amorphous molybdenum oxy/sulfide microspheres with crystalline Ni3S2intergrown in situ on Ni foam (MoOxSy/Ni3S2/NF) as an outstanding electrocatalyst for HER. The MoOxSy/Ni3S2/NF demonstrates an ultra-low overpotential of 58 mV at a current density of 10 mA cm–2and extremely durable stability (>200 h), suggesting superior performance comparable to that of Pt-C/NF under acidic conditions. The X-ray absorption fine structure (XAFS) determines the average valence state of Mo to be +(5 + δ), with a coordination motif by O and S. To explain such high HER activity, a [Mo2O2(S,O)4] dimer-based periodic model structure with the average composition of [Mo4O8S4] interfaced with the Ni3S2(101) surface is proposed. The interactions between the Ni of Ni3S2and bridging S/O of [Mo4O8S4] result in an average formal Mo charge state between +5 and +6, and significant charge transfer from Ni3S2to [Mo4O8S4] activates the Mo═O bonds. The calculated |ΔGH*| of less than 50 meV suggests that the double-bonded O is the most active site. This work points to the importance of oxy/sulfides with Mon+(+5 <n<+6) as exceptional electrochemical catalysts for HER.
登录
查看更多内容
影响因子:
3.3
作者:
Zhang Bo;Fu Xiuli;Song Li;Wu Xiaojun
通讯作者:
Wu Xiaojun
影响因子:
41.2
作者:
Tran PD;Tran TV;Orio M;Torelli S;Truong QD;Nayuki K;Sasaki Y;Chiam SY;Yi R;Honma I;Barber J;Artero V
通讯作者:
Artero V
影响因子:
15
作者:
Li, Yanguang;Wang, Hailiang;Dai, Hongjie
通讯作者:
Dai, Hongjie
影响因子:
15
作者:
Hinnemann, B;Moses, PG;Norskov, JK
通讯作者:
Norskov, JK
影响因子:
9.5
作者:
Kien-Cuong Pham;Chang, Yung-Huang;Chua, Daniel H. C.
通讯作者:
Chua, Daniel H. C.