From scheelite BaMoO4 to perovskite BaMoO3: Enhanced electrocatalysis toward the hydrogen evolution in alkaline media
The discovery of new, inexpensive, and efficient electrocatalysts for the hydrogen evolution reaction (HER) in alkaline solutions holds key to the realization of clean hydrogen production through water electrolysis. While molybdenum (Mo)-based inorganic compounds have been extensively investigated a...
| Main Authors: | , , , , , |
|---|---|
| Format: | Journal Article |
| Language: | English |
| Published: |
ELSEVIER SCI LTD
2020
|
| Subjects: | |
| Online Access: | http://purl.org/au-research/grants/arc/DP150104365 http://hdl.handle.net/20.500.11937/91958 |
| _version_ | 1848765605596889088 |
|---|---|
| author | Xu, Xiaomin Pan, Y. Zhong, Yijun Ge, L. Jiang, S.P. Shao, Zongping |
| author_facet | Xu, Xiaomin Pan, Y. Zhong, Yijun Ge, L. Jiang, S.P. Shao, Zongping |
| author_sort | Xu, Xiaomin |
| building | Curtin Institutional Repository |
| collection | Online Access |
| description | The discovery of new, inexpensive, and efficient electrocatalysts for the hydrogen evolution reaction (HER) in alkaline solutions holds key to the realization of clean hydrogen production through water electrolysis. While molybdenum (Mo)-based inorganic compounds have been extensively investigated as catalyst candidates toward the alkaline HER, Mo-based oxides, in particular, complex oxides, are rarely explored. Here we report a Mo-containing, metallic BaMoO3 perovskite, which is derived from a scheelite-type, insulating BaMoO4 oxide through a thermal reduction-induced phase transformation, as a potential electrocatalyst for driving the alkaline HER. The BaMoO3 perovskite made of interconnected MoO6 octahedra is found to be more HER-active than the BaMoO4 scheelite consisting of isolated MoO4 tetrahedra, showing a significant increase in intrinsic activity by about one order of magnitude, which is due to the stabilized Mo tetravalent state, the increased surface oxygen vacancy concentration, and the improved electrical conductivity of BaMoO3. Importantly, BaMoO3 exhibits a smaller overpotential to deliver a geometric current density of −10 mA cmgeo−2 when compared with many of the bulk-sized perovskite catalysts comprising other transition metals (e.g., Mn, Fe, Co, and Ni) and the intensively studied Mo-based catalysts (e.g., MoS2), making it highly promising as an alternative electrocatalyst for the alkaline HER. |
| first_indexed | 2025-11-14T11:37:55Z |
| format | Journal Article |
| id | curtin-20.500.11937-91958 |
| institution | Curtin University Malaysia |
| institution_category | Local University |
| language | English |
| last_indexed | 2025-11-14T11:37:55Z |
| publishDate | 2020 |
| publisher | ELSEVIER SCI LTD |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | curtin-20.500.11937-919582023-06-08T06:17:36Z From scheelite BaMoO4 to perovskite BaMoO3: Enhanced electrocatalysis toward the hydrogen evolution in alkaline media Xu, Xiaomin Pan, Y. Zhong, Yijun Ge, L. Jiang, S.P. Shao, Zongping Science & Technology Technology Engineering, Multidisciplinary Materials Science, Composites Engineering Materials Science Hydrogen evolution reaction Metallic BaMoO3 Perovskite Phase transformation Scheelite Water splitting ACTIVE EDGE SITES MOS2 OXIDATION CATALYSTS OXIDE CONDUCTIVITY DIFFRACTION BEHAVIOR SR The discovery of new, inexpensive, and efficient electrocatalysts for the hydrogen evolution reaction (HER) in alkaline solutions holds key to the realization of clean hydrogen production through water electrolysis. While molybdenum (Mo)-based inorganic compounds have been extensively investigated as catalyst candidates toward the alkaline HER, Mo-based oxides, in particular, complex oxides, are rarely explored. Here we report a Mo-containing, metallic BaMoO3 perovskite, which is derived from a scheelite-type, insulating BaMoO4 oxide through a thermal reduction-induced phase transformation, as a potential electrocatalyst for driving the alkaline HER. The BaMoO3 perovskite made of interconnected MoO6 octahedra is found to be more HER-active than the BaMoO4 scheelite consisting of isolated MoO4 tetrahedra, showing a significant increase in intrinsic activity by about one order of magnitude, which is due to the stabilized Mo tetravalent state, the increased surface oxygen vacancy concentration, and the improved electrical conductivity of BaMoO3. Importantly, BaMoO3 exhibits a smaller overpotential to deliver a geometric current density of −10 mA cmgeo−2 when compared with many of the bulk-sized perovskite catalysts comprising other transition metals (e.g., Mn, Fe, Co, and Ni) and the intensively studied Mo-based catalysts (e.g., MoS2), making it highly promising as an alternative electrocatalyst for the alkaline HER. 2020 Journal Article http://hdl.handle.net/20.500.11937/91958 10.1016/j.compositesb.2020.108214 English http://purl.org/au-research/grants/arc/DP150104365 http://purl.org/au-research/grants/arc/DP160104835 http://purl.org/au-research/grants/arc/LE120100026 http://purl.org/au-research/grants/arc/LE0775551 ELSEVIER SCI LTD restricted |
| spellingShingle | Science & Technology Technology Engineering, Multidisciplinary Materials Science, Composites Engineering Materials Science Hydrogen evolution reaction Metallic BaMoO3 Perovskite Phase transformation Scheelite Water splitting ACTIVE EDGE SITES MOS2 OXIDATION CATALYSTS OXIDE CONDUCTIVITY DIFFRACTION BEHAVIOR SR Xu, Xiaomin Pan, Y. Zhong, Yijun Ge, L. Jiang, S.P. Shao, Zongping From scheelite BaMoO4 to perovskite BaMoO3: Enhanced electrocatalysis toward the hydrogen evolution in alkaline media |
| title | From scheelite BaMoO4 to perovskite BaMoO3: Enhanced electrocatalysis toward the hydrogen evolution in alkaline media |
| title_full | From scheelite BaMoO4 to perovskite BaMoO3: Enhanced electrocatalysis toward the hydrogen evolution in alkaline media |
| title_fullStr | From scheelite BaMoO4 to perovskite BaMoO3: Enhanced electrocatalysis toward the hydrogen evolution in alkaline media |
| title_full_unstemmed | From scheelite BaMoO4 to perovskite BaMoO3: Enhanced electrocatalysis toward the hydrogen evolution in alkaline media |
| title_short | From scheelite BaMoO4 to perovskite BaMoO3: Enhanced electrocatalysis toward the hydrogen evolution in alkaline media |
| title_sort | from scheelite bamoo4 to perovskite bamoo3: enhanced electrocatalysis toward the hydrogen evolution in alkaline media |
| topic | Science & Technology Technology Engineering, Multidisciplinary Materials Science, Composites Engineering Materials Science Hydrogen evolution reaction Metallic BaMoO3 Perovskite Phase transformation Scheelite Water splitting ACTIVE EDGE SITES MOS2 OXIDATION CATALYSTS OXIDE CONDUCTIVITY DIFFRACTION BEHAVIOR SR |
| url | http://purl.org/au-research/grants/arc/DP150104365 http://purl.org/au-research/grants/arc/DP150104365 http://purl.org/au-research/grants/arc/DP150104365 http://purl.org/au-research/grants/arc/DP150104365 http://hdl.handle.net/20.500.11937/91958 |