Black phosphorus (BP), a star‐shaped two‐dimensional material, has attracted considerable attention owing to its unique chemical and physical properties. BP shows great potential in photocatalysis area because of its excellent optical properties; however, its applications in this field have been limited to date. Now, a Z‐scheme heterojunction of 2D/2D BP/monolayer Bi2WO6 (MBWO) is fabricated by a simple and effective method. The BP/MBWO heterojunction exhibits enhanced photocatalytic performance in photocatalytic water splitting to produce H2 and NO removal to purify air; the highest H2 evolution rate of BP/MBWO is 21042 μmol g−1, is 9.15 times that of pristine MBWO and the NO removal ratio was as high as 67 %. A Z‐scheme photocatalytic mechanism is proposed based on monitoring of .O2−, .OH, NO2, and NO3− species in the reaction. This work broadens applications of BP and highlights its promise in the treatment of environmental pollution and renewable energy issues.

Phase structure control of Ni nanocrystals has been realized using a one‐pot chemical route. By adjusting the growth environment and growth dynamic process, pure cubic and hexagonal phase Ni nanocrystals can be obtained (see figure). Both the cubic and hexagonal phase Ni nanocrystals are shown to possess ferromagnetic properties, but the magnetic properties of the cubic phase are better than those of the hexagonal phase nanocrystals.

Ab uilt-in electric field in electrocatalyst can significantly accumulate higher concentration of NO 3 À ions near electrocatalyst surface region, thus facilitating mass transfer for efficient nitrate removal at ultra-lowconcentration and electroreduction reaction (NO 3 RR). Am odel electrocatalyst is created by stacking CuCl (111) and rutile TiO 2 (110) layers together,i nw hich ab uilt-in electric field induced from the electron transfer from TiO 2 to CuCl (CuCl_BEF) is successfully formed .T his built-in electric field effectively triggers interfacial accumulation of NO 3 À ions around the electrocatalyst. The electric field also raises the energy of key reaction intermediate *NO to lower the energy barrier of the rate determining step.ANH 3 product selectivity of 98.6 %, alow NO 2 À production of < 0.6 %, and mass-specific ammonia production rate of 64.4 h À1 is achieved, whicha re all the best among studies reported at 100 mg L À1 of nitrate concentration to date.

BiOBr containing surface oxygen vacancies (OVs) was prepared by a simple solvothermal method and combined with graphitic carbon nitride (g‐C3N4) to construct a heterojunction for photocatalytic oxidation of nitric oxide (NO) and reduction of carbon dioxide (CO2). The formation of the heterojunction enhanced the transfer and separation efficiency of photogenerated carriers. Furthermore, the surface OVs sufficiently exposed catalytically active sites, and enabled capture of photoexcited electrons at the surface of the catalyst. Internal recombination of photogenerated charges was also limited, which contributed to generation of more active oxygen for NO oxidation. Heterojunction and OVs worked together to form a spatial conductive network framework, which achieved 63 % NO removal, 96 % selectivity for carbonaceous products (that is, CO and CH4). The stability of the catalyst was confirmed by cycling experiments and X‐ray diffraction and transmission electron microscopy after NO removal.

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