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Large‐Size, Porous, Ultrathin NiCoP Nanosheets for Efficient Electro/Photocatalytic Water Splitting
Author(s) -
Lv Xinding,
Li Xitao,
Yang Chen,
Ding Xiaoqing,
Zhang Yifan,
Zheng YanZhen,
Li Siqi,
Sun Xiangnan,
Tao Xia
Publication year - 2020
Publication title -
advanced functional materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 6.069
H-Index - 322
eISSN - 1616-3028
pISSN - 1616-301X
DOI - 10.1002/adfm.201910830
Subject(s) - materials science , photocatalysis , bimetallic strip , water splitting , phosphide , oxide , chemical engineering , graphene , catalysis , oxygen evolution , porosity , nanotechnology , bifunctional , electrochemistry , electrode , composite material , metal , metallurgy , chemistry , organic chemistry , engineering
Porous ultrathin 2D catalysts are attracting great attention in the field of electro/photocatalytic hydrogen evolution reaction (HER) and overall water splitting. Herein, a universal pH‐controlled wet‐chemical strategy is reported followed by thermal and phosphorization treatment to prepare large‐size, porous and ultrathin bimetallic phosphide (NiCoP) nanosheets, in which graphene oxide is adopted as a template to determine the size of products. The thickness of the resultant NiCoP nanosheets ranges from 3.5 to 12.8 nm via delicately adjusting pH from 7.8 to 8.5. The thickness‐dependent electrocatalytic performance is evidenced experimentally and explained by computational studies. The prepared large‐size ultrathin NiCoP nanosheets show excellent bifunctional electrocatalytic activity for overall water splitting, with low overpotentials of 34.3 mV for HER and 245.0 mV for oxygen evolution reaction, respectively, at 10 mA cm −2 . Furthermore, the NiCoP nanosheets exhibit superior photocatalytic HER performance, achieving a high HER rate of 238.2 mmol h −1 g −1 in combination with commonly used photocatalyst CdS, which is far superior to that of Pt/CdS (81.7 mmol h −1 g −1 ). All these results demonstrate large‐size porous ultrathin NiCoP nanosheets as an efficient and multifunctional electro/photocatalyst for water splitting.